如何为json响应实现MessageBodyWriter方法writeTo？ [英] how to implement MessageBodyWriter method writeTo for json response?
问题描述
如何配置 writeTo 方法，以便将详细信息转换为json响应。
How should I configure writeTo method so that it convert detail to json response .
@Override
public void writeTo(Detail detail, Class<?> type, Type genericType, Annotation[] annotation, MediaType mediaType,
MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException
{
try {
JAXBContext jaxbContext = JAXBContext.newInstance(detail.getClass());
// serialize the entity myBean to the entity output stream
jaxbContext.createMarshaller().marshal(detail, entityStream);
} catch (JAXBException jaxbException) {
jaxbException.printStackTrace();
throw new ProcessingException(
"Error serializing a "+ detail +" to the output stream", jaxbException);
}
}
但是现在我得到 XML 来自它的响应。
Yet now I am getting XML response from it.
我的资源代码是：
@POST
@Produces({MediaType.APPLICATION_JSON})
@Path("testDetail")
public TestDetail testDetail()
{
TestDetail testDetail = new TestDetail();
return testDetail;
}
推荐答案
你为什么要写自己的 MessageBodyWriter JSON？不要重新发明轮子。
Why are you writing your own MessageBodyWriter for JSON? Don't reinvent the wheel.
使用一个与Jersey集成的JSON提供程序，它将为您提供 MessageBodyWriter 实施。在撰写本文时，Jersey集成了以下模块以提供JSON支持：
Use one JSON provider that integrates with Jersey and it will provide you a MessageBodyWriter implementation. At time of writing, Jersey integrates with the following modules to provide JSON support:
- MOXy
- Java API for JSON Processing (JSON-P)
- Jackson
- Jettison
请参阅下面使用Jackson作为Jersey 2.x的JSON提供者所需的步骤：
See below the steps required to use Jackson as a JSON provider for Jersey 2.x:
添加Jackson模块依赖项
要使用Jackson 2.x作为您的JSON提供程序，您需要添加 jersey-media-json-jackson 模块到 pom.xml file：
To use Jackson 2.x as your JSON provider you need to add jersey-media-json-jackson module to your pom.xml file:
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
<version>2.23.1</version>
</dependency>
使用Jackson 1.x它看起来像：
To use Jackson 1.x it'll look like:
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson1</artifactId>
<version>2.23.1</version>
</dependency>
注册Jackson模块
除了添加上述依赖项外，您还需要注册 JacksonFeature （或 Jackson1xature //jersey.java.net/apidocs/2.23.1/jersey/javax/ws/rs/core/Application.html\"rel =nofollow> 应用程序 / ResourceConfig 子类：
Besides adding the dependency mentioned above, you need to register JacksonFeature (or Jackson1Feature for Jackson 1.x) in your Application/ResourceConfig sub-class:
@ApplicationPath("/api")
public class MyApplication extends Application {
@Override
public Set<Class<?>> getClasses() {
Set<Class<?>> classes = new HashSet<Class<?>>();
classes.add(JacksonFeature.class);
return classes;
}
}
@ApplicationPath("/api")
public class MyApplication extends ResourceConfig {
public MyApplication() {
register(JacksonFeature.class);
}
}
如果你没有 申请 / ResourceConfig 子类，你可以注册 web.xml 中的jersey / jackson / JacksonFeature.htmlrel =nofollow> JacksonFeature 部署描述符。特定资源，提供者和功能完全限定的类名称可以在逗号分隔值中提供 jersey.config.server.provider.classnames 初始化参数。
If you don't have an Application/ResourceConfig sub-class, you can register the JacksonFeature in your web.xml deployment descriptor. The specific resource, provider and feature fully-qualified class names can be provided in a comma-separated value of jersey.config.server.provider.classnames initialization parameter.
<init-param>
<param-name>jersey.config.server.provider.classnames</param-name>
<param-value>org.glassfish.jersey.jackson.JacksonFeature</param-value>
</init-param>
MessageBodyWriter JacksonJsonProvider 。
有关详细信息，请查看Jersey 文档，关于对常见媒体类型表示的支持。
For more details, check the Jersey documentation about support for common media type representations.
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