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>
- 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;
- }
- }
- 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
- + "=================================");
- }
- }
- 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>
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