消息找不到媒体类型=应用程序/json 的脚本阅读器

Question

我写了一个JAX-RS服务器和客户端都使用泽西岛。我想将我的实体集合发送到客户端，并执行了以下步骤：

1. 制作实体扩展Serializable
2. 编写了一个自定义提供程序并将其扩展为支持集合
3. 将实体和提供程序复制粘贴到客户端

我发出了一个请求，客户端在服务器端成功地处理了这个请求，但收到了一个错误:

org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyReader not found for media type=application/json, type=interface java.util.List, genericType=java.util.List<model.HotelsEntity>.
org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:225)
org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:149)
org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1124)
org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:853)
org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:812)
org.glassfish.jersey.client.ClientResponse.readEntity(ClientResponse.java:377)
org.glassfish.jersey.client.JerseyInvocation.translate(JerseyInvocation.java:813)
org.glassfish.jersey.client.JerseyInvocation.access$600(JerseyInvocation.java:90)
org.glassfish.jersey.client.JerseyInvocation$3.call(JerseyInvocation.java:693)
org.glassfish.jersey.internal.Errors.process(Errors.java:315)
org.glassfish.jersey.internal.Errors.process(Errors.java:297)
org.glassfish.jersey.internal.Errors.process(Errors.java:228)
org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:424)
org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:689)
org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:405)
org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:301)
service.HotelService.getHotels(HotelService.java:30)
actions.HotelAction.perform(HotelAction.java:42)
MainServlet.processResponse(MainServlet.java:33)
MainServlet.doPost(MainServlet.java:22)
javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

服务器：

    @GET
@Produces(MediaType.APPLICATION_JSON)
public Response getHotelsList(@QueryParam("startDate") String startDate,
                              @QueryParam("endDate") String endDate) {
    List<HotelsEntity> list = hotelService.getAll();
    return ResponseFactory.response(Response.Status.OK, list);
}

客户：

    GenericType<List<HotelsEntity>> genericType = new GenericType<List<HotelsEntity>>(){};
    WebTarget target = client.target(preparePath());
    List<HotelsEntity> hotels = target.request(MediaType.APPLICATION_JSON_TYPE).get(genericType);

提供商:

public class JsonProvider<T> implements MessageBodyReader<T>, MessageBodyWriter<T> {

@Override
public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
    return MediaType.APPLICATION_JSON.equals(mediaType.getType()) &&
            MediaType.APPLICATION_JSON.equals(mediaType.getSubtype());
}

@Override
public T readFrom(Class<T> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException, WebApplicationException {
    Gson gson = createGson();
    Reader reader = new InputStreamReader(entityStream, Charset.forName(Constants.UTF_8));
    return gson.fromJson(reader, genericType);
}

@Override
public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
    return MediaType.APPLICATION_JSON.equals(mediaType.getType()) &&
            MediaType.APPLICATION_JSON.equals(mediaType.getSubtype());
}

@Override
public long getSize(T t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
    return -1;
}

@Override
public void writeTo(T t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {
    Gson gson = createGson();
    JsonElement element = gson.toJsonTree(entityStream);
    Writer writer = null;
    try {
        writer = new OutputStreamWriter(entityStream, Charset.forName(Constants.UTF_8));
        gson.toJson(element, writer);
    } finally {
        if (writer != null) {
            writer.flush();
        }
    }
}

private Gson createGson() {
    return new GsonBuilder().setPrettyPrinting().create();
}

}

@Provider
public class JsonCollection extends JsonProvider<Collection<? extends HospitalityEntity>> {}

@Entity
@Table(name = "hotels", schema = "", catalog = "mydb")
public class HotelsEntity implements HospitalityEntity{
private int idHotel;
private String name;
private String region;
private String description;

@Id
@Column(name = "id_hotel")
public int getIdHotel() {
    return idHotel;
}

public void setIdHotel(int idHotel) {
    this.idHotel = idHotel;
}

@Basic
@Column(name = "name")
public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

@Basic
@Column(name = "region")
public String getRegion() {
    return region;
}

public void setRegion(String region) {
    this.region = region;
}

@Basic
@Column(name = "description")
public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}


@Override
public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    HotelsEntity that = (HotelsEntity) o;

    if (idHotel != that.idHotel) return false;
    if (description != null ? !description.equals(that.description) : that.description != null) return false;
    if (name != null ? !name.equals(that.name) : that.name != null) return false;
    if (region != null ? !region.equals(that.region) : that.region != null) return false;

    return true;
}

@Override
public int hashCode() {
    int result = idHotel;
    result = 31 * result + (name != null ? name.hashCode() : 0);
    result = 31 * result + (region != null ? region.hashCode() : 0);
    result = 31 * result + (description != null ? description.hashCode() : 0);
    return result;
}
}

Answer 1

您的实体类没有空的构造函数，这是JAX-RS解组所需要的。

在此处查看：

https://blogs.oracle.com/groundside/entry/jax_rs_2_0_messagebodyreader

Answer 2

很抱歉复活这篇文章，但我在Maven项目中遇到了这个问题，发现我需要在我的pom中包含杰克逊 -jaxrs-json-提供者的依赖关系：

<dependency>
    <groupId>com.fasterxml.jackson.jaxrs</groupId>
    <artifactId>jackson-jaxrs-json-provider</artifactId>
    <version>2.4.1</version>
</dependency>

MVN 存储库：http://mvnrepository.com/artifact/com.fasterxml.jackson.jaxrs/jackson-jaxrs-json-provider

Answer 3

您可以使用jersey json库：

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>2.22</version>
</dependency>

或玄关：

<dependency>
    <groupId>com.owlike</groupId>
    <artifactId>genson</artifactId>
    <version>1.3</version>
</dependency>