文件内容转换成String、Json数据格式转换、Json文件序列化数据库总结

你的名字 2022-11-06 01:57 183阅读 0赞

需求：将json格式的文件序列化为一个对象、并存入数据库，文件内容如下：

{
    	"user": [{
    		"id": "1",
    		"user_name": "小米",
    		"age": "18",
    		"phone": "132677",
    		"CREATE_BY": "admin",
    		"CREATE_DATE": "2021-04-04 09:23:45",
    		"MODIFIED_BY": "admin",
    		"MODIFIED_DATE": "2021-05-01 09:23:45"
    	}],
    	"role": [{
    		"ID": "1",
    		"role_name": "普通用户"
    		"CREATE_BY": "admin",
    		"CREATE_DATE": "2021-04-04 09:23:45",
    		"MODIFIED_BY": "admin",
    		"MODIFIED_DATE": "2021-05-01 09:23:45"
    	}]
    }

整个文件是一个Json对象，由\{\}括起来，所以首先将读取文件内容

/**
     * 将文件内容读取成一个字符串
     */
    private String readFileAsString(MultipartFile file) {
        //读取文件，转化为String
        BufferedReader reader = null;
        String data = "";
        try {
            System.out.println(file.getName());
            InputStream inputStream = file.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
            reader = new BufferedReader(inputStreamReader);
            String tempString = null;
            while ((tempString = reader.readLine()) != null) {
                data += tempString;
            }
            reader.close();
    
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //关闭流对象
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return s;
    }

然后解析json字符串

JSONObject jsonObject = JSON.parseObject(s);

获取jsonObject 的key集合

Set<String> keys = jsonObject.keySet();

遍历key，获取value

keys.forEach(key -> {
                JSONArray jsonArray = jsonObject.getJSONArray(key);
                //四、对key进行表名判断
                if ("user".equalsIgnoreCase(key)) {
                    List<User> list = new ArrayList<>();
                    //五、遍历JSON数组
                    jsonArray.forEach(o -> {
                        User user = JSON.toJavaObject((JSONObject) o, User.class);
                        list.add(user );
                    });     
                    //批量插入数据库
                    userMapper.insertData(list);
                }else if("role".equalsIgnoreCase(key)){
                	 List<Role> list = new ArrayList<>();
                    //五、遍历JSON数组
                    jsonArray.forEach(o -> {
                        Role  role = JSON.toJavaObject((JSONObject) o, Role.class);
                        list.add(role );
                    });     
                    //批量插入数据库
                    roleMapper.insertData(list);
    			}
        });
    }