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

问题描述

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 request.setCharacterEncoding("UTF-8") 但它也不起作用.

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.

我知道 URLDecoder.decode(request.getQueryString(), "UTF-8") 返回正确的字符，但 request.getParameterValues() 没有工作！

I know that URLDecoder.decode(request.getQueryString(), "UTF-8") returns the right characters, but request.getParameterValues() doesn't work!

有人有想法吗?

推荐答案

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:

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");

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.

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.

我不知道究竟是什么导致了最初的问题，但我怀疑 URL 已经被 UTF-8 编码，然后又被 UTF-8 编码.

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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