FastJson几种常用场景

素颜马尾好姑娘i 2022-03-07 07:34 359阅读 0赞

## JavaBean ##

package com.daily.json;
    
    import com.alibaba.fastjson.annotation.JSONField;
    
    import java.util.Date;
    
    public class Student {
    
        @JSONField(name = "NAME", ordinal = 3)
        private String name;
        @JSONField(ordinal = 2)
        private int age;
        @JSONField(format = "yyyy-MM-dd HH:mm:ss", ordinal = 1)
        private Date birthDay;
        @JSONField(serialize = false)
        private String addr;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public int getAge() {
            return age;
        }
    
        public void setAge(int age) {
            this.age = age;
        }
    
        public Date getBirthDay() {
            return birthDay;
        }
    
        public void setBirthDay(Date birthDay) {
            this.birthDay = birthDay;
        }
    
        public String getAddr() {
            return addr;
        }
    
        public void setAddr(String addr) {
            this.addr = addr;
        }
    }

## 测试类 ##

package com.daily.json;
    
    import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.TypeReference;
    import com.alibaba.fastjson.serializer.PropertyFilter;
    
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.List;
    
    public class TestFastJson {
    
        private static Student student;
        private static List<Student> studentList;
        static {
            student = new Student();
            student.setName("张三");
            student.setAge(18);
            student.setBirthDay(new Date());
            student.setAddr("湖南");
    
            studentList = new ArrayList<>();
            studentList.add(student);
            studentList.add(student);
        }
    
        private static PropertyFilter propertyFilter = (object, name, value) -> {
            if (name.equals("age") && value.equals(18)) {
                    return false;
            }
            return true;
        };
    
        public static void main(String[] args) {
            String studentStr = JSON.toJSONString(student);
            //转对象
            Student student1 = JSON.parseObject(studentStr, Student.class);
            Student student2 = JSON.parseObject(studentStr, new TypeReference<Student>() {});
            //转集合
            String studentListStr = JSON.toJSONString(studentList);
            List<Student> students = JSON.parseArray(studentListStr, Student.class);
            List<Student> students2 = JSON.parseObject(studentListStr, new TypeReference<List<Student>>() {
            });
            //过滤字段，默认过滤null
            String student3 = JSON.toJSONString(student, propertyFilter);
            System.out.println(student3);
        }
    }