Java基础 网络编程练习

1、编程题 Homework01.java

Homework01Server.java Homework01Client.java

1、使用字符流的方式，编写一个客户端程序和服务器端程序

2、客户端发送"name",服务端接收到后，返回"我是nova",nova是你自己的名字

3、客户端发送"hobby",服务端接收到后，返回"编写java程序"

4、不是这两个问题，回复"你说啥呢"

import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;/*** @ClassName Homework01Client* @Description* @Author 小黄debug* @Date 2022/3/27 14:24* @Version 1.0**/
public class Homework01Client {public static void main(String[] args) throws IOException {//1、连接服务器（ip，端口）Socket socket = new Socket(InetAddress.getLocalHost(),9999);//2、连接上以后，生成socket//通过socket.getOutputStream()得到socket对象关联的输出流对象OutputStream outputStream = socket.getOutputStream();//3、通过输出流，写入数据到数据通道，使用字符流BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream));//bufferedWriter.write("hello server 字符流");//从键盘读取用户的问题Scanner scanner = new Scanner(System.in);System.out.println("请输入你的问题");String question = scanner.next();bufferedWriter.write(question);bufferedWriter.newLine();//插入一个换行符，表示写入的内容结束bufferedWriter.flush();//将数据推送InputStream inputStream = socket.getInputStream();//将inputStream转成字符流BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));String s= bufferedReader.readLine();System.out.println(s);//关闭bufferedReader.close();bufferedWriter.close();outputStream.close();socket.close();}
}

import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;/*** @ClassName Homework01Server* @Description* @Author 小黄debug* @Date 2022/3/27 14:14* @Version 1.0**/
public class Homework01Server {public static void main(String[] args) throws IOException {//监听本机的9999端口ServerSocket serverSocket = new ServerSocket(9999);//如果没有客户端连接，程序会阻塞，等待连接Socket socket = serverSocket.accept();//连接成功后socket有值了，拿到从客户端写入到数据通道的数据InputStream inputStream = socket.getInputStream();//将inputStream转成字符流BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));String s= bufferedReader.readLine();String answer = "";System.out.println(answer);if("name".equals(s)){answer = "我是小黄debug";}else if("hobby".equals(s)){answer = "编写java程序 ";}else{answer = "你说什么？";}//通过socket.getOutputStream()得到socket对象关联的输出流对象OutputStream outputStream = socket.getOutputStream();//3、通过输出流，写入数据到数据通道，使用字符流BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream));bufferedWriter.write(answer);bufferedWriter.newLine();//插入一个换行符，表示写入的内容结束bufferedWriter.flush();//将数据推送//关闭bufferedWriter.close();bufferedReader.close();outputStream.close();socket.close();}
}

2、编程题Homework02.java

Homework02ReceiverA.java        Homework02SenderB.java

1、编写一个接收端A，和一个发送端B，使用UDP协议完成

2、接收端在8888端口等待接收数据（receive)

3、发送端向接收端 发送数据"四大名著是哪些"

4、接收端收到发慈禧太后端发送的问题后，返回四大名著是<<红楼梦>>..,否则返回what?

5、接收端和发送端程序退出

import java.io.IOException;
import java.net.*;/*** @ClassName Homework02ReceiverA* @Description* @Author 小黄debug* @Date 2022/3/27 15:15* @Version 1.0**/
public class Homework02ReceiverA {public static void main(String[] args) throws IOException {//创建连接DatagramSocket socket = new DatagramSocket(9999);//byte[] buf = new byte[64*1024];DatagramPacket packet = new DatagramPacket(buf,buf.length);//接收数据socket.receive(packet);//拆包byte[] data = packet.getData();int length = packet.getLength();String s = new String(data,0,length);//将数据转成String;System.out.println(s);if("四大名著".equals(s)){s = "《红楼梦》。。";}else{s = "what ? ";}data = s.getBytes();//封装packet = new DatagramPacket(data,data.length, InetAddress.getByName("192.168.1.39"),9998);//发送socket.send(packet);socket.close();}
}

import java.io.IOException;
import java.net.*;/*** @ClassName Homework02ReceiverA* @Description* @Author 小黄debug* @Date 2022/3/27 15:15* @Version 1.0**/
public class Homework02ReceiverA {public static void main(String[] args) throws IOException {//创建连接DatagramSocket socket = new DatagramSocket(9999);//byte[] buf = new byte[64*1024];DatagramPacket packet = new DatagramPacket(buf,buf.length);//接收数据socket.receive(packet);//拆包byte[] data = packet.getData();int length = packet.getLength();String s = new String(data,0,length);//将数据转成String;System.out.println(s);if("四大名著".equals(s)){s = "《红楼梦》。。";}else{s = "what ? ";}data = s.getBytes();//封装packet = new DatagramPacket(data,data.length, InetAddress.getByName("192.168.1.39"),9998);//发送socket.send(packet);socket.close();}
}

3、Homework03.java

1、编写客户端程序 和服务器端程序

2、客户端可以输入一个音乐文件名，比如高山流水，服务端收到音乐名后，可以给客户端返回这个音乐文件，如果服务器没有这个文件，返回一个默认的音乐即可

3、客户端收到文件后，保存到本地 e:\\

4、提示：该程序 可以使用StreamUtils.java

import com.hsydebug.upload.StreamUtils;import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.util.Scanner;/*** @ClassName Homework04Client* @Description* @Author 小黄debug* @Date 2022/3/27 22:50* @Version 1.0**/
public class Homework03Client {public static void main(String[] args) throws IOException {//1、接收用户，指定下载文件名Scanner scanner = new Scanner(System.in);System.out.println("请输入下载文件名");String downLoadFileName = scanner.next();//2.客户端连接服务端，准备发送Socket socket = new Socket(InetAddress.getLocalHost(),9999);//3.获取和Socket关联的输出流OutputStream outputStream = socket.getOutputStream();outputStream.write(downLoadFileName.getBytes());//设置定稿结束标记socket.shutdownOutput();//4、读取服务端返回的文件（字节数据）BufferedInputStream bis = new BufferedInputStream(socket.getInputStream());byte[] bytes = StreamUtils.streamToByteArray(bis);//5、得到一个输出流，准备将bytes写入磁盘文件String filePath = "e:\\"+downLoadFileName+".mp3";BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(filePath));bufferedOutputStream.write(bytes);bis.close();bufferedOutputStream.close();outputStream.close();socket.close();}
}

import com.hsydebug.upload.StreamUtils;import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;/*** @ClassName Homework03Server* @Description* @Author 小黄debug* @Date 2022/3/27 19:56* @Version 1.0**/
public class Homework03Server {public static void main(String[] args) throws IOException {//1.监听9999端口ServerSocket serverSocket = new ServerSocket(9999);//2.等待客户端连接Socket socket = serverSocket.accept();//3.读取InputStream inputStream = socket.getInputStream();byte[] b = new byte[1024];int len = 0;String downLoadFileName = "";while((len = inputStream.read(b)) != -1){downLoadFileName += new String(b,0,len);}System.out.println("客户端希望下载的文件："+downLoadFileName);//String resFileName = "";if("高山流水".equals(downLoadFileName)){resFileName = "src\\高山流水.mp3";}else{resFileName = "src\\无名.mp3";}//创建一个输入流，读取文件BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(resFileName));//5、使用工具类StreamUtils,读取一个字节数组byte[] bytes = StreamUtils.streamToByteArray(bufferedInputStream);//6、得到socket关联的输出流BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(socket.getOutputStream());//7、写入到数据通道，返回客户端bufferedOutputStream.write(bytes);socket.shutdownOutput();bufferedInputStream.close();bufferedOutputStream.close();socket.close();serverSocket.close();}
}

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