001-SE-0008-IO复制

最新推荐文章于 2024-06-14 10:38:42 发布

原创最新推荐文章于 2024-06-14 10:38:42 发布 · 160 阅读

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本文详细介绍了几种文件复制的方法，包括使用字节流和字符流进行文件复制的技术，并提供了具体的Java代码实现，同时还介绍了一种复制多级文件夹的方法。

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字节流复制文件：

* 使用FileInputStream和FileOutputStream复制文件
	public class MyTest {
		public static void main(String[] args) throws Exception {
			FileInputStream fis = new FileInputStream("fis.txt");//里面的内容是abc
			FileOutputStream fos = new FileOutputStream("fos.txt");
			byte[] bys = new byte[1024];
			int len = 0;
			while((len = fis.read(bys))!=-1){
				fos.write(bys,0,len);
			}
			fis.close();
			fos.close();
		}
	}

* 使用BufferedInputStream和BufferedOutputStream复制文件
	public static void main(String[] args) throws Exception {
		BufferedInputStream bis = new BufferedInputStream(new FileInputStream("fis.txt"));
		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("fos.txt"));
		byte[] bys = new byte[1024];
		int len =0;
		while((len=bis.read(bys))!=-1){
			bos.write(bys,0,len);
		}
		bis.close();
		bos.close();
	}

字符流复制文件

* 使用字符输入流FileReader和FileWriter复制文件
	public static void main(String[] args) throws Exception {
		FileReader fr = new FileReader("fis.txt");
		FileWriter fw = new FileWriter("fos.txt");
		char[] chs=new char[1024];
		int len = 0;
		while((len=fr.read(chs))!=-1){
			fw.write(chs,0,len);
		}
		fr.close();
		fw.close();
	}

* 使用高效字符输入流BufferedReader和高效字符输出流BufferedWriter复制文件
	* 方式一：
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new FileReader("fis.txt"));
		BufferedWriter bw = new BufferedWriter(new FileWriter("fos.txt"));
		char[] chs = new char[1024];
		int len = 0;
		while((len = br.read(chs))!=-1){
			bw.write(chs,0,len);
			bw.flush();
		}
		br.close();
		bw.close();
	}

	* 方式二：
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new FileReader("fis.txt"));
		BufferedWriter bw = new BufferedWriter(new FileWriter("fos.txt"));
		String line= null;
		while((line = br.readLine())!=null){
			bw.write(line);
			bw.newLine();
			bw.flush();
		}
		br.close();
		bw.close();
	}

复制多级文件夹

package pack;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

/**
 * 复制文件夹D:\\src下所有的内容到文件夹D:\\dest下
 * @author fanshoujun
 *
 */
public class MyTest {
	public static void main(String[] args) throws Exception {
		File srcFolder = new File("D:\\src");
		File destFolder = new File("D:\\dest");
		copyFolder(srcFolder,destFolder);
	}
	
	public static void copyFolder(File srcFolder,File destFolder) throws Exception{
		File[] srcFolderFiles = srcFolder.listFiles();
		for (File src : srcFolderFiles) {
			String srcName = src.getName();
			File dest = new File(destFolder,srcName);
			if(src.isFile()){
				copyFile(src, dest);
			}else{
				dest.mkdir();
				copyFolder(src, dest);
			}
		}
	}
	
	public static void copyFile(File srcFile,File destFile) throws Exception{
		BufferedInputStream bis = new BufferedInputStream(new FileInputStream(srcFile));
		BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(destFile));
		byte[] bys= new byte[1024];
		int len = 0;
		while((len = bis.read(bys))!=-1){
			bos.write(bys,0,len);
		}
		bis.close();
		bos.close();
	}
}