Java HttpServletRequest UTF-8 编码
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HttpServletRequest UTF-8 Encoding
提问by Carvallegro
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.
我想从请求中获取我的参数（带重音的字符），但它不起作用。我尝试使用用户，request.setCharacterEncoding( "UTF-8" )但它也不起作用。
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 ?
我知道这会URLDecoder.decode( request.getQueryString(), "UTF-8" )返回我的权利字符，但request.getParameterValues()不起作用！有没有人有想法？
采纳答案by VGR
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:
Paul 的建议似乎是最好的行动方案，但如果您要解决它，则根本不需要 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");
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.
更新：由于这获得了很多选票，我想强调 BalusC 的观点，这绝对不是解决方案；这充其量是一种解决方法。人们不应该这样做。
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.
我不知道究竟是什么导致了最初的问题，但我怀疑 URL 已经是 UTF-8 编码的，然后又是 UTF-8 编码的。
回答by Paul Vargas
If you are using Apache Tomcat, request.setCharacterEncoding("UTF-8")only works with POSTrequest.
如果您使用的是 Apache Tomcat，则request.setCharacterEncoding("UTF-8")仅适用于POST请求。
For GETrequest, you need add URIEncoding="UTF-8"on your <Connector>in server.xml.
对于GET请求，您需要添加URIEncoding="UTF-8"您的<Connector>in server.xml。
See more in FAQ/CharacterEncoding - Apache Tomcat wiki space.
回答by Carvallegro
Well, I found a way to resolve my problem, I guess that's not the better solution, but it does works..
好吧，我找到了解决问题的方法，我想这不是更好的解决方案，但它确实有效..
String item = request.getParameterValues("param"); // H??l?¨ne
item = URLEncoder.encode( model.getNameItem(), "ISO-8859-1" ); // H%C3%A9l%C3%A8ne
item = URLDecoder.decode( item, "UTF-8" ); // and finally : Hélène
If it can help anyone else, I'm glad to help :)
如果它可以帮助其他人，我很乐意帮助:)
PS : Paul, I didn't answer you earlier but I already did those things. Thanks anyway for your help.
PS：保罗，我之前没有回答你，但我已经做了这些事情。无论如何感谢您的帮助。
