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" />
【】