package com.lookcoder.inschool.utils; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.nio.charset.StandardCharsets; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * title: 清除注释 */ public class ClearComment { public static void main(String[] args) throws FileNotFoundException { String rootDir = "E:\文档\SpringWebMvcSource\spring-webmvc-4.3.9.RELEASE-sources"; deepDir(rootDir); } private static void deepDir(String rootDir) throws FileNotFoundException { File folder = new File(rootDir); if (folder.isDirectory()) { String[] files = folder.list(); if (files != null) { for (String file1 : files) { File file = new File(folder, file1); if (file.isDirectory() && !file.isHidden()) { deepDir(file.getPath()); } else if (file.isFile() && file.getName().endsWith(".java")) { clearComment(file.getPath()); } } } } else if (folder.isFile() && folder.getName().endsWith(".java")) { clearComment(folder.getPath()); } } private static void clearComment(String filePathAndName) throws FileNotFoundException { StringBuilder buffer = new StringBuilder(); String line = null; // 用来保存每行读取的内容 InputStream is = new FileInputStream(filePathAndName); BufferedReader reader = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8)); try { line = reader.readLine(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } // 读取第一行 while (line != null) { // 如果 line 为空说明读完了 buffer.append(line); // 将读到的内容添加到 buffer 中 buffer.append(" "); // 添加换行符 try { line = reader.readLine(); } catch (IOException e) { e.printStackTrace(); } // 读取下一行 } // 1、清除单行的注释,如: //某某,正则为 ://.* // 2、清除单行的注释,如:/** 某某 */,正则为:/**.**/ // 3、清除单行的注释,如:/* 某某 */,正则为:/*.**/ // 4、清除多行的注释,如: // /* 某某1 // 某某2 // */ // 正则为:.*/*(.*)*/.* // 5、清除多行的注释,如: // /** 某某1 // 某某2 // */ // 正则为:/**(s**s*.*s*?)* String filecontent = buffer.toString(); Map<String, String> patterns = new HashMap<String, String>(); patterns.put("([^:])\/\/.*", "$1");// 匹配在非冒号后面的注释,此时就不到再遇到http:// patterns.put("\s+\/\/.*", "");// 匹配“//”前是空白符的注释 patterns.put("^\/\/.*", ""); patterns.put("^\/\*\*.*\*\/$", ""); patterns.put("\/\*.*\*\/", ""); patterns.put("/\*(\s*\*\s*.*\s*?)*\*\/", ""); //patterns.put("/\*(\s*\*?\s*.*\s*?)*", ""); Iterator<String> keys = patterns.keySet().iterator(); String key, value; while (keys.hasNext()) { // 经过多次替换 key = keys.next(); value = patterns.get(key); filecontent = replaceAll(filecontent, key, value); } // 再输出到原文件 try { File f = new File(filePathAndName); if (!f.getParentFile().exists()) { final boolean mkdirs = f.getParentFile().mkdirs(); } FileOutputStream out = new FileOutputStream(filePathAndName); byte[] bytes = filecontent.getBytes(StandardCharsets.UTF_8); out.write(bytes); out.flush(); out.close(); } catch (IOException e) { e.printStackTrace(); } } /** * @param fileContent 内容 * @param patternString 匹配的正则表达式 * @param replace 替换的内容 */ public static String replaceAll(String fileContent, String patternString, String replace) { String str = ""; Matcher m; Pattern p; try { p = Pattern.compile(patternString); m = p.matcher(fileContent); str = m.replaceAll(replace); } catch (Exception e) { e.printStackTrace(); } return str; } }