关于转换：fastjson2中的JSONObject，转化

fastjson

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项目地址：https://gitcode.com/gh_mirrors/fastj/fastjson

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微笑の天使

9420人浏览 · 2021-08-26 11:15:23

微笑の天使 · 2021-08-26 11:15:23 发布

两种都试下：

旧：

<!-- fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.83</version>
</dependency>

导入：

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

新：

pom:

<!-- Alibaba Fastjson -->
<dependency>
    <groupId>com.alibaba.fastjson2</groupId>
    <artifactId>fastjson2</artifactId>
    <version>2.0.25</version>
</dependency>

导入：

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONArray;
import com.alibaba.fastjson2.JSONObject;

主要：

转成string：JSON.toJSONString（ClassObject）

把string转成一个对象：JSONObject.parseObject (String)、JSONObject.parse(String)

---------------------------------------------------------------------------------------

序列化、反序列化：

---------------------------------------------------------------------------------------------------------------------------------

string字符串转成json：

实例1：

实例2：

/**
 * 判断波开放平台响应内容是否成功
 *
 * @param responseText 波开放平台响应内容
 * @return boolean true：成功，false：失败
 */
public static NbcbResponse isSuccessOrExists(String responseText) {
    NbcbResponse nbcbResponse = new NbcbResponse();
    nbcbResponse.setSuccess(true);
    JSONObject jsonObject = JSON.parseObject(responseText);
    JSONArray retArray = jsonObject.getJSONObject("Data").getJSONObject("sysHead").getJSONArray("ret");
    JSONObject retObject = (JSONObject) retArray.get(0);
    String retCode = retObject.getString("retCode");
    String retMsg = retObject.getString("retMsg");
    boolean boolSuccess = StringUtils.equalsIgnoreCase(SDK_SUCCESS, retCode);
    boolean boolExists = StringUtils.equalsIgnoreCase(SDK_EXISTS, retCode);
    boolean boolInuses = StringUtils.equalsIgnoreCase(SDK_INUSE, retCode);
    if (!(boolSuccess || boolExists || boolInuses)) {
        log.error("波开放平台响应异常--->{}", responseText);
        nbcbResponse.setRetMsg(retMsg);
        nbcbResponse.setSuccess(false);
        return nbcbResponse;
    }
    return nbcbResponse;
}

实体类转成String类型：

实例：

res:

{
    "code":200,
    "message":"success",
    "data":{
        "originGoodsId":"18823459",
        "smartlinkGoodsId":1687039855971872769
    },
    "timestamp":1691056620021
}

//返回拿到res是个string

String res = new String(result.getBody(), StandardCharsets.UTF_8);
// String转成Json对象，JSONObject.parseObject(string) 助记：解析为对象
JSONObject jsonObject = JSONObject.parseObject(res);
// 从json对象中获取值，jsonObject.getString("")
String code = jsonObject.getString("code");
log.error("code:{}", code);
if ("200".equals(code)){
    String data = jsonObject.getString("data");
    String s = JSON.toJSONString(data);
    JSONObject dataJson = JSONObject.parseObject(data);

    FawGoods fawGoods = BeanUtils.convert(goodsInsertRequest, FawGoods.class);
    fawGoods.setSmartlinkGoodsId((Long) dataJson.get("smartlinkGoodsId"));
    // json对象中取值 jsonObject.get（）    
    fawGoods.setCreateTime((Date) jsonObject.get("timestamp"));

实例：

String reqBody;
Object reg = JSONObject.parse(reqBody)

实例：

解析成对象，用指定的实体接收：

MerchantPlaceOrderObResponse merchantPlaceOrderObResponse = JSONObject.parseObject(jsonObjectString, MerchantPlaceOrderObResponse.class);

---------------------------------------------------------------------------------------------------------------------------------

json string字符串、以及 json string字符串中取值

实例：

s.toString()：

UsermInfoResponse[refrenceId=1197235249382576128, deptId=1386143669026902016, deptName='null', postId=1381730475239886848, postName='null', userAccount='18067413780', userPasswd='123123', userSalt='null', userName='刘先生', userHeader='https://jiangshen56.oss-cn-hangzhou.aliyuncs.com/freight/20220824/138827627892213350.png', userMobile='18667413789', userMark='=备注说明=', userAdmin=true, orgAdmin=true, userPrivate=false, userState=0, expireTime='null', loginAddr='12.246.52.231', loginTime='2023-03-08 14:24:27', loginNum=2, createTime='2022-08-25 09:14:34', updateTime='2023-03-08 14:24:27']

参数特征：最外层是[ ], 里面是逗号隔开，每个key和value是等于

String s1 = JSONUtils.toJSONString(s); //实际就是fastJson的SON.toJSONString()

结果转成了 json string字符串：

s1:{
   "createTime":"2022-08-25 09:14:34",
   "deptId":"1386143669026902016",
   "deptName":"",
   "expireTime":"",
   "loginAddr":"12.246.52.231",
   "loginNum":2,
   "loginTime":"2023-03-08 14:24:27",
   "orgAdmin":true,
   "postId":"1381730475239886848",
   "postName":"",
   "refrenceId":"1197235249382576128",
   "updateTime":"2023-03-08 14:24:27",
   "userAccount":"18667413780",
   "userAdmin":true,
   "userHeader":"https://jiangshen56.oss-cn-hangzhou.aliyuncs.com/freight/20220824/138827627892213350.png",
   "userMark":"=备注说明=",
   "userMobile":"18667413789",
   "userName":"刘先生",
   "userPasswd":"123123",
   "userPrivate":false,
   "userSalt":"",
   "userState":0
}

再获取s1 json string字符串中的key的值：

JSONObject jsonObject = JSONObject.parseObject(s1);
String str4 = jsonObject.getString("userPasswd");
log.error("str4:{}", str4);

结果：

str4:123123

上面实例参考自以下：

java Object获取属性_java object 获取属性_白snow的博客-CSDN博客

准备：

Ulog ulog = new Ulog();
ulog.setDesc("这是描述");
ulog.setTime((new Timer()).toString());
ulog.setName("日志");

Object obj = ulog;

获取所有：

Method[] declaredMethods = obj.getClass().getDeclaredMethods();
    for(Method method:declaredMethods){
        if(method.getName().startsWith("get")){
            Object o= null;
            try {
                o = method.invoke(obj);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }
            System.out.println("属性值get方法->"+o);
        }
    }

结果：

单个属性：

try {
     Field name = obj.getClass().getDeclaredField("name");
       name.setAccessible(true);
       try {
           System.out.println(name.get(obj).toString());
       } catch (IllegalAccessException e) {
           e.printStackTrace();
       }
       System.out.println();
   } catch (NoSuchFieldException e) {
       e.printStackTrace();
   }

结果：

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来源: pipicai96

String转成JSON的实现_136.la

作者：pipicai96

简介这篇文章主要介绍了String转成JSON的实现以及相关的经验技巧，文章约6798字，浏览量292，点赞数3，值得参考！

String转成JSON

这个依赖很重要，我们将围绕fastjson中的JSONObject这个类来谈转换

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

String转成JSON

String json = "{"abc":"1","hahah":"2"}";
JSONObject jsonObject = JSONObject.parseObject(content);

一句话就能解决，非常便捷。
想要取出值，可以对`jsonObject`进行操作：

jsonObject.getString("abc");

结果为：`1`

将String转为list后转为JSON

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

将String转为map后转为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);

特别注意:从JSONObject中取值，碰到了数字为key的时候，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"
}

获取“userAnswer”的value,再转成JSON,可仿照如下形式：

JSONObject userJson = JSONObject.parseObject(jsonObject.getString("userAnswer"));

但是想获取key"28568"就没这么容易了。直接像上述的写法，会报错。
我们浏览fastjson中的源码，总结下，应该如下写：

JSONObject question = (JSONObject) JSONObject.parseObject(section.getString("28568"), Object.class);

整体代码：

dao代码很容易，就不贴出来了。
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 {

    //查询数据Dao
    @Autowired
    private ELearningChoiceRecordDao eLearningChoiceRecordDao;

    //转储数据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");

    /**
     * 定时任务，每天定时将E学网考试数据分析并转储
     *
     * @param : instanceIdList
     * @return : void
     * @author : 28370·皮育才
     * @date : 2018/11/20
     **/
    @Scheduled(cron = "00 00 01 * * ?")
    public void analysisChoiceRecord() {
        //获取前一天的时间
        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);
                //针对本section的"公共"属性直接设置
                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"));
                //针对section中的题目进行细化循环拆分
                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()) {
            //对每个question进行再次拆分出题目
            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);
            }
        }
    }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。原文地址：https://www.cnblogs.com/pipicai96/p/9986181.html