Servlet response.sendRedirect编码问题 [英] Servlet response.sendRedirect encoding problems

问题描述

所以我用一个朴素的方式重定向我的用户使用GET：

  response.sendRedirect（/ path / index .jsp？type =+ e.getType（）
 +& message =+ e.getMessage（））; 
  

这是工作正常，直到我不得不发送消息，作为实际文本显示给用户。问题是如果消息中有非ASCII字符。我的.jsp文件以UTF-8编码：

 <％@ page language =javacontentType =text / html; charset = UTF-8
 pageEncoding =UTF-8％> 
  

因此，'message'中的所有非ASCII字符都会出现乱码。我不想将我的JVM默认编码设置为UTF-8，那么我该如何解决呢？我尝试使用

  response.setCharacterEncoding（UTF-8）; 
  

重定向之前的Servlet，但它不工作。当我尝试执行：

  out.print（request.getCharacterEncoding（））; 
  

在我的.jsp文件上打印'null'。

sendRedirect（）方法不会为您编码查询字符串。 你必须自己做。

  response.sendRedirect（/ path / index.jsp？type =+ URLEncoder。 encoding（e.getType（），UTF-8）
 +& message =+ URLEncoder.encode（e.getMessage（），UTF-8））; 
  

您可能想将模板重构为实用方法，并接受 Map 。

请注意，我假设服务器配置为使用UTF-8解码GET请求URI。你没有告诉你使用哪个属性，但是在例如Tomcat的情况下，将 URIEncoding =UTF-8属性添加到< Context> 元素。

另请参阅：

• Unicode - 如何获得正确的字符？ / a>

---

无关 language =java是默认已经，只是忽略它。当使用 pageEncoding =UTF-8时使用JSP时， contentType =text / html; charset = UTF-8 / code>，只是忽略它。您真正需要的是<％@ page pageEncoding =UTF-8％> 。注意，这和 response.setCharacterEncoding（UTF-8）实际上是一样的，所以解释为什么它没有效果。 request.getCharacterEncoding（）仅涉及POST请求正文，而不是GET请求URI，因此在GET请求的情况下是不相关的。

So I'm redirecting my user using GET in a naive way:

response.sendRedirect("/path/index.jsp?type="+ e.getType() 
   +"&message="+ e.getMessage());

And this was working fine until I had to send messages, as actual text to be shown to users. The problem is if the message has non-ASCII characters in it. My .jsp files are encoded in UTF-8:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>

So all non-ASCII characters in 'message' gets garbled. I don't want to set my JVM default encoding to UTF-8, so how do I solve this? I tried to use

response.setCharacterEncoding("UTF-8");

on the Servlet before redirecting, but it doesn't work. when I try to execute:

out.print(request.getCharacterEncoding());

on my .jsp file it prints 'null'.

解决方案

The sendRedirect() method doesn't encode the query string for you. You've to do it yourself.

response.sendRedirect("/path/index.jsp?type=" + URLEncoder.encode(e.getType(), "UTF-8")
    + "&message=" + URLEncoder.encode(e.getMessage(), "UTF-8"));

You might want to refactor the boilerplate to an utility method taking a Map or so.

Note that I assume that the server is configured to decode the GET request URI using UTF-8 as well. You didn't tell which one you're using, but in case of for example Tomcat it's a matter of adding URIEncoding="UTF-8" attribute to the <Context> element.

See also:

• Unicode - How to get the characters right?

---

Unrelated to the concrete problem, the language="java" is the default already, just omit it. The contentType="text/html; charset=UTF-8" is also the default already when using JSP with pageEncoding="UTF-8", just omit it. All you really need is <%@ page pageEncoding="UTF-8"%>. Note that this does effectively the same as response.setCharacterEncoding("UTF-8"), so that explains why it didn't have effect. The request.getCharacterEncoding() only concerns the POST request body, not the GET request URI, so it is irrelevant in case of GET requests.

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