var jsonStr = JSON.stringify(list); var param= {}; param.jsonStr=jsonStr; 

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> 

JSONArray json = JSONArray.fromObject(object); String str = json.toString();//把json轉換為String 

/**   * @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;  } 

 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();  }