JSP自定义标签
准备资料
【tld示例】
<?xml version="1.0" encoding="UTF-8"?> <taglib xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instanse" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2.1.xsd" version="2.1"> <tlib-version>1.0</tlib-version> <short-name>name</short-name> </taglib>
需要建立三个文件.java .tld .jsp
java代码：
package com.zhiqi.testTaglib;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
public class TestTaglib extends TagSupport {
private static final long serialVersionUID = 1L;
@Override
public int doStartTag() throws JspException {
JspWriter jOut=this.pageContext.getOut();
try {
jOut.println("welcome");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return TagSupport.SKIP_BODY;
}
}
tld代码：
<?xml version="1.0" encoding="UTF-8"?> <taglib xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instanse" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2.1.xsd" version="2.1"> <tlib-version>1.0</tlib-version> <short-name>nam</short-name> <tag> <name>myTag</name> <tag-class>com.zhiqi.testTaglib.TestTaglib</tag-class> <body-content>empty</body-content> </tag> </taglib>
jsp代码：
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib prefix="myTa" uri="/WEB-INF/zhiqi.tld" %>
<!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=utf-8">
<title>Test TagLib</title>
</head>
<body>
<h3>测试JSP自定义标签</h3>
<myTa:myTag/>
</body>
</html>
原理画图如下:
【带name属性的标签】
package com.zhiqi.testTaglib;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;
public class TestTaglib extends TagSupport {
private static final long serialVersionUID = 1L;
private String name;
public void setName(String name){
this.name=name;
}
public String getName(){
return this.name;
}
@Override
public int doStartTag() throws JspException {
JspWriter jOut=this.pageContext.getOut();
try {
jOut.println(name+" "+"welcome");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return TagSupport.SKIP_BODY;
}
}
<?xml version="1.0" encoding="UTF-8"?> <taglib xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instanse" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2.1.xsd" version="2.1"> <tlib-version>1.0</tlib-version> <short-name>nam</short-name> <tag> <name>myTag</name> <tag-class>com.zhiqi.testTaglib.TestTaglib</tag-class> <body-content>empty</body-content> <attribute> <name>name</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> </taglib>
<myTa:myTag name="ooqq" />
【】
