video173 IO_標準步驟—拓展：copy 資料夾及資料夾下內容到目標資料夾下

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.OutputStream;

/**
 * copy 該資料夾及資料夾下內容到目標資料夾下
 * @author lei.ai
 *
 */
 

public class IOCopy03extend {

	public static void main(String[] args) throws IOException {
		copytodir("D:\\code\\Pro10\\test","D:\\code\\Pro10\\copytest");
		
	}
		
	
	private static void copytodir(String sourcepath,String destpath) throws IOException {
		// TODO Auto-generated method stub
		File sorce =
 
 new File(sourcepath);	//原始檔
		File dest = new File(destpath);
		//建立目標資料夾
		dest.mkdirs();		//如果目標資料夾已存在，則建立失敗
		
		//將原始檔名與目標路徑相結合，存到buffd中
		File buffd = new File(dest.getAbsolutePath(),sorce.getName());
				
		if (sorce!=null && sorce.exists()) {
			
			if (sorce.isFile()) {	//如果是檔案，在目標目錄中建立該檔案，並將內容複製
 

				buffd.createNewFile();
				copyfile(sorce.getAbsolutePath(), buffd.getAbsolutePath());
			}else {		//如果是資料夾，則遞迴呼叫
				for(File s:sorce.listFiles()) {
					File buffs = new File(sorce.getAbsolutePath(),s.getName());		
					copytodir(buffs.getAbsolutePath(),buffd.getAbsolutePath());
				}
			}
		}
	}
	
	
	
	
	
	
	
	private static void copyfile(String sourcepath,String destpath) {
		//1.建立源
		File sorce = new File(sourcepath);	//原始檔
		File dest = new File(destpath);		//目標檔案
		//2.選擇流
		InputStream is = null;
		OutputStream os = null;
		
		try {
			is = new FileInputStream(sorce);
			os = new FileOutputStream(dest);
			//3.操作
			//分段讀取
			byte[] flush = new byte[1024];
			int len;	//定義解碼接收長度
			while ((len=is.read(flush))!=-1) {
				
				os.write(flush, 0, len);
				/*
				String st = new String(flush, 0, len);	//編碼
				byte[] temp = st.getBytes();			//解碼
				os.write(temp, 0, temp.length);			//寫入
				*/
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {	//4、釋放資源 分別關閉 先開啟的後關閉
			if (os!=null) {
				try {
					os.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			
			if(is!=null) {
				try {
					is.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
			
		}

	}

}