1、数据流基本使用

package demo02;

import org.junit.Test;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @description: demo11
 * @author: liuyang
 * @create: 2021-09-07 9:31
 */
public class Demo11 {
    /**
     * 数据流：
     * 将字符串或者基本数据类型的数据写到文件中，
     * 再从文件中读取出来
     */
    @Test
    public void test1() {
        DataOutputStream dataOutputStream = null;
        DataInputStream dataInputStream = null;
        try {
            // 数据输出流
            dataOutputStream = new DataOutputStream(new FileOutputStream("data.txt"));
            // 数据输入流
            dataInputStream = new DataInputStream(new FileInputStream("data.txt"));
            // 写字符串
            dataOutputStream.writeUTF("刘阳");
            dataOutputStream.writeUTF("男");
            // 写整数
            dataOutputStream.writeInt(20);
            // 写布尔型
            dataOutputStream.writeBoolean(true);
            // 开始读取,必须按照写的顺序读取
            String name = dataInputStream.readUTF();
            String gender = dataInputStream.readUTF();
            int age = dataInputStream.readInt();
            boolean boo = dataInputStream.readBoolean();
            System.out.println("name---" + name);
            System.out.println("gender---" + gender);
            System.out.println("age---" + age);
            System.out.println("boo---" + boo);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (dataOutputStream != null) {
                    dataOutputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                if (dataInputStream != null) {
                    dataInputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}