package jsonArrayjsonObject.cn;

import java.io.Serializable;

import java.util.Date;

import com.alibaba.fastjson.annotation.JSONField;

import com.alibaba.fastjson.serializer.SerializerFeature;

public class User implements Serializable{

    private static final long serialVersionUID = 1L;

    // 配置序列化和反序列化的顺序，1.2.42以上版本支持。默认是以fieldName的字母序进行序列化的

    @JSONField(ordinal = 0)

    private Long id;

    @JSONField(ordinal = 1, name = "na")

    private String name;

    // 序列化与反序列化，默认均为true

    @JSONField(ordinal = 2, serialize = false, deserialize = false)

    private Integer age;

    // 默认序列化规则是当字段值为null时，是不序列化该字段的。当设置规则后，value为null时，依然会把它的值序列化出来

    @JSONField(ordinal = 3, serialzeFeatures = SerializerFeature.WriteMapNullValue)

    private String address;

    // 指定时间格式

    @JSONField(ordinal = 4, format = "yyyy-MM-dd  HH:mm:ss")

    private Date birthDate;

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public Integer getAge() {

        return age;

    }

    public void setAge(Integer age) {

        this.age = age;

    }

    public String getAddress() {

        return address;

    }

    public void setAddress(String address) {

        this.address = address;

    }

    public Date getBirthDate() {

        return birthDate;

    }

    public void setBirthDate(Date birthDate) {

        this.birthDate = birthDate;

    }

}

package jsonArrayjsonObject.cn;

import java.util.Date;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.serializer.SimplePropertyPreFilter;

public class Test {

    public static void main(String[] args) {

        test1();

    }

    // 测试SimplePropertyPreFilter 和 JsonField 注解

    static void test1(){

        User user = new User();

        user.setId(1L);

        user.setAge(12);

        user.setName("zhangsan");

        user.setBirthDate(new Date());

        SimplePropertyPreFilter filter = new SimplePropertyPreFilter(User.class, "na", "address");

        String jsonString1 = JSON.toJSONString(user);

        String jsonString2 = JSON.toJSONString(user, filter);

        System.out.println(jsonString1);

        System.out.println(jsonString2);

    }

}

{"id":1,"na":"zhangsan","address":null,"birthDate":"2018-01-08  14:24:28"}

{"na":"zhangsan","address":null}