字节流:InputStream:读文件、OutputStream:写文件_java outputstream 写入虚拟文件,inputstream读取

InputStream:读文件、OutputStream:写文件

package Java10;

import java.io.*;
import java.nio.charset.StandardCharsets;

//字节流:输入流(FileInputStream):读,输出流(FileOutputStream):写
public class InputOutputStream {
    public static void main(String[] args) throws Exception {
        //FileInputStream:读文件
        InputStream is = null;
        try {
            is = new FileInputStream("D:/java/test1/src/a.txt");
            byte[] b = is.readAllBytes();
            String s = new String(b);
            System.out.println(s);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        //FileOutputStream:写文件
        OutputStream o = new FileOutputStream("D:/java/test1/src/a.txt");
        byte[] b1 = "hello,晓晓".getBytes(StandardCharsets.UTF_8);
        o.write(b1);
        o.close();
    }
}
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