Java转JSON串的几种方式

﹏ヽ暗。殇╰゛Y 2022-03-18 07:10 934阅读 0赞

以下总结一下java转JSON串的几种方式：

1、将java对象转成json串

2、通过JSONObject生成json串

3、通过json字符串生成json串

代码通过阿里的fastjson包实现。

代码如下：

1、Person类，包含Crad的List

package com.doit8.test.jsontest.pojo;

import java.util.ArrayList;

import java.util.List;

public class Person \{

private String username;

private String email;

private String sex;

private int age;

private List cardList=new ArrayList();

public String getUsername() \{

return username;

public void setUsername(String username) \{

this.username = username;

public String getEmail() \{

return email;

public void setEmail(String email) \{

this.email = email;

public String getSex() \{

return sex;

public void setSex(String sex) \{

this.sex = sex;

public int getAge() \{

return age;

public void setAge(int age) \{

this.age = age;

public List getCardList() \{

return cardList;

public void setCardList(List cardList) \{

this.cardList = cardList;

2、Card类

package com.doit8.test.jsontest.pojo;

public class Card \{

private String cardName;

private String cardCode;

private Integer cardValue;

public String getCardName() \{

return cardName;

public void setCardName(String cardName) \{

this.cardName = cardName;

public String getCardCode() \{

return cardCode;

public void setCardCode(String cardCode) \{

this.cardCode = cardCode;

public Integer getCardValue() \{

return cardValue;

public void setCardValue(Integer cardValue) \{

this.cardValue = cardValue;

3、JSON处理测试类

package com.doit8.test.jsontest;

import java.util.ArrayList;

import java.util.List;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.JSONArray;

import com.alibaba.fastjson.JSONObject;

import com.doit8.test.jsontest.pojo.Card;

import com.doit8.test.jsontest.pojo.Person;

/\*\*

\* JSON转换

\*/

public class App

public static void main( String\[\] args )

//1。通过对象生成JSON串，对象里包含对象数组转成JSON串。

Person person=new Person();

person.setUsername("xiejava");

person.setSex("man");

person.setAge(38);

person.setEmail("xiejava@ishareread.com");

Card card1=new Card();

card1.setCardName("bankCard1");

card1.setCardCode("888888888");

card1.setCardValue(99999999);

Card card2=new Card();

card2.setCardName("bankCard1");

card2.setCardCode("999999999");

card2.setCardValue(222222222);

//对象数组

List cards=new ArrayList();

cards.add(card1);

cards.add(card2);

person.setCardList(cards);

String json = JSON.toJSON(person).toString();

System.out.println(json);

//2.通过JSON对象生成JSON串

JSONObject jObject=new JSONObject();

jObject.put("username", "xiejava");

jObject.put("sex", "man");

jObject.put("age", 38);

jObject.put("email", "xiejava@ishareread.com");

//通过JSONArray包装对象数组

JSONArray jArray=new JSONArray();

jArray.addAll(cards);

jObject.put("cardList", jArray);

String json2=jObject.toJSONString();

System.out.println(json2);

//3.通过JSON对象生成JSON串

JSONObject jObject2=new JSONObject();

jObject2.put("username", "xiejava");

jObject2.put("sex", "man");

jObject2.put("age", 38);

jObject2.put("email", "xiejava@ishareread.com");

//构造JSON字符串

String cardjsonStr1="\{\\"cardName\\":\\"bankCard1\\",\\"cardCode\\":\\"888888888\\",\\"cardValue\\":99999999\}";

String cardjsonStr2="\{\\"cardName\\":\\"bankCard2\\",\\"cardCode\\":\\"999999999\\",\\"cardValue\\":222222222\}";

JSON.parseObject(cardjsonStr1);

JSONArray jArray2=new JSONArray();

//将JSON字符串转成JSON对象，加入到JSONArray，\[注意一定要用JSON.parseObject()方法转换成JSON对象，否则还是字符串，转成JSON串的时候会带双引号。\]

jArray2.add(JSON.parseObject(cardjsonStr1));

jArray2.add(JSON.parseObject(cardjsonStr2));

jObject2.put("cardList", jArray2);

String json3=jObject2.toJSONString();

System.out.println(json3);

pom.xml中引入fastjson包

com.alibabagroupId>

fastjsonartifactId>

1.2.15version>

dependency>

运行结果

\{"cardList":\[\{"cardName":"bankCard1","cardCode":"888888888","cardValue":99999999\},\{"cardName":"bankCard1","cardCode":"999999999","cardValue":222222222\}\],"sex":"man","age":38,"email":"xiejava@ishareread.com","username":"xiejava"\}

\{"cardList":\[\{"cardCode":"888888888","cardName":"bankCard1","cardValue":99999999\},\{"cardCode":"999999999","cardName":"bankCard1","cardValue":222222222\}\],"sex":"man","age":38,"email":"xiejava@ishareread.com","username":"xiejava"\}

\{"cardList":\[\{"cardName":"bankCard1","cardCode":"888888888","cardValue":99999999\},\{"cardName":"bankCard2","cardCode":"999999999","cardValue":222222222\}\],"sex":"man","age":38,"email":"xiejava@ishareread.com","username":"xiejava"\}

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