https://blog.csdn.net/weixin_36910300/article/details/79182120

創建兩個實體類 一個是部門類，一個是部門員工類

部門員工類

public classPerson {privateInteger id;privateString name;privateInteger age;publicInteger getId() {returnid;

}public voidsetId(Integer id) {this.id =id;

}publicString getName() {returnname;

}public voidsetName(String name) {this.name =name;

}publicInteger getAge() {returnage;

}public voidsetAge(Integer age) {this.age =age;

}

@OverridepublicString toString() {return "Person{" +

"id=" + id +

", name='" + name + '\'' +

", age=" + age +

'}';

}

}

部門類

public classDept {privateString deptName;private ListpersonList;publicString getDeptName() {returndeptName;

}public voidsetDeptName(String deptName) {this.deptName =deptName;

}public ListgetPersonList() {returnpersonList;

}public void setPersonList(ListpersonList) {this.personList =personList;

}

@OverridepublicString toString() {return "Dept{" +

"deptName='" + deptName + '\'' +

", personList=" + personList +

'}';

}

}

對象轉為json字符串格式

JSON.toJSONString(Object object)

@Testpublic voidfun1(){

List personArrayList = new ArrayList();

Person person= newPerson();

person.setId(1);

person.setName("張三");

person.setAge(18);

System.out.println(JSON.toJSONString(person));

personArrayList.add(person);

Person person1= newPerson();

person1.setId(2);

person1.setName("李四");

person1.setAge(18);

personArrayList.add(person1);

System.out.println(JSON.toJSONString(person1));

Dept dept= newDept();

dept.setDeptName("財務部");

dept.setPersonList(personArrayList);

String jsonString=JSON.toJSONString(personArrayList);

System.out.println(jsonString);

}

控制臺的打印

JSON字符串轉JavaBean

JSON.parseObject(String text,Class clazz)

@Testpublic voidfun2(){

String str1="{\"age\":18,\"id\":1,\"name\":\"張三\"}";

System.out.println(JSON.parseObject(str1,Person.class));

String str2="{\"age\":18,\"id\":2,\"name\":\"李四\"}";

System.out.println(JSON.parseObject(str2,Person.class));

}

控制臺打印

JSON字符串數組轉List集合

JSON.parseArray(String text, Class clazz)

@Testpublic voidfun3(){

String str="[{\"age\":18,\"id\":1,\"name\":\"張三\"},{\"age\":18,\"id\":2,\"name\":\"李四\"}]";

List PersonList=JSON.parseArray(str,Person.class);

System.out.println(PersonList);

}

控制臺打印

Map集合轉json

JSON.toJSONString(Object object)

@Testpublic voidfun4(){

Map personMap=new HashMap();

Person person= newPerson();

person.setId(1);

person.setName("張三");

person.setAge(18);

personMap.put("zhangsan",person);

Person person1= newPerson();

person1.setId(2);

person1.setName("李四");

person1.setAge(18);

personMap.put("lisi",person1);

String json=JSON.toJSONString(personMap);

System.out.println(json);

}

控制臺打印的信息

MapJson字符串轉Map集合

(Map)JSON.parse(Object object)

@Testpublic voidfun5(){

String str="{\"lisi\":{\"age\":18,\"id\":2,\"name\":\"李四\"},\"zhangsan\":{\"age\":18,\"id\":1,\"name\":\"張三\"}}";

Map map =(Map)JSONObject.parse(str);

System.out.println(map.get("lisi"));

System.out.println(map.get("zhangsan"));

}

控制臺的打印輸出

總結

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