fastjson是阿里巴巴的开源JSON解析库，它可以解析JSON格式的字符串，支持将Java Bean序列化为JSON字符串，也可以从JSON字符串反序列化到JavaBean。
在pom.xml文件引入以下声明，就可以使用
<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson --> ???????<dependency> ???????????<groupId>com.alibaba</groupId> ???????????<artifactId>fastjson</artifactId> ???????????<version>1.2.55</version> ???????</dependency>
使用举例：
1,解析成字符串
HashMap map = new HashMap(); ???????ArrayList<String> list = new ArrayList<String>(); ???????list.add("a"); ???????list.add("b"); ???????list.add("c"); ???????map.put("count", 12); ???????map.put("list", list); ???????System.out.println(JSON.toJSONString(map));// {"count":12,"list":["a","b","c"]}2，对象解析成json字符串
public class User { ???private int id; ???private String phone; ???private String password; ???public int getId() { ???????return id; ???} ???public void setId(int id) { ???????this.id = id; ???} ???public String getPhone() { ???????return phone; ???} ???public void setPhone(String phone) { ???????this.phone = phone; ???} ???public String getPassword() { ???????return password; ???} ???public void setPassword(String password) { ???????this.password = password; ???}}User user = new User(); ???????user.setId(1); ???????user.setPassword("11"); ???????user.setPhone("11"); ???????System.out.println(JSON.toJSONString(user));// ???????{"id":1,"password":"11","phone":"11"}3,json字符串解析成对象
String json = "{‘id‘:‘1‘,‘password‘:‘11‘,‘phone‘:‘11‘}"; ???????JSONObject userJson = JSONObject.parseObject(json); ???????User user = JSON.toJavaObject(userJson, User.class); ???????System.out.println(user); ???????System.out.println(user.getId());// ???????com.test.domain.User@443b7951// ???????1json fastjson
原文地址：https://www.cnblogs.com/luoa/p/10544943.html