java类继承TagSupport
/**
* 输出两个数的和
* @author sys
*
*/
public class TestTag extends TagSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
private int a ;
private int b;
public int getA() {
return a;
}
public void setA(int a) {
this.a = a;
}
public int getB() {
return b;
}
public void setB(int b) {
this.b = b;
}
public int doStartTag(){
StringBuffer buffer = new StringBuffer("<div>");
buffer.append(a+"+"+b+"="+"<strong>"+(a+b)+"</strong>");
buffer.append("</div>");
JspWriter out = pageContext.getOut();
try {
out.print(buffer.toString());//输出到页面
out.close();
} catch (IOException e) {
e.printStackTrace();
}
return SKIP_BODY;
}
}
web-inf 下的tld文件
<?xml version="1.0" encoding="UTF-8" ?> <taglib 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 http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd" version="2.0"> <tlib-version>1.1</tlib-version> <short-name>b</short-name> <uri>http://www.sys.com./testtag</uri> <tag> <name>s</name> <tag-class>com.sys.jsptag.TestTag</tag-class> <body-content>empty</body-content> <attribute> <name>a</name> <required>true</required> <rtexprvalue>true</rtexprvalue> <type>int</type> </attribute> <attribute> <name>b</name> <required>true</required> <rtexprvalue>true</rtexprvalue> <type>int</type> </attribute> </tag> </taglib>
jsp页面调用
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="b" uri="http://www.sys.com./testtag" %>
<!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>求和</title>
</head>
<body>
<b:s b="2" a="2"/>
</body>
</html>