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 <h1 id="_1">多个返回值和错误码</h1>
 <p>使用透明RPC开发服务提供者，开发者很容易理解一个接口只有一个返回值类型。使用REST风格（Spring MVC 或者 JAXRS），很多场景会碰到
 多个返回值和错误码的情况。和很多其他开发框架（比如Servlet、Spring MVC等）不一样，Java Chassis要求接口定义的返回值和错误码都
 必须显示的声明，即通过代码生成的swagger，必须包含所有的错误码描述和返回值类型描述。 在Java Chassis，无法使用隐藏参数、未声明
 的错误码。这样设计的直接好处是接口定义更加明确，不需要额外的文档帮助使用者理解接口的使用方法。 </p>
 <p>在前面的开发指导里面，主要介绍了一个返回值和一个错误码的情况（200）。 下面介绍如何使用多个错误码和返回值，同时会介绍如何返回额外的
 header参数。 </p>
 <p>Java Chassis将错误码进行了分类：2xx错误码认为是一个正常的响应，一个接口只允许存在一个正常响应错误码；
 其他错误码认为是一个异常的响应，一个接口可以定义多个异常的响应，并且需要采用InvocationException的方式将异常抛出，每个错误码可以指定
 不同的响应类型。 </p>
 <ul>
 <li>采用<code>ApiResponse</code>定义多个返回值和错误码</li>
 </ul>
 <pre><code class="language-java">@Path(&quot;/errorCode&quot;)
 @POST
 @ApiResponses({
   @ApiResponse(code = 200, response = MultiResponse200.class, message = &quot;&quot;),
   @ApiResponse(code = 400, response = MultiResponse400.class, message = &quot;&quot;),
   @ApiResponse(code = 500, response = MultiResponse500.class, message = &quot;&quot;)})
 public MultiResponse200 errorCode(MultiRequest request) {
     if (request.getCode() == 400) {
       MultiResponse400 r = new MultiResponse400();
       r.setCode(400);
       r.setMessage(&quot;bad request&quot;);
       throw new InvocationException(javax.ws.rs.core.Response.Status.BAD_REQUEST, r);
     } else if (request.getCode() == 500) {
       MultiResponse500 r = new MultiResponse500();
       r.setCode(500);
       r.setMessage(&quot;internal error&quot;);
       throw new InvocationException(javax.ws.rs.core.Response.Status.INTERNAL_SERVER_ERROR, r);
     } else {
       MultiResponse200 r = new MultiResponse200();
       r.setCode(200);
       r.setMessage(&quot;success result&quot;);
       return r;
     }
 }
 </code></pre>
 <ul>
 <li>采用 <code>org.apache.servicecomb.swagger.invocation.Response</code> 响应类型</li>
 </ul>
 <p>采用 <code>org.apache.servicecomb.swagger.invocation.Response</code> 响应类型，除了可以定义多个错误码和响应类型，还可以通过
 <code>ResponseHeader</code> 定义额外的响应头。 </p>
 <pre><code class="language-java">@Path(&quot;/errorCode&quot;)
 @POST
 @ApiResponses({
   @ApiResponse(code = 200, response = MultiResponse200.class, message = &quot;&quot;),
   @ApiResponse(code = 400, response = MultiResponse400.class, message = &quot;&quot;),
   @ApiResponse(code = 500, response = MultiResponse500.class, message = &quot;&quot;)})
 @ResponseHeaders({@ResponseHeader(name = &quot;x-code&quot;, response = String.class)})
 public Response errorCodeWithHeader(MultiRequest request) {
     Response response = new Response();
     if (request.getCode() == 400) {
       MultiResponse400 r = new MultiResponse400();
       r.setCode(400);
       r.setMessage(&quot;bad request&quot;);
       response.setStatus(Status.BAD_REQUEST);
       response.setResult(new InvocationException(Status.BAD_REQUEST, r));
       response.setHeader(&quot;x-code&quot;, &quot;400&quot;);
     } else if (request.getCode() == 500) {
       MultiResponse500 r = new MultiResponse500();
       r.setCode(500);
       r.setMessage(&quot;internal error&quot;);
       response.setStatus(Status.INTERNAL_SERVER_ERROR);
       response.setResult(new InvocationException(Status.INTERNAL_SERVER_ERROR, r));
       response.setHeader(&quot;x-code&quot;, &quot;500&quot;);
     } else {
       MultiResponse200 r = new MultiResponse200();
       r.setCode(200);
       r.setMessage(&quot;success result&quot;);
       response.setStatus(Status.OK);
       response.setResult(r);
       response.setHeader(&quot;x-code&quot;, &quot;200&quot;);
     }
     return response;
 }
 </code></pre>
 <ul>
 <li>采用 <code>javax.ws.rs.core.Response</code> 响应类型</li>
 </ul>
 <p>采用 <code>javax.ws.rs.core.Response</code> 响应类型，除了可以定义多个错误码和响应类型，还可以通过
 <code>ResponseHeader</code> 定义额外的响应头。 </p>
 <pre><code class="language-java">@Path(&quot;/errorCodeWithHeaderJAXRS&quot;)
 @POST
 @ApiResponses({
   @ApiResponse(code = 200, response = MultiResponse200.class, message = &quot;&quot;),
   @ApiResponse(code = 400, response = MultiResponse400.class, message = &quot;&quot;),
   @ApiResponse(code = 500, response = MultiResponse500.class, message = &quot;&quot;)})
 public javax.ws.rs.core.Response errorCodeWithHeaderJAXRS(MultiRequest request) {
     javax.ws.rs.core.Response response;
     if (request.getCode() == 400) {
       MultiResponse400 r = new MultiResponse400();
       r.setCode(request.getCode());
       r.setMessage(request.getMessage());
       response = javax.ws.rs.core.Response.status(Status.BAD_REQUEST)
           .entity(new InvocationException(Status.BAD_REQUEST, r))
           .header(&quot;x-code&quot;, &quot;400&quot;)
           .build();
     } else if (request.getCode() == 500) {
       MultiResponse500 r = new MultiResponse500();
       r.setCode(request.getCode());
       r.setMessage(request.getMessage());
       response = javax.ws.rs.core.Response.status(Status.INTERNAL_SERVER_ERROR)
           .entity(new InvocationException(Status.INTERNAL_SERVER_ERROR, r))
           .header(&quot;x-code&quot;, &quot;500&quot;)
           .build();
     } else {
       MultiResponse200 r = new MultiResponse200();
       r.setCode(request.getCode());
       r.setMessage(request.getMessage());
       // If error code is OK family(like 200), we can use the target type.
       response = javax.ws.rs.core.Response.status(Status.OK)
           .entity(r)
           .header(&quot;x-code&quot;, &quot;200&quot;)
           .build();
     }
     return response;
 }
 </code></pre>


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