阿里fastJson几种Json方式

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public class Main {    @Test    public void main() {   // write your code here        int sum=0;        for(int i=0;i<5;i++){            sum+=i;        }        System.out.print(sum);    }    public void JSONTest(){        String str="{\"errCode\":\"0\",\"id\":\"10\"}";        System.out.print(str);    }    @Test    public void setFastJson(){        JSONObject root =new JSONObject();//导入的包的形式是阿里巴巴地        root.put("errCode",1);        root.put("errMsg","调用接口成功");        JSONArray dateArr = new JSONArray();        JSONObject rootZhangchao = new JSONObject();        rootZhangchao.put("userName","张超");        rootZhangchao.put("position","java开发");        rootZhangchao.put("webAddress","www.itmayiedu.com");        dateArr.add(rootZhangchao);        root.put("date",dateArr);        System.out.print(root.toJSONString());    }    @Test    public void mapJson(){        Map<String,Object> root = new HashMap<>();        root.put("errCode",1);        root.put("errMsg","调用接口成功");        List<Map<String, Object>> userList = new ArrayList<>();        Map<String, Object> rootzhangchao = new HashMap<>();        rootzhangchao.put("id",1);        rootzhangchao.put("userName","张超");        rootzhangchao.put("position","java开发");        rootzhangchao.put("webAdrress","www.itmayiedu.com");        userList.add(rootzhangchao);       root.put("date", userList);        System.out.print(root.toString());    }    @Test    public void entityJson(){        Entity entity = new Entity();        entity.setErrCode("0");        entity.setErrMsg("调用接口成功");        List<User> userList = new ArrayList<>();        User user = new User();        user.setId(1);        user.setUserName("张超");        user.setPosition("java软件开发");        user.setWebAdrress("www.itmayiedu.com");        userList.add(user);        entity.setDate(userList);        System.out.print(entity.toString());    }}注：导入的包，只供测试使用：
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