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分类: Java

2009-09-03 17:32:24

 
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

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");
    
  
    }
  
}

2.web.xml 中增加过滤器配置

<?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>

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>
    

  </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>
    

  </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.

     *
     * 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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