说到网络，相信大家都对TCP、UDP和HTTP协议这些都不是很陌生，学习这部分应该先对端口、Ip地址这些基础知识有一定了解，后面我们都是直接上demo来解释代码
文件传输
Tcp方式
这里我们指的是C/S架构的文件传输，需要涉及一个客户端Client和服务器端（Server)，这里采用的是TCP协议进行传输的，TCP需要经过三次握手和四次挥手，需要注意的是Client上传文件我们需要告诉服务器，我已经传输完成了socket.shutdownOutput()。
服务器
import java.io.*;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
public class TestServerUpload {
public static void main(String[] args) throws Exception {
ServerSocket serverSocket = new ServerSocket(9999);
Socket socket = serverSocket.accept();
// 或去输入
InputStream is = socket.getInputStream();
FileOutputStream outputStream = new FileOutputStream(new File("receive.jpg"));
byte[] buffer = new byte[1024];
int len;
while ((len = is.read(buffer)) != -1) {
outputStream.write(buffer, 0, len);
}
OutputStream outputStream1 = socket.getOutputStream();
outputStream1.write("我接收完毕了".getBytes());
is.close();
outputStream.close();
serverSocket.close();
serverSocket.close();
outputStream1.close();
}
}
客户端
import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
public class TestClientUpload {
public static void main(String[] args) throws Exception {
Socket socket = new Socket(InetAddress.getByName("127.0.0.1"), 9999);
// 创建输出流
OutputStream outputStream = socket.getOutputStream();
FileInputStream fileInputStream = new FileInputStream(new File("1.jpg"));
byte[] buffer = new byte[1024];
int len;
while (((len = fileInputStream.read(buffer))) != -1) {
outputStream.write(buffer, 0, len);
}
// 通知服务器我已经结束了
socket.shutdownOutput();
InputStream inputStream = socket.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer2 = new byte[1024];
int len2;
while ((len2 = inputStream.read(buffer2)) != -1) {
baos.write(buffer2, 0, len2);
}
System.out.println(baos.toString());
socket.close();
fileInputStream.close();
outputStream.close();
inputStream.close();
baos.close();
}
}Udp 方式
UDP是一种只管发送，不需要确保你已经接收的通信协议，就比如短信，我只管发送给您，但是不管有没有接收到。
public class UdpClient {
public static void main(String[] args) throws Exception {
// 1. 建包
DatagramSocket socket = null;
try {
socket = new DatagramSocket();
} catch (SocketException e) {
e.printStackTrace();
}
// 2. 建个包
String msg = "早安呀，大勇";
InetAddress localhost = InetAddress.getByName("localhost");
int port = 9999;
DatagramPacket datagramPacket = new DatagramPacket(msg.getBytes(), 0, msg.getBytes().length, localhost, port);
// 3. 发送包
socket.send(datagramPacket);
socket.close();
}
}public class UdpServer {
public static void main(String[] args) throws Exception{
// 开发端口
DatagramSocket socket = new DatagramSocket(9999);
// 收包
byte[] buffer = new byte[1024];
DatagramPacket datagramPacket = new DatagramPacket(buffer, 0, buffer.length);
// 阻塞接收
socket.receive(datagramPacket);
System.out.println(new String(datagramPacket.getData(), 0, datagramPacket.getLength()));
System.out.println(datagramPacket.getAddress().getHostAddress());
socket.close();
}
}简易聊天室的实现
接收端
public class TalkReceive implements Runnable {
DatagramSocket socket;
private int port;
private String msgFrom;
public TalkReceive(int port, String msgFrom) {
this.msgFrom = msgFrom;
this.port = port;
try {
socket = new DatagramSocket(port);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void run() {
while (true) {
try {
byte[] buffer = new byte[1024];
DatagramPacket datagramPacket = new DatagramPacket(buffer, 0, buffer.length);
socket.receive(datagramPacket);
if (datagramPacket.getLength() > 0) {
byte[] data = datagramPacket.getData();
String receiveDatas = new String(data, 0, data.length);
System.out.println("接收到了"+ msgFrom + receiveDatas);
if ("bye".equals(receiveDatas)) {
break;
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
socket.close();
}
}发送端
public class TalkSend implements Runnable {
DatagramSocket socket = null;
private int fromPort;
private String toIp;
private int toPort;
BufferedReader reader = null;
public TalkSend(int fromPort, String toIp, int port) {
this.fromPort = fromPort;
this.toIp = toIp;
this.toPort = port;
try {
socket = new DatagramSocket(fromPort);
reader = new BufferedReader(new InputStreamReader(System.in));
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void run() {
while (true) {
try {
String data = reader.readLine();
byte[] datas = data.getBytes();
DatagramPacket packet = new DatagramPacket(datas, 0, data.length(), new InetSocketAddress(this.toIp, toPort));
socket.send(packet);
if ("bye".equals(data)) {
break;
}
} catch (Exception e) {
e.printStackTrace();
}
// 数据
}
socket.close();
}
}启动
public class TalkStudent {
public static void main(String[] args) {
new Thread(new TalkSend(7777, "localhost", 9999)).start();
new Thread(new TalkReceive(8888, "老师")).start();
}
}public class TalkTeacher {
public static void main(String[] args) {
new Thread(new TalkSend(5555, "localhost", 8888)).start();
new Thread(new TalkReceive(9999, "学生")).start();
}
}
到此这篇关于Java实现一个简易聊天室流程的文章就介绍到这了,更多相关Java聊天室内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
