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();
}

}
}