Java读取txt文件，并且对其文件内容进行统计排序

农村四月闲人少，勤学苦攻把名扬。这篇文章主要讲述Java读取txt文件，并且对其文件内容进行统计排序相关的知识，希望能为你提供帮助。
1、业务需求 : 根据使用量将下列数据进行排序然后按照使用量的高低进行数据展示
2、实现代码

import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.Comparator; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.function.BiConsumer; /** * Java读取txt文件，并且对其文件内容进行统计排序 * @author com * */ public class ClassInfoSort { static String str = null; static Map< String, Double> map1 = new HashMap< String, Double> (); // G static Map< String, Double> map2 = new HashMap< String, Double> (); // M static Map< String, Double> map3 = new HashMap< String, Double> (); // K static Map< String, Double> map4 = new HashMap< String, Double> (); // 0 public static void main(String[] args) { read(); output(); } public static void output() { List< Map.Entry< String, Double> > list1 = sort(map1); List< Map.Entry< String, Double> > list2 = sort(map2); List< Map.Entry< String, Double> > list3 = sort(map3); //List< Map.Entry< String, Double> > list4 = sort(map4); for (Entry< String,Double> entry : list1) { System.out.println(entry.getKey()+" "+entry.getValue()+" G"); } for (Entry< String,Double> entry : list2) { System.out.println(entry.getKey()+" "+entry.getValue()+" M"); } for (int i=0; i< list3.size(); i++) { System.out.println(list3.get(i).getKey()+" "+list3.get(i).getValue()+" K"); } map4.forEach(new BiConsumer< String, Double> () { @Override public void accept(String t, Double u) { System.out.println(t+" "+u+" B"); } }); } /** * map以value值降序排序，返回list< Map> * @param map * @return list */ public static List< Map.Entry< String, Double> > sort(Map< String,Double> map){ List< Map.Entry< String, Double> > list = new ArrayList< Map.Entry< String,Double> > (map.entrySet()); list.sort(new Comparator< Map.Entry< String, Double> > () { @Override public int compare(Entry< String, Double> o1, Entry< String, Double> o2) { return o2.getValue().compareTo(o1.getValue()); } }); return list; } /** * 读取文件，并筛选出user用户和对应的文件大小 */ public static void read() { File file = new File("作业1.txt"); FileInputStream fin = null; BufferedReader bfr = null; try { fin = new FileInputStream(file); bfr = new BufferedReader(new InputStreamReader(fin)); String str = null; String key = null; double value = https://www.songbingjia.com/android/0D; int n, n1; while ((str = bfr.readLine()) != null) { if (str.startsWith("0")) { // 0的情况 n = str.indexOf("/user/") + 6; key = str.substring(n); value = https://www.songbingjia.com/android/0; map4.put(key, value); } else if (str.contains(" G")) { // G的情况 n = str.indexOf("/user/") + 6; key = str.substring(n); n1 = str.indexOf(" G"); value = https://www.songbingjia.com/android/Double.parseDouble(str.substring(0, n1)); map1.put(key, value); } else if (str.contains(" M")) { // M的情况 n = str.indexOf("/user/") + 6; key = str.substring(n); n1 = str.indexOf(" M"); value = https://www.songbingjia.com/android/Double.parseDouble(str.substring(0, n1)); map2.put(key, value); } else if (str.contains(" K")) { // K的情况 n = str.indexOf("/user/") + 6; key = str.substring(n); n1 = str.indexOf(" K"); value = https://www.songbingjia.com/android/Double.parseDouble(str.substring(0, n1)); map3.put(key, value); } } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { fin.close(); } catch (IOException e) { e.printStackTrace(); } } }}

3、效果截图

文章图片

4、附件文件

业务需求 : 根据使用量将下列数据进行排序然后按照使用量的高低进行数据展示分组 --> 排序 --> 抽取数据 007 396.9 K --> java实现 396.9 K/user/007 593.5 K/user/12_hl 0/user/1LB 0/user/96256 701.3 M/user/Amanda 611.3 M/user/ChenQingkang 712.6 M/user/ChenQingkang12 943.0 K/user/DAIhe 9.8 M/user/DAIhe199713 0/user/Enning 47.9 M/user/Kung15 5.0 G/user/LT 105/user/LZY 611.3 M/user/LiuChengcheng12 76.4 M/user/Ruler13 420.6 K/user/Rulue13 7.0 K/user/TZM11 673.7 M/user/WangYun12 0/user/XXXXX 610.6 M/user/YC 12.2 M/user/YuanShiXiong13 31.2 M/user/anonymous 230/user/avro 2.8 G/user/bailina13 105.5 M/user/baoyu13 1.3 G/user/begin 618.7 M/user/caoenning15 673.5 M/user/caoguangzhou13 730.6 M/user/caohuyue13 613/user/caomingyang 4.5 G/user/caomingyang12 740.4 M/user/caowenhao13 0/user/caozhuang 996.1 M/user/caozhuang12 610.6 M/user/changjinfang15 0/user/chaoran2 4.7 G/user/chenbojie09 9.7 M/user/chengshaoqi10 1.4 G/user/chengzhen11 610.6 M/user/chenjianfei 623.7 M/user/chenjianfei13 3.6 M/user/chenjinbiao 1.6 K/user/chenjinbiao10 611.3 M/user/chenpeng15 195/user/chenqingakng12 3.5 G/user/chenqingkang12 3.5 G/user/chenshengjian13 412/user/chentao 611.3 M/user/chentao15 3.1 G/user/chenteng09 0/user/chenxuemeng09 3.6 G/user/chenyanzhang10 3.1 G/user/chihongfeng 0/user/chnegshaoqi10 0/user/daishirong 735.6 M/user/daishirong13 4.3 G/user/dangwenchao12 0/user/datafile 0/user/demo 0/user/dengmingfeng12 0/user/dengzongxin 4.1 G/user/dengzongxin13 965.6 M/user/dmf 1.3 G/user/donghao 420.7 K/user/donghao09 170.3 K/user/donghao10 1.6 G/user/dongwentao15 2.6 G/user/doudou 24/user/doupeng 326.9 M/user/doupeng08 8.7 K/user/dr.who 6.2 K/user/drz 609/user/dsr 8.7 M/user/duanheng 3.3 G/user/duanheng11 2.1 G/user/duruize08 0/user/duyang15 3.5 G/user/duzhuoyan 437.0 K/user/duzhuoyan10 310/user/dwt 88.2 M/user/etlproject11 0/user/examples 0/user/fangkun06 421.0 K/user/feng11 2.2 G/user/fengchangxiong 0/user/fengniu 171.8 K/user/fengyudong12 665.8 M/user/fengyudong13 2.7 G/user/frank 1.7 G/user/frank12 1.9 G/user/fuyongquan 0/user/fuyongquan11 19/user/gaga.txt 1.8 G/user/gaochuangxin 426.8 K/user/gaochuangxin09 226.4 M/user/gaodan13 333/user/gaopeng 1.3 G/user/gaopeng08 3.2 G/user/gaoyongzhong10 2.4 K/user/gongtao 0/user/gongtao08 420.6 K/user/gongtao09 135.3 M/user/group_10 615.4 M/user/guofengshuo13 481.5 M/user/guorui 1007.8 K/user/guorui11 0/user/guoshuaifu15 3.9 G/user/guoshuzhao15 1.7 G/user/guoying08 1.2 K/user/guozhuang10 1.3 G/user/gushuixa10 3.5 G/user/gushuxia10 428.6 K/user/gushuxia1010 409.7 M/user/h2o2 1.8 G/user/hadoop 24.9 G/user/hainiu 31.5 M/user/hainiu_report 0/user/hainiu_ypx 0/user/hainiureport 69/user/hajipingh12 443/user/hanzongqing10 2.9 G/user/haoluyang12 0/user/haoop 421.0 K/user/haowenxuan09 54/user/haozhenchao 3.1 G/user/haozhenchao09 0/user/hbase 0/user/hechaoyong 1.4 M/user/hehehe 418/user/hehuanwen 5.6 M/user/hehuanwen08 1.6 G/user/hejiping 1020.9 M/user/hejiping12 507.9 M/user/hejipint12 13.7 G/user/hekaifei15 611.3 M/user/hexiaodong15 1.8 G/user/heyong07 1.9 M/user/hezepei 144.4 K/user/hezhiwei 1.7 G/user/hezhiwei12 26.6 M/user/hhs 0/user/hianiu 2.8 G/user/hive 0/user/hive_r 0/user/hl 610.6 M/user/hl12 3.3 K/user/hly 78.2 K/user/hly12 0/user/hly12311 1.1 K/user/hnxywj11 93.9 M/user/houjun08 0/user/huahongxin 1.9 G/user/huahongxin09 614.5 M/user/huanglei15 2.3 G/user/huanglibao 1.6 G/user/huanglingyu11 692.6 M/user/huangshibo12 388/user/huangzhaohui 67.5 M/user/huangzhaohui09 325.3 K/user/huhongshun123 611.3 M/user/huhongshun12312 1.1 G/user/huzewen13 239/user/input_key 3.2 G/user/itlishuai 30.1 M/user/itls 0/user/jaiyujian07 36.1 M/user/jf 192/user/jiadelong 14.0 M/user/jiadelong10 0/user/jiakeyao 2.3 M/user/jiakeyao11 0/user/jiangliou 429.7 K/user/jiangliou09 60.5 M/user/jianglou09 89.6 M/user/jiangxin10 736.2 M/user/jiaofeng12 2.6 G/user/jiayujian 31.8 M/user/jiayujian07 71.3 K/user/jiayujianyujian07 1.6 G/user/jinfu 0/user/jinfu09 14.0 M/user/jinfu12 3.2 G/user/jingxin12 0/user/jinyanxi 0/user/jinyanxi10 884/user/jiping12 57/user/js_hn 610.6 M/user/kenan 647.7 M/user/kongfanxin15 611.4 M/user/kouxinyuan11 4.9 K/user/leelongbo11 669.8 M/user/leizhe13 699.2 M/user/leizijiao13 0/user/lenovo 610.6 M/user/liangsz123113 3.1 G/user/liangzhiyong09 611.4 M/user/liaosong15 0/user/liaoyisi 832.4 M/user/liaoyisi13 342.5 K/user/libo 171.8 K/user/lihong12 1.8 G/user/lijiarui08 3/user/lilongbo11 420.7 K/user/limeiling09 75.6 M/user/limin08 4.0 K/user/liming 3.3 G/user/liming12 2.7 G/user/linbin15 3.1 G/user/linjiawei09 1.3 G/user/linyuhong 614.3 M/user/linyuhong15 62.6 M/user/lipengfei10 19/user/lishengshi 1.3 G/user/lishuai 4.0 G/user/lishuai12 939.5 M/user/lishuai15 206.6 M/user/liubin13 1.8 G/user/liubo11 3.0 G/user/liubo15 1.1 K/user/liubowen 8.2 M/user/liubowen08 3.3 G/user/liuchao12 0/user/liuhao 2.8 G/user/liuhong12 610.6 M/user/liujianyang15 324.5 M/user/liuming 1016.4 M/user/liuming12 642.5 M/user/liumingyang15 49/user/liuniao 334.5 M/user/liuniao10 2.1 M/user/liunioa10 0/user/liupan 3.4 G/user/liupan10 468.1 M/user/liuqaing08 421.3 K/user/liuqiang08 1023.1 M/user/liushaopeng11 525.5 K/user/liushuhe11 0/user/liuxiaonan15 32.4 M/user/liuyuhuan 611.3 M/user/liuyuhuan13 661.2 M/user/liuzezhuo12 420.6 K/user/liuzhengxun 31.7 M/user/liuzhengxun13 420.6 K/user/liuzhenjiang09 322/user/liuzhipeng 2.2 M/user/liuzhipeng09 1.2 G/user/liuzhu15 290.7 M/user/lixiaoyao13 36.2 K/user/liyao 647.1 M/user/liyuan 672.1 M/user/liyuan12 468.8 M/user/lizhifeng10 3.0 G/user/liziquan12 24/user/ljiaofeng 0/user/llblilnogbo 0/user/llblilnogbo11 8.7 G/user/llblilongbo11 2.1 G/user/lp 1.3 G/user/lpf10 0/user/lsh 0/user/lsh11 0/user/lss12 0/user/lufeifei10 870/user/luo 5.1 G/user/luohantao08 611.3 M/user/luotao15 425.2 K/user/luozhenjiu08 25.8 K/user/luxihao 0/user/luxihap08 3.5 G/user/lvsicong10 841.3 K/user/lxy 4.5 M/user/lyn 468.3 M/user/ma11 1.6 G/user/majixian09 10.3 M/user/majixian10 586/user/mapreduce 32/user/mayaohong10 0/user/mayucheng 50.4 M/user/mayucheng10 30/user/mazhaolaing08 121.2 M/user/mazhaoliang08 2.2 G/user/mazhenxin10 0/user/mengxianbao 68.0 M/user/mengxianbao08 198.8 M/user/mitaotao 30.7 M/user/mitaotao10 1.3 G/user/mofan10 0/user/mr 0/user/mr_input 0/user/my 5.0 K/user/nan 1.2 G/user/nandingding12 6.6 K/user/nini 48.6 M/user/nini11 13.8 K/user/ninifairy 63.2 M/user/output 21.8 G/user/panniu 8.7 G/user/panyifan09 98/user/pawangpeng12 3.5 M/user/pd 320.8 M/user/pd15 0/user/pd15_out 5.8 G/user/pengdong15 1.2 G/user/penghui12 611.3 M/user/ph 1.5 G/user/qcy96101111 4.0 K/user/qiao 5.7 G/user/qiaoChunYu 0/user/qiaoqiao 1.9 M/user/qiaoshengxin09 718.7 M/user/qiaoshiyu12 21.1 G/user/qingniu 938.1 M/user/qiuji13 3.1 G/user/qiyi 3.1 G/user/quxin09 115.1 M/user/renchao 3.6 G/user/renxiaoting09 0/user/retail 0/user/root 0/user/ruler 3.7 K/user/ruler13 0/user/s1 1.1 G/user/shangmingxin09 4.8 G/user/shenbo12 416.3 M/user/shenpeng13 1.8 K/user/shichaoran 1.5 K/user/shichaoran.db 31.2 M/user/shichaoran08 0/user/shixiaolaing 0/user/shixiaoliang 11.2 M/user/shixiaoliang10 0/user/showtime 108/user/shu 4.1 G/user/shuyang 1.6 G/user/siniu 0/user/songifen09 0/user/songjia 3.3 G/user/songkang12 0/user/songlifeng009 1.4 G/user/songlifeng09 0/user/su 3.4 G/user/sunchengxun 16.0 K/user/sunchengxun11 1.2 G/user/suniu 1.9 G/user/sunsong08 20.6 M/user/suntiancheng10 20.2 K/user/sunxiuhua12 155.2 M/user/superl 704.9 M/user/suwenju12 3.2 G/user/suyuan09 356.0 M/user/suyuex12 3.8 G/user/swj 78/user/t1 0/user/t8 8.0 M/user/tengfei11 0/user/test1 3.0 G/user/test2 47.0 M/user/tianguoyan 588.5 K/user/tianguoyan09 0/user/tianxia 514.4 M/user/tianxiaoyu08 3.0 G/user/tongxilun10 0/user/user 2.7 G/user/vince 0/user/wang 420.7 K/user/wanganlei11 2.6 G/user/wangbin12 4.3 G/user/wangbowen12 707.5 M/user/wanghan15 328.5 M/user/wanghao10 1.3 G/user/wanghaowei10 649.7 M/user/wanghongyang12 366.4 M/user/wangjian11 62.7 M/user/wangjingqin08 583/user/wangjunteng09 3.8 G/user/wangjunwei12 20/user/wangkunyang 1.2 G/user/wangliumin11 420.6 K/user/wangliuming11 791.6 M/user/wanglongchao 3.7 G/user/wanglongchao12 8.2 G/user/wangming08 55.3 M/user/wangmingwei09 884.7 M/user/wangpeng12 0/user/wangqiang 3.6 G/user/wangqiang09 1.8 G/user/wangqinzheng 2.2 G/user/wangqinzheng10 1.7 G/user/wangruilin13 610.6 M/user/wangruiqiao15 575.2 M/user/wangshixing 310.5 M/user/wangshixing08 421.3 K/user/wangshizi 145.2 M/user/wangshizi08 2.6 M/user/wangshuaiang13 450.9 K/user/wangtongwei10 530/user/wangwei 90.1 M/user/wangwei10 0/user/wangxiaoyu 934/user/wangyanjie 2.8 G/user/wangyanjie12 482.2 K/user/wangyao 195.6 M/user/wangyao08 2.8 G/user/wangyu09 1.9 G/user/wangyue12 629.5 M/user/wangyun12 810.3 M/user/wangzhentao15 3.6 G/user/wangzuowei11 0/user/wanqh15 5.2 G/user/wanqiuhao15 0/user/wanyuan 621.0 M/user/wanyuan13 64.6 M/user/wcy 759.0 M/user/wcy12 644.1 M/user/weijiaxin12 392.4 M/user/weishucheng 657.0 M/user/weishucheng12 239/user/weiyixuan 700.6 M/user/weiyixuan12 630.8 M/user/wenluqi10 14/user/whw 347/user/wjq 3.1 G/user/wjt09 324.9 M/user/wlq 324.5 M/user/wtw 673.2 M/user/wubicheng15 3.1 G/user/wutenghui09 358.7 K/user/wuyue 896.2 M/user/wuyue13 3.6 G/user/wuzhaohua13 0/user/wuzhongxiu 423.8 K/user/wuzhongxiu11 0/user/wyp 8.2 K/user/wzt 8.9 K/user/xiakai10 637.5 M/user/xiangyongqiao15 0/user/xiaohaixao09 590.9 K/user/xiaohaixiao 3.1 G/user/xiaohaixiao09 174/user/xiaokey12 4.2 G/user/xiaokeya12 3.6 G/user/xiaoying10 1.6 G/user/xiaoyuan 482/user/xiaying10 102.6 M/user/xiedinghong10 0/user/xieidnghong10 503.3 M/user/xiexiandong09 1.8 G/user/xieyunfei11 1.5 G/user/xjy12 0/user/xubinjie15 171.2 K/user/xukun 3.5 G/user/xukun09 666.9 M/user/xunianxing13 0/user/xupengliang 9.0 K/user/xupengliang09 436/user/yangbojun09 1023.8 M/user/yangjianrong15 576.5 M/user/yangjinyao08 1.3 G/user/yangjiuyin10 52.9 M/user/yangkunyi08 4.2 K/user/yangshu11 0/user/yangxi 3.0 G/user/yangxi12 3.1 G/user/yanjiantong09 170.3 K/user/yanjiantong9 427.9 K/user/yanjianwen11 1.3 G/user/yanjun 249.8 M/user/yanjun07 0/user/yankun 1.4 M/user/yanpeng10 0/user/yanpengxu 46.4 M/user/yanpengxu10 298.1 K/user/yanujun07 968.7 M/user/yanyao13 702.6 M/user/yaoyao13 930.2 M/user/yinjian12 637.0 M/user/youcong132013 712/user/ypx 611.3 M/user/ysc13 46.8 M/user/ysp 28.5 M/user/yuanshibo10 0/user/yuanshixiong13 3.1 G/user/yuanxiongfei 2.0 G/user/yuanyingtai 6.1 K/user/yuanyingtai09 430.6 K/user/yumaowen 3.5 G/user/yumaowen10 610.6 M/user/yuqibo11 3.5 G/user/yusongping08 298.1 K/user/yusoongping08 0/user/zangjiazhen 367.5 M/user/zangjiazhen10 0/user/zangjizhen10 1.1 G/user/zhangbo12 223.2 M/user/zhangchaoping08 0/user/zhangchi10 4.4 G/user/zhangjiaojiao13 3.8 G/user/zhangjie10 0/user/zhangkejia09 0/user/zhangkejia09.db 610.7 M/user/zhangkenan15 38.0 M/user/zhanglong 4.4 M/user/zhanglong06 7.0 G/user/zhangqi12 3.6 G/user/zhangxiaoliang11 644.9 M/user/zhangxiaowei15 2.9 G/user/zhangxt12 4.9 K/user/zhangyanni11 589.9 M/user/zhangyifan 610.6 M/user/zhangyifan13 1.4 G/user/zhangyu12 673.7 M/user/zhaoguang12 41.6 M/user/zhaolixuan12 58.8 M/user/zhaomin08 4.6 G/user/zhaoqiang12 688.6 M/user/zhaoqiang13 0/user/zhaotianming10 5.3 G/user/zhaowenpei09 4.7 K/user/zhaoxingzhe11 778.7 M/user/zhaoxingzhe15 621.3 M/user/zhaoyankun15 9.1 K/user/zhaoyaokun15 1.0 G/user/zhengguoguang13 3.4 G/user/zhengsongsong10 641.9 M/user/zhijunwei13 9.0 M/user/zhongjinpeng11 716.7 M/user/zhoubin123113 0/user/zhoujian13 3.2 G/user/zhoujie12 965.4 M/user/zhouyang 501.2 K/user/zhouyang12 1.2 G/user/zhswh13 1.0 K/user/zhu 621.9 M/user/zhurundong15 407.8 M/user/zhwsh13 2.1 G/user/zjm 22.0 M/user/zjm12 2.7 G/user/zmh 1.1 G/user/zmh12 27.7 M/user/zouwenyao13 3.0 K/user/zouxiangyu 76.6 M/user/zouxiangyu08 757/user/zouxiangyu09 0/user/zrd 3.4 G/user/zzh

【Java读取txt文件，并且对其文件内容进行统计排序】