Java--输入输出流

 

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package pkg20221208fileiodemo;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author mikha
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        File file=new File("d://","HelloWorld.txt");
        try {
            file.createNewFile();//文件创建出来
            if(file.exists())//如果文件存在
            {
                //创建输出流
                FileOutputStream fOut=new FileOutputStream(file);
                byte[] bytes="面向对象课程设计".getBytes();
                fOut.write(bytes, 0, bytes.length);
                fOut.close();
                
                //输入流
                FileInputStream fIn=new FileInputStream(file);
                int end;
                bytes=new byte[128];
                while((end=fIn.read(bytes,0,bytes.length))!=-1)
                {
                    String str=new String(bytes);
                    System.out.println(str);
                }
                fIn.close();//输入流关闭
            }
        } catch (IOException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
        
                
    }
    
}