JavaBeat » AbhilashEtikala

Spring MVC – Setter Injection Example

AbhilashEtikala — Fri, 21 Jan 2011 23:04:44 +0000

Setter Injection

Spring IOC container will inject the dependencies using the setter bean class.All the dependencies are declared as the instance variables of the bean class.Here we show a simple Book details example of Setter-Injection.

Spring Framework Articles

Spring MVC Setter Injection example

1.Modify the web.xml to configure the Dispatcher Servlet.

web.xml



    
        contextConfigLocation
        /WEB-INF/applicationContext.xml
    
    
        org.springframework.web.context.ContextLoaderListener
    
    
        dispatcher
        org.springframework.web.servlet.DispatcherServlet
        2
    
    
        dispatcher
        *.html
    
    
        
            30
        
    
    
        index.jsp

2.Create an dispatcher-servlet.xml file which contains all the configuration beans to handle the user requests.It handles the user request and dispatches to respective controllers. In this file we declare the bean called Book and we set the properties of the bean using property with corresponding name and value attributes.

Below code shows how to pass the dependancy arguments to the bean using property attribute.

dispatcher-servlet.xml

3.Create a Jsp file index.jsp to display the output.

index.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib  uri="http://www.springframework.org/tags/form" prefix="form" %>

 

    
        
        Welcome to Spring Web MVC project
    
 
 
       Spring MVC Setter Injection Example
       
           
               Book Name
               ${BookName}
           
            
               Price
               ${price}
           
            
               Author
               ${author}

4.Create a Java class file Book.java which extends AbstractController and contains three fields (bookName,price and author) which will be injected from the Spring IOC using the setter methods of the bean. Here this class acts like a controller.

Book.java

public class Book extends AbstractController {
 
    private String bookName;
    private int price;
    private String author;
 
    public Book() {
    }
 
 
    protected ModelAndView handleRequestInternal(
            HttpServletRequest request,
            HttpServletResponse response) throws Exception {
 
        ModelAndView mv=new ModelAndView();
        mv.addObject("BookName",getBookName());
        mv.addObject("price", getPrice());
        mv.addObject("author", getAuthor());
        return mv;
        //throw new UnsupportedOperationException("Not yet implemented");
    }
 
    public String getAuthor() {
        return author;
    }
 
    public void setAuthor(String author) {
        this.author = author;
    }
 
    public String getBookName() {
        return bookName;
    }
 
    public void setBookName(String bookName) {
        this.bookName = bookName;
    }
 
    public int getPrice() {
        return price;
    }
 
    public void setPrice(int price) {
        this.price = price;
    }
 
}

5.Building and running the application

Output

Access page:

http://localhost:8080/SetterInjection/index.htm

Introduction to Spring Web MVC Framework

Spring MVC – Constructor Injection Example

AbhilashEtikala — Fri, 21 Jan 2011 23:04:11 +0000

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Constructor Injection

Spring IOC will inject the dependencies using the constructor.All the dependencies are declared in the constructor.
Here we show a simple student details example of Constructor-Injection. We have already published another article on the
Spring Constructor Injection. This example
provides more details.

Spring Framework Articles

Spring MVC Constructor Injection example

1.Modify the web.xml to configure the Dispatcher Servlet.

web.xml




    
        contextConfigLocation
        /WEB-INF/applicationContext.xml
    
    
        org.springframework.web.context.ContextLoaderListener
    
    
        dispatcher
        org.springframework.web.servlet.DispatcherServlet
        2
    
    
        dispatcher
        *.html
    
    
        
            30
        
    
    
        index.jsp

2.Create an dispatcher-servlet.xml file which contains all the configuration beans to handle the user requests.It handles the user request and dispatches to respective controllers. In this file we declare the bean called Student and we pass the respective constructor-arguments using constructor-arg attribute.

Below code shows how to pass the dependancy arguments to constructor using constructor-arg attribute.

dispatcher-servlet.xml

3.Create a Jsp file index.jsp to display the output.

index.jsp


<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib  uri="http://www.springframework.org/tags/form" prefix="form" %>

 

    
        
        Welcome to Spring Web MVC project
    
 
   
Spring MVC Constructor Injection Example
        
 
        
            
                Student Name 
                ${name}
            
            
                Age 
                ${age}
            
            
                Branch 
                ${branch}

4.Create a Java class file Student.java which extends AbstractController and contains three fields (name,age and branch) which will be injected from the Spring IOC using the constructor. Here this class acts like a controller.

Student.java


public class Student extends AbstractController
 
{
 
    private String name;
    private int age;
    private String branch;
 
    public Student() {
 
    }
 
 
    public Student(String name, int age, String branch)  {
        this.name = name;
        this.age = age;
        this.branch = branch;
    }
 
    public int getAge() {
        return age;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
 
    public String getBranch() {
        return branch;
    }
 
    public void setBranch(String branch) {
        this.branch = branch;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
 
 
    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest arg0, HttpServletResponse arg1) throws Exception {
 
         ModelAndView mv=new ModelAndView();
 
        mv.addObject("name",getName());
        mv.addObject("age", getAge());
        mv.addObject("branch", getBranch());
        return mv;
 
    }
 
   }

5.Building and running the application

Output

Access page:

1
http://localhost:8080/ConstructorInjection/index.htm

Introduction to Spring Web MVC Framework

Spring MVC – DispatcherServlet Example

AbhilashEtikala — Fri, 21 Jan 2011 23:03:40 +0000

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DispatcherServlet Configuration

DispatcherServlet : In Spring’s web MVC framework the mechanism of dispatching the request to the appropriate controllers is achieved by configuring the DispatcherServlet class. DispatcherServlet is the class which manages the entire request handling process.Like a normal servlet DispatcherServlet also needs to be configured in the web deployement Descriptor(web.xml).By default DispatcherServlet will look for a name dispatcher-servlet.xml to load the Spring MVC configuration. Spring’s DispatcherServlet is completly integrated with the Spring ApplicationContext and enables to use all the other features of the Spring.This example will explain about DispatcherServlet and its configuration.

Spring Framework Articles

Spring MVC DispatcherServlet example

1.Modify the web.xml to configure the DispatcherServlet.

web.xml




    
        contextConfigLocation
        /WEB-INF/applicationContext.xml
    
    
        org.springframework.web.context.ContextLoaderListener
    
    
	
        dispatcher
 
        org.springframework.web.servlet.DispatcherServlet
        2
    
    
        dispatcher
        *.html
    
    
        
            30
        
    
    
        index.jsp

2.Create an dispatcher-servlet.xml file which contains all the configuration beans to handle the user requests.It handles the user request and dispatches to respective controllers.

The basic usage of the dispatcher-servlet.xml

Spring’s MVC Inversion of Control is configured in dispatcher-servlet.xml file.
Any dependency Injection for the beans is also configured in the dispatcher-servlet.xml like ConstructorInjection,SetterInjection,InterfaceInjection.
Spring MVC provides a feature to initialize and inject the dependencies from the dispatcher-servlet.xml
ViewResolvers are also configured in dispatcher-servlet.xml
Predefined tags supported by Spring Framework makes easier for the user to initialize the beans.

dispatcher-servlet.xml

3.Create a Jsp file index.jsp to display the output.

index.jsp


<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib  uri="http://www.springframework.org/tags/form" prefix="form" %>

 

    
        
        Welcome to Spring Web MVC project
    
 
   
Spring MVC DispatcherServlet Example
        
 
        
            
                Student Name 
                ${name}
            
            
                Age 
                ${age}
            
            
                Branch 
                ${branch}

Student.java


public class Student extends AbstractController
 
{
 
    private String name;
    private int age;
    private String branch;
 
    public Student() {
 
    }
 
 
    public Student(String name, int age, String branch)  {
        this.name = name;
        this.age = age;
        this.branch = branch;
    }
 
    public int getAge() {
        return age;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
 
    public String getBranch() {
        return branch;
    }
 
    public void setBranch(String branch) {
        this.branch = branch;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
 
 
    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest arg0, HttpServletResponse arg1) throws Exception {
 
         ModelAndView mv=new ModelAndView();
 
        mv.addObject("name",getName());
        mv.addObject("age", getAge());
        mv.addObject("branch", getBranch());
        return mv;
 
    }
 
   }

5.Building and running the application

Output

Access page:

1
http://localhost:8080/DispatcherServlet/index.htm

Spring HTML TRANSFORM Tag ()

AbhilashEtikala — Sun, 05 Dec 2010 23:03:06 +0000

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Spring Tag Library

Spring MVC provides a JSP tag library (Spring Form) for making it easier to bind form elements to Model data. Spring Framework also provides you with some tags for evaluating errors, setting themes and outputting internationalized messages.

Syntax to use Spring tag library

1	`<%@taglib uri="http://www.springframework.org/tags" prefix="spring">`

transform tag

-This tag provides support for transforming properties which is not contained by Command usign propertyEditors associated with Command. This tag can only be used inside the spring:bind tag.

Example for tags

1.Modify the web.xml to configure the Dispatcher Servlet.

web.xml




    
        contextConfigLocation
        /WEB-INF/applicationContext.xml
    
    
        org.springframework.web.context.ContextLoaderListener
    
    
        dispatcher
        org.springframework.web.servlet.DispatcherServlet
        2
    
    
        dispatcher
        *.htm
    
    
        
            30
        
    
    
        index.html

2.Create an dispatcher-servlet.xml file which contains all the configuration beans to handle the user requests.It handles the user request and dispatches to respective controllers.This file contains the countryController bean which is used to control the request.

dispatcher-servlet.xml

3.Create a Jsp file index.jsp which contains the spring tranform tag. In this example the user has to select a country from the list and click submit button.The selected country name in the list will be displayed along with “selected ” word which shows the transform tag tranforming the properties of the given object.

index.jsp


 
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags" prefix="spring" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

 

    
        
        Welcome to Spring Web MVC project
    
 
    
        Spring:transform tag example.
      Select any country and click the submit button.The selected country in the list will
      be displayed along with the word "selected" thus shows the transform tag provide support for transforming properties.
       
           
        
      Country 
          ${name}

4.Create countryController.java which extends a SimpleFormController class provides configurable form and success views.In this example we have referenceData method which returns a Map of values from the bean.These Map values are loaded into the list in the index.jsp page.

countryController.java


 
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;
 
 
public class countryController extends SimpleFormController {
 
    public countryController() {
 
    }
 
    @Override
    @SuppressWarnings("empty-statement")
    protected Map referenceData(HttpServletRequest request) throws Exception {
        country c1=new country();
        Map mp=new HashMap();
 
        ArrayList li=new ArrayList();
        li.add("India");
        li.add("USA");
        li.add("UK");
        c1.setCountry_name(li);
        mp.put("countryName",c1.getCountry_name());
 
        return mp;
    }
 
}

5.Create country.java bean to hold the country names as an ArrayList.This bean is declared in the dispatcher-servlet.xml file which makes the spring to control the bean with their respective getter and setter methods.

country.java


 
import java.util.ArrayList;
 
 
public class country {
 
    private ArrayList country_name=new ArrayList();
 
    public country() {
 
    }
 
 
 
    public ArrayList getCountry_name() {
        return country_name;
    }
 
    public void setCountry_name(ArrayList country_name) {
        this.country_name = country_name;
    }
 
 }

4.Building and running the application

Output

Access page:

1
http://localhost:8084/transform/index.html

After user selects a country and clicks submit button.

Spring HTML ESCAPE and ESCAPE BODY Tags ( and )

AbhilashEtikala — Mon, 29 Nov 2010 23:02:34 +0000

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Spring Tag Library

Read Integrating Struts With Spring

Syntax to use Spring tag library

1	<%@taglib uri="http://www.springframework.org/tags" prefix="spring">

htmlEscape and escapeBody tags

-This tag sets the default HTML escape value for the current page.The default is “false”.We can also set a “defaultHtmlEscape” web.xml context-param.A page-level setting overrides a context-param

-This tag is used to escape its enclosed body content, applying HTML escaping and/or JavaScript escaping. It is used to explicitly specify whether to apply HTMlL escaping or not. If not set, a page-level default (e.g. from the HtmlEscapeTag) or an application-wide default (the “defaultHtmlEscape” context-param in web.xml) is used.

Example for and tags

1.Modify the web.xml to configure the Dispatcher Servlet.

web.xml



    
        contextConfigLocation
        /WEB-INF/applicationContext.xml
    
    
        org.springframework.web.context.ContextLoaderListener
    
    
        dispatcher
        org.springframework.web.servlet.DispatcherServlet
        2
    
    
        dispatcher
        *.htm
    
    
        
            30
        
    
    
        index.htm

2.Create an dispatcher-servlet.xml file which contains all the configuration beans to handle the user requests.It handles the user request and dispatches to respective controllers.

dispatcher-servlet.xml



 
    
 
 
  
         
            
                indexController

3.Create a Jsp file index.jsp which contains the spring htmlEscape and escapeBody tags. In this example both tags are set with different cominations of values(“true”,”false”).

index.jsp

 
 
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags" prefix="spring"%>

 

    
        
        Welcome to Spring Web MVC project
    
 
    
 
          htmlEscape is false 
         escapeBody is false 
          
               
 
              less than < 
              greater than > 
              
          
 
 htmlEscape is false 
         escapeBody is true 
          
               
 
              less than < 
              greater than > 
              
          
 
 htmlEscape is true 
         escapeBody is false 
          
               
 
              less than < 
              greater than > 
              
          
 
 htmlEscape is true 
         escapeBody is true 
          
               
 
              less than < 
              greater than >

4.Building and running the application

Output

Access page:

1
http://localhost:8084/HtmlEscape/index.htm

Spring Framework Articles

Spring BIND and NESTEDPATH Tags ( and )

AbhilashEtikala — Mon, 29 Nov 2010 23:01:58 +0000

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Spring Tag Library

Read Integrating Struts With Spring

Syntax to use Spring tag library

1	<%@taglib uri="http://www.springframework.org/tags" prefix="spring">

Bind and NestedPath tags

-This tag provides support for the evaluation of the certain bean or bean property.The status may includes the actual value of the certain bean or bean property as well as possible errors and the expression for the databinding functionality.

-This tag provide support and assist with nested beans or bean properties.It exports a “nestedPath” variable of type String.
The BindTag will automatically detect the nested path and automatically prepend it to its own path to form a complete path to the bean or bean property.
This tag will also prepend any existing nested path that is currently set. Thus, you can nest multiple nested path tags.

Example for and tags

1.Modify the web.xml to configure the Dispatcher Servlet.

web.xml



    
        contextConfigLocation
        /WEB-INF/applicationContext.xml
    
    
        org.springframework.web.context.ContextLoaderListener
    
    
        dispatcher
        org.springframework.web.servlet.DispatcherServlet
        2
    
    
        dispatcher
        *.htm
    
    
        
            30
        
    
    
        index.htm

2.Create an dispatcher-servlet.xml file which contains all the configuration beans to handle the user requests.It handles the user request and dispatches to respective controllers.

dispatcher-servlet.xml

3.Create a Jsp file for taking input from the user nameView.jsp which contains all the form fields with Spring bind tags.Later we set the FormView as this file to accept input.

nameView.jsp

 
 
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags" prefix="spring" %>
<%@taglib  uri="http://www.springframework.org/tags/form" prefix="form" %>

 

    
        
        JSP Page
    
    
        Spring nestedpath and bind tag example
            
         Enter Your Details...
    
       Name:
        
            

        
        Country:
          
            

        
        Email:

4.Create another Jsp file helloView.jsp which is a View for Spring to display the output. In this file we use Expression Language to display the details from as the bean properties.In Spring we can set the success view page from the controller.

helloView.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@page import="java.util.Enumeration"%>

 

    
        
        JSP Page
    
   
    Spring nestedpath and bind tag example
 
    Your Details are...
    ${name}
    ${country}
    ${email}

5.Create a Java class file Name.java this bean contains the 3 private variables to store the values which are binded using bind tag.Binding is associated with setting the bean property by using respective setter methods.Using getter methods we can retrieve the values in the controller.

Name.java

public class Name {
 
     private String name;
     private String country;
     private String email;
 
    public String getCountry() {
        return country;
    }
 
    public void setCountry(String country) {
        this.country = country;
    }
 
    public String getEmail() {
        return email;
    }
 
    public void setEmail(String email) {
        this.email = email;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
}

6.Create a HelloController.java file which extends SimpleFormController to control the user request and return respective ModelAndView object. In this controller we can set the FormView,Success View and Bean as setCommand.

HelloController.java

 
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;
 
public class HelloController extends SimpleFormController {
 
    private HelloService helloService;
 
    public void setHelloService(HelloService helloService) {
        this.helloService = helloService;
    }
    public HelloController() {
 
        setCommandClass(Name.class);
        setCommandName("name");
        setSuccessView("helloView");
        setFormView("nameView");
    }
 
 
  @Override
protected ModelAndView onSubmit(Object command) throws Exception {
    Name name = (Name)command;
    ModelAndView mv = new ModelAndView(getSuccessView());
 
    mv.addObject("name", name.getName());
    mv.addObject("country",name.getCountry());
    mv.addObject("email",name.getEmail());
 
    return mv;
}
 
}

7.Building and running the application

Output

Access page:

1
http://localhost:8080/HelloSpring/index.html

Success View page is displayed with the details

Spring Framework Articles

Spring MESSAGE and THEME Tags ( and )

AbhilashEtikala — Mon, 29 Nov 2010 23:01:05 +0000

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Spring Tag Library

Read Integrating Struts With Spring

Syntax to use Spring tag library

1	<%@taglib uri="http://www.springframework.org/tags" prefix="spring">

Message and Theme tags

-This tag provides internationalization support using MessageSource interface which provides functionality to retrieve messages.If “code” isn’t set or cannot be resolved, “text” will be used as default message.

-This tag is used to retrieve a theme message in the scope of the current page.Messages are looked up using the ApplicationContext’s ThemeSource.

Example for and tags

1.Modify the web.xml to configure the Dispatcher Servlet.

web.xml



    
        contextConfigLocation
        /WEB-INF/applicationContext.xml
    
    
        org.springframework.web.context.ContextLoaderListener
    
    
        dispatcher
        org.springframework.web.servlet.DispatcherServlet
        2
    
    
        dispatcher
        *.htm
    
    
        
            30
        
    
    
        index.htm

2.Create an dispatcher-servlet.xml file which contains all the configuration beans to handle the user requests.It handles the user request and dispatches to respective controllers.

Here create two beans which are instances of ResourceBundleThemeSource and ResourceBundleMessageSource class loads the property files.

dispatcher-servlet.xml



 
    
 
 

 
	
        
		
 
  
         
            
                indexController

3.Create a Jsp file index.jsp which contains the spring message and theme tag.

index.jsp

 
 
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags" prefix="spring"%>

 

    
        
        Welcome to Spring Web MVC project
        ' type="text/css"/>
 
   
 
    
 
       Hello this is the blue theme

4.Create properties file theme.properties which contains the css file location. Here we used two keys ‘default’,'blue’ and their corresponding css files.

1 2	default=themes/default.css blue=themes/blue.css

5.Create properties file messages.properties which contains the messages with their corresponding keys. These messages are retrieved from the page using spring:message tag.

1	message.header=Welcome to Java Beat

6.Creating two Style Sheets default.css and blue.css these style sheets are located from the properties file and gets loaded to the currnet page when request is made. spring:theme tag can be used to retrieve the theme.

default.css

1
2
3

body{
    background-color:#DDDDDD;
}

blue.css

1
2
3

body{
    background-color:#3333FF;
}

7.Building and running the application

Output

Access page:

1
http://localhost:8084/SpringTheme/index.htm

Blue background style.

Spring Framework Articles

Spring Framework FORM Tags

AbhilashEtikala — Tue, 09 Nov 2010 21:45:41 +0000

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Spring FORM Tag Library

Read Integrating Struts With Spring

Syntax to use Spring Form tag library

1	<%@taglib uri="http://www.springframework.org/tags/form" prefix="form">

Form tags used in this example

-Renders an HTML 'form' tag and exposes a binding path to inner tags for binding.

-Renders an HTML 'input' tag with type 'text' using the bound value.

-Renders field errors in an HTML 'span' tag.

-Renders an HTML 'input' tag with type 'password' using the bound value.

-Renders an HTML 'input' tag with type 'radio'.

-Renders an HTML 'select' element. Supports databinding to the selected option.

-Renders a single HTML 'option'. Sets 'selected' as appropriate based on bound value.

-Renders an HTML 'textarea'.

-Renders an HTML 'input' tag with type 'checkbox'.

Simple Registration Form Example

1.Modify the web.xml to configure the Dispatcher Servlet.

web.xml



    
        contextConfigLocation
        /WEB-INF/applicationContext.xml
    
    
        org.springframework.web.context.ContextLoaderListener
    
    
        dispatcher
        org.springframework.web.servlet.DispatcherServlet
        2
    
    
        dispatcher
        *.html
    
    
        
            30
        
    
    
        index.jsp

2.Create an dispatcher-servlet.xml file which contains all the configuration beans to handle the user requests.It handles the user request and dispatches to respective controllers.

dispatcher-servlet.xml



 
    
 
 
    
      






 
 
 
 


 
false
 

 

 

index
 
success

3.Create a Jsp file for taking input from the user index.jsp which contains all the form fields with Spring Form tags.

index.jsp

 
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib  uri="http://www.springframework.org/tags/form" prefix="form" %>

 

    
        
        Welcome to Spring Web MVC project
    
 
    
        Spring Form tags Example
        
 
           User Name: 
               

           Password: 
           

           First Name: 

           Last Name: 

           Gender: Male
               Female

                   Country :
                       India
                       USA
                       Australia
                   

                   Address: 

                       Select any :
                       Check Box1
                       
                       Check Box2

4.Create another Jsp file success.jsp which is a View for Spring to display the output. In this file we use Expression Language to display the details.

success.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@page import="java.util.Enumeration"%>

 

    
        
        Spring Form Tags Example
    
    
        Spring Form tags examples
        
         User Name: ${uname}

         First Name: ${fname}

         Last Name: ${lname}

         Gender: ${gender}

         Country: ${country}

         Address: ${addr}

         Selected Check box: ${cb}

5.Create a Java class file Registration.java which contains the business logic for registration application. Here this file contains 8 private variables with their respective getter and setter methods to store the details for registration.

Registration.java

public class Registration {
 
    private String username;
    private String password;
    private String fname;
    private String lname;
    private String gender;
    private String country;
    private String addr;
    private String cb;
 
    public String getAddr() {
        return addr;
    }
 
    public void setAddr(String addr) {
        this.addr = addr;
    }
 
    public String getCb() {
        return cb;
    }
 
    public void setCb(String cb) {
        this.cb = cb;
    }
 
    public String getCountry() {
        return country;
    }
 
    public void setCountry(String country) {
        this.country = country;
    }
 
    public String getGender() {
        return gender;
    }
 
    public void setGender(String gender) {
        this.gender = gender;
    }
 
    public Registration() {
    }
 
    public String getFname() {
        return fname;
    }
 
    public void setFname(String fname) {
        this.fname = fname;
    }
 
    public String getLname() {
        return lname;
    }
 
    public void setLname(String lname) {
        this.lname = lname;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    public String getUsername() {
        return username;
    }
 
    public void setUsername(String username) {
        this.username = username;
    }
 
}

6.Create a RegistrationFormController.java file which extends SimpleFormController to control the user request and return respective ModelAndView object.

RegistrationFormController.java

 
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;
 
public class RegistrationFormController extends SimpleFormController {
 
@Override
    protected ModelAndView onSubmit(Object command) throws Exception {
 
        Registration reg=(Registration)command;
 
        String uname=reg.getUsername();
        String fname=reg.getFname();
        String lname=reg.getLname();
 
        String gender=reg.getGender();
        String country=reg.getCountry();
        String cb=reg.getCb();
        String addr=reg.getAddr();
 
         ModelAndView mv = new ModelAndView(getSuccessView());
 
          mv.addObject("uname",uname);
          mv.addObject("fname",fname);
          mv.addObject("lname",lname);
          mv.addObject("gender",gender);
          mv.addObject("country",country);
          mv.addObject("cb",cb);
          mv.addObject("addr",addr);
 
        return mv;
    }
 
}

7.Create a registrationValidator.java file to validate the form fields like username and password should not be empty.DispatcherServlet is responsible to give property to add Validator to the user request and perform validation.

registrationValidator.java

import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
 
public class registrationValidator implements Validator
{
 
    public boolean supports(Class cl) {
        return Registration.class.isAssignableFrom(cl);
 
    }
 
    public void validate(Object ob, Errors errors) {
       Registration reg=(Registration)ob;
       if (reg.getUsername() == null || reg.getUsername().length() == 0) {
            errors.rejectValue("username", "error.empty.username");
        }
 
       else if (reg.getPassword() == null || reg.getPassword().length() == 0) {
            errors.rejectValue("password", "error.empty.password");
        }
 
    }
 
}

8.Create or Modify messages.properties file which contains the messages for their respective keys.In this file we write messages for two keys empty username and empty password.

messages.properties

1 2	error.empty.username=Please Enter User name error.empty.password=Please Enter Password

9.Building and running the application

Output

Access page:

1
http://localhost:8080/Registration/index.html

When password is emtpy respective error message is displayed using spring errors tag

We can submit the form only after the correct validation of username and password.

Output is displayed with all the values submitted for registration

Spring Framework Articles

Struts LOGIC messagesPresent and messagesNotPresent Tag ( < logic:messagesPresent > and < logic:messagesNotPresent >)

AbhilashEtikala — Tue, 19 Oct 2010 03:14:57 +0000

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Struts LOGIC Tag Library

Struts LOGIC tag library provides tags that are useful in managing conditional generation of output text, looping over object collections for repetitive generation of output text, and application flow management.

Read Integrating Struts With Spring

Syntax to use Struts LOGIC tag library

1	`&lt%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic" %&gt`

< logic:messagesPresent > and < logic:messagesNotPresent>

< logic:messagesPresent > -This tag is used if an ActionMessages object, ActionErrors object, a String, or a String array is present in any scope the nested body content of this tag is evaluated.

< logic:messagesNotPresent > - This tag is used if an ActionMessages object, ActionErrors object, a String, or a String array is not present in any scope the nested body content of this tag is evaluated.

By default both the tags will retrieve the bean it will iterate over from the Globals.ERROR_KEY constant string, but if message attribute is set to ‘true’ the bean will be retrieved from the Globals.MESSAGE_KEY constant string.If message attribute is set to ‘true’, any value assigned to the name attribute will be ignored.

Example Code for < logic:messagesPresent > and < logic:messagesNotPresent>

1.Create of Modify the index.jsp page which is the welcome page for the users.It forwards to the action class.

index.jsp

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
 
<jsp:forward page="logicmessage.do"/>

2.Create an Jsp page and name it as LogicMessageTag.jsp.It is the output page for user which contains the logic tags to to check whether the page contains any error messages or not.

LogicMessageTag.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib  uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
 
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Struts Logic Message Present not Present Tag</title>
    </head>
    <body bgcolor="DDDDDD">
        <h1>struts logic:messagesPresent and logic:messagesNotPresent tag</h1>
        <logic:messagesPresent >
	<h4>There are errors on this page!
    The error message is
    <bean:message key="common.errors.text"/>
    </h4>
</logic:messagesPresent>
<logic:messagesNotPresent message="true">
    <h4>There are no errors messages on this page!</h4>
</logic:messagesNotPresent>
 
    </body>
</html>

3.Create a Form bean.Form bean is used to hold the properties of the submitted form which is a sub class of ActionForm.It contains only one property of type String to hold the text.This form contains the validate method to add error messages to the request page.

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LogicMessageForm.java

package com.myapp.struts;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
 
public class LogicMessageForm extends org.apache.struts.action.ActionForm {
 
    private String text;
 
    public String getText() {
        return text;
    }
 
    public void setText(String text) {
        this.text = text;
    }
 
 
    public LogicMessageForm() {
        super();
 
    }
 
 
    public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) {
 
         ActionErrors errors = new ActionErrors();
 
	   errors.add("common.errors.text",
		new ActionMessage("common.errors.text"));
        return errors;
    }
}

4.ApplicationResource.properties file contains the messages and their corresponding keys.

1	common.errors.text=Text Required

5.Simple Action class LogicMessageAction.java which is a sub class of Action class used to process the user’s request.

LogicMessageAction.java

package com.myapp.struts;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
 
public class LogicMessageAction extends org.apache.struts.action.Action {
 
 
    private final static String SUCCESS = "success";
 
 
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
 
        return mapping.findForward(SUCCESS);
    }
}

6.Create or modify struts config file struts-config.xml with action mappings.Struts-config file contains the information about the configuration of the struts framework to the application.It contains the action mappings which helps to select Action,ActionForm and other information for specific user’s request’s.

 
&lt?xml version="1.0" encoding="UTF-8" ?&gt
 
&lt!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
          "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd"&gt
 
&lt struts-config&gt
    &lt form-beans&gt
        &lt form-bean name="LogicMessageForm" type="com.myapp.struts.LogicMessageForm"/&gt
    &lt/form-beans&gt
 
&lt action-mappings&gt
        &lt action input="/LogicMessageTag.jsp" name="LogicMessageForm" path="/logicmessage" scope="request" validate="true" type="com.myapp.struts.LogicMessageAction"&gt
        &lt forward name="success" path="/LogicMessageTag.jsp"/&gt
 
            &lt/action&gt
&lt/action-mappings&gt
     <message-resources parameter="com/myapp/struts/ApplicationResource"/>
	&lt/struts-config&gt

7.Building and running the application

Output

Access page:

http://localhost:8080/logicmessage/

Struts Framework Articles

Struts LOGIC match and notMatch Tag ( < logic:match > and < logic:notMatch >)

AbhilashEtikala — Mon, 18 Oct 2010 03:14:21 +0000

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Struts LOGIC match and notMatch Tag ( < logic:match > and < logic:notMatch >)

Struts LOGIC Tag Library

Read Integrating Struts With Spring

Syntax to use Struts LOGIC tag library

	<%@ taglib prefix="logic" uri="http://struts.apache.org/tags-logic" %>

< logic:match > and < logic:notMatch>

< logic:match > -This tag matches the selector attributes(String) by specified constant variable.If the value is a substring (appropriately limited by the location attribute), the nested body content of this tag is evaluated

< logic:notMatch > - This tag macthes between the selector attributes(String) by specified constant variable. If the value is not a substring (appropriately limited by the location attribute), the nested body content of this tag is evaluated.

Example Code for < logic:match > and < logic:notMatch>

1.Create of Modify the index.jsp page whic is the welcome page for the users.It displays a Textbox nested inside the form where the text is to be entered.

index.jsp


< %@page contentType="text/html" pageEncoding="UTF-8"%>
< %@taglib  uri="http://struts.apache.org/tags-html" prefix="html" %>
< !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">

< html>
    < head>
        < meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        < title> Struts Match Tag Example< /title>
    < /head>
    < body bgcolor="DDDDDD">

        < html:form action="/logicmatch">
        < h3> Enter Some Text:< /h3>
        < html:text name="LogicMatchForm" property="text"/>
        < html:submit/>


        < /html:form>
    < /body>
< /html>

2.Create an Jsp page and name it as LogicMatchTag.jsp.It is the output page for user which contains the logic tags to Match the text and display whether the specified constant value is a substring or not.

LogicMatchTag.jsp


<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="html" uri="http://jakarta.apache.org/struts/tags-html" %>
<%@taglib prefix="logic" uri="http://jakarta.apache.org/struts/tags-logic" %>


< html>
    < head>
        < meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        < title> Struts Logic Match Tag< /title>
    < /head>
    < body bgcolor="DDDDDD">
        < h1>Struts logic:match and logic:notMatch tag< /h1>
        < logic:match name="LogicMatchForm" property="text" value="java>
< h4> Using  tag the given text contains "java"< /h4>

            < /logic:match>
            <logic:notMatch name="LogicMatchForm" property="text" value="struts">
< h4>  Using  tag the given text does not contains "struts"< /h4>

            < /logic:notMatch>
    < /body>
< /html>

3.Create a Form bean.Form bean is used to hold the properties of the submitted form which is a sub class of ActionForm.It contains only one property of type String to hold the text.

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LogicMatchForm.java


package com.myapp.struts;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;

public class LogicMatchForm extends org.apache.struts.action.ActionForm {

    private String text;

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public LogicMatchForm() {
        super();

    }

}

4.Simple Action class LogicMatchAction.java which is a sub class of Action class used to process the user’s request.

LogicMatchAction.java


package com.myapp.struts;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;

public class LogicMatchAction extends org.apache.struts.action.Action {


    private final static String SUCCESS = "success";

    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {

        return mapping.findForward(SUCCESS);
    }
}

5.Create or modify struts config file struts-config.xml with action mappings.Struts-config file contains the information about the configuration of the struts framework to the application.It contains the action mappings which helps to select Action,ActionForm and other information for specific user’s request’s.



<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
          "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">

< struts-config>
    < form-beans>
        < form-bean name="LogicMatchForm" type="com.myapp.struts.LogicMatchForm"/>
    </form-beans>

< action-mappings>
        < action name="LogicMatchForm" path="/logicmatch" scope="request" type="com.myapp.struts.LogicMatchAction" validate="false">
        < forward name="success" path="/LogicMatchTag.jsp"/>

            </action>
</action-mappings>

	</struts-config>

6.Building and running the application

Output

Access page:

http://localhost:8080/logicmatch/

After evaluation the result is displayed

JavaBeat » AbhilashEtikala

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Syntax to use Spring tag library

transform tag

Example for tags

Spring:transform tag example.

${name}

Output

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Syntax to use Spring tag library

htmlEscape and escapeBody tags

Example for and tags

htmlEscape is false

escapeBody is false

less than <

greater than >

htmlEscape is false

escapeBody is true

less than <

greater than >

htmlEscape is true

escapeBody is false

less than <

greater than >

htmlEscape is true

escapeBody is true

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Output

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Bind and NestedPath tags

Example for and tags

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Your Details are...

${name}

${country}

${email}

Output

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Syntax to use Spring tag library

Message and Theme tags

Example for and tags

Hello this is the blue theme

Output

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Form tags used in this example

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User Name: ${uname} First Name: ${fname} Last Name: ${lname} Gender: ${gender} Country: ${country} Address: ${addr} Selected Check box: ${cb}

Output

Spring Framework Articles

Struts LOGIC messagesPresent and messagesNotPresent Tag ( < logic:messagesPresent > and < logic:messagesNotPresent >)

Syntax to use Struts LOGIC tag library

< logic:messagesPresent > and < logic:messagesNotPresent>

Example Code for < logic:messagesPresent > and < logic:messagesNotPresent>

Output

User Name: ${uname}
First Name: ${fname}
Last Name: ${lname}
Gender: ${gender}
Country: ${country}
Address: ${addr}
Selected Check box: ${cb}