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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

復制代碼代碼如下:

	
	  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

復制代碼代碼如下:

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\",

\"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\"}]}";

相關的jar包：
JAVA對象JSON數據互相轉換的四種常見情況