仅在不为null或不为空的情况下，Gson序列化字段

创建自己的

TypeAdapter

public class MyTypeAdapter extends TypeAdapter<TestObject>() {    @Override    public void write(JsonWriter out, TestObject value) throws IOException {        out.beginObject();        if (!Strings.isNullOrEmpty(value.test1)) { out.name("test1"); out.value(value.test1);        }        if (!Strings.isNullOrEmpty(value.test2)) { out.name("test2"); out.value(value.test1);        }              out.endObject();        }    @Override    public TestObject read(JsonReader in) throws IOException {        // do something similar, but the other way around    }}

然后，您可以使用进行注册

Gson

Gson gson = new GsonBuilder().registerTypeAdapter(TestObject.class, new MyTypeAdapter()).create();TestObject obj = new TestObject();obj.test1 = "test1";obj.test2 = "";System.out.println(gson.toJson(obj));

产生

 {"test1":"test1"}

该

GsonBuilder

Strings