序列化、持久化:将Goods对象转化为JSON对象
Goods goods=new Goods("香蕉","夏威夷香蕉",100,400);
String json=JSON.toJSONString(goods);
System.out.println(json);
反序列化:将JSON对象转化为Goods对象
String s="{\"des\":\"夏威夷香蕉\",\"inventory\":400,\"name\":\"香蕉\",\"price\":100}";
Goods goods=JSON.parseObject(s,Goods.class);
System.out.println(goods.getName()+" "+goods.getDes()+" "+goods.getInventory()
+" "+goods.getPrice());