1     public static void jSONObjectToJavaBean() throws ClassCastException{
 2         JSONObject jsonObject = new JSONObject();
 3         jsonObject.put("id", 1);
 4         jsonObject.put("name", "杨文培");
 5         jsonObject.put("sex", "男");
 6         jsonObject.put("age", null);//如果是null字符串应该表示为"'null'";int时null默认为0
 7         jsonObject.put("birthday", "1993-01-23");
 8         List<String> list = new ArrayList<String>();
 9         list.add("篮球");
10         list.add("乒乓球");
11         list.add("羽毛球");
12         jsonObject.put("hobby", list);
13         jsonObject.put("boo", false);
14         System.out.println("jsonObject.toString()="+jsonObject.toString());
15         try{
16             Student student = (Student) JSONObject.toBean(jsonObject,Student.class);
17             System.out.println("student="+student);
18         }catch(ClassCastException exception){
19             System.err.println("exception="+exception.getMessage());
20         }
21     }

 map转换：

 1     public static void mapToJSONObject(){
 2         Map<String, Object> map = new HashMap<String,Object>();
 3         map.put("id", 1);
 4         map.put("name", "杨文培");
 5         map.put("sex", null);
 6         map.put("age", 23);
 7         map.put("birthday", "1993-01-23");
 8         List<String> list = new ArrayList<String>();
 9         list.add("篮球");
10         list.add("乒乓球");
11         list.add("羽毛球");
12         map.put("hobby", list);
13         map.put("boo", false);
14         JSONObject jsonObject = JSONObject.fromObject(map);
15         System.out.println("map.toString()="+map.toString());
16         System.out.println("jsonObject.toString()="+jsonObject.toString());
17         try{
18             Student student = (Student) JSONObject.toBean(jsonObject,Student.class);
19             System.out.println("student="+student);
20         }catch(ClassCastException exception){
21             System.err.println("exception="+exception.getMessage());
22         }
23     }