java中的乱码问题

1如果使用的tomcat服务器,在server.xml中Connector 标签后加 URIEncoding="UTF-8";

2使用web过滤器:

(1)、新建一个SetCharacterEncodingFilter.java的类:

package com.util;
import java.io.IOException;
import javax.servlet.*;

public class SetCharacterEncodingFilter 
implements Filter{
 protected String encoding = null;

protected FilterConfig filterConfig =
null;

protected boolean ignore = true;

public void destroy()
 {
   
this.encoding = null;
   
this.filterConfig = null;

}

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);
    }
   
chain.doFilter(request, response);
 }

public void init(FilterConfig filterConfig)
throws ServletException
 {
   
this.filterConfig = filterConfig;
    //
获取初始化参数
   
this.encoding = filterConfig.getInitParameter("encoding");
    String value
= filterConfig.getInitParameter("ignore");
    if (value ==
null)
    {
    
this.ignore = true;
    } else if
(value.equalsIgnoreCase("true"))
    {
    
this.ignore = true;
    } else if
(value.equalsIgnoreCase("yes"))
    {
    
this.ignore = true;
    } else
    
this.ignore = false;
 }

protected String selectEncoding(ServletRequest
request)
 {
    return
(this.encoding);
 }

}

(2)web.xml中在web-app里加入:

<!--定义一个过滤器, 并设定其初始化参数--><filter>

<filter-name>Set Character
Encoding</filter-name>
  
<filter-class>com.util.SetCharacterEncodingFilter</filter-class>

<init-param>
   
<param-name>encoding</param-name>

<param-value>GB2312</param-value>

</init-param>
</filter>
<!--制定过滤器映射-->
<filter-mapping>
  
<filter-name>Set Character
Encoding</filter-name>
  
<url-pattern>/*</url-pattern>

</filter-mapping>

3.<%@ page language="java" import="java.util.*,com.scce.entity.*" pageEncoding="utf-8"%>

<head>

  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

</head>

4.String name=new String(request.getParameter("name").getBytes("ISO8859-1"),"GBK");

new String(fileName.getBytes("UTF-8"), "GBK")

5.request.setCharacterEncoding("gbk");

response.setContentType("text/html;charset=gbk");

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