Http请求中Content-Type讲解以及在Spring MVC注解中produce和consumes配置详解

叁歲伎倆 2022-05-24 09:24 136阅读 0赞

转载于：[https://blog.csdn.net/shinebar/article/details/54408020][https_blog.csdn.net_shinebar_article_details_54408020]

引言： 在Http请求中，我们每天都在使用Content-type来指定不同格式的请求信息，但是却很少有人去全面了解content-type中允许的值有多少，这里将讲解Content-Type的可用值，以及在[spring][] MVC中如何使用它们来映射请求信息。

1.  Content-Type

MediaType，即是Internet Media Type，互联网媒体类型；也叫做MIME类型，在Http协议消息头中，使用Content-Type来表示具体请求中的媒体类型信息。

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1.  类型格式：type/subtype(;parameter)? type  
2.  主类型，任意的字符串，如text，如果是\*号代表所有；   
3.  subtype 子类型，任意的字符串，如html，如果是\*号代表所有；   
4.  parameter 可选，一些参数，如Accept请求头的q参数， Content-Type的 charset参数。

例如： Content-Type: text/html;charset:utf-8;

常见的媒体格式类型如下：

*      text/html ： HTML格式
 *      text/plain ：纯文本格式        
    
 *      text/xml ：  XML格式
 *      image/gif ：gif图片格式      
    
 *      image/jpeg ：jpg图片格式   
    
 *      image/png：png图片格式

以application开头的媒体格式类型：

*     application/xhtml+xml ：XHTML格式
 *     application/xml     ： XML数据格式
 *     application/atom+xml  ：Atom XML聚合格式      
    
 *     application/json    ： JSON数据格式
 *     application/pdf       ：pdf格式    
    
 *     application/msword  ： Word文档格式
 *     application/octet-stream ： 二进制流数据（如常见的文件下载）
 *     application/x-www-form-urlencoded ： <form encType=””>中默认的encType，form表单数据被编码为key/value格式发送到服务器（表单默认的提交数据的格式）

另外一种常见的媒体格式是上传文件之时使用的：

*      multipart/form-data ： 需要在表单中进行文件上传时，就需要使用该格式

以上就是我们在日常的开发中，经常会用到的若干content-type的内容格式。

2.   Spring MVC中关于关于Content-Type类型信息的使用

首先我们来看看RequestMapping中的Class定义：

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1.  @Target(\{ElementType.METHOD, ElementType.TYPE\})  
2.  @Retention(RetentionPolicy.RUNTIME)  
3.  @Documented  
4.  @Mapping  
5.  public @interface RequestMapping \{  
6.        String\[\] value() default \{\};  
7.        RequestMethod\[\] method() default \{\};  
8.        String\[\] params() default \{\};  
9.        String\[\] headers() default \{\};  
10.       String\[\] consumes() default \{\};  
11.       String\[\] produces() default \{\};  
12. \}

value:  指定请求的实际地址， 比如 /action/info之类。  
method：  指定请求的method类型， GET、POST、PUT、DELETE等  
consumes： 指定处理请求的提交内容类型（Content-Type），例如application/json, text/html;  
produces:    指定返回的内容类型，仅当request请求头中的(Accept)类型中包含该指定类型才返回  
params： 指定request中必须包含某些参数值是，才让该方法处理  
headers： 指定request中必须包含某些指定的header值，才能让该方法处理请求

其中，consumes， produces使用content-typ信息进行过滤信息；headers中可以使用content-type进行过滤和判断。

3. 使用示例

3.1 headers

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1.  @RequestMapping(value = "/test", method = RequestMethod.GET, headers="Referer=http://www.ifeng.com/")    
2.  public void testHeaders(@PathVariable String ownerId, @PathVariable String petId) \{        
3.    // implementation omitted    
4.  \}

这里的Headers里面可以匹配所有Header里面可以出现的信息，不局限在Referer信息。

示例2

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1.  @RequestMapping(value = "/response/ContentType", headers = "Accept=application/json")    
2.  public void response2(HttpServletResponse response) throws IOException \{    
3.      //表示响应的内容区数据的媒体类型为json格式，且编码为utf-8(客户端应该以utf-8解码)    
4.      response.setContentType("application/json;charset=utf\-8");    
5.      //写出响应体内容    
6.      String jsonData = "\{\\"username\\":\\"zhang\\", \\"password\\":\\"123\\"\}";    
7.      response.getWriter().write(jsonData);    
8.  \}

服务器根据请求头“Accept=application/json”生产json数据。

当你有如下Accept头，将遵守如下规则进行应用：  
①Accept：text/html,application/xml,application/json  
      将按照如下顺序进行produces的匹配 ①text/html ②application/xml ③application/json  
②Accept：application/xml;q=0.5,application/json;q=0.9,text/html  
      将按照如下顺序进行produces的匹配 ①text/html ②application/json ③application/xml  
      参数为媒体类型的质量因子，越大则优先权越高(从0到1)  
③Accept：\*/\*,text/\*,text/html  
      将按照如下顺序进行produces的匹配 ①text/html ②text/\* ③\*/\*

即匹配规则为：最明确的优先匹配。

## Requests部分 ##

<table style="border-spacing:0px;width:852px;color:rgb(51,51,51);font-size:14px;background-color:rgb(255,255,255);font-family:Arial;line-height:26px;"> 
 <tbody style="margin:0px;padding:0px;"> 
  <tr style="margin:0px;padding:0px;"> 
   <th style="padding:3px;margin:0px;text-align:center;border-color:rgb(192,192,192);background:rgb(237,239,240) none repeat scroll 0px 0px;border-collapse:collapse;">Header</th> 
   <th style="padding:3px;margin:0px;text-align:center;border-color:rgb(192,192,192);background:rgb(237,239,240) none repeat scroll 0px 0px;border-collapse:collapse;">解释</th> 
   <th style="padding:3px;margin:0px;text-align:center;border-color:rgb(192,192,192);background:rgb(237,239,240) none repeat scroll 0px 0px;border-collapse:collapse;">示例</th> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">指定客户端能够接收的内容类型</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept: text/plain, text/html</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept-Charset</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">浏览器可以接受的字符编码集。</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept-Charset: iso-8859-5</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept-Encoding</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">指定浏览器可以支持的web服务器返回内容压缩编码类型。</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept-Encoding: compress, gzip</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept-Language</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">浏览器可接受的语言</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept-Language: en,zh</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept-Ranges</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">可以请求网页实体的一个或者多个子范围字段</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept-Ranges: bytes</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Authorization</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">HTTP授权的授权证书</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Cache-Control</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">指定请求和响应遵循的缓存机制</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Cache-Control: no-cache</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Connection</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">表示是否需要持久连接。（HTTP 1.1默认进行持久连接）</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Connection: close</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Cookie</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">HTTP请求发送时，会把保存在该请求域名下的所有cookie值一起发送给web服务器。</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Cookie: $Version=1; Skin=new;</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Length</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">请求的内容长度</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Length: 348</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Type</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">请求的与实体对应的MIME信息</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Type: application/x-www-form-urlencoded</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Date</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">请求发送的日期和时间</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Date: Tue, 15 Nov&nbsp;2010 08:12:31 GMT</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Expect</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">请求的特定的服务器行为</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Expect: 100-continue</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">From</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">发出请求的用户的Email</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">From: user@email.com</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Host</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">指定请求的服务器的域名和端口号</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Host: www.zcmhi.com</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">If-Match</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">只有请求内容与实体相匹配才有效</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">If-Match: “737060cd8c284d8af7ad3082f209582d”</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">If-Modified-Since</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">如果请求的部分在指定时间之后被修改则请求成功，未被修改则返回304代码</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">If-Modified-Since: Sat, 29 Oct 2010 19:43:31 GMT</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">If-None-Match</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">如果内容未改变返回304代码，参数为服务器先前发送的Etag，与服务器回应的Etag比较判断是否改变</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">If-None-Match: “737060cd8c284d8af7ad3082f209582d”</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">If-Range</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">如果实体未改变，服务器发送客户端丢失的部分，否则发送整个实体。参数也为Etag</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">If-Range: “737060cd8c284d8af7ad3082f209582d”</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">If-Unmodified-Since</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">只在实体在指定时间之后未被修改才请求成功</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">If-Unmodified-Since: Sat, 29 Oct 2010 19:43:31 GMT</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Max-Forwards</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">限制信息通过代理和网关传送的时间</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Max-Forwards: 10</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Pragma</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">用来包含实现特定的指令</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Pragma: no-cache</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Proxy-Authorization</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">连接到代理的授权证书</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Proxy-Authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Range</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">只请求实体的一部分，指定范围</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Range: bytes=500-999</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Referer</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">先前网页的地址，当前请求网页紧随其后,即来路</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Referer: http://www.zcmhi.com/archives/71.html</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">TE</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">客户端愿意接受的传输编码，并通知服务器接受接受尾加头信息</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">TE: trailers,deflate;q=0.5</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Upgrade</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">向服务器指定某种传输协议以便服务器进行转换（如果支持）</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">User-Agent</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">User-Agent的内容包含发出请求的用户信息</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">User-Agent: Mozilla/5.0 (Linux; X11)</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Via</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">通知中间网关或代理服务器地址，通信协议</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Via: 1.0 fred, 1.1 nowhere.com (Apache/1.1)</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Warning</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">关于消息实体的警告信息</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Warn: 199 Miscellaneous warning</td> 
  </tr> 
 </tbody> 
</table>

## Responses 部分     ##

<table style="border-spacing:0px;width:852px;color:rgb(51,51,51);font-size:14px;background-color:rgb(255,255,255);font-family:Arial;line-height:26px;"> 
 <tbody style="margin:0px;padding:0px;"> 
  <tr style="margin:0px;padding:0px;"> 
   <th style="padding:3px;margin:0px;text-align:center;border-color:rgb(192,192,192);background:rgb(237,239,240) none repeat scroll 0px 0px;border-collapse:collapse;">Header</th> 
   <th style="padding:3px;margin:0px;text-align:center;border-color:rgb(192,192,192);background:rgb(237,239,240) none repeat scroll 0px 0px;border-collapse:collapse;">解释</th> 
   <th style="padding:3px;margin:0px;text-align:center;border-color:rgb(192,192,192);background:rgb(237,239,240) none repeat scroll 0px 0px;border-collapse:collapse;">示例</th> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept-Ranges</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">表明服务器是否支持指定范围请求及哪种类型的分段请求</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Accept-Ranges: bytes</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Age</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">从原始服务器到代理缓存形成的估算时间（以秒计，非负）</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Age: 12</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Allow</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">对某网络资源的有效的请求行为，不允许则返回405</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Allow: GET, HEAD</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Cache-Control</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">告诉所有的缓存机制是否可以缓存及哪种类型</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Cache-Control: no-cache</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Encoding</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">web服务器支持的返回内容压缩编码类型。</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Encoding: gzip</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Language</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">响应体的语言</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Language: en,zh</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Length</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">响应体的长度</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Length: 348</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Location</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">请求资源可替代的备用的另一地址</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Location: /index.htm</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-MD5</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">返回资源的MD5校验值</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-MD5: Q2hlY2sgSW50ZWdyaXR5IQ==</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Range</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">在整个返回体中本部分的字节位置</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Range: bytes 21010-47021/47022</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Type</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">返回内容的MIME类型</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Content-Type: text/html; charset=utf-8</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Date</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">原始服务器消息发出的时间</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Date: Tue, 15 Nov 2010 08:12:31 GMT</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">ETag</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">请求变量的实体标签的当前值</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">ETag: “737060cd8c284d8af7ad3082f209582d”</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Expires</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">响应过期的日期和时间</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Expires: Thu, 01 Dec 2010 16:00:00 GMT</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Last-Modified</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">请求资源的最后修改时间</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Last-Modified: Tue, 15 Nov 2010 12:45:26 GMT</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Location</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">用来重定向接收方到非请求URL的位置来完成请求或标识新的资源</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Location: http://www.zcmhi.com/archives/94.html</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Pragma</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">包括实现特定的指令，它可应用到响应链上的任何接收方</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Pragma: no-cache</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Proxy-Authenticate</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">它指出认证方案和可应用到代理的该URL上的参数</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Proxy-Authenticate: Basic</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">refresh</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">应用于重定向或一个新的资源被创造，在5秒之后重定向（由网景提出，被大部分浏览器支持）</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;"> 
    <div style="padding:0px;margin:0px;line-height:25.2px;"> 
     <span style="font-family:monospace;margin:0px;padding:0px;">&nbsp;</span> 
    </div><p style="margin-top:5px;margin-bottom:5px;color:rgb(35,35,35);font-family:verdana, Arial, Helvetica, sans-serif;"><span style="font-family:monospace;margin:0px;padding:0px;">&nbsp;</span></p> 
    <div style="padding:0px;margin:0px;line-height:25.2px;"> 
     <span style="font-family:Georgia, 'Times New Roman', 'Bitstream Charter', Times, serif;margin:0px;padding:0px;">Refresh: 5; url=</span> 
    </div> 
    <div style="padding:0px;margin:0px;line-height:25.2px;"> 
     <span style="font-family:Georgia, 'Times New Roman', 'Bitstream Charter', Times, serif;margin:0px;padding:0px;">http://www.zcmhi.com/archives/94.html</span> 
    </div></td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Retry-After</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">如果实体暂时不可取，通知客户端在指定时间之后再次尝试</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Retry-After: 120</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Server</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">web服务器软件名称</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Server: Apache/1.3.27 (Unix) (Red-Hat/Linux)</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Set-Cookie</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">设置Http Cookie</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Set-Cookie: UserID=JohnDoe; Max-Age=3600; Version=1</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Trailer</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">指出头域在分块传输编码的尾部存在</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Trailer: Max-Forwards</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Transfer-Encoding</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">文件传输编码</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;"><span style="font-family:monospace;margin:0px;padding:0px;"><span style="font-family:Georgia, 'Times New Roman', 'Bitstream Charter', Times, serif;margin:0px;padding:0px;">Transfer-Encoding:chunked</span></span></td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Vary</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">告诉下游代理是使用缓存响应还是从原始服务器请求</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Vary: *</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Via</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">告知代理客户端响应是通过哪里发送的</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Via: 1.0 fred, 1.1 nowhere.com (Apache/1.1)</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Warning</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">警告实体可能存在的问题</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">Warning: 199 Miscellaneous warning</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">WWW-Authenticate</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">表明客户端请求实体应该使用的授权方案</td> 
   <td style="padding:5px;margin:0px;border-color:rgb(192,192,192);line-height:21.6px;vertical-align:top;border-collapse:collapse;">WWW-Authenticate: Basic</td> 
  </tr> 
 </tbody> 
</table>

3.2 params的示例

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1.  @RequestMapping(value = "/test/\{userId\}", method = RequestMethod.GET, params="myParam=myValue")    
2.  public void findUser(@PathVariable String userId) \{        
3.    // implementation omitted    
4.  \}

仅处理请求中包含了名为“myParam”，值为“myValue”的请求，起到了一个过滤的作用。

3.3 consumes/produces

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1.  @Controller    
2.  @RequestMapping(value = "/users", method = RequestMethod.POST, consumes="application/json", produces="application/json")    
3.  @ResponseBody  
4.  public List**<****User****>** addUser(@RequestBody User userl) \{        
5.      // implementation omitted    
6.      return List**<****User****>** users;  
7.  \}

方法仅处理request Content-Type为“application/json”类型的请求. produces标识==>处理request请求中Accept头中包含了"application/json"的请求，同时暗示了返回的内容类型为application/json;

4. 总结

在本文中，首先介绍了Content-Type主要支持的格式内容，然后基于@RequestMapping标注的内容介绍了主要的使用方法，其中,headers, consumes,produces,都是使用Content-Type中使用的各种媒体格式内容，可以基于这个格式内容来进行访问的控制和过滤。

参考资料：

1.  HTTP中支持的Content-Type: http://tool.oschina[.NET][]/commons

2.  Media Type介绍。 http://www.iteye.com/topic/1127120

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