Java怎么实现文件拷贝

用FileInputStream、DataInputStream和FileOutputStream、DataOutputStream完成一个文件拷贝：将e:\test.jpg 拷贝到 e:\demo\test.jpg

答案：建议看一下apache FileUtils.copyFile的源码

public class CopyFile {
	public static void doCopyFile() throws IOException{
		File srcFile = new File("e:\\test.jpg");
		File destFile = new File("e:\\demo\\test.jpg");
		FileInputStream input = new FileInputStream(srcFile);
        try {
            FileOutputStream output = new FileOutputStream(destFile);
            try {
            	byte[] buffer = new byte[4096];
                int n = 0;
                while (-1 != (n = input.read(buffer))) {
                    output.write(buffer, 0, n);
                }
            } finally {
            	try {
                    if (output != null) {
                        output.close();
                    }
                } catch (IOException ioe) {
                    // ignore
                }
            }
        } finally {
        	try {
                if (input != null) {
                    input.close();
                }
            } catch (IOException ioe) {
                // ignore
            }
        }
	}

}

上一个：请问各位java高手：
下一个：java异常编程题