Java EE 中的请求和响应编码问题 - 相关API汇总

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    request   setContentType       不存在
   request   getContentType       "获取请求正文的 MIME 类型. 如果未知, null"   (详解,API[1])
   request   setCharacterEncoding   覆写请求体的编码.   [2]
   request   getCharacterEncoding   获取请求体的的编码, 如未定义, null.   [3]
   //
   response   setContentType       "设置响应正文的 MIME 类型"   (详解)
   response   getContentType       "返回响应正文的 MIME 类型"   (详解)
   response   setCharacterEncoding   "设置响应正文的字符编码, 默认为 ISO-8859-1"   (详解)
   response   getCharacterEncoding   "返回响应正文的字符编码"   (详解)

   参考原文:
   [1]   String getContentType()
           Returns the MIME type of the body of the request, or null if the type is not known. For HTTP servlets, same as the value of the CGI variable CONTENT_TYPE.
           Returns:
               a String containing the name of the MIME type of the request, or null if the type is not known
   [2]   Overrides the name of the character encoding used in the body of this request. This method must be called prior to reading request parameters or reading input using getReader(). Otherwise, it has no effect.
       "覆盖"请求体中的编码名称. 必须在读取参数和输入流之前设置, 否则无效.
   [3]   String getCharacterEncoding()
           Returns the name of the character encoding used in the body of this request. This method returns null if the request does not specify a character encoding
           Returns:
               a String containing the name of the character encoding, or null if the request does not specify a character encoding
   详解 : 孙卫琴《Tomcat 与 Java Web 开发技术详解》

   注意 : request 的3个 API 都写明了是"body of the request", 也就是只针对请求体, 不是请求头.

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