如何在 Jersey 客户端中默认使用 Genson 提供程序？

Question

我有一个基于 Jersey 框架的简单客户端。
我想使用 Genson 作为默认 JSON 提供商。
首先我创建了一些 class 实现了 ContextResolver:

@Provider
public class GensonCustomResolver implements ContextResolver<Genson> {

    private final Genson genson = new Genson.Builder().setSkipNull(true).setDateFormat(new UtcDateFormat()).create();

    @Override
    public Genson getContext(Class<?> type) {
        return genson;
    }
}

和 UtcDateFormat class:

public class UtcDateFormat extends DateFormat {
    @Override
    public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition) {
        return new StringBuffer("" + date.getTime());
    }

    @Override
    public Date parse(String source, ParsePosition pos) {
        return new Date(Long.parseLong(source));
    }
}

然后我用了这个：

ClientConfig cfg = new DefaultClientConfig(GensonCustomResolver.class);
Client client = Client.create(cfg);

Integer meetingId = 1;

Meeting result = client.resource("http://mywebservise.com/").path("meeting")
.path(meetingId.toString()).get(ClientResponse.class).getEntity(Meeting.class);

但是，失败了。这是日志：

javax.ws.rs.WebApplicationException: com.owlike.genson.TransformationException: Could not deserialize to property 'created' of class class com.mypack.model.Meeting
    at com.owlike.genson.ext.jaxrs.GensonJsonConverter.readFrom(GensonJsonConverter.java:127)
    at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:565)
    at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:517)
    at com.mypack.ws.MeetingsTest.getItem(MeetingsTest.java:159)
    at com.mypack.ws.MeetingsTest.getItem(MeetingsTest.java:68)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:659)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:845)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1153)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
    at org.testng.TestRunner.privateRun(TestRunner.java:771)
    at org.testng.TestRunner.run(TestRunner.java:621)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
    at org.testng.SuiteRunner.run(SuiteRunner.java:259)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1199)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1124)
    at org.testng.TestNG.run(TestNG.java:1032)
    at org.gradle.api.internal.tasks.testing.testng.TestNGTestClassProcessor.stop(TestNGTestClassProcessor.java:110)
    at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.stop(SuiteTestClassProcessor.java:58)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.messaging.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
    at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
    at com.sun.proxy.$Proxy2.stop(Unknown Source)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.stop(TestWorker.java:113)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.messaging.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:355)
    at org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl.run(DefaultExecutorFactory.java:66)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: com.owlike.genson.TransformationException: Could not deserialize to property 'created' of class class com.mypack.model.Meeting
    at com.owlike.genson.reflect.PropertyMutator.couldNotDeserialize(PropertyMutator.java:56)
    at com.owlike.genson.reflect.PropertyMutator.deserialize(PropertyMutator.java:39)
    at com.owlike.genson.reflect.BeanDescriptor.deserialize(BeanDescriptor.java:116)
    at com.owlike.genson.reflect.BeanDescriptor.deserialize(BeanDescriptor.java:98)
    at com.owlike.genson.convert.NullConverter$NullConverterWrapper.deserialize(NullConverter.java:61)
    at com.owlike.genson.Genson.deserialize(Genson.java:452)
    at com.owlike.genson.ext.jaxrs.GensonJsonConverter.readFrom(GensonJsonConverter.java:125)
    ... 48 more
Caused by: com.owlike.genson.TransformationException: Could not parse date 1432800716000
    at com.owlike.genson.convert.DefaultConverters$DateConverter.deserialize(DefaultConverters.java:824)
    at com.owlike.genson.convert.DefaultConverters$DateConverter.deserialize(DefaultConverters.java:788)
    at com.owlike.genson.convert.NullConverter$NullConverterWrapper.deserialize(NullConverter.java:61)
    at com.owlike.genson.reflect.PropertyMutator.deserialize(PropertyMutator.java:37)
    ... 53 more
Caused by: java.text.ParseException: Unparseable date: "1432800716000"
    at java.text.DateFormat.parse(DateFormat.java:357)
    at com.owlike.genson.convert.DefaultConverters$DateConverter.read(DefaultConverters.java:830)
    at com.owlike.genson.convert.DefaultConverters$DateConverter.deserialize(DefaultConverters.java:822)
    ... 56 more

怎么了？
P.S。泽西客户端 1.8
杰森 0.98

Answer 1

您应该升级到最新的 Genson 版本，有一些改进并且 providing a custom instance 球衣更容易。

在较新的版本中，Genson 会自动检测输入的是以毫秒为单位的时间还是日期字符串，并相应地进行处理。

在反序列化期间将使用使用 useDateFormat(...) 注册的日期格式，但这也会将日期序列化为字符串。如果你想将它们序列化为 long（这是新版本中的默认设置），你已经用 useDateAsTimestamp(true) 定义了它。

我希望这能让事情更清楚一些。您可以查看 the config options 了解更多详情。

如何在 Jersey 客户端中默认使用 Genson 提供程序？

How to use Genson provider as default in Jersey client?

java

jersey-client

genson