1. 编写标签实现类HelloWorldTag extends TagSupport
package com.adam.easyTag.test;
import java.io.IOException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;
public class HelloWorldTag extends TagSupport {
private static final long serialVersionUID = 1L;
public HelloWorldTag() {
}
public int doStartTag() throws JspTagException{
return EVAL_BODY_INCLUDE;
}
public int doEndTag() throws JspTagException{
try {
pageContext.getOut().write("Hello World");
}catch (IOException ex) {
throw new JspTagException("错误");
}
return EVAL_PAGE;
}
}
2. 编写自定义标签定义文件*.tld
<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>mytag</short-name>
<tag>
<name>helloworld</name>
<tag-class>com.adam.easyTag.test.HelloWorldTag</tag-class>
<body-content>empty</body-content>
</tag>
</taglib>
3. 在web.xml中配置自定义标签
<jsp-config>
<taglib>
<taglib-uri>/helloworld</taglib-uri>
<taglib-location>/WEB-INF/helloworld.tld</taglib-location>
</taglib>
</jsp-config>
4. 编写jsp页面
<%@ page language="java" pageEncoding="GBK"%> <%@ taglib uri="/helloworld" prefix="mytag" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>jsp1</title> </head> <body style="background-color:pink"> <form action=""> <h1>下面显示的是自定义标签中的内容</h1> <br><br> <mytag:helloworld></mytag:helloworld> <br> </form> </body> </html>
5. tamcat测试发布
