JAVA中的JSON之FASTJSON

最新推荐文章于 2025-07-08 15:52:48 发布

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本文详细介绍阿里开源的FastJSON框架，演示如何将Java对象转换为JSON字符串，以及如何从JSON字符串解析到Java对象、List和Map。通过具体示例，展示了FastJSON的灵活性和强大功能。

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什么是FASTJSON

FastJson是阿里的开源框架,被不少企业使用,是一个极其优秀的Json框架

jar包引入

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>fastjson</artifactId>
	<version>1.2.54</version>
</dependency>

实体类

public class Student {
	private String id;
	private String name;
	private int age;
	
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	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 "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
	}

}

public class Classes {
	private String id;
	private String name;
	private List<Student> studentList;
	
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public List<Student> getStudentList() {
		return studentList;
	}
	public void setStudentList(List<Student> studentList) {
		this.studentList = studentList;
	}
	@Override
	public String toString() {
		return "Classes [id=" + id + ", name=" + name + ", studentList=" + studentList + "]";
	}
}

转换操作

public class APP {
	public static void main(String[] args) {
		Student student = new Student();
		student.setId("1");
		student.setName("张三");
		student.setAge(20);

		List<Student> studentList = new ArrayList<Student>();
		studentList.add(student);

		Classes classes = new Classes();
		classes.setId("1");
		classes.setName("一班");
		classes.setStudentList(studentList);

		// java对象转为json
		 String classJson = JSONObject.toJSONString(classes);
		 System.out.println(classJson);
		 
		// json转为java对象
		String json = "{\"id\":\"1\",\"name\":\"一班\",\"studentList\":[{\"id\":\"1\",\"name\":\"张三\",\"age\":20}]}";
		Classes classes2 = JSONObject.parseObject(json, Classes.class);
		System.out.println(classes2);

		// json转换为list
		String jsonList = "[{\"id\":\"1\",\"name\":\"张三\",\"age\":20}]";
		studentList = JSONArray.parseArray(jsonList, Student.class);
		System.out.println(studentList);

		// json转为map
		Map<String, Object> map = JSONObject.parseObject(classJson, new TypeReference<Map<String, Object>>() {});
		System.out.println(map);
		
		//结果
		//{"id":"1","name":"一班","studentList":[{"id":"1","name":"张三","age":20}]}
		//Classes [id=1, name=一班, studentList=[Student [id=1, name=张三, age=20]]]
		//[Student [id=1, name=张三, age=20]]
		//{name=一班, studentList=[{id=1, name=张三, age=20}], id=1}
	}
}