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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("/errorCode") |
| @POST |
| @ApiResponses({ |
| @ApiResponse(code = 200, response = MultiResponse200.class, message = ""), |
| @ApiResponse(code = 400, response = MultiResponse400.class, message = ""), |
| @ApiResponse(code = 500, response = MultiResponse500.class, message = "")}) |
| public MultiResponse200 errorCode(MultiRequest request) { |
| if (request.getCode() == 400) { |
| MultiResponse400 r = new MultiResponse400(); |
| r.setCode(400); |
| r.setMessage("bad request"); |
| 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("internal error"); |
| throw new InvocationException(javax.ws.rs.core.Response.Status.INTERNAL_SERVER_ERROR, r); |
| } else { |
| MultiResponse200 r = new MultiResponse200(); |
| r.setCode(200); |
| r.setMessage("success result"); |
| 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("/errorCode") |
| @POST |
| @ApiResponses({ |
| @ApiResponse(code = 200, response = MultiResponse200.class, message = ""), |
| @ApiResponse(code = 400, response = MultiResponse400.class, message = ""), |
| @ApiResponse(code = 500, response = MultiResponse500.class, message = "")}) |
| @ResponseHeaders({@ResponseHeader(name = "x-code", 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("bad request"); |
| response.setStatus(Status.BAD_REQUEST); |
| response.setResult(new InvocationException(Status.BAD_REQUEST, r)); |
| response.setHeader("x-code", "400"); |
| } else if (request.getCode() == 500) { |
| MultiResponse500 r = new MultiResponse500(); |
| r.setCode(500); |
| r.setMessage("internal error"); |
| response.setStatus(Status.INTERNAL_SERVER_ERROR); |
| response.setResult(new InvocationException(Status.INTERNAL_SERVER_ERROR, r)); |
| response.setHeader("x-code", "500"); |
| } else { |
| MultiResponse200 r = new MultiResponse200(); |
| r.setCode(200); |
| r.setMessage("success result"); |
| response.setStatus(Status.OK); |
| response.setResult(r); |
| response.setHeader("x-code", "200"); |
| } |
| 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("/errorCodeWithHeaderJAXRS") |
| @POST |
| @ApiResponses({ |
| @ApiResponse(code = 200, response = MultiResponse200.class, message = ""), |
| @ApiResponse(code = 400, response = MultiResponse400.class, message = ""), |
| @ApiResponse(code = 500, response = MultiResponse500.class, message = "")}) |
| 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("x-code", "400") |
| .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("x-code", "500") |
| .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("x-code", "200") |
| .build(); |
| } |
| return response; |
| } |
| </code></pre> |
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