java對象與JSON對象的互換

jar 包

json - 20090211.jar (Myeclipse 自帶jar包)
1.java 對象列表轉換成json對象數組
List list = new ArrayList();
JSONArray jsonArray = JSONArray.fromObject(list);
String jsonstr = jsonArray.toString ();

2.java對象轉換成json對象
JSONＯbject jsonObject = JSONObject.fromObject(object);

3.json字符串轉換爲Java對象
String personstr =getRequest().getParameter(“persons”);
JSONArray json =JSONArray.fromObject(personstr);
Listpersons =(List)JSONArray.toCollection(json,nvoidPerson.class);

4 json 字符串轉換成java對象
JSONObject jsonObject = new JSONObject (objectStr) ;
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);