课堂测试3

 1 import java.io.*;
 2 import java.util.*;
 3 import javax.print.DocFlavor;
 4 import javax.swing.*;
 5 
 6 
 7 
 8 public class Main {
 9     public static Map<String, Integer>map=new HashMap<>();
10     public static void main(String[] args) {
11         Scanner sc=new Scanner(System.in);
12         System.out.println("请输入目录路径:");
13         String path=sc.next();
14         File di=new File(path);
15         dfs(di);
16         System.out.println("请输入n:");
17         int n=sc.nextInt();
18         List<Map.Entry<String,Integer>>list=new ArrayList<>(map.entrySet());
19         list.sort(new Comparator<Map.Entry<String, Integer>>() {
20             @Override
21             public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
22                 return o2.getValue().compareTo(o1.getValue());
23             }
24         });
25         try(PrintWriter wirter=new PrintWriter ("cnt.txt")){
26             int idx=0;
27             for(Map.Entry<String,Integer> mp:list){
28                 idx++;
29                 if(idx==1)continue;
30                 wirter.print(mp.getKey());
31                 wirter.print(' ');
32                 wirter.print(mp.getValue());
33                 wirter.println();
34                 if(idx==n+1)break;
35             }
36         }
37         catch (FileNotFoundException e){
38             e.printStackTrace();
39         }
40 
41     }
42     public static void dfs(File di){
43         if(!di.exists()||!di.isDirectory()){
44             return;
45         }
46         File[] files=di.listFiles();
47         for(File file:files){
48             if(file.isFile()){
49                 try (Scanner scanner = new Scanner(new BufferedReader(new FileReader(
50                 file.getAbsoluteFile())));) {
51                     scanner.useDelimiter("[,| |.|?|!|-]");
52                     while (scanner.hasNext()) {
53                         String s= scanner.next();
54                         boolean f=false;
55                         for(int i=0;i<s.length();i++){
56                             if(s.charAt(i)<'a'||s.charAt(i)>'z'){
57                                 f=true;break;
58                             }
59                         }
60                         if(f)continue;
61                         if(map.containsKey(s))map.put(s,map.get(s)+1);
62                         else map.put(s,1);
63                     }
64                 } catch (FileNotFoundException e) {
65 
66                     e.printStackTrace();
67                 }
68             }else if(file.isDirectory()){
69                 dfs(file);
70             }
71         }
72     }
73 }