统计文档中单词出现频率

一.先贴出自己的代码

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
public class Search {
    public void ReadBook()throws Exception
    {
        String book=book("D:/book.txt");
        System.out.println(book);
    }

    private static String book(String file) throws IOException
    {
        // TODO Auto-generated method stub
        File f=new File(file);
        BufferedReader bf=new BufferedReader(new FileReader(f));
        String content="";
        int lenth=0;
        int x=0;
        StringBuilder sb=new StringBuilder();
        String[] sum= {""};
        while(content!=null)
        {
            
                content= bf.readLine();
            if(content==null)
                break;
            
            content=content.replace(",","");
            content=content.replace(".","");
            content=content.replace(";","");
            content=content.replace("(","");
            content=content.replace(")","");
            String[] temp = content.split(" ");
            
            int length1=temp.length;
            
            int length2=sum.length;
            sum = Arrays.copyOf(sum, length2 + length1);// 扩容
//            System.out.println("???");
            x=0;
            for(lenth=length2;lenth<(length1+length2);lenth++)
            {
                
                sum[lenth]=temp[x];
                x++;
            }
//            for(int xx=0;xx<sum.length;xx++)
//            {
//                System.out.println(sum[xx]);
//            }
           Map<String,Integer> map=new HashMap<String,Integer>();
           for(String str : sum){
               if(map.containsKey(str)){
                   map.put(str, map.get(str) + 1);
               }else{
                   map.put(str, 1);
               }
           }
           Iterator<Entry<String, Integer>> it = map.entrySet().iterator();
            while(it.hasNext()){
                Entry ex = (Entry) it.next();
                System.out.println(ex.getKey() + ":" + ex.getValue());

        }
        
        
        
        
    }
        bf.close();
        return sb.toString();
    }
}

public class main {

    public static void main(String[] args) throws Exception {
        // TODO Auto-generated method stub
        Search s=new Search();
        s.ReadBook();
        
        
        
    }

}

二.思路

    1.当时看到实验题目第一反应就是要读文件，然后也没有多想，就去先搞文件

    2.文件搞完了，就去想想要去吧符号去掉，然后在把所有的单词整合到一起

    3.最后就是用方法进行统计