输入输出2

Posted 2020-08-11 庚庚庚庚庚辰

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:/test.txt");
    if(!file.exists())
    {
        file.mkdirs();
    }
    File f=new File("d:/text.txt");
    try {
        FileOutputStream out=new FileOutputStream(f);
        String nr="aasdasasd";
        byte[] b=nr.getBytes();
        out.write(b);
        out.close();
        FileInputStream in=new FileInputStream("d:/text.txt");
        byte[]b1=new byte[1024];            
        int i=-1;           
        FileOutputStream out1=new FileOutputStream("d:/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();
    }
}
}