package test;

import java.io.BufferedReader;  
import java.io.BufferedWriter;  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.InputStreamReader;  
import java.io.OutputStream;  
import java.io.OutputStreamWriter;  
 
public class CopyJava {  
 
   public static void main(String[] args) throws IOException {  
        copy("E:/project/aa/src", "E:/project/aa/desc"); // 这里写好源文件夹和目的文件夹  
    }  

   private static void copy(String srcPath, String descPath) throws IOException {  
        copy(new File(srcPath), new File(descPath));  
    }  

    private static void copy(File srcFile, File descFile) throws IOException {  
        if (srcFile.isFile()) { // 文件  
           File parent = descFile.getParentFile();  
            if (!parent.exists()) {  
                parent.mkdirs(); // 创建文件夹  
           }  
          if (srcFile.getName().endsWith(".java")) {  
               copyJava(srcFile, descFile);  
            } else {  
                copyFile(srcFile, descFile);  
            }  
        } else { // 文件夹  
           for (File file : srcFile.listFiles()) {  
               // 相对路径  
                String srcPath = file.getAbsolutePath().substring(srcFile.getAbsolutePath().length());  
               copy(file, new File(descFile.getAbsolutePath() + srcPath));  
            }  
        }  
   }  
 
    private static void copyJava(File srcFile, File descFile) throws IOException {  
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(descFile)));  
       BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(srcFile)));  
        String line;  
        while ((line = br.readLine()) != null) {  
            bw.write(line.replaceFirst(".*/\\*(.*)\\*/ ", "")); // 注意这里，如果不行，要适当修改  
            bw.write("\n");  
        }  
        br.close();  
       bw.close();  
    }  
 
    private static void copyFile(File srcFile, File descFile) throws IOException {  
       OutputStream output = new FileOutputStream(descFile);  
       InputStream input = new FileInputStream(srcFile);  
        byte[] buffer = new byte[1024 * 4];  
       int n = 0;  
       while ((n = input.read(buffer)) != -1) {  
           output.write(buffer, 0, n);  
      }  
       input.close();  
       output.close();  
   }  
 
}