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2022-04-25 21:49:59
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usertag.tld
<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.0" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd">
<tlib-version>1.0</tlib-version>
<jsp-version>2.0</jsp-version>
<short-name>baoyou</short-name>
<uri>/usertag</uri>
<tag>
<name>userinfo</name>
<tag-class>com.baoyou.test.autotag.UserTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>user</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:javaee="http://java.sun.com/xml/ns/javaee"
xmlns:jsp="http://java.sun.com/xml/ns/javaee/jsp" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
id="WebApp_9" version="2.4">
<jsp-config>
<taglib>
<taglib-uri>/usertag</taglib-uri>
<taglib-location>/WEB-INF/usertag.tld</taglib-location>
</taglib>
</jsp-config>
</web-app>
public class User {
private int userId;
private String username;
private String password;
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
package com.baoyou.test.autotag;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
public class UserTag extends TagSupport{
private static final long serialVersionUID = 1L;
private User user;
@Override
public int doStartTag() throws JspException {
JspWriter out = this.pageContext.getOut();
try{
if (user == null) {
out.println("No UserInfo Found...");
}
out.println("<table width='500px' border='1' align='center'>");
out.println("<tr>");
out.println("<td width='20%'>userid:</td>");
out.println("<td>" + user.getUserId() + "</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>username:</td>");
out.println("<td>" + user.getUsername() + "</td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td>password:</td>");
out.println("<td>" + user.getPassword() + "</td>");
out.println("</tr>");
out.println("</table>");
}catch(Exception e){
throw new JspException(e.getMessage());
}
return SKIP_BODY;
}
@Override
public int doEndTag() throws JspException {
return EVAL_PAGE;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
<%@ page language="java" import="java.util.*,com.baoyou.test.autotag.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib uri="/usertag" prefix="baoyou"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<% User user = new User();
user.setUserId(1);
user.setUsername("baoyou");
user.setPassword("baoyou");
pageContext.setAttribute("userinfo", user); %>
<baoyou:userinfo user="${pageScope.userinfo }" />
</body>
</html>
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