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我用过genson有一种方法可以将复杂的数据对象发送到java应用程序中的jersey rest webservices。

虽然当我尝试发送浮点数时，我收到以下错误：

Mai 29, 2014 9:56:47 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 entities.Accelerometer
    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$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$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 entities.Accelerometer
    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.JsonBindingException: Could not deserialize to property 'y' of class class entities.Accelerometer
    at com.owlike.genson.reflect.PropertyMutator.couldNotDeserialize(PropertyMutator.java:49)
    at com.owlike.genson.reflect.PropertyMutator.deserialize(PropertyMutator.java:32)
    at com.owlike.genson.reflect.BeanDescriptor.deserialize(BeanDescriptor.java:110)
    at com.owlike.genson.reflect.BeanDescriptor.deserialize(BeanDescriptor.java:93)
    at com.owlike.genson.convert.BeanViewConverter.deserialize(BeanViewConverter.java:105)
    at com.owlike.genson.convert.NullConverter$NullConverterWrapper.deserialize(NullConverter.java:57)
    at com.owlike.genson.Genson.deserialize(Genson.java:440)
    ... 39 more
Caused by: com.owlike.genson.JsonBindingException: No constructor has been found for type float
    at com.owlike.genson.reflect.BeanDescriptor.deserialize(BeanDescriptor.java:96)
    at com.owlike.genson.convert.BeanViewConverter.deserialize(BeanViewConverter.java:105)
    at com.owlike.genson.convert.NullConverter$NullConverterWrapper.deserialize(NullConverter.java:57)
    at com.owlike.genson.reflect.PropertyMutator.deserialize(PropertyMutator.java:30)

加速度计是我要传递的类，它有一个参数，即 y，它的类型是浮点数。这个错误是什么？

这是加速度计类：

@Entity
public class Accelerometer implements Serializable {


    private static final long serialVersionUID = -4328956850876279601L;

    @Id
    @GeneratedValue(strategy = GenerationType.TABLE)
    private long id;
    private float x;
    private float y;
    private float z;
    private long time;
    @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 Accelerometer(){

    }

    public long getId() {
        return id;
    }

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

    public float getX() {
        return x;
    }

    public void setX(
            float x) {
        this.x = x;
    }

    public float getY() {
        return y;
    }

    public void setY(
            float y) {
        this.y = y;
    }

    public float getZ() {
        return z;
    }

    public void setZ(
            float z) {
        this.z = z;
    }

    public long getTime() {
        return time;
    }

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

我传递的json如下：

{"time":1401398020864,"zClass":0.0,"y":-0.7086837,"yProcessed":0,"z":9.002198,"x":0.45968673}

这应该可以，我在这个 y 领域遇到了问题。我不明白，我发送的位置也有 - 纬度或经度字段，但它们是双倍的。浮动不能有-？

4

1 回答 1

1

在 Genson 0.99 中，缺少用于 float 和 short 的转换器。

它们已在 1.0 版本中添加（但仍在开发中）。要暂时解决问题，您可以使用 double 而不是 float （简单的解决方案）或提供转换器：

@HandleClassMetadata
@WithoutBeanView
public final static class FloatConverter implements Converter<Float> {

    public Float deserialize(ObjectReader reader, Context ctx) {
        return reader.valueAsFloat();
    }

    public void serialize(Float obj, ObjectWriter writer, Context ctx) {
        writer.writeValue(obj.floatValue());
    }
}

然后您需要注册它并向 Jersey 提供您的自定义 Genson 配置：

@Provider
public class GensonCustomResolver implements ContextResolver<Genson> {
  // configure the Genson instance
  private final Genson genson = new Genson.Builder().withConverter(new FloatConverter()).with(new JAXBBundle()).create();

  @Override
  public Genson getContext(Class<?> type) {
      return genson;
  }
}
于 2014-05-30T12:55:24.013 回答