java+ajax提交后乱码与返回乱码解决

 login.jsp代码清单如下:

<% ... @ page language="java" contentType="text/html;charset=utf-8" %>
DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" >
< html >
   < head >
     < title > login title >
     < script  language ="javascript" > ...
        //创建xmlhttprequest对象
        var xmlHttp = false;
        try...{
            xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
        }catch(e)...{
            try...{
                xmlHttp = new ActiveXObject("microsoft.XMLHTTP");
            }catch(e1)...{
                try...{
                    xmlHttp = new XMLHttpRequest();
                }catch(e2)...{
                    xmlHttp = false;
                }    
            }
        }
        if(!xmlHttp)
        ...{
            alert("server is error");
        }
        function login()
        ...{
            var userName = document.getElementById("userName");
            var pwd = document.getElementById("pwd");
            if(userName.value == 0 || pwd.value == 0)
            ...{
                alert("请输入用户名或密码!");
                userName.focus();
                return false;
            }
            else
            ...{
                //注意这个提交的地址,传递的参数都放在encodeURI()函数当中,它把字符串做为一个uri进行编码,最大的一个好处就是可以处理中文乱码
                var url="http://localhost:8080/ajaxXML/loginServlet?userName="+encodeURI(userName.value)+"&pwd="+encodeURI(pwd.value);
                xmlHttp.open("GET",url,true);
                xmlHttp.onreadyStatechange = show;
                xmlHttp.send(null);
                document.getElementById("message").innerHTML="正在登录，请稍后..........";
            }
        }
        function show()
        ...{
            if(xmlHttp.readyState == 4)//响应与完成,可以访问服务器并响应它
            ...{
                if(xmlHttp.status == 200)//响应状态一切顺利
                ...{
                    var xmlDOM = xmlHttp.responseText;                
                    document.getElementById("message").innerHTML = xmlDOM;
                }
            }
        }
     script >
     < style  type ="text/css" > ...
    
     style >
   head >
   < body >
   < center >
       < div  id ="message" > div >
       < table  align ="center"  cellPadding ="0"  cellSpacing ="1"  bgcolor ="blue"  width ="180" >
       < tr  bgcolor ="#ffffff" >
         < td > userName: td >< td >< input  type ="text"  id ="userName"  name ="userName" /> td >      
       tr >
       < tr  bgcolor ="#ffffff" >
         < td > password: td >< td >< input  type ="password"  id ="pwd"  name ="pwd" /> td >      
       tr >
       < tr  bgcolor ="#ffffff"  align ="center" >
           < td  colspan ="2" >< input  align ="center"  type ="button"  value ="login"  onclick ="return login();" /> td >
       tr >
       table >
   center >
   body >
html >

LoginServlet 代码如下:

public   void  doGet(HttpServletRequest request, HttpServletResponse response)
             throws  ServletException, IOException  ... {
        //注意这句代码,设置服务器响应客户端时的编码格式,注意要写GBK
        response.setContentType("text/html;charset=GBK");
        PrintWriter out = response.getWriter();
        String userName=request.getParameter("userName");
        String pwd = request.getParameter("pwd");
        if(userName.equals("陈涛") && pwd.equals("chen"))...{
            out.print("登录成功");
        }else...{
            out.print("登录失败");
        }
        out.flush();
        out.close();
    }

有兴趣的朋友可以试一下,不管是请求处理乱码还是响应信息乱码都可以处理,如果在请求时还是出现乱码问题，如果提交的是GET方法在servlet 的 doGet 方法中加入如下代码,

userName = new String(userName.getBytes("iso-8859-1"),"gbk");jsp页面不用改动；

有需要的朋友可在在此地址下载:http://d.download.csdn.net/down/383565/ctojxzsycztao