如何使用GSON反序列化下面的JSON最新

Question

這是我的JSON：

{ 
    "date": "14", 
    "day": "1", 
    "hours": "16", 
    "minutes": "16", 
    "month": "6", 
    "seconds": "30", 
    "time": "1405325790674", 
    "timeInMicros": "1405325790674917", 
    "timezoneOffset": "-480", 
    "year": "114" 
    } 

這是我的代碼

Gson gson = new GsonBuilder().create(); 
gson.fromJson(json, Date.class); 

的錯誤是

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected a string but was BEGIN_OBJECT at line 1 column 2 
    at com.google.gson.Gson.fromJson(Gson.java:815) 
    at com.google.gson.Gson.fromJson(Gson.java:768) 
    at com.google.gson.Gson.fromJson(Gson.java:717) 
    at com.google.gson.Gson.fromJson(Gson.java:689) 
    at com.baidu.code.commit.TestConvertJson.test(TestConvertJson.java:26) 
    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:601) 
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) 
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) 
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) 
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) 
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) 
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) 
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) 
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) 
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309) 
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) 
    Caused by: java.lang.IllegalStateException: Expected a string but was BEGIN_OBJECT at line 1 column 2 
    at com.google.gson.stream.JsonReader.nextString(JsonReader.java:821) 
    at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:66) 
    at com.google.gson.internal.bind.DateTypeAdapter.read(DateTypeAdapter.java:41) 
    at com.google.gson.Gson.fromJson(Gson.java:803) 
    ... 28 more 

Answer 1

這不是java.util.Date 。你應該有一個Date類這樣

public class Date { 
private String date; 
private String day; 
private String hours; 
private String minutes; 
private String month; 
private String seconds; 
private String time; 
private String timeInMicros; 
private String timezoneOffset; 
private String year; 

// getters and setters 
} 

現在你可以從這個JSON消息得到Date對象。

String json="{\n" + 
      "\n" + 
      " \"date\":\"14\",\n" + 
      " \"day\":\"1\",\n" + 
      " \"hours\":\"16\",\n" + 
      " \"minutes\":\"16\",\n" + 
      " \"month\":\"6\",\n" + 
      " \"seconds\":\"30\",\n" + 
      " \"time\":\"1405325790674\",\n" + 
      " \"timeInMicros\":\"1405325790674917\",\n" + 
      " \"timezoneOffset\":\"-480\",\n" + 
      " \"year\":\"114\"\n" + 
      "\n" + 
      "}"; 

    Date date=new Gson().fromJson(json,Date.class);