在前端:
1.如果json是List对象转换的,可以直接遍历json,读取数据。
2.如果是需要把前端的List对象转换为json传到后台,param是ajax的参数,那么转换如下所示:
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var jsonStr = JSON.stringify(list); var param= {}; param.jsonStr=jsonStr; |
在后台:
1.把String转换为List(str转换为list)
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List<T> list = new ArrayList<T>(); JSONArray jsonArray = JSONArray.fromObject(str); //把String转换为json list = JSONArray.toList(jsonArray,t); //这里的t是Class<T> |
2.把List转换为json
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JSONArray json = JSONArray.fromObject(object); String str = json.toString(); //把json转换为String |
eg:
1. 根据页面用户输入的信息形成 Answer 对象的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; } /** * 将一个json字串转为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. 将一个 Answer 对象的List 生成Json字串,是根据客户端页面用户输入的信息生成的
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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(); } |