澤西2.x後調用json輸入參數拋出MessageBodyProviderNotFoundException

Question

我嘗試從json直接映射到json。對於GET請求，這個過程很順利。對於POST請求發生異常。

資源的方法：

@GET 
@Path("testget") 
@Produces(MediaType.APPLICATION_JSON) 
public Response test(@Context HttpServletRequest request) { 
    Password password = new Password(); 
    password.setPassword("testpassword"); 
    return Response.status(Response.Status.OK).entity(password).build(); 
} 

@POST 
@Path("testpost") 
@Consumes(MediaType.APPLICATION_JSON) 
public Response test(Password password) { 
    return Response.status(Response.Status.OK).entity(password.getPassword()).build(); 
} 

客戶端：

Response reponse = target.request(MediaType.APPLICATION_JSON).get(); 

    Password password = new Password(); 
    password.setPassword("newTestPasswort"); 
    reponse = target.request(MediaType.APPLICATION_JSON).post(Entity.json(password)); 

例外：

SEVERE: MessageBodyWriter not found for media type=application/json,  type=class com.entities.Password, genericType=class  com.entities.Password. 
Exception in thread "main" org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyWriter not found for media type=application/json, type=class com.entities.Password, genericType=class com.entities.Password. 
    at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:247) 
    at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) 
    at org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1130) 
    at org.glassfish.jersey.client.ClientRequest.writeEntity(ClientRequest.java:502) 
    at org.glassfish.jersey.client.internal.HttpUrlConnector._apply(HttpUrlConnector.java:388) 
    at org.glassfish.jersey.client.internal.HttpUrlConnector.apply(HttpUrlConnector.java:285) 
    at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:255) 
    at org.glassfish.jersey.client.JerseyInvocation$1.call(JerseyInvocation.java:684) 
    at org.glassfish.jersey.client.JerseyInvocation$1.call(JerseyInvocation.java:681) 
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315) 
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297) 
    at org.glassfish.jersey.internal.Errors.process(Errors.java:228) 
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:444) 
    at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:681) 
    at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:437) 
    at org.glassfish.jersey.client.JerseyInvocation$Builder.post(JerseyInvocation.java:343) 
    at com.clientsql.RegistrationTest.setNewPassword(RegistrationTest.java:61) 
    at com.clientsql.RegistrationTest.main(RegistrationTest.java:44) 

依賴關係：

<dependency> 
     <groupId>org.glassfish.jersey.containers</groupId> 
     <artifactId>jersey-container-servlet</artifactId> 
     <version>2.23.1</version> 
    </dependency> 

對於映射我嘗試了各種依賴。對於每個只有獲取功能的作品：

<dependency> 
     <groupId>com.owlike</groupId> 
     <artifactId>genson</artifactId> 
     <version>1.4</version> 
</dependency> 

<!--  <dependency> 
    <groupId>org.glassfish.jersey.media</groupId> 
    <artifactId>jersey-media-json-jackson</artifactId> 
    <version>2.23.1</version> 
</dependency>--> 
<!--  <dependency> 
    <groupId>org.glassfish.jersey.media</groupId> 
    <artifactId>jersey-media-moxy</artifactId> 
    <version>2.23.1</version> 
</dependency>--> 

Answer 1

您需要告訴澤西島如何將對象轉換爲/從JSON。

支持JSON的球衣有多種方法。

看看官方澤西文檔不同的方法來支持JSON：https://jersey.java.net/documentation/latest/media.html#d0e7963

下面兩個是常見的方式做到這一點：

1. 基於JAXB JSON綁定支持

   添加@XmlRootElement POJO的註釋。

   @XmlRootElement 
   class EntityX { 
       // data 
   } 
   

2. 基於POJO的JSON綁定支持

   您需要註冊一個實現ContextResolver提供商。使用傑克遜你可以做到這一點。

   @Provider 
   @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML }) 
   public class JacksonContextResolver implements ContextResolver<ObjectMapper> { 
   
       private ObjectMapper objectMapper; 
   
       public JacksonContextResolver() throws Exception { 
        this.objectMapper = buildMapper(false); 
       } 
   
       public static ObjectMapper buildMapper(boolean indent) { 
        ObjectMapper objectMapper = new ObjectMapper(); 
        objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.ENGLISH)); 
        AnnotationIntrospector primary = new JacksonAnnotationIntrospector(); 
        AnnotationIntrospector secondary = new JaxbAnnotationIntrospector(); 
        AnnotationIntrospector pair = new AnnotationIntrospector.Pair(primary, secondary); 
   
        SerializationConfig sc = objectMapper.getSerializationConfig() 
         .withAnnotationIntrospector(pair) 
         .withSerializationInclusion(JsonSerialize.Inclusion.NON_NULL); 
        objectMapper.setSerializationConfig(sc); 
   
        if (indent) { 
         objectMapper.configure(SerializationConfig.Feature.INDENT_OUTPUT, true); 
        } 
   
        return objectMapper; 
       } 
   
       /** 
       * @see javax.ws.rs.ext.ContextResolver#getContext(java.lang.Class) 
       */ 
       public ObjectMapper getContext(Class<?> objectType) { 
        return objectMapper; 
       } 
   } 
   

   檢查此鏈接瞭解更多信息：https://jersey.java.net/documentation/latest/media.html#json.jackson