public static void main(String[] args) {
		removeComments("E:/Folder/test.java");//去除指定java文件的所有注释
	}

	/*
	 * 去除java文件中的任意注释 内容 包括单行注释、多行注释
         * 在java文件相同的路径创建去除结果文件
	 */
	public static void removeComments(String path) {
		try {
			File file = new File(path);
			File pFile = file.getParentFile();
			String[] fileInfo = file.getName().split("\\.");
			String fileName = fileInfo[0]; // 文件名
			String filter = fileInfo[1]; // 文件后缀
			String rpath = String.format("%s/%s-removeComments.%s", pFile.getAbsoluteFile(), fileName, filter);
			if (!file.exists())
				return;
			try (InputStreamReader iStreamReader = new InputStreamReader(new FileInputStream(file),
					Charset.defaultCharset());
					BufferedReader bf = new BufferedReader(iStreamReader);
					OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(new File(rpath)),
							Charset.forName("UTF-8"));
					PrintWriter pw = new PrintWriter(writer)) {
				String line = "";
				boolean isMultiMarkLine = false;
				while (line != null) {
					line = bf.readLine();
					if (line.equals(""))
						continue;
					if (isMultiMarkLine)// 上一行为多行注释的开头（/*）
					{
						if (line.matches(".*\\*.*"))// 匹配多行注释单独的*
							line = line.replaceAll(".*\\*.*", "");

					}
					if (line.matches(".*//.*"))// 匹配单行注释
					{
						line = line.replaceAll("//.*", "");
					}
					if (line.matches(".*/[\\*].*"))// 匹配多行注释的开头（/*）
					{
						isMultiMarkLine = true;
						line = line.replaceAll("/[\\*].*", "");
					} else
						isMultiMarkLine = false;
					if (line.matches(".*[\\*]/.*"))// 匹配当行注释以及多行注释的结尾符号（*/）
					{
						isMultiMarkLine = false;
						line = line.replaceAll(".*[\\*]/", "");
					}

					if (!line.equals("")) {
						System.out.println(line);
						pw.write(line+"\r\n");
					}

				}

			}
		} catch (Exception e) {
                        e.printStackTrace();
			// TODO: handle exception
		}

	}

import java.io.*;

public class BufferStream {
    public static void main(String[] args) {
        File file=new File("C:\\Users\\ASUS\\Desktop\\teet.java");
        File gfile=new File("C:\\Users\\ASUS\\Desktop\\gteet.java");
        try (FileWriter fileWriter=new FileWriter(gfile);FileReader fileReader=new FileReader(file)) {
            try (BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);BufferedReader bufferedReader=new BufferedReader(fileReader))
            {

                String str;
                while(((str=bufferedReader.readLine())!=null))
                {
                    if (!str.contains("//"))
                    {
                        bufferedWriter.write(str);
                        bufferedWriter.newLine();
                    }

                }
                bufferedWriter.flush();

            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

import java.io.*;
import java.util.ArrayList;
import java.util.List;

public class rmc {
    public static void main(String[] args) {
        File rjf = new File("D:\\IdeaProjects\\fzlj\\src\\pkgC\\raw.java");
        removeComments(rjf);

    }
    static void removeComments(File javaFile){
        try {
            FileReader fr = new FileReader(javaFile);
            BufferedReader br = new BufferedReader(fr);
            //创建个中间转换的列表集合
            List<String> lines = new ArrayList<>();
            while (true) {
                // 一次读一行
                String line = br.readLine();
                if (null != line) {
                    line = line.replaceAll("^\s+//.*", "");
                        if ("" != line){
                            lines.add(line);
                    }
                }
                else
                    break;
            }
            FileWriter fw = new FileWriter(javaFile);
            PrintWriter pw = new PrintWriter(fw);
            for (String l:lines){
              pw.println(l);
              pw.flush();
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

 public static void removeComments(File javaFile){
        StringBuffer sb=new StringBuffer();
        try(FileReader fr =new FileReader(javaFile);BufferedReader bf=new BufferedReader(fr);){

            while (true){

                String s=bf.readLine();
                if(s==null)
                    break;
                if(!s.trim().startsWith("//")){
                    sb.append(s).append("\r\n");
                }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try(FileWriter fw=new FileWriter(javaFile);PrintWriter pw =new PrintWriter(fw)){
            pw.write(sb.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

package h;


import java.io.*;
import java.io.File;

public class h{
    public static void remove(File f1,File f2){
        try (
                FileReader fr=new FileReader(f1);
                BufferedReader br=new BufferedReader(fr);
                FileWriter fw=new FileWriter(f2);
                PrintWriter pw=new PrintWriter(fw);

        ){
            while(true){
                String s=br.readLine();
                if(s==null){
                    break;
                }else if(s.startsWith("//")){
                    continue;
                }else if(s.contains("//")){
                    s=s.substring(0,s.indexOf("//"));
                }else {
                    s=s+"\n";     //为了显示起来排版好看，可省略
                    fw.write(s);
                }
                System.out.println(s);
            }


        }
        catch(IOException e){
            e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        File f1 = new File("e:/code/a.txt");
        File f2 = new File("e:/code/cc.txt");
        remove(f1,f2);
    }


}