JSP Scopes In Expression Language Example

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package com.cv.jsp.el.scope;



/**

 * @author Chandra Vardhan

 *

 */

public class Dog {



  private String name;





  private Toy[] toys;

  

  public Toy[] getToys() {

    return toys;

  }



  public void setToys(Toy[] toys) {

    this.toys = toys;

  }



  public String getName() {

    return name;

  }



  public void setName(String name) {

    this.name = name;

  }



  

}


 

    
package com.cv.jsp.el.scope;

/**

 * 

 */





/**

 * @author Chandra Vardhan

 *

 */

public class Person {



  private String name;



  private Dog dog;

  

  public Dog getDog() {

    return dog;

  }



  public void setDog(Dog dog) {

    this.dog = dog;

  }



  public Person() {

  }



  public String getName() {

    return name;

  }



  public void setName(String name) {

    this.name = name;

  }

}


 

    
package com.cv.jsp.el.scope;



import java.io.IOException;



import javax.servlet.RequestDispatcher;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;



import org.apache.log4j.Logger;



/**

 * Servlet implementation class MyServlet

 * 

 * 

 * @author Chandra Vardhan

 * 

 */

public class TestServlet extends HttpServlet {

  

  private static final Logger LOGGER = Logger.getLogger(TestServlet.class);

  /**

   * @see HttpServlet#HttpServlet()

   */

  public TestServlet() {

    super();

  }



  /**

   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse

   *      response)

   */

  protected void doGet(HttpServletRequest request,

      HttpServletResponse response) throws ServletException, IOException {

    LOGGER.info("Entered into doGet(--) of TestServlet class... ");

    HttpSession session = request.getSession();



    response.setContentType("text/html");



    String name = request.getParameter("name");



    Person person = new Person();

    person.setName(name);



    Person person2 = new Person();

    person2.setName(name + " session");



    request.setAttribute("person", person);



    request.setAttribute("foo.person", person);

    // person.setName(name + "vardhan");

    session.setAttribute("person", person2);



    session.setAttribute("foo.person", person2);



    Person person3 = new Person();

    person3.setName(name + " context");



    ServletContext context = getServletContext();



    context.setAttribute("person", person3);

    context.setAttribute("foo.person", person3);



    RequestDispatcher dispatcher = request

        .getRequestDispatcher("result.jsp");

    dispatcher.forward(request, response);



  }



  /**

   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse

   *      response)

   */

  protected void doPost(HttpServletRequest request,

      HttpServletResponse response) throws ServletException, IOException {

    LOGGER.info("Entered into doPost(--) of TestServlet class... ");

    doGet(request, response);

  }



}


 

    
package com.cv.jsp.el.scope;

/**

 * 

 */





/**

 * @author Chandra Vardhan

 *

 */

public class Toy {



  public String name;

  

  public String getName() {

    return name;

  }



  public void setName(String name) {

    this.name = name;

  }

  

}





<html>

<head>

<title>Login Page...</title>

<body bgcolor="white">

<br>

<br>

	<form method="POST" action="TestServlet">

		<table border="0" align="center">

			<tr>

				<th align="left">Name :</th>

				<td align="left"><input type="text" name="name"></td>

			</tr>

			<tr>

				<th align="left">Id :</th>

				<td align="left"><input type="password" name="id"></td>

			</tr>

			<tr>

				<td align="right"><input type="submit" value="Log In"></td>

				<td align="left"><input type="reset"></td>

			</tr>

		</table>

	</form>

</body>

</html>





<%@ page language="java" import="com.cv.jsp.el.*"

	contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>

<!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=ISO-8859-1">

<title>Result page...</title>

</head>

<body>


	<fieldset>

		<legend>Result page...</legend>


		<table align="center">

			<tr>

				<td><label>I am from {requestScope.person.name} name : :

				</label></td>

				<td><font color="RED">${requestScope.person.name}</font></td>

			</tr>


			<tr>

				<td><label>I am from {requestScope["foo.person"].name} : :

				</label></td>

				<td><font color="RED">${requestScope["foo.person"].name}</font></td>

			</tr>

			

				<tr>

				<td><label>I am from  {sessionScope.person.name} : :

				</label></td>

				<td><font color="RED">${sessionScope.person.name}</font></td>

			</tr>

				<tr>

				<td><label>I am from requestScope person name 4 way : :

				</label></td>

				<td><font color="RED">${requestScope["foo.person"].name}</font></td>

			</tr>


			<tr>

				<td><label>I am from {sessionScope["foo.person"].name} : : </label></td>

				<td><font color="RED">${sessionScope["foo.person"].name}</font></td>

			</tr>


			<tr>

				<td><label>I am from {applicationScope.person.name}

						: : </label></td>

				<td><font color="RED">${applicationScope.person.name}</font></td>

			</tr>



			<tr>

				<td><label>I am from {person.name} : : </label></td>

				<td><font color="RED">${person.name}</font></td>

			</tr>

			

		</table>

	</fieldset>

</body>

</html>



















#By default enabling Console appender

# Root logger option

log4j.rootLogger=INFO, stdout



# Redirect log messages to console

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.Target=System.out

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%-5p [%c]:%L -->> %m%n



# Redirect log messages to a log file

#log4j.appender.file=org.apache.log4j.RollingFileAppender

#log4j.appender.file.File=C:\\servlet-application.log

#log4j.appender.file.MaxFileSize=5MB

#log4j.appender.file.MaxBackupIndex=10

#log4j.appender.file.layout=org.apache.log4j.PatternLayout

#log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n















	
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.cv.servlet.zip</groupId>
	<artifactId>JSPScopesInExpressionLanguage</artifactId>
	<version>1.0</version>
	<packaging>war</packaging>
	<properties>
		<log4j-version>1.2.16</log4j-version>		
		<java-version>1.8</java-version>
	</properties>

	<build>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.3</version>
				<configuration>
					<source>${java.version}</source>
					<target>${java.version}</target>
				</configuration>
			</plugin>
			<plugin>
				<artifactId>maven-war-plugin</artifactId>
				<version>2.6</version>
				<configuration>
					<warSourceDirectory>WebContent</warSourceDirectory>
					<failOnMissingWebXml>false</failOnMissingWebXml>
				</configuration>
			</plugin>
		</plugins>
	</build>
	<dependencies>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
			<version>3.0-alpha-1</version>
		</dependency>
		<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.3.1</version>
		</dependency>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>${log4j.version}</version>
		</dependency>
	</dependencies>
</project>








 
<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee  http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"   version="3.1">
  <servlet>
		<servlet-name>TestServlet</servlet-name>
		<servlet-class>com.cv.jsp.el.scope.TestServlet</servlet-class>
		<init-param>
			<param-name>jspInitParam</param-name>
			<param-value>jspInitParamValue</param-value>
		</init-param>
	</servlet>
	<servlet-mapping>
		<servlet-name>TestServlet</servlet-name>
		<url-pattern>/TestServlet</url-pattern>
	</servlet-mapping>
	<welcome-file-list>
    <welcome-file>first.html</welcome-file>
  </welcome-file-list>
</web-app>













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