复制java代码并除去空行和注释

一时失言乱红尘 2024-04-18 07:53 55阅读 0赞

import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.util.ArrayList;
    import java.util.List;
    
    public class Readjavafile {
    	/*获取当前项目根路径
    	 * */
    	public static  final String rootpath = System.getProperty("user.dir");
    	
    	public static List<String> getfilepath(){
    		List<String> li=new ArrayList<String>();
            File[] list = new File(rootpath).listFiles();
            for(File file : list)
            {
               if(file.isFile())
               {
                   if (file.getName().endsWith(".java")) {
                       // 就输出该文件的绝对路径
                	   String st=file.getAbsolutePath();
                       System.out.println(st);
                       li.add(st);
                   }
    
               }
            }
        
    		return li;
    	}
    	
    	public static void inputtxt() throws IOException{
    		String fileName = rootpath+"\\java.txt";
    		File f=new File(fileName);
    		OutputStream out = new FileOutputStream(f,true);//true表示是在文件后面追加内容，而不是覆盖。默认的是覆盖
    		List<String> li=getfilepath();
    		for(String st :li){
    			File file = new File(st);
    			Long fileLength = file.length();
    			byte[] fileContext = new byte[fileLength.intValue()];
    			FileInputStream in = new FileInputStream(st);
    			in.read(fileContext);
    			String str = new String(fileContext);
    			str = str.replaceAll("\\/\\*[\\w\\W]*?\\*\\/|\\/\\/.*", "");/* "\\/\\*[\\s\\S]*\\*\\/|\\/\\/.*"   两个都能除去注释*/
    			str = str.replaceAll("\r\n	*\r\n", "\r\n");
    			str = str.replaceAll("\r\n *\r\n", "\r\n");
    			str = str.replaceAll("\r\n\r\n", "\r\n");
    			str=str+"\r\n";
    			byte[] bs = str.getBytes();
    			for(int i = 0 ; i < bs.length ; i++){
    				out.write(bs[i]);
    			}
    		}
    		out.close();
    	}
    	
        public  static void main(String[] args) throws IOException{
        	inputtxt();
        	System.out.println("完成！");
        }    
    }