java jsonfield_定制序列化之@JSONField的使用

fastjson支持多种方式定制序列化：

通过@JSONField定制序列化

通过@JSONType定制序列化

通过SerializeFilter定制序列化

通过ParseProcess定制反序列化

@JSONField的使用：

1. 利用@JSONField的format配置日期格式化，这个在上一篇文章有所展示。

2. 利用@JSONField的serialize指定字段不序列化：

package com.ant.jdk8.json;

import com.alibaba.fastjson.annotation.JSONField;

import java.util.Date;

public class User {

private String name;

@JSONField(serialize=false)

private int age;

@JSONField(format=”yyyy-MM-dd HH:mm:ss”)

private Date hireDate;

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 getHireDate() {

return hireDate;

}

public void setHireDate(Date hireDate) {

this.hireDate = hireDate;

}

public User(String name, int age, Date hireDate) {

this.name = name;

this.age = age;

this.hireDate = hireDate;

}

public User() {

}

}

package com.ant.jdk8.json;

import com.alibaba.fastjson.JSON;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

public class JsonDemo {

public static void main(String[] args) {

convertCollectionToJson();

}

public static void convertCollectionToJson(){

List userList = new ArrayList<>();

userList.add(new User(“tom”,20,new Date()));

userList.add(new User(“jack”,25,new Date()));

String jsonString = JSON.toJSONString(userList);

System.out.println(jsonString);

}

}

3. 利用@JSONField的ordinal指定序列化的顺序(这个特性需要1.1.42以上版本)：

package com.ant.jdk8.json;

import com.alibaba.fastjson.annotation.JSONField;

import java.util.Date;

public class User {

@JSONField(ordinal=3)

private String name;

@JSONField(ordinal=2)

private int age;

@JSONField(format=”yyyy-MM-dd HH:mm:ss”,ordinal = 1)

private Date hireDate;

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 getHireDate() {

return hireDate;

}

public void setHireDate(Date hireDate) {

this.hireDate = hireDate;

}

public User(String name, int age, Date hireDate) {

this.name = name;

this.age = age;

this.hireDate = hireDate;

}

public User() {

}

}

package com.ant.jdk8.json;

import com.alibaba.fastjson.JSON;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

public class JsonDemo {

public static void main(String[] args) {

convertCollectionToJson();

}

public static void convertCollectionToJson(){

List userList = new ArrayList<>();

userList.add(new User(“tom”,20,new Date()));

userList.add(new User(“jack”,25,new Date()));

String jsonString = JSON.toJSONString(userList);

System.out.println(jsonString);

}

}

4. 利用@JSONField的name指定字段的名称：

package com.ant.jdk8.json;

import com.alibaba.fastjson.annotation.JSONField;

import java.util.Date;

public class User {

@JSONField(ordinal=3,name=”username”)

private String name;

@JSONField(ordinal=2)

private int age;

@JSONField(format=”yyyy-MM-dd HH:mm:ss”,ordinal = 1)

private Date hireDate;

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 getHireDate() {

return hireDate;

}

public void setHireDate(Date hireDate) {

this.hireDate = hireDate;

}

public User(String name, int age, Date hireDate) {

this.name = name;

this.age = age;

this.hireDate = hireDate;

}

public User() {

}

}

package com.ant.jdk8.json;

import com.alibaba.fastjson.JSON;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

public class JsonDemo {

public static void main(String[] args) {

convertCollectionToJson();

}

public static void convertCollectionToJson(){

List userList = new ArrayList<>();

userList.add(new User(“tom”,20,new Date()));

userList.add(new User(“jack”,25,new Date()));

String jsonString = JSON.toJSONString(userList);

System.out.println(jsonString);

}

}