在前端：
1.如果json是List對象轉換的，可以直接遍歷json，讀取數據。
2.如果是需要把前端的List對象轉換為json傳到后臺，param是ajax的參數，那么轉換如下所示：
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var jsonStr = JSON.stringify(list); var param= {}; param.jsonStr=jsonStr; |
在后臺：
1.把String轉換為List(str轉換為list)
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List<T> list = new ArrayList<T>(); JSONArray jsonArray = JSONArray.fromObject(str);//把String轉換為json list = JSONArray.toList(jsonArray,t);//這里的t是Class<T> |
2.把List轉換為json
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JSONArray json = JSONArray.fromObject(object); String str = json.toString();//把json轉換為String |
eg:
1. 根據頁面用戶輸入的信息形成 Answer 對象的List
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/** * @param answers * @param question_ids * @param types * @return */ private List<Answer> toAnswerList(String[] studenAnswers, int[] question_ids, int[] types,int[] scores) { List<Answer> answerList = new ArrayList<Answer>(); if(studenAnswers!=null && question_ids!= null && types!= null&& scores!= null){ for (int i = 0; i < studenAnswers.length; i++) { Answer answer = new Answer(); String studenAnswer = studenAnswers[i]; int type = types[i]; int question_id = question_ids[i]; int score = scores[i]; answer.setQuestion_id(question_id); answer.setScore(score); answer.setStudenAnswer(studenAnswer); answer.setType(type); answerList.add(answer); } } return answerList; } /** * 將一個json字串轉為list * @param props * @return */ public static List<Answer> converAnswerFormString(String answer){ if (answer == null || answer.equals("")) return new ArrayList(); JSONArray jsonArray = JSONArray.fromObject(answer); List<Answer> list = (List) JSONArray.toCollection(jsonArray, Answer.class); return list; } |
2. 將一個 Answer 對象的List 生成Json字串，是根據客戶端頁面用戶輸入的信息生成的
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public String getAnswerString(String[] studenAnswers, int[] question_ids, int[] types,int[] scores) { List list = toAnswerList(studenAnswers, question_ids, types, scores); JSONArray jsonarray = JSONArray.fromObject(list); return jsonarray.toString(); } |
