자바는 csv 및 txt 파일을 코드로 읽습니다.

package com.yanghuan.document;

import org.apache.commons.lang3.StringUtils;

import java.io.BufferedReader;
import java.io.FileReader;
import java.util.HashMap;
import java.util.Map;

public class DocumentCompare {
    public static void main(String[] args) {
        try{
            obtainAppIdAndDeviceIdOfTxt();
        } catch (Exception e){
            System.out.println("ffff---"+e);
        }

    }
    
    //读入csv文件到内存
    public static Map<String, String> obtainAppIdAndDeviceId() throws Exception {
        //创建字符缓冲输入流对象
        BufferedReader br = new BufferedReader(new FileReader("D:\\0\\sn.csv"));
        String line;
        Map<String,String> map=new HashMap<String,String>();
        while ((line = br.readLine()) != null) {
            if(StringUtils.isBlank(line)){
                continue;
            }
            String item[] = line.split(",");//CSV格式文件为逗号分隔符文件，这里根据逗号切分
            String s1=item[0];
            String dev=null;
            if(!s1.contains(":")){
                dev=s1.substring(s1.lastIndexOf(":")+1).replaceAll("\"", "").replaceAll("}", "");
            }
            for(int i=0;i<item.length;i++){
                String nb=item[i];
                if(!nb.contains("app")){
                    continue;
                }
                //比如nb为{"app":"FHJKLMK"}，则通过下面的substring后为app为"FHJKLMK"
                String app=nb.substring(nb.lastIndexOf(":")+1).replaceAll("\"", "").replaceAll("}", "");
                map.put(dev,app);
                System.out.println("dev--"+dev+"---app:"+app);
            }
        }
        //释放资源
        br.close();
        return map;
    }

    
    //读入txt文件到内存代码
    public static Map<String, String> obtainDeviceIdOfTxt() throws Exception {
        //创建字符缓冲输入流对象
        BufferedReader br = new BufferedReader(new FileReader("D:\\0\\smm.txt"));
        String line;
        Map<String,String> map=new HashMap<String,String>();
        while ((line = br.readLine()) != null) {
            if(StringUtils.isBlank(line)){
                continue;
            }
            String item[] = line.split("------");
            String s1=item[0];
            map.put(s1,s1);
        }
        //释放资源
        br.close();
        return map;
    }

// 데이터를 입력해야합니다. 
public static void writeDataToTxt (Map <String, String> result) throws Exception { 
    String line = System.getProperty ( "line.separator"); 
    StringBuffer str = 새로운 StringBuffer (); 
    FileWriter fw = new FileWriter ( "D : \\ 0 \\ redisDataEnd.txt", true); 
    for (Map.Entry <String, String> entry : result.entrySet ()) { 
        str.append (entry.getKey () + ":"+ entry.getValue ()). append (line); 
    } 
    fw.write (str.toString ()); 
    fw.close (); 
}

}