accessrandomfiledemo.java

来自「一些java高级源代码」· Java 代码 · 共 58 行

package adv.io;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.RandomAccessFile;

public class AccessRandomFileDemo {

	public static void main(String[] args) {

		RandomAccessFile raf;
		try {
			raf = new RandomAccessFile("Randomdemo.txt", "rw");
			raf.writeUTF("sun");
			raf.writeUTF("sun");

			raf.seek(0);

			raf.close();
		}
		catch (FileNotFoundException e1) {
			e1.printStackTrace();
		}
		catch (IOException e) {
			e.printStackTrace();
		}

		try {
			RandomAccessFile raf1 = new RandomAccessFile("Randomdemo.txt", "r");

			BufferedReader br1 = new BufferedReader(new InputStreamReader(
					System.in));
			System.out.println("请输入登录用户名：");
			String name = br1.readLine();
			System.out.println("请输入登录密码：");
			String pwd = br1.readLine();
			if (name.equalsIgnoreCase(raf1.readUTF())
					&& pwd.equals(raf1.readUTF())) {
				System.out.println("成功登录！");
			}
			else {
				System.out.println("信息不对");
			}
			raf1.close();
		}
		catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		catch (IOException e) {
			e.printStackTrace();
		}

	}

}