[英]Java json getting data from url to jcombobox
İ正在尝试在netbeans上开发swing应用。İ正在使用gson解码json.İ从php站点获取json数据。 İ无法将json数据转换为java数组。
我如何将获取json文件转换为Java数组。 然后,İ需要将jcombobox数据源设置为此数组。
我的json文件在URL上这样
[
{
"id": "1",
"ad": "jack",
"latitude": "41.0000",
"longitude": "32.000",
"speed": "",
"hour": "01:28:56",
"day": "18.04.2016",
"adres": "adres",
"resimyol": "http:\/\/maps.google.com\/maps\/api\/staticmap?.jpg"
},
{
"id": "2",
"ad": "Abraham",
"latitude": "41.0000",
"longitude": "41.0000",
"speed": "",
"hour": "01:28:56",
"day": "18.04.2016",
"adres": "adres",
"resimyol": "http:\/\/maps.google.com\/maps\/api\/staticmap?.jpg"
}
]
这是我的java文件
public class JsonPojo {
public String id;
public String ad;
public String latitude;
public String longitude;
public String speed;
public String hour;
public String day;
public String adres;
public String resimyol;
public String getId() { return id; }
public String getName() { return ad; }
public String getlat() { return latitude; }
public String getlon() { return longitude; }
public String getspeed() { return speed; }
public String gethour() { return hour; }
public String getday() { return day; }
public String getadres() { return adres; }
public String getresim() { return resimyol; }
}
public static void main(String args[]) {
// got json here...
Gson gson = new Gson();
JsonPojo[] array = gson.fromJson(gson, JsonPojo[].class);
JsonPojo obj = new Gson().fromJson(json, JsonPojo.class);
System.out.println("ID: " +obj.getId());
System.out.println("ID: " +obj.getName());
System.out.println("ID: " +obj.getlat());
System.out.println("ID: " +obj.getlon());
System.out.println("ID: " +obj.getspeed());
System.out.println("ID: " +obj.gethour());
System.out.println("ID: " +obj.getday());
System.out.println("ID: " +obj.getadres());
System.out.println("ID: " +obj.getresim());
}
我什么时候尝试运行项目,给我这样的错误
Exception in thread "AWT-EventQueue-0" com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 2 column 13 path $
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:224)
at com.google.gson.Gson.fromJson(Gson.java:887)
at com.google.gson.Gson.fromJson(Gson.java:852)
at com.google.gson.Gson.fromJson(Gson.java:801)
at com.google.gson.Gson.fromJson(Gson.java:773)
at KonumGoster$1.run(KonumGoster.java:145)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 2 column 13 path $
at com.google.gson.stream.JsonReader.beginObject(JsonReader.java:385)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:213)
... 19 more
BUILD SUCCESSFUL (total time: 5 minutes 5 seconds)
问题是您试图将gson
对象作为JSON传递。 而且,您也不需要第二次调用就可以尝试获取一个JsonPojo
,这将不起作用。
Gson gson = new Gson();
JsonPojo[] array = gson.fromJson(gson, JsonPojo[].class);
JsonPojo obj = new Gson().fromJson(json, JsonPojo.class);
应该是这样的:
Gson gson = new Gson();
JsonPojo[] array = gson.fromJson(json, JsonPojo[].class);
您将拥有一组对象,并且可以对其进行迭代。
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