网络编程
获取ip
InetAddress id = InetAddress.getLocalHost(); // InetAddress id = InetAddress.getByName("www.baidu.com");
System.out.println(id); // DESKTOP-S2V8PJF/192.168.0.35
System.out.println(id.getHostName()); // DESKTOP-S2V8PJF
System.out.println(id.getHostAddress()); // 192.168.0.35
UDP程序示例
发送端
public class Send {
public static void main(String[] args) {
try {
byte[] sendData = "发送的数据".getBytes();
InetAddress id = InetAddress.getByName("127.0.0.1");
DatagramPacket dp = new DatagramPacket(sendData, sendData.length, id, 9000);
DatagramSocket ds = null;
try {
ds = new DatagramSocket();
try {
ds.send(dp);
} catch (IOException e) {
e.printStackTrace();
}
} catch (SocketException e) {
e.printStackTrace();
} finally {
ds.close();
}
} catch (UnknownHostException e) {
e.printStackTrace();
}
}
}
接收端
public class Receive {
public static void main(String[] args) {
DatagramSocket ds = null;
DatagramPacket dp = null;
byte[] receiveData = new byte[1024];
try {
ds = new DatagramSocket(9000);
dp = new DatagramPacket(receiveData, receiveData.length);
try {
ds.receive(dp);
System.out.println("由" + dp.getAddress().getHostAddress()+ ":" + dp.getPort() + "发送的数据->" + new String(receiveData, 0, dp.getLength()));
} catch (IOException e) {
e.printStackTrace();
}
} catch (SocketException e) {
e.printStackTrace();
}finally {
ds.close();
}
}
}
TCP程序
客户端
public class ClientSide {
public static void main(String[] args) {
Socket so;
OutputStream os;
try {
so = new Socket("127.0.0.1", 9000);
os = so.getOutputStream();
os.write("我是 客户端".getBytes()); // 给服务器发送数据
InputStream in = so.getInputStream();
byte[] data = new byte[1024];
int len = in.read(data);
System.out.println(new String(data, 0, len)); // 接受服务器数据
so.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
服务端
public class ServerSide {
public static void main(String[] args) {
ServerSocket ss;
Socket so;
OutputStream os;
try {
ss = new ServerSocket(9000);
so = ss.accept();
InputStream in = so.getInputStream();
byte[] data = new byte[1024];
int len = in.read(data);
System.out.println(new String(data, 0, len)); // 接受客户端数据
os = so.getOutputStream();
os.write("知道了".getBytes()); // 发送数据给客户端
os.close();
so.close();
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
结语
本文章是java成神的系列文章之一
如果你想知道，但是本文没有的，请下方留言
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