Gson处理子类和父类中有相同属性bean异常处理

Gson 2.0以后序列化和反序列化 子类和父类中具备相同属性的bean会抛异常“class XXX declares multiple JSON fields named XXX”， 大体的处理方法有： 一、删除 父类或子类 中重复的属性 二、用 transient 关键字 修饰 子类或父类中不须要序列化的字段 三、为这个类单独注册TypeAdapter 测试代码以下：

Person.class

public class Person {
    private String name;
    private String age;
    // ignore getter and setter
}

Student.class

public class Student extends Person {
    private String name;
    private String score;
    // ignore getter and setter
}

用gson处理student 会跑错以下

String _stu = "{'name':'test','score':'100','age':'20'}";
Gson gson = new GsonBuilder().create();
Student stu = gson.fromJson(_stu, Student.class);

StudentTypeAdapter.class

public class StudentTypeAdapter extends TypeAdapter<Student> {

    @Override
    public void write(JsonWriter out, Student value) throws IOException {
        out.beginObject();
        out.name("name").value(value.getName());
        out.name("age").value(value.getAge());
        out.name("score").value(value.getScore());
        out.endObject();
    }

    @Override
    public Student read(JsonReader in) throws IOException {
        Student student = new Student();
        in.beginObject();

        while (in.hasNext()) {
            String field = in.nextName();
            if ("name".equals(field)) {
                student.setName(in.nextString());
            } else if ("age".equals(field)) {
                student.setName(in.nextString());
            } else if ("score".equals(field)) {
                student.setScore(in.nextString());
            }else{
                in.skipValue();
            }
        }

        in.endObject();

        return student;
    }
}

这样运行就整常了

String _stu = "{'name':'test','score':'100','age':'20'}";
Gson gson = new GsonBuilder().registerTypeAdapter(Student.class, new StudentTypeAdapter()).create();
Student stu = gson.fromJson(_stu, Student.class);