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]); } } }}