package csdn;

import java.io.*;
import java.util.*;

public class CountWords {
    public static void main(String[] a) {
        InnerCountWords icw = new InnerCountWords("words.txt");
        Map<String,Integer> result = icw.getResult();  //开始统计
        System.out.println(result);
    }
}

class InnerCountWords {
    private String fileName;
    
    public InnerCountWords(String fileName) {
        this.fileName = fileName;
    }
    
    public Map<String,Integer> getResult() {
        Map<String,Integer> result = new HashMap<String,Integer>();
        FileInputStream fis = null;
        
        try {
            fis = new FileInputStream(fileName);  //打开文件
            int in = 0;  //读入的字符
            StringBuffer sb = new StringBuffer();  //缓存单词
            in = fis.read();  //读入
            boolean notEnd = true;  //是否是文件尾
            
            while(notEnd) {
                if(-1 == in) {
                    notEnd = false;  //如果到文件尾,结束while
                }
                if(Character.isLetter((char)in)) {
                    sb.append((char)in);  //判断读入的是否是字母,如果是,就追加到StringBuffer
                } else {
                    //否则就判断StringBuffer里面是否有单词存在,如果有就加入到Map中
                    if(sb.length() > 0) {
                        if(result.containsKey(sb.toString())) {
                            result.put(sb.toString(), result.get(sb.toString()) + 1);
                        } else {
                            result.put(sb.toString(),1);
                        }
                    }
                    sb = new StringBuffer(); //重新设置StringBuffer
                }
                in = fis.read(); //读入字符
            }
            return result;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}