java - Java 应用程序中的 Jersey restful web 服务使用 Postman 插件发送复杂对象进行测试

Question

我用 jersey 1.8 库创建了一个 java restful ws，它是一个名为 Loc 的 Pojo 的后操作，使用 JSON 格式。

这是网络服务:

import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import org.hibernate.Session;
import org.hibernate.Transaction;

import persistence.HibernateUtil;
import entities.Loc;

@Path("EnvironmentService")
public class Environment {


    @POST
    @Path("/post/location")
    @Consumes(MediaType.APPLICATION_JSON)
    public Response createLocation(Loc location) {

        System.out.println("ENTROU NO LOCATION");

        Session session = HibernateUtil.openNewSession();
        Transaction tx = session.beginTransaction();

        session.save(location);

        tx.commit();
        session.close();

        String result = "Location saved";
        return Response.status(201).entity(result).build();
    } 

我想向网络服务发送一个 Loc 对象:

/**
 * Loc is a hibernate enitity class which represents a raw data table for location entries.*/

@Entity
@XmlRootElement
public class Loc implements Serializable {

    private static final long serialVersionUID = 1184003645439013748L;

    @Id
    @GeneratedValue(strategy = GenerationType.TABLE)
    private long id;
    private double latitude;
    private double longitude;
    private long time;
    private double accuracy;
    private String provider;
    @Column(name = "yProcessed", nullable = false, columnDefinition = "int default '0'")
    private int yProcessed = 0;
    @Column(name = "zClass", nullable = false, columnDefinition = "double default 0.0")
    private double zClass = 0d;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public double getLatitude() {
        return this.latitude;
    }

    public void setLatitude(double latitude) {
        this.latitude = latitude;
    }

    public double getLongitude() {
        return this.longitude;
    }

    public void setLongitude(double longitude) {
        this.longitude = longitude;
    }

    public long getTime() {
        return this.time;
    }

    public void setTime(long time) {
        this.time = time;
    }

    @Override
    public String toString() {
        return "latitude: " + latitude + " longitude: " + longitude + "time: "
                + time;
    }

    public double getAccuracy() {
        return accuracy;
    }

    public void setAccuracy(double accuracy) {
        this.accuracy = accuracy;
    }

    public int getyProcessed() {
        return yProcessed;
    }

    public void setyProcessed(int yProcessed) {
        this.yProcessed = yProcessed;
    }

    public double getzClass() {
        return zClass;
    }

    public void setzClass(double zClass) {
        this.zClass = zClass;
    }

    public String getProvider() {
        return provider;
    }
    public void setProvider(String provider) {
        this.provider = provider;
    }
}

这是我用于 Jersey 配置的 web.xml 文件，我使用的 jar 是 1.8:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">
    <display-name>RememberMeServer</display-name>
    <servlet>
        <servlet-name>Jersey REST Service</servlet-name>
        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>com.sun.jersey.config.property.packages</param-name>
            <param-value>webservices</param-value>
        </init-param>
        <init-param>
            <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
            <param-value>true</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>Jersey REST Service</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
</web-app> 

我正在使用 chrome 中的 postman 插件测试这个网络服务。

我给他以下 url http://localhost:8080/RememberMeServer/rest/EnvironmentService/post/location

这是正确的。

我将以下 header 传递给他:

Content-Type application/json

并选择 raw 和 JSON 类型格式并发送以下 JSON 代码使用 GSON 从 Loc 对象收集:

{"provider":"network","latitude":39.1237894,"longitude":-9.2501239,"accuracy":34.5,"time":1400957412206}

在 Postman 插件中我得到了 415: UnsupportedMediaType 并且在 eclipse 中我得到了这个 jersey 错误:

Mai 25, 2014 12:49:42 PM com.sun.jersey.spi.container.ContainerRequest getEntity
SEVERE: A message body reader for Java class entities.Loc, and Java type class entities.Loc, and MIME media type application/json was not found.
The registered message body readers compatible with the MIME media type are:
application/json ->
  com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$App
  com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$App
  com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$App
*/* ->
  com.sun.jersey.core.impl.provider.entity.FormProvider
  com.sun.jersey.core.impl.provider.entity.MimeMultipartProvider
  com.sun.jersey.core.impl.provider.entity.StringProvider
  com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
  com.sun.jersey.core.impl.provider.entity.FileProvider
  com.sun.jersey.core.impl.provider.entity.InputStreamProvider
  com.sun.jersey.core.impl.provider.entity.DataSourceProvider
  com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
  com.sun.jersey.core.impl.provider.entity.ReaderProvider
  com.sun.jersey.core.impl.provider.entity.DocumentProvider
  com.sun.jersey.core.impl.provider.entity.SourceProvider$StreamSourceReader
  com.sun.jersey.core.impl.provider.entity.SourceProvider$SAXSourceReader
  com.sun.jersey.core.impl.provider.entity.SourceProvider$DOMSourceReader
  com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$General
  com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General
  com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General
  com.sun.jersey.core.impl.provider.entity.XMLRootObjectProvider$General
  com.sun.jersey.core.impl.provider.entity.EntityHolderReader
  com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$General
  com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$General

根据我对实体的理解，这很奇怪。Loc 应该在这里的某个地方，但它不是。

类 Loc 中的一些注解是针对 Hibernate Framework 的，与 web 服务无关。我认为他们不会干涉。

我不知道如何解决这个问题我想先测试这个网络服务，然后再去客户端。有谁知道如何解决这个问题？

编辑:

这是 postman 中的请求预览:

POST /RememberMeServer/rest/EnvironmentService/post/location HTTP/1.1
Host: localhost:8080
Content-Type: application/json
Cache-Control: no-cache

{"provider":"network","latitude":"39.1237894","longitude":"-9.2501239","accuracy":"34.5","time":"1400957412206"}

EDIT2

当我将类型更改为 text/plain 并将参数更改为字符串时，它起作用了，我认为问题在于将 json 字符串映射到 Loc 对象有什么帮助吗？

编辑 3:

现在我在 post webservice 中将类型更改为字符串，他收到的 json 非常好，但我如何使用 Loc 对象而不是字符串来做到这一点？

EDIT4

通过添加 Genson 有一个用户建议实际上将错误更改为内部服务器错误这里是堆栈跟踪:

Mai 28, 2014 2:12:26 PM com.sun.jersey.spi.container.ContainerResponse logException
SEVERE: Mapped exception to response: 500 (Internal Server Error)
javax.ws.rs.WebApplicationException: com.owlike.genson.JsonBindingException: Could not deserialize to type class java.lang.String
    at com.owlike.genson.ext.jaxrs.GensonJsonConverter.readFrom(GensonJsonConverter.java:127)
    at com.sun.jersey.spi.container.ContainerRequest.getEntity(ContainerRequest.java:490)
    at com.sun.jersey.server.impl.model.method.dispatch.EntityParamDispatchProvider$EntityInjectable.getValue(EntityParamDispatchProvider.java:123)
    at com.sun.jersey.server.impl.inject.InjectableValuesProvider.getInjectableValues(InjectableValuesProvider.java:86)
    at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$EntityParamInInvoker.getParams(AbstractResourceMethodDispatchProvider.java:153)
    at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:203)
    at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
    at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
    at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
    at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:540)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:715)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
Caused by: com.owlike.genson.JsonBindingException: Could not deserialize to type class java.lang.String
    at com.owlike.genson.Genson.deserialize(Genson.java:442)
    at com.owlike.genson.ext.jaxrs.GensonJsonConverter.readFrom(GensonJsonConverter.java:125)
    ... 38 more
Caused by: com.owlike.genson.stream.JsonStreamException: Readen value can not be converted to String
    at com.owlike.genson.stream.JsonReader.valueAsString(JsonReader.java:193)
    at com.owlike.genson.convert.DefaultConverters$StringConverter.deserialize(DefaultConverters.java:282)
    at com.owlike.genson.convert.DefaultConverters$StringConverter.deserialize(DefaultConverters.java:269)
    at com.owlike.genson.convert.NullConverter$NullConverterWrapper.deserialize(NullConverter.java:57)
    at com.owlike.genson.Genson.deserialize(Genson.java:440)
    ... 39 more

Answer 1

确实，问题在于 Jersey 不知道如何将 json 映射到您的对象。

您可以使用 Genson ，当它在您的类路径中时，Jersey 将自动启用 JSON 序列化/反序列化。