guanxf

JSON轉換的四種各種情況：

1. //把java 對象列表轉換為json對象數組，并轉為字符串

    JSONArray array = JSONArray.fromObject(userlist);
    String jsonstr = array.toString();

2.//把java對象轉換成json對象，并轉化為字符串

  JSONObject object = JSONObject.fromObject(invite);
   String str=object.toString());

3.//把JSON字符串轉換為JAVA 對象數組

  String personstr = getRequest().getParameter("persons");
  JSONArray json = JSONArray.fromObject(personstr);
  List<InvoidPerson> persons = (List<InvoidPerson>)JSONArray.toCollection(json, nvoidPerson.class);
4.//把JSON字符串轉換為JAVA 對象

  JSONObject jsonobject = JSONObject.fromObject(str);
  PassportLendsEntity passportlends = null;
  try {
   //獲取一個json數組
   JSONArray array = jsonobject.getJSONArray("passports");
   //將json數組 轉換成 List<PassPortForLendsEntity>泛型
   List<PassPortForLendsEntity> list = new ArrayList<PassPortForLendsEntity>();
   for (int i = 0; i < array.size(); i++) {   
            JSONObject object = (JSONObject)array.get(i);  
            PassPortForLendsEntity passport = (PassPortForLendsEntity)JSONObject.toBean(object,
              PassPortForLendsEntity.class);
            if(passport != null){
             list.add(passport);
            }  
     }
   //轉換PassportLendsEntity 實體類
  passportlends = (PassportLendsEntity)JSONObject.toBean(jsonobject, PassportLendsEntity.class);

  str = "{\"lendperson\":\"李四\",\"lendcompany\":\"有限公司\",\"checkperson\":\"李四\",