如何实现Java中通用的文件复制方法？

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javapublic static void copyFile(File fromFile, File toFile) throws IOException { FileInputStream ins=new FileInputStream(fromFile); FileOutputStream out=new FileOutputStream(toFile); byte[] b=new byte[1024]; int n=0; while ((n=ins.read(b)) !=-1) { out.write(b, 0, n); } ins.close(); out.close();}

public static void copyFile(File fromFile,File toFile) throws IOException{ FileInputStream ins = new FileInputStream(fromFile); FileOutputStream out = new FileOutputStream(toFile); byte[] b = new byte[1024]; int n=0; while((n=ins.read(b))!=-1){ out.write(b, 0, b.length); } ins.close(); out.close(); }