spring boot——参数传递——请求注解@RequestMapping各个属性值

一时失言乱红尘 2023-09-29 09:30 13阅读 0赞

1、RequestMapping接口的源码如下，里面定义了七个属性

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      <code>public</code>&nbsp; 
      <code>interface</code>&nbsp; 
      <code>RequestMappingextends Annotation { </code> 
     </div> 
     <div> 
      <code>　　　　　　</code> 
      <code>// 指定映射的名称</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>public</code>&nbsp; 
      <code>abstract</code>&nbsp; 
      <code>String name();</code> 
     </div> 
     <div> 
      <code>　　　　　　</code> 
      <code>// 指定请求路径的地址</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>public</code>&nbsp; 
      <code>abstract</code>&nbsp; 
      <code>String[] value();</code> 
     </div> 
     <div> 
      <code>　　　　　　</code> 
      <code>// 指定请求的方式，是一个RequsetMethod数组，可以配置多个方法</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>public</code>&nbsp; 
      <code>abstract</code>&nbsp; 
      <code>RequestMethod[] method();</code> 
     </div> 
     <div> 
      <code>　　　　　　</code> 
      <code>// 指定参数的类型</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>public</code>&nbsp; 
      <code>abstract</code>&nbsp; 
      <code>String[] params();</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>public</code>&nbsp; 
      <code>abstract</code>&nbsp; 
      <code>String[] headers();</code> 
     </div> 
     <div> 
      <code>　　　　　　</code> 
      <code>// 指定数据请求的格式</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>public</code>&nbsp; 
      <code>abstract</code>&nbsp; 
      <code>String[] consumes();</code> 
     </div> 
     <div> 
      <code>　　　　　　</code> 
      <code>// 指定返回的内容类型</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>public</code>&nbsp; 
      <code>abstract</code>&nbsp; 
      <code>String[] produces();</code> 
     </div> 
     <div> 
      <code>}</code> 
     </div> 
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2、下面是我在服务器端编写的一个程序，我将@RequestMapping中的参数都采用了符合原接口的定义的数组的数据类型。

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      <code>package</code>&nbsp; 
      <code>com.awaimai.web;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>org.hibernate.validator.constraints.*;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>org.springframework.validation.annotation.Validated;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>org.springframework.web.bind.annotation.*;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.servlet.http.Cookie;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.servlet.http.HttpServletRequest;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.servlet.http.HttpServletResponse;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.validation.constraints.Max;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.validation.constraints.Min;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.validation.constraints.Size;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>java.util.Enumeration;</code> 
     </div> 
     <div> 
      <code>@RestController</code> 
     </div> 
     <div> 
      <code>@Validated</code> 
     </div> 
     <div> 
      <code>public</code>&nbsp; 
      <code>class</code>&nbsp; 
      <code>kzq</code> 
     </div> 
     <div> 
      <code>{ </code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>@RequestMapping</code> 
      <code>(value = { </code> 
      <code>"/test4"</code> 
      <code>,</code> 
      <code>"/test5"</code> 
      <code>},method={RequestMethod.POST, RequestMethod.GET}, consumes={ </code> 
      <code>"application/json"</code> 
      <code>}, &lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; produces={ </code> 
      <code>"application/json"</code> 
      <code>}, params={ </code> 
      <code>"name=mike"</code> 
      <code>,</code> 
      <code>"pwd=123456"</code> 
      <code>},headers={ </code> 
      <code>"a=1"</code> 
      <code>})</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>@ResponseBody</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>public</code>&nbsp; 
      <code>String test4()</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>{ </code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>return</code>&nbsp; 
      <code>"{\"id\":1}"</code> 
      <code>;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>}</code> 
     </div> 
     <div> 
      <code>}</code> 
     </div> 
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2.1 测试value属性：映射的是请求的地址，如果是一个数据，那么这两个地址之间的关系是或(||)的关系

2.2、method属性：定义了请求的方式，如果此属性定义了多个值，那么可以适应多种请求方式，

比如此例中我定义了RequestMethod.POST与RequestMethod.GET两种方法，采用postMan发送两种请求也可以得到正确的JSON数据。

正确的请求方式如下：

![fc26859a0c1fd2e5a2904edf16d8f7d1.png][]

![fb6c4985e08bb0fffd6d45089e46ccff.png][]

![75a1b6aad03c360c930b5ded57023432.png][]

![2c5de348bdc741e576db0cf96753fa15.png][]

2.3、consumes属性 ：指定处理请求的提交内容类型(Content-Type)，例如application/json, text/html;

produces属性：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，

本人实验了一下，如果请求的头中不包含这个属性也能有正确的返回值，但是如果有Accept这个属性，那么前后要匹配，否则输出报错；

![3430972dfa66efb99f39fd3c4a796aa8.png][]

![6dc02225f5191daf23d95d79e095e6f5.png][]

![fd0950aa398c3cee964cb86a5a953c0d.png][]

![f446a1031aef8829f46c3ebe567d16e5.png][]

![c1320d7f45e1f1b72fa14fe42748b5db.png][]

![04e8e2184ed37cb499c89d664abeb627.png][]

=================================================================================

URL: http://localhost:8080/test5?name=mike&pwd=123456

如果mike和123456的值未携带或者为空，报错

![5a9a5526330f1dd4363d8ec990399f0e.png][]

==================================================================

===================================================================

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      <code>package</code>&nbsp; 
      <code>com.awaimai.web;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>org.hibernate.validator.constraints.*;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>org.springframework.validation.annotation.Validated;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>org.springframework.web.bind.annotation.*;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.servlet.http.Cookie;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.servlet.http.HttpServletRequest;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.servlet.http.HttpServletResponse;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.validation.constraints.Max;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.validation.constraints.Min;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>javax.validation.constraints.Size;</code> 
     </div> 
     <div> 
      <code>import</code>&nbsp; 
      <code>java.util.Enumeration;</code> 
     </div> 
     <div> 
      <code>@RestController</code> 
     </div> 
     <div> 
      <code>@Validated</code> 
     </div> 
     <div> 
      <code>public</code>&nbsp; 
      <code>class</code>&nbsp; 
      <code>kzq</code> 
     </div> 
     <div> 
      <code>{ </code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>@RequestMapping</code> 
      <code>(value = { </code> 
      <code>"/test4"</code> 
      <code>,</code> 
      <code>"/test5"</code> 
      <code>},method={RequestMethod.POST, RequestMethod.GET}, consumes={ </code> 
      <code>"application/json"</code> 
      <code>},&lt;br&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; produces={ </code> 
      <code>"application/json"</code> 
      <code>}, params={ </code> 
      <code>"name"</code> 
      <code>,</code> 
      <code>"pwd"</code> 
      <code>},headers={ </code> 
      <code>"a=1"</code> 
      <code>})</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>@ResponseBody</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>public</code>&nbsp; 
      <code>String test4()</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>{ </code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>return</code>&nbsp; 
      <code>"{\"id\":1}"</code> 
      <code>;</code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>}</code> 
     </div> 
     <div> 
      <code>}</code> 
     </div> 
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注意：两个参数未指定值

![4b9d04c6f030cbdd6bb4e1f60d093bcd.png][]

![bb912962342e01f8a898de949201bf4b.png][]

从中发现，两个参数必须携带，值是多少都可以。

![5fedc1ab90b3addcb3804a8f5452fbc2.png][]

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