FastJSON使用例子

最新推荐文章于 2019-10-31 10:29:34 发布

原创最新推荐文章于 2019-10-31 10:29:34 发布 · 362 阅读

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这篇博客详细介绍了如何在Java中使用FastJSON库进行数据序列化和反序列化的操作，通过FastjsonTest.java和User.java的实例代码，展示了其简单易用的特性。运行结果显示了FastJSON在实际应用中的高效性能。

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FastjsonTest.jva

package demo;

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

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.alibaba.fastjson.serializer.SerializerFeature;

public class FastjsonTest {
	public static void main(String[] args) {
		User user = new User(1, "张三", new Date());
		test1(user);
		test2(user);
		test3(user);
		test4(user);
		test5(user);
		test6(user);
		test7(user);
		test8();
	}
	// 对象转成JSON字符串
	private static void test1(User user) {
		String s = JSON.toJSONString(user);
		print(1,s);
	}

	// 对象转成JSON字符串，格式化日期
	private static void test2(User user) {
		String s = JSON.toJSONString(user, SerializerFeature.WriteDateUseDateFormat);
		print(2,s);
	}

	// 对象转成JSON字符串，指定日期格式化
	private static void test3(User user) {
		String s = JSON.toJSONStringWithDateFormat(user, "yyyy-MM-dd HH:mm:ss.SSS");
		print(3,s);
	}

	// 对象转成JSON字符串，美化JSON格式
	private static void test4(User user) {
		String s = JSON.toJSONStringWithDateFormat(user, "yyyy-MM-dd", SerializerFeature.PrettyFormat);
		print(4,s);
	}

	// 对象转成JSON字符串，默认字段值为NULL不获取，可以加上SerializerFeature.WriteMapNullValue获取
	private static void test5(User user) {
		String s = JSON.toJSONStringWithDateFormat(user, "yyyy-MM-dd", SerializerFeature.PrettyFormat, SerializerFeature.WriteMapNullValue);
		print(5,s);
	}

	// JSON字符串转化成对象
	private static void test6(User user) {
		String s = JSON.toJSONString(user);
		print(6,s);
		User user2 = JSON.parseObject(s, User.class);
		print(6,user2.toString());
	}
	
	//JSON转成Map<String, Object>
	private static void test7(User user){		
		String json = JSON.toJSONStringWithDateFormat(user, "yyyy-MM-dd");
		Map<String, Object> map1 = JSON.parseObject(json, new TypeReference<Map<String, Object>>(){});		
		print(7, map1.toString());
	}
	
	//JSON转成List<Map>
	private static void test8()	{
		User user1 = new User(1, "张三", new Date());
		User user2 = new User(2, "李四", new Date());
		List<User> list1 = new ArrayList<User>();
		list1.add(user1);
		list1.add(user2);		
		String json = JSON.toJSONString(list1);
		List<Map> maplist = JSON.parseArray(json, Map.class);		
		print(8, maplist.toString());
	}

	private static void print(int method, String info) {
		System.out.print("test" + method + "输出：\r\n" + info + "\r\n");
	}
}

User.java

package demo;

import java.util.Date;
import java.util.List;

public class User {
	private Integer id;
	private String name;
	private Date createDate;	
	private String password;
	
	public User(){		
	}
	
	public User(int id, String name, Date createDate) {
		this.id = id;
		this.name = name;
		this.createDate = createDate;
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}	
	
	public Date getCreateDate() {
		return createDate;
	}

	public void setCreateDate(Date createDate) {
		this.createDate = createDate;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}
	
	@Override
	public String toString() {
		return "user [id="+id+",name="+name+",createDate="+createDate+",password="+password+"]";
	}

}

运行结果：

test1输出：
{"createDate":1564739625396,"id":1,"name":"张三"}
test2输出：
{"createDate":"2019-08-02 17:53:45","id":1,"name":"张三"}
test3输出：
{"createDate":"2019-08-02 17:53:45.396","id":1,"name":"张三"}
test4输出：
{
	"createDate":"2019-08-02",
	"id":1,
	"name":"张三"
}
test5输出：
{
	"createDate":"2019-08-02",
	"id":1,
	"name":"张三",
	"password":null
}
test6输出：
{"createDate":1564739625396,"id":1,"name":"张三"}
test6输出：
user [id=1,name=张三,createDate=Fri Aug 02 17:53:45 CST 2019,password=null]
test7输出：
{id=1, name=张三, createDate=2019-08-02}
test8输出：
[{id=1, name=张三, createDate=1564739625490}, {id=2, name=李四, createDate=1564739625490}]