Java Technologies: JSP Classic Tags Example

Click here to download eclipse supported ZIP file

 
    
package com.cv.jsp.classic.tags;



import java.io.IOException;



import javax.servlet.jsp.JspException;

import javax.servlet.jsp.JspWriter;

import javax.servlet.jsp.tagext.TagSupport;



import org.apache.log4j.Logger;



public class ClassicTagImpl extends TagSupport {

  

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



  JspWriter out;

  String[] movies = { "In Time", "3 Idiots", "Chanti" };

  int i;



  public int doStartTag() throws JspException {

    LOGGER.info("Entered into doStartTag() of ClassicTagImpl class... ");



    out = pageContext.getOut();

    i = 0;

    try {

      out.println("Classic tag output - in doStartTag<br>");

      LOGGER.info("Classic tag output - in doStartTag<br>");



    } catch (IOException ex) {

      throw new JspException("IOException- " + ex.toString());

    }

    return EVAL_BODY_INCLUDE;

  }



  public int doEndTag() throws JspException {

    LOGGER.info("Entered into doEndTag() of ClassicTagImpl class... ");



    try {

      out.println("Iterator - in doEndTag()");

      LOGGER.info("Iterator - in doEndTag()");

    } catch (IOException ex) {

      throw new JspException("IO Exception- " + ex.toString());

    }

    return EVAL_PAGE;

  }



}


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

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


<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<%@ taglib prefix="my" uri="classicURI"%>


ADVICE Before tag

<br>

<my:tag1>

<br>

Inside body of the tag!!!

<br>

</my:tag1>

<br>

ADVICE After tag

#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.jsp.classic.tags</groupId>
	<artifactId>JSPClassicTagsProject</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>
		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>jsp-api</artifactId>
			<version>2.0</version>
		</dependency>
		<dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>
		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>1.1.2</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>JSP Classic Tags...</display-name>
	<welcome-file-list>
		<welcome-file>advice.jsp</welcome-file>
	</welcome-file-list>

</web-app>

JSP Classic Tags Example

Click here to download eclipse supported ZIP file

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