读取一个目录中的文件，并且统计其中的字母，数字，空格的个数以及行数

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代码实现：

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/**
 * @author:LYL
 * @date:2011-3-9,下午04:34:23
 * 读取一个目录中的文件，并且统计其中的字母，数字，空格的个数以及行数
 */
package com.lyl.exercise;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class Statistics {

	String path = null;

	public Statistics(String path) {
		this.path = path;
	}

	// 获取文件列表
	public File[] getFile() {
		File file = new File(this.path);
		File[] files = file.listFiles();
		return files;
	}

	// 获得缓冲
	public BufferedReader getBuffer(File file) {
		FileReader fr = null;
		BufferedReader br = null;
		try {
			fr = new FileReader(file);
			br = new BufferedReader(fr);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return br;
	}

	// 获得结果数组
	public int[] getResults(BufferedReader br) {
		String line = null;
		int letters = 0;
		int numbers = 0;
		int spaces = 0;
		int lines = 0;
		int results[];
		try {
			while ((line = br.readLine()) != null) {
				for (int i = 0; i < line.length(); i++) {
					if (line.charAt(i) >= 'a' && line.charAt(i) <= 'z'
							|| line.charAt(i) >= 'A' && line.charAt(i) <= 'Z') {
						letters++;
					}
					if (line.charAt(i) >= '0' && line.charAt(i) <= '9') {
						numbers++;
					}
					if (line.charAt(i) == 32) {
						spaces++;
					}
				}
				lines++;
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				br.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		results = new int[] { letters, numbers, spaces, lines };
		return results;
	}

	public static void main(String[] args) {
		Statistics st = new Statistics("E:" + File.separator + "Exercise");
		File files[] = st.getFile();
		int results[];
		for (int i = 0; i < files.length; i++) {
			if (files[i].isFile()) {
				BufferedReader br = st.getBuffer(files[i]);
				results = st.getResults(br);
				System.out.println(files[i]);
				System.out.println("字母的个数：" + results[0] + "\n数字个数："
						+ results[1] + "\n空格个数：" + results[2] + "\n行数："
						+ results[3]);
			}
		}
	}
}