java List與json的轉換

Java代碼  

1. /** 
2.      * 根據頁面使用者輸入的資訊形成 Answer 對象的List 
3.      *  
4.      * @param answers 
5.      * @param question_ids 
6.      * @param types 
7.      * @return 
8.      */  
9.     private List<Answer> toAnswerList(String[] studenAnswers, int[] question_ids,  
10.             int[] types,int[] scores) {  
11.         List<Answer> answerList = new ArrayList<Answer>();  
12.           
13.         if(studenAnswers!=null && question_ids!= null && types!= null&& scores!= null){  
14.             for (int i = 0; i < studenAnswers.length; i++) {  
15.                   
16.                 Answer answer = new Answer();  
17.                 String studenAnswer = studenAnswers[i];  
18.                 int type = types[i];  
19.                 int question_id = question_ids[i];  
20.                 int score = scores[i];  
21.           
22.                   
23.                 answer.setQuestion_id(question_id);  
24.                 answer.setScore(score);  
25.                 answer.setStudenAnswer(studenAnswer);  
26.                 answer.setType(type);  
27.                   
28.                 answerList.add(answer);  
29.             }  
30.         }  
31.         return answerList;  
32.     }  
33.   
34.     /** 
35.      * 將一個json字串轉為list 
36.      * @param props 
37.      * @return 
38.      */  
39.     public static List<Answer> converAnswerFormString(String answer){  
40.         if (answer == null || answer.equals(""))  
41.             return new ArrayList();  
42.   
43.         JSONArray jsonArray = JSONArray.fromObject(answer);  
44.         List<Answer> list = (List) JSONArray.toCollection(jsonArray,  
45.                 Answer.class);  
46.           
47.         return list;  
48.     }  
49.       
50.     /** 
51.      *  
52.      * 將一個 Answer 對象的List 產生Json字串 
53.      * 是根據用戶端頁面使用者輸入的資訊產生的 
54.      *  
55.      *  
56.      */  
57.     public String getAnswerString(String[] studenAnswers, int[] question_ids,  
58.             int[] types,int[] scores) {  
59.         List list = toAnswerList(studenAnswers,  question_ids,  
60.                  types, scores);  
61.         JSONArray jsonarray = JSONArray.fromObject(list);  
62.   
63.         return jsonarray.toString();  
64.     }  
65.       
66.       
67.       
68.       
69.