延伸阅读：
今天在找了一天EXT提交表单乱码问题，解决方案N多，均无效:
1、前后台所有文件统一用utf-8编码方式。
2、在Request Headers中设置Content-Type：application/x-www-form-urlencoded; charset=utf-8
3、在Response Headers中设置Content-Type：text/json;charset=utf-8，在JAVA中实现方法
但是如果你也试过如上方法，也不好用的话，可以试试下面的方法，问题原因及解决思路：
从Tomcat5.x开始，GET和POST方法提交的信息，Tomcat采用了不同的方式来处理编码，
对于POST请求，Tomcat会仍然使用request.setCharacterEncoding方法所设置的编码来处理，如果未设置，则使用默认的ISO-8859-1编码。
GET请求则不同，Tomcat对于GET请求并不会考虑使用request.setCharacterEncoding方法设置的编码，而会永远使用iso-8859-1编码
所以，修改Tomcat的POST请求时参数的编码，由ISO-8859-1到UTF-8。
1.过滤器 (包含get与post方式)SetCharacterEncodingFilter.java
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package 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 encoding(String input) { //这个是核心方法！！
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)
{ //核心方法调用
return encoding(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[i] = encoding(values[i]); //核心方法调用
}
}
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");
}
}
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2.web.xml 中增加过滤器配置
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<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns=""
xmlns:xsi=""
xsi:schemaLocation="
/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>
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3.测试页面
(1) test.jsp
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<%@ 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>
</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>
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(2)action.jsp
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<%@ 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>
</head>
参数: <%=request.getParameter("name") %> <br>
</body>
</html>
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(3)CodeServlet.java
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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.
*
* 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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