中文过滤问题哪里错了过滤不了中文呐？

http://localhost/lesson18/index2.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <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>
    This is my JSP page. <br>
    欢迎，欢迎，热烈欢迎！<br>
  <form action="/lesson18/servlet/demoCode2" method="post">
  <input type="text" name="username"><br>
  <input type="submit"><br>
  </form>
  </body>
</html>
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<filter>
<filter-name>EncodingFilter</filter-name>
<filter-class>com.lesson18.CharacterEncodingFilter</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>/*</url-pattern>
</filter-mapping>


  <servlet>
    <servlet-name>DemoCodeServlet</servlet-name>
    <servlet-class>com.lesson18.DemoCodeServlet</servlet-class>
  </servlet>
    <servlet>
    <servlet-name>DemoCodeServlet1</servlet-name>
    <servlet-class>com.lesson18.DemoCodeServlet1</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>DemoCodeServlet2</servlet-name>
    <servlet-class>com.lesson18.DemoCodeServlet2</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>DemoCodeServlet3</servlet-name>
    <servlet-class>com.lesson18.DemoCodeServlet3</servlet-class>
  </servlet>  <servlet-mapping>
    <servlet-name>DemoCodeServlet</servlet-name>
    <url-pattern>/servlet/demoCode</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>DemoCodeServlet1</servlet-name>
    <url-pattern>/servlet/demoCode1</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>DemoCodeServlet2</servlet-name>
    <url-pattern>/servlet/demoCode2</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>DemoCodeServlet3</servlet-name>
    <url-pattern>/servlet/demoCode3</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>
package com.lesson18;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 FilterConfig config;
private String encoding = "ISO8859_1";

public void destroy()
{
config = null;
}

public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException
{
request.setCharacterEncoding(encoding);
chain.doFilter(request, response);
}

public void init(FilterConfig config) throws ServletException
{
this.config = config;
String s = config.getInitParameter("encoding");
if (s != null)
{
encoding = s;
}
}

}
package com.lesson18;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 DemoCodeServlet2 extends HttpServlet
{

/**
 * 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
{
// request.setCharacterEncoding("utf-8");去掉这行依然可以显示中文，因为有XML过滤器过滤。
// response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println("  <BODY>");
out.print("Welcome!<br>");
out.println("用户名：" + request.getParameter("username"));
out.println("  </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}

}

解决方案 »

  1.   

    private String encoding = "ISO8859_1";改成private String encoding = "UTF-8";
    另外ISO8859_1 最好写成ISO8859-1或ISO-8859-1
      

  2.   

    1.把这行代码加进去
    response.setContentType("text/html;charset=utf-8"); 2.返回的html里 //可能有1就够了
    out.println("<HTML>");
    改成
    out.println("<html lang=\"zh-cn\">");
      

  3.   

    我现在怀疑你是浏览器的编码格式 是不是有问题  你把浏览器编码格式改成UTF-8  不要使用GBK
      

  4.   

    package com.lesson18;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 FilterConfig config;
    private String encoding = "ISO8859_1"; public void destroy() {
    config = null;
    } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
    throws IOException, ServletException {
    request.setCharacterEncoding(encoding);
    request.setCharacterEncoding("utf-8");
    response.setCharacterEncoding("utf-8");
    response.setContentType("text/html;character=UTF-8");
    chain.doFilter(request, response);
    } public void init(FilterConfig config) throws ServletException {
    this.config = config;
    String s = config.getInitParameter("encoding");
    if (s != null) {
    encoding = s;
    }
    }}