Java读取txt文件，并且对其文件内容进行统计排序
Posted 静谧星空
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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 = 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 = 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 = 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 = 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 = 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
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
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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
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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
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328.5 M /user/wanghao10
1.3 G /user/wanghaowei10
649.7 M /user/wanghongyang12
366.4 M /user/wangjian11
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3.8 G /user/wangjunwei12
20 /user/wangkunyang
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420.6 K /user/wangliuming11
791.6 M /user/wanglongchao
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8.2 G /user/wangming08
55.3 M /user/wangmingwei09
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0 /user/wangqiang
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1.8 G /user/wangqinzheng
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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
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482.2 K /user/wangyao
195.6 M /user/wangyao08
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629.5 M /user/wangyun12
810.3 M /user/wangzhentao15
3.6 G /user/wangzuowei11
0 /user/wanqh15
5.2 G /user/wanqiuhao15
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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
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358.7 K /user/wuyue
896.2 M /user/wuyue13
3.6 G /user/wuzhaohua13
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0 /user/wyp
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1.6 G /user/xiaoyuan
482 /user/xiaying10
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1.5 G /user/xjy12
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171.2 K /user/xukun
3.5 G /user/xukun09
666.9 M /user/xunianxing13
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436 /user/yangbojun09
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170.3 K /user/yanjiantong9
427.9 K /user/yanjianwen11
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249.8 M /user/yanjun07
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1.4 M /user/yanpeng10
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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
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46.8 M /user/ysp
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2.0 G /user/yuanyingtai
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430.6 K /user/yumaowen
3.5 G /user/yumaowen10
610.6 M /user/yuqibo11
3.5 G /user/yusongping08
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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
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7.0 G /user/zhangqi12
3.6 G /user/zhangxiaoliang11
644.9 M /user/zhangxiaowei15
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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
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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
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