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java自定义标签权限

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<?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">

<description>zfx的自定义标签库</description>

<tlib-version>1.0</tlib-version>
<short-name>GaclTagLibrary</short-name>

<uri>/gacl</uri>


<tag>
<description>这个标签的作用是用来输出客户端的IP地址</description>

<name>viewIP</name>

<tag-class>cn.springmvc.controller.ViewIPTag</tag-class>
<body-content>jsp</body-content>
<attribute>
<name>userName</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>

</taglib>

-----------------------------------------------------------------------------------------------

package cn.springmvc.controller;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.Tag;
public class ViewIPTag implements Tag {
//接收传递进来的PageContext对象
private PageContext pageContext;
private String userName;
@Override
public int doEndTag() throws JspException {
System.out.println("调用doEndTag()方法");
return 0;
}
@Override
public int doStartTag() throws JspException {
if(userName.equals("John")){
System.out.println("1231");
return SKIP_BODY; //不继续执行了。
}
System.out.println("调用doStartTag()方法");
System.out.println(userName);
HttpServletRequest request =(HttpServletRequest) pageContext.getRequest();
JspWriter out = pageContext.getOut();
String ip = request.getRemoteAddr();
try {
//这里输出的时候会抛出IOException异常
out.write(ip);
out.write("<h1>呵呵</h1>");
} catch (IOException e) {
//捕获IOException异常后继续抛出
throw new RuntimeException(e);
}
System.out.println(SKIP_BODY);
System.out.println(EVAL_PAGE);
return EVAL_PAGE; //继续执行的意思
}
@Override
public Tag getParent() {
return null;
}
@Override
public void release() {
System.out.println("调用release()方法");
}
@Override
public void setPageContext(PageContext pageContext) {
System.out.println("setPageContext(PageContext pageContext)");
this.pageContext = pageContext;
}
@Override
public void setParent(Tag arg0) {

}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}

}

--------------------------------------------------------------------------------------------

<%@ page language="java" pageEncoding="UTF-8"%>

<%@taglib uri="/gacl" prefix="xdp"%>
<!DOCTYPE HTML>
<html>
<head>
<title>输出客户端的IP</title>
</head>
<body>
你的IP地址是(使用java代码获取输出)：
<%
//在jsp页面中使用java代码获取客户端IP地址
String ip = request.getRemoteAddr();
out.write(ip);
%>
<hr/>
你的IP地址是(使用自定义标签获取输出)：
<%--使用自定义标签viewIP --%>
<xdp:viewIP userName="John1231" >添加</xdp:viewIP>
</body>
</html>

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java自定义标签 权限

java自定义标签权限