Tomcat 5/6 utf-8 编码下完美解决(post/get)中文表单问题的过滤器
1.过滤器(包含get与post方式)SetCharacterEncodingFilter.javapackage com.qingfeng.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;import javax.servlet.UnavailableException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;public class SetCharacterEncodingFilter implements Filter { /** * * 对 HttpServletRequestWrapper 进行扩充, 不影响原来的功能并能提供所有的 HttpServletRequest * 接口中的功能. 它可以统一的对 Tomcat 默认设置下的中文问题进行解决而只需要用新的 Request 对象替换页面中的 * request 对象即可. */ protected String encoding = null; protected FilterConfig filterConfig = null; //protected boolean ignore = true; public void destroy() { this.encoding = null; this.filterConfig = null; } class Request extends HttpServletRequestWrapper { public Request(HttpServletRequest request) { super(request); } /** * 转换由表单读取的数据的内码. * 从 ISO 字符转到 utf-8(或gbk). */ public String toChi(String input) { try { byte[] bytes = input.getBytes("ISO-8859-1"); return new String(bytes, encoding); } catch (Exception ex) { } return null; } /** * Return the HttpServletRequest holded by this object. */ private HttpServletRequest getHttpServletRequest() { return (HttpServletRequest)super.getRequest(); } /** * 读取参数 -- 修正了中文问题. */ public String getParameter(String name) { return toChi(getHttpServletRequest().getParameter(name)); } /** * 读取参数列表 - 修正了中文问题. */ public String[] getParameterValues(String name) { String values[] = getHttpServletRequest().getParameterValues(name); if (values != null) { for (int i = 0; i < values.length; i++) { values = toChi(values); } } return values; } } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // if (ignore || (request.getCharacterEncoding() == null)) { // String encoding = selectEncoding(request); /*if (encoding != null) request.setCharacterEncoding(encoding);*/ // } HttpServletRequest httpreq = (HttpServletRequest)request; if(httpreq.getMethod().equals("POST")) { request.setCharacterEncoding(encoding); } else { request = new Request(httpreq); } // Pass control on to the next filter chain.doFilter(request, response); } /** * Place this filter into service. * * @param filterConfig The filter configuration object */ public void init(FilterConfig filterConfig) throws ServletException { this.filterConfig = filterConfig; this.encoding = filterConfig.getInitParameter("encoding"); }}
2.web.xml中增加过滤器配置
<?xml version="1.0" encoding="UTF-8"?><web-app version="2.4" 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-app_2_4.xsd"> <filter> <filter-name>encodingfilter</filter-name> <filter-class>com.filter.SetCharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingfilter</filter-name> <url-pattern>/jsp/encoding/*</url-pattern> </filter-mapping><servlet> <description>changecode</description> <display-name>changecode</display-name> <servlet-name>CodeServlet</servlet-name> <servlet-class>com.filter.CodeServlet</servlet-class></servlet><servlet-mapping> <servlet-name>CodeServlet</servlet-name> <url-pattern>/servlet/CodeServlet</url-pattern></servlet-mapping></web-app>
3.测试页面
(1) test.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <title>My JSP 'test.jsp' starting page</title> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --></head><body> <form action="action.jsp"> GET 方式: <input type=text name="name" value="GET 中文"> <input type=submit> </form> <form action="action.jsp" method="POST"> POST 方式: <input type=text name="name" value="POST 中文"> <input type=submit> </form> <form action="/Test_2/servlet/CodeServlet"> GET 方式: <input type=text name="name" value="GET 中文"> <input type=submit> </form> <form action="/Test_2/servlet/CodeServlet" method="POST"> POST 方式: <input type=text name="name" value="POST 中文"> <input type=submit> </form></body></html>
(2)action.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <title>My JSP 'action.jsp' starting page</title> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --></head> 参数: <%=request.getParameter("name") %> <br></body></html>
(3)CodeServlet.java
package com.filter.codetest;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CodeServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name = request.getParameter("name"); System.out.println("get方式:"+name); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name = request.getParameter("name"); System.out.println("post方式:"+name); }}
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