使用正则表达式做代码统计

本源码来自马士兵视频教程。存档，以便以后使用。

 import java.io.BufferedReader;import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;public class CodeCounter {static long normalLines = 0; //代码行static long commentLines = 0; //注释行static long whiteLines = 0; //空白行public static void main(String[] args) {File f = new File("D://share//JavaProjects//TankWar1.9.11//src");File[] codeFiles = f.listFiles(); //取得目录下所有文件for(File child : codeFiles){if(child.getName().matches(".*//.java$")) { //取java源文件parse(child);}}System.out.println("normalLines:" + normalLines);System.out.println("commentLines:" + commentLines);System.out.println("whiteLines:" + whiteLines);}private static void parse(File f) {BufferedReader br = null;boolean comment = false;try {br = new BufferedReader(new FileReader(f));String line = "";while((line = br.readLine()) != null) { //readLine会去掉末尾的换行符否则是^[//s&&[^//n]]*//n$"line = line.trim();if(line.matches("^[//s&&[^//n]]*$")) { //读取空行whiteLines ++;} else if (line.startsWith("/*") && !line.endsWith("*/")) {commentLines ++;comment = true;} else if (line.startsWith("/*") && line.endsWith("*/")) {commentLines ++;} else if (true == comment) {commentLines ++;if(line.endsWith("*/")) {comment = false;}} else if (line.startsWith("//")) {commentLines ++;} else {normalLines ++;}}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {if(br != null) {try {br.close();br = null;} catch (IOException e) {e.printStackTrace();}}}}}