为了测试,先建一个类Article.java
@Data #这里用的lombok
@AllArgsConstructor
@NoArgsConstructor
public class Article {
private Integer id;
private String summary;
private String author;
}
然后测试类
public void outSay(){
Article article = new Article(1,"我没说过","鲁迅");
Article article1 = new Article(2,"我说过了","周树人");
List<Article> list=new ArrayList<>();
list.add(article);
list.add(article1);
//对象转为Json字符串
String a= JSON.toJSONString(article);
String a1= JSON.toJSONString(article1);
System.out.println(a);
System.out.println(a1);
JSONObject jsonObject=JSONObject.parseObject(a);
//Json转对象
Object id=jsonObject.get("id");
System.out.println(id.getClass()+" : "+id);
Object summary=jsonObject.get("summary");
System.out.println(summary.getClass()+" : "+summary);
//List转json
Object listToJson = JSON.toJSON(list);
System.out.println(listToJson);
//json转List
String listToJson1=JSON.toJSONString(listToJson);
List<Article> articleList= JSONArray.parseArray(listToJson1,Article.class);
articleList.forEach(obj->System.out.println(obj.toString()));
}
输出结果
{
"author":"鲁迅","id":1,"summary":"我没说过"}
{
"author":"周树人","id":2,"summary":"我说过了"}
class java.lang.Integer : 1
class java.lang.String : 我没说过
[{
"summary":"我没说过","author":"鲁迅","id":1},{
"summary":"我说过了","author":"周树人","id":2}]
Article(id=1, summary=我没说过, author=鲁迅)
Article(id=2, summary=我说过了, author=周树人)