JSP EL Basic Condition Check Example

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package com.cv.jsp.el.basic;

/**

 * 

 */





/**

 * @author Chandra Vardhan

 *

 */

public class Dog {



  private String name;



  public Dog() {

  }



  public String getName() {

    return name;

  }



  public void setName(String name) {

    this.name = name;

  }

}


 

    
package com.cv.jsp.el.basic;



import java.io.IOException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;



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 ServletAttributeImpl

 * 

 *  @author Chandra Vardhan

 */

public class ServletAttributeImpl extends HttpServlet {



  private static final Logger LOGGER = Logger

      .getLogger(ServletAttributeImpl.class);



  protected void doPost(HttpServletRequest request, HttpServletResponse response)

      throws ServletException, IOException {

    LOGGER.info("LOGGER : ServletAttributeImpl doGet(HttpServletRequest,HttpServletResponse)");

    response.setContentType("text/html");    

    String num = "2";

    request.setAttribute("num", num);  

    

    Integer i = new Integer(3);    

    request.setAttribute("integer", i);

    

    ArrayList<String> list = new ArrayList<String>();

    list.add("true");

    list.add("false");    

    list.add("2");

    list.add("10");

    

    request.setAttribute("list", list);

    RequestDispatcher dispatcher = request

        .getRequestDispatcher("result.jsp");

    dispatcher.forward(request, response);

  }



  /**

   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse

   *      response)

   */

  protected void doGet(HttpServletRequest request,

      HttpServletResponse response) throws ServletException, IOException {

    LOGGER.info("LOGGER : ServletAttributeImpl doGet(HttpServletRequest ,HttpServletResponse )");

    doPost(request, response);

  }



}





<!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=US-ASCII">

<title>Login Form</title>


<style type="text/css">

</style>

</head>


<body>

	<br>

	<br>

	<div align="center">

		<form action="ServletAttributeImpl" method="post" id='test'>

			<fieldset>

				<legend>Welcome to the Expression Language test project...</legend>


				<table align="center">

				

					<tr>

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

					</tr>

				</table>

			</fieldset>

		</form>

	</div>

</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>Example of getting init param</title>

</head>

<body>


	<fieldset>

		<legend>Result page...</legend>

		<br>


		<jsp:useBean id="mydog" class="com.cv.jsp.el.basic.Dog">

			<jsp:setProperty name="mydog" property="name" value="${list[1]}" />

		</jsp:useBean>


		<br>

		<table align="center">


			<tr>

				<td><label>I am from {num > 3} : : </label></td>

				<td><font color="RED"> ${num > 3}</font></td>

			</tr>

			<tr>

				<td><label>I am from {integer le 12} : : </label></td>

				<td><font color="RED">${integer le 12}</font></td>

			</tr>


			<tr>

				<td><label>I am from {requestScope["integer"] ne 4 and

						6 le num || false} : : </label></td>

				<td><font color="RED">${requestScope["integer"] ne 4 and 6 le num || false}</font></td>

			</tr>

			<tr>

				<td><label>I am from {list[0] || list["1"] and true} :

						: </label></td>

				<td><font color="RED">${list[0] || list["1"] and true}</font></td>

			</tr>

			<tr>

				<td><label>I am from {num > integer} : : </label></td>

				<td><font color="RED">${num > integer}</font></td>

			</tr>

			<tr>

				<td><label>I am from {num == integer-1} : : </label></td>

				<td><font color="RED">${num == integer-1}</font></td>

			</tr>


			<tr>

				<td><label>I am from {mydog.name and true} : : </label></td>

				<td><font color="RED">${mydog.name and true}</font></td>

			</tr>

			<tr>

				<td><label>I am from {42 div 0} : : </label></td>

				<td><font color="RED">${42 div 0}</font></td>

			</tr>


			<tr>

				<td><label>I am from {foo +9 } : : </label></td>

				<td><font color="RED"> ${foo +9 }</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>
  <artifactId>JSPEL_BasicConditionCheckProject</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>
	<groupId>com.cv.jsp.el.cookie</groupId>
</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>Test Servlet</display-name>


	<context-param>
		<param-name>name</param-name>
		<param-value>Chote</param-value>
	</context-param>
	<servlet>
		<servlet-name>ServletAttributeImpl</servlet-name>
		<servlet-class>com.cv.jsp.el.basic.ServletAttributeImpl</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>ServletAttributeImpl</servlet-name>
		<url-pattern>/ServletAttributeImpl</url-pattern>
	</servlet-mapping>
	<welcome-file-list>
		<welcome-file>login.html</welcome-file>
	</welcome-file-list>

</web-app>













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