List<SysUser> suList = new ArrayList<>();
Map<String,Object> suMap = new HashMap<>();
        for(int i = 0 ; i<3; i++){
            SysUser su = new SysUser();
su.setId(1);
su.setRoleId(2);
su.setUserPhone("phone"+i);
suList.add(su);
}
        //Map物件轉成JSON物件
suMap.put("suList"
 
,suList);
JSONObject ms = JSONObject.parseObject(JSONObject.toJSONString(suMap));
JSONArray suListMap = ms.getJSONArray("suList");
String suListMapStr = suListMap.toString();
System.out.println("Map物件轉換後的字串="+suListMapStr);
//List物件轉成JSON物件
JSONArray js = JSONArray.parseArray(JSONObject.toJSONString(suList));
 
String s = js.toJSONString();
System.out.println("List物件轉換後的字串="+s);
//        //JSONObject 轉化成List物件
ArrayList<SysUser> suArr = JSON.parseObject(s,new TypeReference<ArrayList<SysUser>>(){});
System.out.println("JSONObject 轉化成List物件"+suArr.size());