输入输出流

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Scanner;

public class Test1 {

    public static void main(String[] args) {
        File file = new File("D:\\sun.txt");     //创建文件   
        //字节写入
        FileOutputStream outputStream = null;
        try {
            outputStream = new FileOutputStream(file);
            Scanner scanner = new Scanner(System.in); //接收键盘输入数据
            if(scanner.hasNextLine()) {  //
                String string = scanner.nextLine();
                outputStream.write(string.getBytes()); //写入
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        finally {
            if(outputStream!=null) {
                try {
                    outputStream.close();
                } catch (Exception e2) {
                    e2.printStackTrace();
                }
            }
        }
        
        //字节输出
        FileInputStream inputStream = null;
        try {
            inputStream = new FileInputStream(file);
            int tem = 0;
            while((tem=inputStream.read())!=-1) {
                System.out.print((char)tem);  //输出
            }
            
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if(inputStream!=null) {
                try {
                    inputStream.close();
                } catch (Exception e2) {
                    e2.printStackTrace();
                }
            }
        }

    }

}