前言

• jdk8
• fastjson maven 坐標： <dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.75</version></dependency>

null值字段默認不輸出

import java.io.Serializable; import com.alibaba.fastjson.JSON;public class TestMain {public static void main(String[] args) {Person p = new Person("張三", null);System.out.println(JSON.toJSONString(p));}public static class Person implements Serializable {private static final long serialVersionUID = 1L;private String name;private Integer age;public Person(String name, Integer age) {this.setName(name);this.setAge(age);}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;}} }

執行結果：

{"name":"張三"}

null值字段輸出

import java.io.Serializable; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.serializer.SerializerFeature;public class TestMain {public static void main(String[] args) {Person p = new Person("張三", null);System.out.println(JSON.toJSONString(p, SerializerFeature.WriteMapNullValue));}public static class Person implements Serializable {private static final long serialVersionUID = 1L;private String name;private Integer age;public Person(String name, Integer age) {this.setName(name);this.setAge(age);}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;}} }

執行結果：

{"age":null,"name":"張三"}

總結

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