java FastJSON之JSON互相转Map集合，List集合，JavaBean

转发地址

maven工程的依赖

        
            com.alibaba
            fastjson
            1.2.45
        

创建两个实体类 一个是部门类，一个是部门员工类

部门员工类

public class Person {

    private Integer id;

    private String name;

    private Integer age;

    public Integer getId() {
        return id;
    }

    public void setId(Integer 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;
    }
    @Override
    public String toString() {
        return "Person{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
 }

部门类

public class Dept {
    private String deptName;
    private List personList;

    public String getDeptName() {
        return deptName;
    }

    public void setDeptName(String deptName) {
        this.deptName = deptName;
    }

    public List getPersonList() {
        return personList;
    }

    public void setPersonList(List personList) {
        this.personList = personList;
    }
    @Override
    public String toString() {
        return "Dept{" +
                "deptName='" + deptName + '\'' +
                ", personList=" + personList +
                '}';
    }
}

对象转为json字符串格式

JSON .toJSONString( Object object)

 @Test
    public void fun1(){
        List personArrayList = new ArrayList();
        Person person = new Person();
        person.setId(1);
        person.setName("张三");
        person.setAge(18);
        System.out.println(JSON.toJSONString(person));
        personArrayList.add(person);
        Person person1 = new Person();
        person1.setId(2);
        person1.setName("李四");
        person1.setAge(18);
        personArrayList.add(person1);
        System.out.println(JSON.toJSONString(person1));
        Dept dept = new Dept();
        dept.setDeptName("财务部");
        dept.setPersonList(personArrayList);
        String jsonString = JSON.toJSONString(personArrayList);
        System.out.println(jsonString);
    }

JSON字符串转JavaBean

JSON.parseObject( String text , Class clazz)

@Test
    public void fun2(){
        String str1="{\"age\":18,\"id\":1,\"name\":\"张三\"}";
        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));

    }

JSON字符串数组转List集合

JSON.parseArray( String text , Class clazz)

@Test
    public void fun3(){
        String str="[{\"age\":18,\"id\":1,\"name\":\"张三\"},{\"age\":18,\"id\":2,\"name\":\"李四\"}]";
        List PersonList=JSON.parseArray(str,Person.class);
        System.out.println(PersonList);
    }

Map集合转json

JSON.toJSONString(Object object)

@Test
    public void fun4(){
        Map personMap=new HashMap();
        Person person = new Person();
        person.setId(1);
        person.setName("张三");
        person.setAge(18);
        personMap.put("zhangsan",person);

        Person person1 = new Person();
        person1.setId(2);
        person1.setName("李四");
        person1.setAge(18);
        personMap.put("lisi",person1);

        String json =  JSON.toJSONString(personMap);
        System.out.println(json);
    }

MapJson字符串转Map集合

(Map) JSON .parse( Object object)

@Test
    public void fun5(){
        String str="{\"lisi\":{\"age\":18,\"id\":2,\"name\":\"李四\"},\"zhangsan\":{\"age\":18,\"id\":1,\"name\":\"张三\"}}";
        Map map = (Map)JSONObject.parse(str);
        System.out.println(map.get("lisi"));
        System.out.println(map.get("zhangsan"));
    }