Java對象與JSON對象相互轉換

Java對象與JSON對象相互轉換

1.創建Address類

public class Address {

    // 省
    private String province;
    // 市
    private String city;
    // 街道
    private String street;

    public Address() {
    }
    public Address(String province, String city, String street) {
    super();
    this.province = province;
    this.city = city;
    this.street = street;
    }
    public String getProvince() {
        return province;
    }
    public void setProvince(String province) {
        this.province = province;
    }
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    public String getStreet() {
        return street;
    }
    public void setStreet(String street) {
        this.street = street;
    }
    @Override
    public String toString() {
    StringBuilder builder = new StringBuilder();
    builder.append("Address [province=");
    builder.append(province);
    builder.append(", city=");
    builder.append(city);
    builder.append(", street=");
    builder.append(street);
    builder.append("]");
    return builder.toString();
    }

}

2.創建Student類

public class Student {

    private String name;
    private int age;
    private Address address;


    public Student() {
    }
    public Student(String name, int age, Address address) {
    super();
    this.name = name;
    this.age = age;
    this.address = address;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public Address getAddress() {
        return address;
    }
    public void setAddress(Address address) {
        this.address = address;
    }
    @Override
    public String toString() {
    StringBuilder builder = new StringBuilder();
    builder.append("Student [name=");
    builder.append(name);
    builder.append(", age=");
    builder.append(age);
    builder.append(", address=");
    builder.append(address);
    builder.append("]");
    return builder.toString();
    }

}

3.將Java對象轉換成JSON對象

引入json開發工具包

引入GSON框架jar包

import com.google.gson.Gson;

import net.sf.json.JSONObject;

public class JsonTest {

    public static void main(String[] args) {

    Address address = new Address("江蘇", "南京", "石華街16號");
    Student student = new Student("zhangsan", 20, address);

    // Java 對象轉出成JSON對象
    JSONObject jsonObject = JSONObject.fromObject(student);
    System.out.println(jsonObject);
    // JSON對象轉換成Java對象
    Student student2 = (Student) JSONObject.toBean(jsonObject, Student.class);
    System.out.println(student2);

    // google提供的GSON框架
    String jsonString = new Gson().toJson(student);
    System.out.println(jsonString);
    Student student3 = new Gson().fromJson(jsonObject.toString(), Student.class);
    System.out.println(student3);

    }
}

4.打印結果