1.前台传值乱码

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?? 前台JavaScript转码：

???

... 
var url = "reg?userid=" + str;  
url = encodeURI(url);  
url = encodeURI(url);  
... 

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?? 后台解码：

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... 
String userId = request.getParameter("userid");  
userId = java.net.URLDecoder.decode(id,"UTF-8");  
...

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??? 前台2次转码，后台一次

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2.后台传值乱码

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...  
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
...

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??? 转码必须放在前面