Fastjson,是阿里巴巴提供的一个Java语言编写的高性能功能完善的JSON库。
其开源的下载网址为:GitHub – alibaba/fastjson: A fast JSON parser/generator for Java.。
示例代码如下:
package test;
import java.util.ArrayList;
import java.util.List;
import com.alibaba.fastjson.JSON;
class User {
private String name;
private int age;
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;
}
@Override
public String toString() {
return "User [name=" + name + ", age=" + age + "]";
}
};
class UserGroup {
private String name;
private List<User> users = new ArrayList<User>();
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<User> getUsers() {
return users;
}
public void setUsers(List<User> users) {
this.users = users;
}
@Override
public String toString() {
return "UserGroup [name=" + name + ", users=" + users + "]";
}
}
class FastJsonTest {
public static void main(String[] args) {
// 构建用户geust
User guestUser = new User();
guestUser.setName("guest");
guestUser.setAge(28);
// 构建用户root
User rootUser = new User();
rootUser.setName("root");
guestUser.setAge(35);
// 构建用户组对象
UserGroup group = new UserGroup();
group.setName("admin");
group.getUsers().add(guestUser);
group.getUsers().add(rootUser);
// 用户组对象转JSON串
String jsonString = JSON.toJSONString(group);
System.out.println("jsonString:" + jsonString);
// JSON串转用户组对象
UserGroup group2 = JSON.parseObject(jsonString, UserGroup.class);
System.out.println("group2:" + group2);
// 构建用户对象数组
User[] users = new User[2];
users[0] = guestUser;
users[1] = rootUser;
// 用户对象数组转JSON串
String jsonString2 = JSON.toJSONString(users);
System.out.println("jsonString2:" + jsonString2);
// JSON串转用户对象列表
List<User> users2 = JSON.parseArray(jsonString2, User.class);
System.out.println("users2:" + users2);
}
}
结果:
jsonString:{"name":"admin","users":[{"age":35,"name":"guest"},{"age":0,"name":"root"}]}
group2:UserGroup [name=admin, users=[User [name=guest, age=35], User [name=root, age=0]]]
jsonString2:[{"age":35,"name":"guest"},{"age":0,"name":"root"}]
users2:[User [name=guest, age=35], User [name=root, age=0]]
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