Bean Expression Language Example

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package com.cv.servlet.el;



/**

 * @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.servlet.el;



import java.io.IOException;



import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import org.apache.log4j.Logger;



/**

 * Servlet implementation class MyServlet

 * 

 * @author Chandra Vardhan

 *

 */



public class ElServlet extends HttpServlet {

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

  /**

   * @see HttpServlet#HttpServlet()

   */

  public ElServlet() {

    super();

  }



  /**

   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse

   *      response)

   */

  protected void doGet(HttpServletRequest request,

      HttpServletResponse response) throws ServletException, IOException {

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

    response.setContentType("text/html");

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

    Person person = new Person();

    person.setName("krishna");

    Dog dog = new Dog();    

    dog.setName("jockey");

    Toy t1 = new Toy();

    t1.setName("kids");

    Toy t2 = new Toy();

    t2.setName("adults");

    Toy t3 = new Toy();

    t3.setName("old");    

    dog.setToys(new Toy[]{t1,t2,t3});    

    person.setDog(dog);    

    request.setAttribute("person", person );

    RequestDispatcher dispatcher = request

        .getRequestDispatcher("DirectJSPTwo.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 ElServlet class... ");

    doGet(request, response);

  }



}


 

    
package com.cv.servlet.el;

/**

 * @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.servlet.el;

/**

 * @author Chandra Vardhan

 *

 */

public class Toy {



  public String name;

  

  public String getName() {

    return name;

  }



  public void setName(String name) {

    this.name = name;

  }

  

}





<%@ page language="java" import="java.util.*"

	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>Insert title here</title>

</head>

<body>


    ${person.name}

    ${person.dog.name}

	${person.dog.toys[0].name} 

	${person.dog.toys[1].name}

	${person.dog.toys[2].name}

</body>

</html>







<html>

<head>

<meta charset="US-ASCII">

<title>Login Page</title>

</head>

<body>


	<form action="ElServlet" method="post">


		<br /> 

		<table align="center">

			<tr>

				<td>Name :</td>

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

			</tr>

			<tr>

				<td>Id :</td>

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

			</tr>

			<tr>

			</tr>

			<tr>

				<td></td>

				<td><input type="submit" value="Login" /></td>

			</tr>

		</table>

	</form>



</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.el</groupId>
  <artifactId>beanExpressionLanguage</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">
  <display-name>GoingDirectJSP</display-name>
  <servlet>
    <servlet-name>ElServlet</servlet-name>
    <servlet-class>com.cv.servlet.el.ElServlet</servlet-class>
    <init-param>
      <param-name>jspInitParam</param-name>
      <param-value>jspInitParamValue</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>ElServlet</servlet-name>
    <url-pattern>/ElServlet</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>first.html</welcome-file>
  </welcome-file-list>
</web-app>

























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