Java基础回顾 : 文件夹的拷贝

本文是一个范例 : 文件夹的拷贝

package example;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * 文件夹的拷贝.
 */

public class TestDemo {
	public static void main(String[] args) {
		String srcPath = "E:\\test";
		String destPath = "E:\\my";
		try {
			copyDirectory(srcPath, destPath);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 文件夹拷贝方法的重载
	 * @param srcPath
	 * @param destPath
	 * @throws Exception
	 */
	public static void copyDirectory(String srcPath,String destPath) throws Exception{
		File src = new File(srcPath);
		File dest = new File(destPath);
		if(src.isDirectory()) {
			dest = new File(destPath,src.getName());
			dest.mkdirs();
		}
		copyDirectory(src,dest);
	}
	
	/**
	 * 用递归实现文件夹的拷贝
	 * @param srcFile
	 * @param destFile
	 * @throws Exception
	 */
	public static void copyDirectory(File srcFile,File destFile) throws Exception{
		if(srcFile.isFile()){
			File dest = new File(destFile,srcFile.getName());
			copyFile(srcFile, dest);
		}
		if(srcFile.isDirectory()){
			for(File f : srcFile.listFiles()) {
				if(f.isFile()) {
					File dest = new File(destFile,f.getName());
					copyFile(f, dest);
				}
				if(f.isDirectory()) {
					File dest = new File(destFile,f.getName());
					dest.mkdirs();
					copyDirectory(f,dest);
				}
			}
		}
	}
	
	/**
	 * 拷贝文件
	 * @param src : 拷贝的源文件File对象
	 * @param dest : 拷贝的目标文件File对象
	 * @throws Exception
	 */
	public static void copyFile(File src, File dest) throws Exception {
		if(!src.isFile()){
			throw new IOException("只有文件才能拷贝.");
		}
		if(!dest.getParentFile().exists()){
			dest.getParentFile().mkdirs();
		}
		if (src.exists()) {
			InputStream input = new FileInputStream(src);
			OutputStream output = new FileOutputStream(dest);
			int len = 0;
			byte data[] = new byte[1024];
			while ((len = input.read(data)) != -1) {
				output.write(data, 0, len);
			}
			output.close();
			input.close();
		}
	}

	/**
	 * 拷贝文件
	 * @param srcPath : 拷贝的源文件路径
	 * @param destPath : 拷贝的目标文件路径
	 * @throws Exception
	 */
	public static void copyFile(String srcPath, String destPath)
			throws Exception {
		copyFile(new File(srcPath), new File(destPath));
	}
}