IO流_数据输入输出流的概述和讲解

偏执的太偏执、 2022-07-10 12:00 215阅读 0赞

package cn.itcast_01;
    
    import java.io.DataInputStream;
    import java.io.DataOutputStream;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    /*
     * 可以读写基本数据类型的数据
     * 数据输入流:DataInputStream
     * 		DataInputStream(InputStream in)
     * 数据输出流:DataOutputStream
     * 		DataOutputStream(OutputStream out) 
     */
    public class DataStreamDemo {
    	public static void main(String[] args) throws IOException {
    		// 写
    		// write();
    		// 读
    		read();
    
    	}
    
    	public static void read() throws IOException {
    		// DataInputStream(InputStream in)
    		// 创建数据输入流对象
    		DataInputStream dis = new DataInputStream(
    				new FileInputStream("dos.txt"));
    
    		// 读取数据
    		byte b = dis.readByte();
    		short s = dis.readShort();
    		int i = dis.readInt();
    		long l = dis.readLong();
    
    		float f = dis.readFloat();
    		double d = dis.readDouble();
    		boolean bb = dis.readBoolean();
    		char c = dis.readChar();
    
    		// 释放资源
    		dis.close();
    
    		System.out.println(b);
    		System.out.println(s);
    		System.out.println(i);
    		System.out.println(l);
    		System.out.println(f);
    		System.out.println(d);
    		System.out.println(bb);
    		System.out.println(c);
    	}
    
    	public static void write() throws IOException {
    		// DataOutputStream(OutputStream out)
    		// 创建数据输出流对象
    		DataOutputStream dos = new DataOutputStream(new FileOutputStream(
    				"dos.txt"));
    
    		// 写数据了
    		dos.writeByte(10);
    		dos.writeShort(100);
    		dos.writeInt(1000);
    		dos.writeLong(10000);
    
    		dos.writeFloat(12.5F);
    		dos.writeDouble(15.23);
    		dos.writeBoolean(true);
    		dos.writeChar('a');
    
    		// 释放资源
    		dos.close();
    	}
    }