Fastjson的基本用法

本文主要是介绍Fastjson的基本用法，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

• 一引入依赖

<!-- json解析用 -->
<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.76</version>
</dependency>
<!-- 简化代码，方便日志打印 -->
<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.24</version> 
</dependency>

• 二用到的测试实体

@Data
@AllArgsConstructor
public class Student implements Serializable,Cloneable {private static final long serialVersionUID = 6447932156561222739L;private Integer sNo;private String name;private Date birthday;private Integer classNo;private String grade;/*** 方便对象复制* @return* @throws CloneNotSupportedException*/@Overrideprotected Student clone() throws CloneNotSupportedException {return (Student) super.clone();}
}

• 三转json（序列化）

1. 实体转json

Student s1 = new Student(1,"张三",new Date(),1001,"一年级");
String s1Json = JSON.toJSONString(s1);
log.info("fastjson将Student转的json为{}",s1Json);

2. Map转json

Student s1 = new Student(1,"张三",new Date(),1001,"一年级");
Student s2 = s1.clone();
s2.setSNo(2);
Student s3 = s1.clone();
s3.setSNo(3);
Student s4 = s1.clone();
s4.setSNo(4);
Map<String,Student> data = new LinkedHashMap();
data.put("s1",s1);
data.put("s2",s2);
data.put("s3",s3);
data.put("s4",s4);String mapJson = JSON.toJSONString(data);
log.info("fastjson将map转的json为{}",mapJson);

3. List转json

Student s1 = new Student(1,"张三",new Date(),1001,"一年级");
Student s2 = s1.clone();
s2.setSNo(2);
Student s3 = s1.clone();
s3.setSNo(3);
Student s4 = s1.clone();
s4.setSNo(4);List<Student> studentList = new ArrayList<>(Arrays.asList(s1,s2,s3,s4));
String listJson = JSON.toJSONString(studentList);
log.info("fastjson将List转的json为{}",listJson);

• 四转Java对象（反序列化）

1. json转实体

Student s1 = new Student(1,"张三",new Date(),1001,"一年级");
String s1Json = JSON.toJSONString(s1);
log.info("fastjson将Student转的json为{}",s1Json);Student json1Student = JSON.parseObject(s1Json,Student.class);
log.info("json转实体Student结果：{}",json1Student);

2. json转Map

Student s1 = new Student(1,"张三",new Date(),1001,"一年级");
Student s2 = s1.clone();
s2.setSNo(2);
Student s3 = s1.clone();
s3.setSNo(3);
Student s4 = s1.clone();
s4.setSNo(4);Map<String,Student> data = new LinkedHashMap();
data.put("s1",s1);
data.put("s2",s2);
data.put("s3",s3);
data.put("s4",s4);
String mapJson = JSON.toJSONString(data);
log.info("fastjson将map转的json为{}",mapJson);Map<String,Student> json2map = JSON.parseObject(mapJson,Map.class);
log.info("json转Map结果：{}",json2map);

3. json转List

Student s1 = new Student(1,"张三",new Date(),1001,"一年级");
Student s2 = s1.clone();
s2.setSNo(2);
Student s3 = s1.clone();
s3.setSNo(3);
Student s4 = s1.clone();
s4.setSNo(4);List<Student> studentList = new ArrayList<>(Arrays.asList(s1,s2,s3,s4));
String listJson = JSON.toJSONString(studentList);
log.info("fastjson将List转的json为{}",listJson);List<Student> json2List = JSON.parseObject(listJson,new TypeReference<List<Student>>(){});
log.info("json转List结果：{}",json2List);

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