MyTag自定义标签

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if标签

一是首先建立标签类

package com.qiankun.tagsutil;import java.io.IOException;import javax.servlet.jsp.JspException;import javax.servlet.jsp.tagext.SimpleTagSupport;public class IFTag extends SimpleTagSupport {private boolean test;public void setTest(boolean test) {this.test = test;}public void doTag() throws JspException, IOException {if (test) {getJspBody().invoke(null);}}}

二是建立tld标签

<?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 http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"> <tlib-version>1.0</tlib-version> <short-name>exec</short-name> <uri>http://www.qiankun.com/exec</uri> <tag> <name>if</name> <tag-class>com.qiankun.tagsutil.IFTag</tag-class> <body-content>scriptless</body-content> <attribute> <name>test</name> <required>true</required> <rtexprvalue>true</rtexprvalue> <type>boolean</type> </attribute>  </tag></taglib>

三：建立exec,jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@taglib uri="http://www.qiankun.com/exec" prefix="exec"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>if标签</title></head><body>    <exec:if test="${3 >2 }">   确实是这样    </exec:if>      <exec:if test="${3 <2 }">   确实不是这样    </exec:if>  </body></html>

页面特殊符号转义符号

一是首先建立标签类

package com.qiankun.tagsutil;import java.io.IOException;import java.io.StringWriter;import javax.servlet.jsp.JspException;import javax.servlet.jsp.tagext.SimpleTagSupport;public class TranHTML extends SimpleTagSupport{ /**  * 页面特殊符号转义符号  */public void doTag() throws JspException, IOException {StringWriter writer = new StringWriter(); getJspBody().invoke(writer); String str = writer.toString(); str=filter(str); getJspContext().getOut().write(str);}private String filter(String message) {if (message == null)return (null);char content[] = new char[message.length()];message.getChars(0, message.length(), content, 0);StringBuffer result = new StringBuffer(content.length + 50);for (int i = 0; i < content.length; i++) {switch (content[i]) {case '<':result.append("<");break;case '>':result.append(">");break;case '&':result.append("&");break;case '"':result.append(""");break;default:result.append(content[i]);}}return (result.toString());}}

二是建立tld标签

<?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 http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"><tlib-version>1.0</tlib-version><short-name>exec</short-name><uri>http://www.qiankun.com/exec</uri><tag><name>if</name><tag-class>com.qiankun.tagsutil.IFTag</tag-class><body-content>scriptless</body-content><attribute><name>test</name><required>true</required><rtexprvalue>true</rtexprvalue><type>boolean</type></attribute></tag><tag><name>Tran</name><tag-class>com.qiankun.tagsutil.TranHTML</tag-class><body-content>scriptless</body-content></tag></taglib>

三：建立exec,jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@taglib uri="http://www.qiankun.com/exec" prefix="exec"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>if标签</title></head><body>  <exec:Tran>adadadada<@%""asdaddxx</exec:Tran>  </body></html>

防盗链

一是首先建立标签类

package com.qiankun.tagsutil;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.jsp.JspException;import javax.servlet.jsp.PageContext;import javax.servlet.jsp.tagext.SimpleTagSupport;/** * 防止盗链 * @author wqk */public class RefTag extends SimpleTagSupport {public void doTag() throws JspException, IOException {PageContext pc=(PageContext) getJspContext();HttpServletRequest request = (HttpServletRequest) pc.getRequest();HttpServletResponse response= (HttpServletResponse) pc.getResponse(); String ref = request.getHeader("Referer");if(ref ==null || "".equals(ref) || !ref.startsWith("http://127.0.0.1")){response.sendRedirect(request.getContextPath()+"/index.jsp");return;}}}

二是建立tld标签

<?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 http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"><tlib-version>1.0</tlib-version><short-name>exec</short-name><uri>http://www.qiankun.com/exec</uri><tag><name>if</name><tag-class>com.qiankun.tagsutil.IFTag</tag-class><body-content>scriptless</body-content><attribute><name>test</name><required>true</required><rtexprvalue>true</rtexprvalue><type>boolean</type></attribute></tag><tag><name>Tran</name><tag-class>com.qiankun.tagsutil.TranHTML</tag-class><body-content>scriptless</body-content></tag><tag><name>ref</name><tag-class>com.qiankun.tagsutil.RefTag</tag-class><body-content>empty</body-content></tag></taglib>

三：建立exec,jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib uri="http://www.qiankun.com/exec" prefix="exec"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>防止盗链</title></head><body><exec:ref />美女的奋斗史</body></html>

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