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| <h1 id="_1">返回值序列化扩展</h1> |
| <h2 id="_2">概念阐述</h2> |
| <p>当前REST通道返回值支持application/json和text/plain两种格式，支持开发人员扩展和重写，服务提供者通过produces声明可提供序列化能力，服务消费者通过请求的Accept头指明返回值序列化方式，默认返回application/json格式的数据。</p> |
| <h2 id="_3">开发说明</h2> |
| <ul> |
| <li> |
| <h3 id="_4">扩展</h3> |
| </li> |
| </ul> |
| <p>开发人员可以根据业务需要，通过编程的方式来扩展返回值序列化方式。实施步骤如下，以扩展支持application/xml格式为例：</p> |
| <p>1.实现接口<code>ProduceProcessor</code></p> |
| <blockquote> |
| <p>getName()返回当前扩展的数据类型名</p> |
| <p>getOrder()返回当前数据类型优先级，有多个同名实现类时生效，只加载优先级最高的，数字越小优先级越高</p> |
| <p>doEncodeResponse(OutputStream output, Object result)把result对象编码成output，此处逻辑需要自行实现</p> |
| <p>doDecodeResponse(InputStream input, JavaType type)把input解析成相应对象，此处逻辑需要自行实现</p> |
| </blockquote> |
| <p>```java |
| public class ProduceAppXmlProcessor implements ProduceProcessor {</p> |
| <pre><code>@Override |
| public String getName() { |
| return MediaType.APPLICATION_XML; |
| } |
| |
| @Override |
| public int getOrder() { |
| return 0; |
| } |
| |
| @Override |
| public void doEncodeResponse(OutputStream output, Object result) throws Exception { |
| output.write(JAXBUtils.convertToXml(result).getBytes()); |
| } |
| |
| @Override |
| public Object doDecodeResponse(InputStream input, JavaType type) throws Exception { |
| return JAXBUtils.convertToJavaBean(input, type); |
| } |
| </code></pre> |
| <p>} |
| ```</p> |
| <p>2.添加配置文件</p> |
| <p>在resources下META-INF/services/文件夹新建文件xxx.ProduceProcessor（xxx为接口的包名），内容填写xxx.ProduceAppXmlProcessor（xxx为实现类的包名）。</p> |
| <ul> |
| <li> |
| <h3 id="_5">重写</h3> |
| </li> |
| </ul> |
| <p>开发人员可以对现有的application/json和text/plain两种格式实现逻辑进行重写，也可以对自行扩展的格式进行重写，以重写xml序列化方式为例：</p> |
| <p>1.创建一个同名类<code>ProduceAppXmlProcessor</code>，实现接口<code>ProduceProcessor</code></p> |
| <p>2.重写<code>doEncodeResponse</code>和<code>doDecodeResponse</code>方法里的编解码逻辑</p> |
| <p>3.更改getOrder方法里的返回值，要比原方法的返回值小，例如返回-1，application/json和text/plain的原方法返回值默认都为0</p> |
| <p>4.在resources下META-INF/services/文件夹新建文件xxx.ProduceProcessor（xxx为接口的包名），内容填写xxx.ProduceAppXmlProcessor（xxx为实现类的包名）。</p> |
| <ul> |
| <li> |
| <h3 id="_6">验证</h3> |
| </li> |
| </ul> |
| <p>服务提供者通过produces声明可提供xml序列化能力</p> |
| <p><code>java |
| @RequestMapping(path = "/appXml", method = RequestMethod.POST, produces = MediaType.APPLICATION_XML_VALUE) |
| public JAXBPerson appXml(@RequestBody JAXBPerson person) { |
| return person; |
| }</code></p> |
| <p>服务消费者通过请求的Accept头指明返回值xml序列化方式</p> |
| <p><code>java |
| private void testCodeFirstAppXml(RestTemplate template, String cseUrlPrefix) { |
| JAXBPerson person = new JAXBPerson("jake", 22, "it", "60kg"); |
| person.setJob(new JAXBJob("developer", "coding")); |
| HttpHeaders headers = new HttpHeaders(); |
| headers.add("Accept", MediaType.APPLICATION_XML_VALUE); |
| HttpEntity<JAXBPerson> requestEntity = new HttpEntity<>(person, headers); |
| ResponseEntity<JAXBPerson> resEntity = template.exchange(cseUrlPrefix + "appXml", |
| HttpMethod.POST, |
| requestEntity, |
| JAXBPerson.class); |
| TestMgr.check(person, resEntity.getBody()); |
| }</code></p> |
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