servlet中的编码问题 [英] encoding problem in servlet

问题描述

我有一个servlet从客户端接收一些参数，然后做一些工作。
来自客户端的参数是中文，所以我经常在servet中得到一些无效字符。
例如：
如果我输入

  http：// localhost：8080 / Servlet？q =中文& type = test 
  

然后在servlet中，'type'的参数是正确的），但是'q'的参数不正确编码，它们变成无法解析的无效字符。

但是，如果我再次输入加法器栏，更改为：

  http：// localhost：8080 / Servlet？q =％D6％D0％CE％C4& type = test 
  

现在我的servlet将获得'q'的正确参数。

有什么问题？

UPDATE / p>

BTW，当我发送带有帖子的表单时，它很好。
当我在ajax中发送它们时，例如：

  url =http：//..q= '中文'，
 xmlhttp.open（POST，url，true）; 
  

然后服务器端也得到无效字符。

似乎只是当中文字符编码为％xx，服务器端可以得到正确的结果。 p>

这就是说 http：//.../q=中文不起作用，
http：//.../q=%D6%D0%CE%C4 工作。

但是为什么 http://www.google.cn.hk/search?hl=zh-CN&newwindow=1&safe=strict&q=%E4%B8%AD%E6%96%87&btnG= Google +％E6％90％9C％E7％B4％A2& aq = f& aqi =& aql =& oq =& gs_rfai = work？

解决方案

确认使用表单本身的页面的编码也是UTF-8，并且确保浏览器被指示将页面读取为UTF-8。假设它是JSP，只是把它放在页面的最顶部，以实现： / p>

 <％@ page pageEncoding =UTF-8％>然后，要将GET查询字符串作为UTF-8处理，请确保所讨论的servletcontainer配置为：这样做。目前还不清楚你使用的是哪一个，所以这里有一个Tomcat示例：设置 URIEncoding 属性-6.0-doc / config / http.html> < Connector>  元素。 /conf/server.xml 到 UTF-8 。
 < Connector URIEncoding =UTF-8> 
  
对于要使用POST的情况，您需要确保 HttpServletRequest 被指示使用UTF-8解析POST请求主体。
 请求.setCharacterEncoding（UTF-8）; 
  
在访问第一个参数之前调用此  
 
 
 
另请参阅：
 
 
 
 
 
  Unicode  - 如何获得正确的字符？ 
 
 
 
I have a servlet which receive some parameter from the client ,then do some job.
And the parameter from the client is Chinese,so I often got some invalid characters in the servet.
For exmaple:
If I enter
http://localhost:8080/Servlet?q=中文&type=test
Then in the servlet,the parameter of 'type' is correct(test),however the parameter of 'q' is not correctly encoding,they become invalid characters that can not parsed.

However if I enter the adderss bar again,the url will changed to :
http://localhost:8080/Servlet?q=%D6%D0%CE%C4&type=test
Now my servlet will get the right parameter of 'q'.

What is the problem?

UPDATE

BTW,it words well when I send the form with post. 
WHen I send them in the ajax,for example: 
url="http://..q='中文',
xmlhttp.open("POST",url,true); 
Then the server side also get the invalid characters. 

It seems that just when the Chinese character are encoded like %xx,the server side can get the right result. 

That's to say http://.../q=中文 does not work,
http://.../q=%D6%D0%CE%C4 work. 

But why "http://www.google.com.hk/search?hl=zh-CN&newwindow=1&safe=strict&q=%E4%B8%AD%E6%96%87&btnG=Google+%E6%90%9C%E7%B4%A2&aq=f&aqi=&aql=&oq=&gs_rfai=" work？
解决方案
Ensure that the encoding of the page with the form itself is also UTF-8 and ensure that the browser is instructed to read the page as UTF-8. Assuming that it's JSP, just put this in very top of the page to achieve that:
<%@ page pageEncoding="UTF-8" %>
Then, to process GET query string as UTF-8, ensure that the servletcontainer in question is configured to do so. It's unclear which one you're using, so here's a Tomcat example: set the URIEncoding attribute of the <Connector> element in /conf/server.xml to UTF-8.
<Connector URIEncoding="UTF-8">
For the case that you'd like to use POST, then you need to ensure that the HttpServletRequest is instructed to parse the POST request body using UTF-8.
request.setCharacterEncoding("UTF-8");
Call this before you access the first parameter. A Filter is the best place for this.

See also:


Unicode - How to get the characters right?


                        
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