Filter实现浏览器是否缓存页面信息,和控制编码

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后台配置文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>jqueryeasyui</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>

<!-- 设置浏览器缓存 -->
<filter>
<filter-name>ResponseHeaderFilter</filter-name>
<filter-class>tk.Martin.filterDemo.filter.ResponseHeaderFilter</filter-class>
<init-param>
<param-name>Cache-Control</param-name>
<param-value>max-age=1000</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>ResponseHeaderFilter</filter-name>
<url-pattern>*.css</url-pattern>
</filter-mapping>

<!-- 设置浏览器不缓存 -->
<!-- <filter>
<filter-name>ResponseHeaderFilter</filter-name>
<filter-class>tk.Martin.filterDemo.filter.ResponseHeaderFilter</filter-class>
<init-param>
<param-name>Cache-Control</param-name>
<param-value>private,no-cache,no-store,must-revalidate</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>ResponseHeaderFilter</filter-name>
<url-pattern>*.js</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>ResponseHeaderFilter</filter-name>
<url-pattern>*.css</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>ResponseHeaderFilter</filter-name>
<url-pattern>*.jpg</url-pattern>
</filter-mapping>
-->

<servlet>
<servlet-name>UserServlet</servlet-name>
<servlet-class>tk.Martin.filterDemo.servlet.UserServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>UserServlet</servlet-name>
<url-pattern>/userOper.do</url-pattern>
</servlet-mapping>

</web-app>

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这是控制是否浏览器缓存的代码

package tk.Martin.filterDemo.filter;

import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ResponseHeaderFilter implements Filter {
FilterConfig filterConfig;

@Override
public void destroy() {
// TODO Auto-generated method stub

}

@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub

HttpServletRequest request=(HttpServletRequest) req;
HttpServletResponse response=(HttpServletResponse) res;

for(Enumeration e=filterConfig.getInitParameterNames();e.hasMoreElements();){

String headerName=(String) e.nextElement();
System.out.println("========================="+headerName+"===================================");
response.addHeader(headerName, filterConfig.getInitParameter(headerName));

}
chain.doFilter(request, response);

}

@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
this.filterConfig=filterConfig;
}

}

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这是控制上传的编码的Filter过滤类

package tk.Martin.filterDemo.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class CharacterEncodingFilter implements Filter {
private String characterEncoding;

@Override
public void destroy() {
// TODO Auto-generated method stub

}

@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
request.setCharacterEncoding(characterEncoding);
chain.doFilter(request, response);

}

@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
this.characterEncoding = filterConfig.getInitParameter("encoding");
System.out.println("页面编码方式===============" + this.characterEncoding
+ "=================================");
}

}

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这是前台的jsp的代码
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@include file="/common/tag.jsp"%>
<%@include file="/common/jquery.jsp"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>

<body>
<form action="${pageContext.request.contextPath}/userOper.do"
method="post">

<table>
<tr>
<td>用户名:</td>
<td><input name="name" type="text"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="提交"></td>
</tr>
</table>

</form>
<img alt="" src="${pageContext.request.contextPath}/1.jpg">
</body>
</html>