HttpServletRequest UTF-8编码 [英] HttpServletRequest UTF-8 Encoding

问题描述

我看到很多问题像我的，但没有一个单一的答案工作...
这是事情：我想从请求（字符与重音符号）获取我的参数，但它不工作。我尝试使用用户 request.setCharacterEncoding（UTF-8），但它也不起作用。

我知道 URLDecoder.decode（request.getQueryString（），UTF-8）返回我的权限字符，但 request.getParameterValues（）不行！
有没有人有想法？

谢谢

解决方案

p>保罗的建议似乎是最好的行动方案，但如果你要解决这个问题，你根本不需要URLEncoder或URLDecoder：

  String item = request.getParameter（param）; 
 
 byte [] bytes = item.getBytes（StandardCharsets.ISO_8859_1）; 
 item = new String（bytes，StandardCharsets.UTF_8）; 
 
 // Java 6：
 // byte [] bytes = item.getBytes（ISO-8859-1）; 
 // item = new String（bytes，UTF-8）; 
  

更新：由于这是获得了很多投票，我想压力BalusC的观点，这绝对不是解决办法;这是最好的解决方法。人们不应该这样做。

我不知道是什么原因造成的，但我怀疑URL已经是UTF-8编码，然后是UTF -8再次编码。

I saw a lot of question like mine but not a single answer works... Here's the thing : I want to get my parameters from the request (characters with accents) but it doesn't work. I tried to user request.setCharacterEncoding( "UTF-8" ) but it didn't work either.

I know that URLDecoder.decode( request.getQueryString(), "UTF-8" ) returns me the rights characters but request.getParameterValues() doesn't work ! Does anyone have an idea ?

Thank you

解决方案

Paul's suggestion seems like the best course of action, but if you're going to work around it, you don't need URLEncoder or URLDecoder at all:

String item = request.getParameter("param"); 

byte[] bytes = item.getBytes(StandardCharsets.ISO_8859_1);
item = new String(bytes, StandardCharsets.UTF_8);

// Java 6:
// byte[] bytes = item.getBytes("ISO-8859-1");
// item = new String(bytes, "UTF-8");

Update: Since this is getting a lot of votes, I want to stress BalusC's point that this definitely is not a solution; it is a workaround at best. People should not be doing this.

I don't know exactly what caused the original issue, but I suspect the URL was already UTF-8 encoded, and then was UTF-8 encoded again.

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