這個依賴很重要，我們將圍繞fastjson中的JSONObject這個類來談轉換

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.15</version>
</dependency>


1. String轉成JSON

String json = "{"abc":"1","hahah":"2"}";
JSONObject jsonObject = JSONObject.parseObject(content);
一句話就能解決，非常便捷。
想要取出值，可以對`jsonObject`進行操作：
jsonObject.getString("abc");
結果為：`1`


1. 將String轉為list後轉為JSON

List<String> list = new ArrayList<String>();
list.add("username");
list.add("age");
list.add("sex");
JSONArray array = new JSONArray();
array.add(list);


1. 將String轉為map後轉為JSON

Map<String, String> map = new HashMap<String, String>();
map.put("abc", "abc");
map.put("def", "efg");
JSONArray array_test = new JSONArray();
array_test.add(map);
JSONObject jsonObject = JSONObject.fromObject(map);


特別注意:從JSONObject中取值，碰到了數字為key的時候，如

{
"userAnswer": {
"28568": {
"28552": {
"qId": "28552",
"order": "1",
"userScore": {
"score": 100
},
"answer": {
"28554": "28554"
},
"qScore": "100.0",
"qtype": "SingleChoice",
"sId": "28568"
}
}
},
"paperType": "1",
"paperOid": "28567",
"instanceId": 30823,
"remainingTime": -1,
"examOid": "28570"
}
獲取「userAnswer」的value,再轉成JSON,可仿照如下形式：
JSONObject userJson = JSONObject.parseObject(jsonObject.getString("userAnswer"));
但是想獲取key"28568"就沒這麼容易了。直接像上述的寫法，會報錯。
我們瀏覽fastjson中的源碼，總結下，應該如下寫：
JSONObject question = (JSONObject) JSONObject.parseObject(section.getString("28568"), Object.class);


整體代碼：

dao代碼很容易，就不貼出來了。
package com.xiamenair.training.business.service;

import com.alibaba.fastjson.JSONObject;
import com.xiamenair.training.business.dao.elearningdao.ELearningExamInstanceDao;
import com.xiamenair.training.business.dao.masterdao.ELearningChoiceRecordDao;
import com.xiamenair.training.business.model.LasChoiceRecord;
import com.xiamenair.training.business.model.entity.elearning.LasExamInstance;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.sql.Blob;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.*;

@Service
public class ChoiceRecordService {

//查詢數據Dao
@Autowired
private ELearningChoiceRecordDao eLearningChoiceRecordDao;

//轉儲數據Dao
@Autowired
private ELearningExamInstanceDao eLearningExamInstanceDao;

private ChoiceRecordService() {
}

private static class SingletonRecordInstance {
private static final LasChoiceRecord choiceRecord = new LasChoiceRecord();
}

public static LasChoiceRecord getMapInstance() {
return SingletonRecordInstance.choiceRecord;
}

private static SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");

/**
* 定時任務，每天定時將E學網考試數據分析並轉儲
*
* @param : instanceIdList
* @return : void
* @author : 28370·皮育才
* @date : 2018/11/20
**/
@Scheduled(cron = "00 00 01 * * ?")
public void analysisChoiceRecord() {
//獲取前一天的時間
Date date = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(calendar.DATE, -1);
date = calendar.getTime();
String dateString = simpleDateFormat.format(date);
List<BigDecimal> instanceIdList = eLearningExamInstanceDao.findInstanceIdByFinishTime(dateString);
if(0 != instanceIdList.size()){
LasChoiceRecord lasChoiceRecord = getMapInstance();
instanceIdList.stream().forEach(instanceId -> {
Blob answerBlob = eLearningExamInstanceDao.findUserAnswer(instanceId);
Long userId = eLearningExamInstanceDao.findUserId(instanceId);
String content = null;
try {
content = new String(answerBlob.getBytes((long) 1, (int) answerBlob.length()));
} catch (SQLException e) {
e.printStackTrace();
System.out.println("SQLEXCEPTION:" + e);
}
JSONObject jsonObject = JSONObject.parseObject(content);
//針對本section的"公共"屬性直接設置
lasChoiceRecord.setUserId(userId);
lasChoiceRecord.setPaperType(jsonObject.getString("paperType"));
lasChoiceRecord.setPaperId(jsonObject.getString("paperOid"));
lasChoiceRecord.setExamInstanceId(jsonObject.getString("instanceId"));
lasChoiceRecord.setRemainingTime(jsonObject.getString("remainingTime"));
lasChoiceRecord.setExamId(jsonObject.getString("examOid"));
//針對section中的題目進行細化循環拆分
JSONObject userJson = JSONObject.parseObject(jsonObject.getString("userAnswer"));
Set sectionSet = userJson.keySet();
Iterator<String> setIt = sectionSet.iterator();
analyzeAnswer(lasChoiceRecord, userJson, setIt);
});
}
}

private void analyzeAnswer(LasChoiceRecord lasChoiceRecord, JSONObject userJson, Iterator<String> setIt) {
while (setIt.hasNext()) {
//對每個question進行再次拆分出題目
JSONObject section = (JSONObject) JSONObject.parseObject(userJson.getString(setIt.next()), Object.class);
Set questionSet = section.keySet();
Iterator<String> queIt = questionSet.iterator();
while (queIt.hasNext()) {
JSONObject question = (JSONObject) JSONObject.parseObject(section.getString(queIt.next()), Object.class);
String userAnswer = question.getString("answer");
String userScore = question.getString("userScore");
lasChoiceRecord.setQuestionId(question.getString("qId"));
lasChoiceRecord.setRecordId(UUID.randomUUID().toString());
eLearningChoiceRecordDao.save(lasChoiceRecord);
}

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