2.编写IoDemo.java的Java应用程序，程序完成的功能是：首先读取text.txt文件内容，再通过键盘输入文件的名称为iodemo.txt,把text.txt的内容存入iodemo.txt

package zuoye;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

public class IoDemo {

public static void main(String[] args) {
	File file = new File("d:/zuoye");
	if(!file.exists())
	{
		file.mkdirs();
	}
	File f=new File("d:/zuoye/text.txt");
	try {
		FileOutputStream out=new FileOutputStream(f);
		String nr="galkjg oz a2raty2re6at56a51gva54ad";
		byte[] b=nr.getBytes();
		out.write(b);
		out.close();
		//读取text.txt内容,边读编写
		FileInputStream in=new FileInputStream("d:/zuoye/text.txt");
		byte[]b1=new byte[1024];
		int i=-1;
		FileOutputStream out1=new FileOutputStream("d:/zuoye/iodemo.txt");
		while((i=in.read(b1))>0)
		{
			out1.write(b1, 0, i);
		}

		out1.close();
		in.close();

	} catch (Exception e) {
		// TODO 自动生成的 catch 块
		e.printStackTrace();
	}

}

}