if標籤
一是首先建立標籤類
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標籤
<?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標籤</title></head>
<body>
<exec:if test="${3 >2 }">
確實是這樣
</exec:if>
<exec:if test="${3 <2 }">
確實不是這樣
</exec:if>
</body>
</html>
頁面特殊符號轉義符號
一是首先建立標籤類
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{
/**
* 頁面特殊符號轉義符號
*/
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標籤
<?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標籤</title></head>
<body>
<exec:Tran>adadadada<@%""asdaddxx</exec:Tran>
</body>
</html>
防盜鏈
一是首先建立標籤類
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;
/**
* 防止盜鏈
* @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標籤
<?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>防止盜鏈</title>
</head>
<body>
<exec:ref />
美女的奮鬥史
</body>
</html>
