统计文档中单词出现频率

 1 import java.io.BufferedReader;
 2 import java.io.File;
 3 import java.io.FileReader;
 4 import java.io.IOException;
 5 import java.util.Arrays;
 6 import java.util.HashMap;
 7 import java.util.Iterator;
 8 import java.util.Map;
 9 import java.util.Map.Entry;
10 public class Search {
11     public void ReadBook()throws Exception
12     {
13         String book=book("D:/book.txt");
14         System.out.println(book);
15     }
16 
17     private static String book(String file) throws IOException
18     {
19         // TODO Auto-generated method stub
20         File f=new File(file);
21         BufferedReader bf=new BufferedReader(new FileReader(f));
22         String content="";
23         int lenth=0;
24         int x=0;
25         StringBuilder sb=new StringBuilder();
26         String[] sum= {""};
27         while(content!=null)
28         {
29             
30                 content= bf.readLine();
31             if(content==null)
32                 break;
33             
34             content=content.replace(",","");
35             content=content.replace(".","");
36             content=content.replace(";","");
37             content=content.replace("(","");
38             content=content.replace(")","");
39             String[] temp = content.split(" ");
40             
41             int length1=temp.length;
42             
43             int length2=sum.length;
44             sum = Arrays.copyOf(sum, length2 + length1);// 扩容
45 //            System.out.println("???");
46             x=0;
47             for(lenth=length2;lenth<(length1+length2);lenth++)
48             {
49                 
50                 sum[lenth]=temp[x];
51                 x++;
52             }
53 //            for(int xx=0;xx<sum.length;xx++)
54 //            {
55 //                System.out.println(sum[xx]);
56 //            }
57            Map<String,Integer> map=new HashMap<String,Integer>();
58            for(String str : sum){
59                if(map.containsKey(str)){
60                    map.put(str, map.get(str) + 1);
61                }else{
62                    map.put(str, 1);
63                }
64            }
65            Iterator<Entry<String, Integer>> it = map.entrySet().iterator();
66             while(it.hasNext()){
67                 Entry ex = (Entry) it.next();
68                 System.out.println(ex.getKey() + ":" + ex.getValue());
69 
70         }
71         
72         
73         
74         
75     }
76         bf.close();
77         return sb.toString();
78     }
79 }

 1 public class main {
 2 
 3     public static void main(String[] args) throws Exception {
 4         // TODO Auto-generated method stub
 5         Search s=new Search();
 6         s.ReadBook();
 7         
 8         
 9         
10     }
11 
12 }