Gson的使用

最新推荐文章于 2025-07-03 16:17:35 发布

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最新推荐文章于 2025-07-03 16:17:35 发布

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分类专栏： J2SE

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本文介绍了Gson库的基本用法，包括将Java集合转换为JSON字符串，以及从JSON字符串中解析Java对象的过程。通过具体的代码示例展示了如何操作List、Map及自定义Java Bean。

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1.person类

package cn.com.gson;

public class Person {

	private String name;
	
	private int age;
	
	private String company;

	public String getName() {
		return name;
	}

	public Person() {
		this.name = "yy";
		this.age = 25;
		this.company = "star";
	}
	
	public Person(String name, int age, String company) {
		this.name = name;
		this.age = age;
		this.company = company;
	}
	
	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String getCompany() {
		return company;
	}

	public void setCompany(String company) {
		this.company = company;
	}
	@Override
	public String toString() {
		// TODO Auto-generated method stub
		System.out.println("姓名：" + name +",年龄：" + age +",公司：" + company);
		return "";
	}
}

2.测试类

package cn.com.gson;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.google.gson.Gson;

public class TestGson {

	public static void main(String[] args) {
		
		System.out.println("--------------List2Gson---------");
		List<String> list = new ArrayList<String>();
		list.add("firstElement");
		list.add("secondElement");
		
		Gson gson = new Gson();
		String list2Json = gson.toJson(list);
		//["firstElement","secondElement"]
		System.out.println(list2Json);
		
		System.out.println("--------------Map2Gson---------");
		Map<String,String> map = new HashMap<String,String>();
		map.put("name","yyyy");
		map.put("age", "24");
		String map2Json = gson.toJson(map);
		//{"age":"24","name":"yyyy"}
		System.out.println(map2Json);
		
		System.out.println("--------------Bean2Gson---------");
		Person p1 = new Person("zhangsan",22,"Microsoft");
		Person p2 = new Person("lisi",23,"Google"); 
		Person p3 = new Person("wangwu",25,"Facebook");
		List<Person> beanList = new ArrayList<Person>();
		beanList.add(p1);
		beanList.add(p2);
		beanList.add(p3);
		String bean2Json = gson.toJson(beanList);
		//[{"name":"zhangsan","age":22,"company":"Microsoft"},{"name":"lisi","age":23,"company":"Google"},{"name":"wangwu","age":25,"company":"Facebook"}]
		System.out.println(bean2Json);
		
		System.out.println("--------------Gson2Bean---------");
		String beanStr = "{'name':'maliu','age':21,'company':'Baidu'}";
		Person p = gson.fromJson(beanStr, Person.class);
		//姓名：maliu,年龄：21,公司：Baidu
		System.out.println(p);
		
	}
}

3.结果

--------------List2Gson---------
["firstElement","secondElement"]
--------------Map2Gson---------
{"age":"24","name":"yyyy"}
--------------Bean2Gson---------
[{"name":"zhangsan","age":22,"company":"Microsoft"},{"name":"lisi","age":23,"company":"Google"},{"name":"wangwu","age":25,"company":"Facebook"}]
--------------Gson2Bean---------
姓名：maliu,年龄：21,公司：Baidu