fastjson 的简单用法

#fastjson 的简单用法

最近项目中接触到 fastjson 随手记录下关于 fastjson 的使用

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导入依赖

<dependency>

 <groupId>com.alibaba</groupId>

 <artifactId>fastjson</artifactId>

 <version>1.2.60</version>

</dependency>

​

JSON 字符串 -> 类实例

简单 JSON 字符串-> Java 对象

app.java

public  class  App 

{

 public  static  void  main( String[] args )

 {

String msg =  "{\"name\":\"java\",\"sex\":\"unknown\",\"age\":24}";

User user = JSON.parseObject(msg, User.class);

 System.out.println(user);

 }

}

​

User.java

public  class  User  {

 @JSONField(name =  "name")

 private String name;

 @JSONField(name =  "sex")

 private String sex;

 @JSONField(name =  "age")

 private  int age;

 public String getName()  {

 return name;

 }

 public  void  setName(String name)  {

 this.name  = name;

 }

 public String getSex()  {

 return sex;

 }

 public  void  setSex(String sex)  {

 this.sex  = sex;

 }

 public  int  getAge()  {

 return age;

 }

 public  void  setAge(int age)  {

 this.age  = age;

 }

 @Override

 public String toString()  {

 return  "User{"  +

 "name='"  + name +  '\''  +

 ", sex='"  + sex +  '\''  +

 ", age="  + age +

 '}';

 }

}

​

简单 JSON 字符串 -> JSON 对象

String msg =  "{\"name\":\"java\",\"sex\":\"unknown\",\"age\":24}";

JSONObject jsonObject = JSON.parseObject(msg);

 System.out.println(jsonObject);

​

稍复杂 JSON 字符串 -> Json 对象

String msg =  "{\"name\":\"java\",\"sex\":\"unknown\",\"age\":24,\"pets\":[{\"nick_name\":\"coco\",\"type\":\"cat\"},{\"nick_name\":\"kimi\",\"type\":\"dog\"}]}";

JSONObject jsonObject = JSON.parseObject(msg);

​

稍复杂 JSON 字符串 -> Java 对象

 public  static  void  main( String[] args )

 {

String msg =  "{\"name\":\"java\",\"sex\":\"unknown\",\"age\":24,\"pets\":[{\"nick_name\":\"coco\",\"type\":\"cat\"},{\"nick_name\":\"kimi\",\"type\":\"dog\"}]}";

User user = JSON.parseObject(msg,  new TypeReference<User<Pet>>(){});

 System.out.println(user);

 }

​

User.java

public  class  User<T>  {

  

 @JSONField(name =  "name")

 private String name;

 @JSONField(name =  "sex")

 private String sex;

 @JSONField(name =  "age")

 private  int age;

 @JSONField(name =  "pets")

 private T[] pets;

  

 public String getName()  {

 return name;

 }

  

 public  void  setName(String name)  {

 this.name  = name;

 }

  

 public String getSex()  {

 return sex;

 }

  

 public  void  setSex(String sex)  {

 this.sex  = sex;

 }

  

 public  int  getAge()  {

 return age;

 }

  

 public  void  setAge(int age)  {

 this.age  = age;

 }

  

 public T[]  getPets()  {

 return pets;

 }

  

 public  void  setPets(T[] pets)  {

 this.pets  = pets;

 }

}

​

Pet.java

public  class  Pet  {

  

 @JSONField(name =  "nick_name")

 private String nickName;

  

 @JSONField(name =  "type")

 private String type;

  

 public String getNickName()  {

 return nickName;

 }

  

 public  void  setNickName(String nickName)  {

 this.nickName  = nickName;

 }

  

 public String getType()  {

 return type;

 }

  

 public  void  setType(String type)  {

 this.type  = type;

 }

}

​