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 >>1.直接访问jsp页面乱码

这是因为jsp文件的头部：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

默认pageEncoding="ISO8859-1",把它改成UTF-8就可以正常显示中文了。

>>2.客户端向服务器传输的数据乱码

在Servlet中直接执行下面代码为出现乱码问题：

Sring username = request.getParameter("username");

要在这条语句之前设置一下request的编码方式：

request.setCharacterEncoding("UTF-8");String username = request.getParameter("username");

response.setContentType("text/html;charset=UTF-8");

PrintWriter out = response.getWriter();out.println("原有的中文
");out.println("从客户端获得的用户名：" + username);out.flush();out.close();

>>4.要解决乱码问题，要进行上述的一系列设置，很麻烦，可以用过滤器解决乱码问题：

 过滤器类代码：

package com.autonavi.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;public class CharacterEncodingFilter implements Filter {	private FilterConfig config ;	private String encoding = "ISO-8859-1";		public void destroy() {		encoding = null;		}	public void doFilter(ServletRequest request, ServletResponse response,			FilterChain chain) throws IOException, ServletException {		request.setCharacterEncoding(encoding);		response.setContentType("text/html;charset=" + 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;		}	}}

用于测试的一个Servlet代码:

package com.autonavi.servlet;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 TestServlet extends HttpServlet {	public void destroy() {		super.destroy(); // Just puts "destroy" string in log	}	public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		doPost(request, response);	}	public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {//		request.setCharacterEncoding("UTF-8");//		response.setContentType("text/html;charset=UTF-8");		String username = request.getParameter("username");		PrintWriter out = response.getWriter();		out.println("原有的中文
");		out.println("从客户端获得的用户名：" + username);		out.flush();		out.close();	}	public void init() throws ServletException {			}}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>              	
   	
   	
       	
   	
   	
             
   
    	
    
    
    
    
   
  

   
   		
    		
     
      CharacterEncodingFilter
     		
     
      com.autonavi.filter.CharacterEncodingFilter
     		
     			
      
       encoding
      			
      
       UTF-8
      		
     	
    	
    		
     
      CharacterEncodingFilter
     		
     
      /*
     	
    	  
        
     
      TestServlet
         
     
      com.autonavi.servlet.TestServlet
       
      
        
     
      TestServlet
         
     
      /servlet/testServlet
       
      
        
     
      index.jsp
       
    
   

1.刚开始执行总是显示乱码，后来查到原因是因为过滤器CharacterEncodingFilter中缺少这句代码：

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

2.要以表单的形式发送请求,否则过滤器不起作用，若是以url的方式传递参数，则要在Tomcat相应位置加上：URIEncoding="UTF-8"

3.表单的请求方法method必须为post，不然过滤器也不会起作用

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