清除JAVA 項目中的註釋

 

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: 清除註釋
 */
public class ClearComment {

    public static void main(String[] args) throws FileNotFoundException {
        String rootDir = "E:\\文檔\\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; // 用來保存每行讀取的內容
        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();
        } // 讀取第一行
        while (line != null) { // 若是 line 爲空說明讀完了
            buffer.append(line); // 將讀到的內容添加到 buffer 中
            buffer.append("\r\n"); // 添加換行符
            try {
                line = reader.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            } // 讀取下一行
        }
        // 一、清除單行的註釋，如： //某某，正則爲 ：\/\/.*
        // 二、清除單行的註釋，如：/** 某某 */，正則爲：\/\*\*.*\*\/
        // 三、清除單行的註釋，如：/* 某某 */，正則爲：\/\*.*\*\/
        // 四、清除多行的註釋，如:
        // /* 某某1
        // 某某2
        // */
        // 正則爲：.*/\*(.*)\*/.*
        // 五、清除多行的註釋，如：
        // /** 某某1
        // 某某2
        // */
        // 正則爲：/\*\*(\s*\*\s*.*\s*?)*
        String filecontent = buffer.toString();

        Map<String, String> patterns = new HashMap<String, String>();
        patterns.put("([^:])\\/\\/.*", "$1");// 匹配在非冒號後面的註釋，此時就不到再遇到http://
        patterns.put("\\s+\\/\\/.*", "");// 匹配「//」前是空白符的註釋
        patterns.put("^\\/\\/.*", "");
        patterns.put("^\\/\\*\\*.*\\*\\/$", "");
        patterns.put("\\/\\*.*\\*\\/", "");
        patterns.put("/\\*(\\s*\\*\\s*.*\\s*?)*\\*\\/", "");
        //patterns.put("/\\*(\\s*\\*?\\s*.*\\s*?)*", "");
        Iterator<String> keys = patterns.keySet().iterator();
        String key, value;
        while (keys.hasNext()) {
            // 通過屢次替換
            key = keys.next();
            value = patterns.get(key);
            filecontent = replaceAll(filecontent, key, value);
        }
        // 再輸出到原文件
        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   內容
     * @param patternString 匹配的正則表達式
     * @param replace       替換的內容
     */
    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;
    }
}