JSP Body Content Taglib TLD Example

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package com.cv.jsp.tld.tag;



import java.io.IOException;



import javax.servlet.jsp.JspException;

import javax.servlet.jsp.JspWriter;

import javax.servlet.jsp.tagext.BodyContent;

import javax.servlet.jsp.tagext.BodyTagSupport;



import org.apache.log4j.Logger;



/**

 *

 * @author Chandra Vardhan

 */

public class ChangeCaseBodyTagSupportImpl extends BodyTagSupport {

  

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



    private String mCase;



    public void setCase(String pCase) {

        this.mCase = pCase;

    }



    

    public int doAfterBody() throws JspException {

      

      LOGGER.info("Entered into doAfterBody() of ChangeCaseBodyTagSupportImpl class... ");

        try {

            BodyContent bc = getBodyContent();

            String body = bc.getString();

            JspWriter out = bc.getEnclosingWriter();

            if (body != null) {

                if ("upper".equalsIgnoreCase(mCase)) {

                    out.print(body.toUpperCase());

                } else {

                    out.print(body.toLowerCase());

                }

            }

        } catch (IOException ioe) {

            throw new JspException("Error: " + ioe.getMessage());

        }

        return SKIP_BODY;

    }

}


 

    
package com.cv.jsp.tld.tag;



import java.io.IOException;



import javax.servlet.jsp.JspException;

import javax.servlet.jsp.tagext.BodyContent;

import javax.servlet.jsp.tagext.BodyTagSupport;



import org.apache.log4j.Logger;



/**

 *

 * @author Chandra Vardhan

 */

public class LoopTextBodyTagSupportImpl extends BodyTagSupport {



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

    private int mTimes = 0;

    private BodyContent mBodyContent;



    public void setTimes(int pTimes) {

        mTimes = pTimes;

    }



    

    public void setBodyContent(BodyContent pBodyContent) {

      LOGGER.info("Entered into setBodyContent(-) of LoopTextBodyTagSupportImpl class... ");

        mBodyContent = pBodyContent;

    }



    

    public int doStartTag() throws JspException {

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

        if (mTimes > 1) {

            return EVAL_BODY_TAG;

        } else {

            return SKIP_BODY;

        }

    }



    

    public int doAfterBody() throws JspException {

      LOGGER.info("Entered into doAfterBody() of LoopTextBodyTagSupportImpl class... ");

        if (mTimes > 1) {

            mTimes--;

            return EVAL_BODY_TAG;

        } else {

            return SKIP_BODY;

        }

    }



    

    public int doEndTag() throws JspException {

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

        try {

            if (mBodyContent != null) {

                mBodyContent.writeOut(mBodyContent.getEnclosingWriter());

            }

        } catch (IOException pIOEx) {

            throw new JspException("Error: " + pIOEx.getMessage());

        }

        return EVAL_PAGE;

    }

}





<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

  "http://www.w3.org/TR/html4/loose.dtd">

<%@ taglib prefix="ct" uri="tagdefinition"%>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Upper or Lower Case</title>

</head>

<body>

	<h2>

		Upper Case :

		<ct:changeCase case="upper">

            Hello World

        </ct:changeCase>

	</h2>

	<h2>

		Lower Case :

		<ct:changeCase case="lower">

                Hello World

        </ct:changeCase>

	</h2>



	<ct:loopText times="3">

		<h3>Loop Text!</h3>

	</ct:loopText>



	<ct:tag1>

		<ct:tag2 case="chote" />

		<%

			String name = "kodam";

		%>

		<ct:tag1>value=chote</ct:tag1>

	</ct:tag1>

</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>JSPBodyContentTaglibTLDProject</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>tagLibProject</display-name>
  <welcome-file-list>
    <welcome-file>input.jsp</welcome-file>
  </welcome-file-list>
</web-app>

























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