Fastjson json和java之间转换

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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：https://github.com/alibaba/fastjson。

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);      }  }

输出：

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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