相关疑难解决方法(0)

为什么Java有瞬态字段？

我想序列化特定字段或类的空值.

在GSON中,该选项serializeNulls()适用于整个JSON.

例:

class MainClass {
    public String id;
    public String name;
    public Test test;
}

class Test {
    public String name;
    public String value;    
} 

MainClass mainClass = new MainClass();
mainClass.id = "101"
// mainClass has no name.
Test test = new Test();
test.name = "testName";
test.value = null;
mainClass.test = test;    

使用GSON创建JSON:

GsonBuilder builder = new GsonBuilder().serializeNulls();
Gson gson = builder.create();
System.out.println(gson.toJson(mainClass));

当前输出:

{
    "id": "101",
    "name": null,
    "test": {
        "name": "testName",
        "value": null
    }
} …