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Java对象与JSON对象相互转换

2017-08-25 21:46 696 查看

Java对象与JSON对象相互转换

1.创建Address类

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.创建Student类

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.将Java对象转换成JSON对象

引入json开发工具包



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("江苏", "南京", "石华街16号");
Student student = new Student("zhangsan", 20, address);

// Java 对象转出成JSON对象
JSONObject jsonObject = JSONObject.fromObject(student);
System.out.println(jsonObject);
// JSON对象转换成Java对象
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.打印结果

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