public class Student {

  private int id;

  private String name;

  private int age;

  //get set方法略

}

Student student = new Student(0, "Aaron", 24);

System.out.println(JSON.toJSONString(student,true));

{

"age":,

"id":,

"name":"Aaron"

}

SimplePropertyPreFilter filter = new SimplePropertyPreFilter(实体类.class, "字段1","字段2"); //字段为我们需要序列化的字段，如果实体类中没有改字段则不解析放弃该字段而不会报错。

SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Student.class, "id","age");

String jsonStu =JSON.toJSONString(students,filter);