String與object的轉換

1. //把java對象列表轉換爲json對象數組，並轉爲字符串

JSONArrayarray = JSONArray.fromObject(userlist);
Stringjsonstr = array.toString();

2.//把java對象轉換成json對象，並轉化爲字符串

JSONObject object =JSONObject.fromObject(invite);
Log4jInit.ysulogger.debug(object.toString());

3.//把JSON字符串轉換爲JAVA對象數組

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

str ="{"lendperson":"李四","lendcompany":"有限公司","checkperson":"李四",
"lenddate":"2010-07-19T00:00:00","lendcounts":4,"
passports":[{"passportid":"d","name":"李豫川","passporttype":"K"},
{"passportid":"K9051","name":"李平","passporttype":"K"},
{"passportid":"K90517","name":"袁寒梅","passporttype":"K"},
{"passportid":"K905199","name":"賀明","passporttype":"K"}]}";
JSONObjectjsonobject = JSONObject.fromObject(str);
PassportLendsEntitypassportlends = null;
try {
//獲取一個json數組
JSONArrayarray = jsonobject.getJSONArray("passports");
//將json數組 轉換成List泛型
Listlist = newArrayList();
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);