1. 目标
把类的对象存储到字符串可存储
2. 类定义
public interface JsonInterface {}mport com.alibaba.fastjson.JSON;import lombok.Getter;import lombok.Setter;@Setter@Getterpublic class JsonVo implements JsonInterface { ???private String id; ???private String name; ???public JsonVo(String id, String name) { ???????super(); ???????this.id = id; ???????this.name = name; ???} ???@Override ???public String toString() { ???????return String.format("id:%s ??|||| ?name:%s", id, name); ???}}3. 测试
???public void test() { ???????JsonInterface tmp = new JsonVo("id1", "name1"); ???????String json = JSON.toJSONString(tmp); ???????System.out.println(json); ???????JsonInterface jsonVo = JSON.parseObject(json, JsonVo.class); ???????System.out.println(jsonVo); ???????System.out.println("--------"); ???????byte[] bytes = JSON.toJSONBytes(tmp); ???????System.out.println(bytes); ???????JsonInterface jsonVo2 = JSON.parseObject(bytes, JsonVo.class); ???????System.out.println(jsonVo2); ???}结果
{"id":"id1","name":"name1"}id:id1 ??|||| ?name:name1--------[B@383534aaid:id1 ??|||| ?name:name14. Fastjson
Fastjson是一个Java语言编写的高性能功能完善的JSON库。它采用一种“假定有序快速匹配”的算法，把JSON Parse的性能提升到极致，是目前Java语言中最快的JSON库。Fastjson接口简单易用，已经被广泛使用在缓存序列化、协议交互、Web输出、Android客户端等多种应用场景
5. TypeReference
例1
public void test2() { ???????List<Integer> list = new ArrayList<>(); ???????list.add(1); ???????list.add(9); ???????list.add(4); ???????list.add(8); ???????JSONObject jsonObj = new JSONObject(); ???????jsonObj.put("a", list); ???????System.out.println(jsonObj); ???????List<String> list2 = jsonObj.getObject("a", new TypeReference<List<Integer>>(){}); ???????System.out.println(list2); ???}结果
{"a":[1,9,4,8]}[1, 9, 4, 8]例2
public void test3() { ???????List<JsonVo> list = new ArrayList<>(); ???????list.add(new JsonVo("id1", "name1")); ???????list.add(new JsonVo("id2", "name2")); ???????list.add(new JsonVo("id3", "name3")); ???????JSONObject jsonObj = new JSONObject(); ???????jsonObj.put("a", list); ???????System.out.println(jsonObj); ???????List<String> list2 = jsonObj.getObject("a", new TypeReference<List<JsonVo>>(){}); ???????System.out.println(list2); ???}结果
{"a":[{"id":"id1","name":"name1"},{"id":"id2","name":"name2"},{"id":"id3","name":"name3"}]}[id:id1 ??|||| ?name:name1, id:id2 ??|||| ?name:name2, id:id3 ??|||| ?name:name3]
com.alibaba.fastjson.JSON对类对象的序列化与反序列化
原文地址：https://www.cnblogs.com/kaituorensheng/p/9886425.html