這篇來聊聊網絡編程中的一些操作
1.IP以及端口
public class demo {
public static void main(String[] args) {
InetSocketAddress socketAddress = new InetSocketAddress("127.0.0.1", 8080);
InetSocketAddress socketAddress2 = new InetSocketAddress("localhost", 8089);
System.out.println(socketAddress);
System.out.println(socketAddress2);
System.out.println(socketAddress.getAddress());
System.out.println(socketAddress.getHostName());
System.out.println(socketAddress.getPort());
}
}
/127.0.0.1:8080
localhost/127.0.0.1:8089
/127.0.0.1
127.0.0.1
8080public class demo2 {
public static void main(String[] args) throws UnknownHostException {
/* InetAddress inetAddress = InetAddress.getByName("127.0.0.1");
System.out.println(inetAddress);*/
InetAddress inetAddress1 = InetAddress.getByName("localhost");
System.out.println(inetAddress1);
InetAddress inetAddress2 = InetAddress.getLocalHost();
String hostName = inetAddress1.getHostName();
System.out.println(hostName);
System.out.println(inetAddress2);
InetAddress inetAddress3 = InetAddress.getByName("www.baidu.com");
System.out.println(inetAddress3);
System.out.println(inetAddress3.getCanonicalHostName());
System.out.println(inetAddress3.getHostAddress());
System.out.println(inetAddress3.getHostName());
}
}
localhost/127.0.0.1
localhost
DESKTOP-Q9AHENK/192.168.1.176
www.baidu.com/14.215.177.38
14.215.177.38
14.215.177.38
www.baidu.com
2 .TCP實現聊天
用戶端
public class Clientdemo1 {
public static void main(String[] args) throws IOException {
Socket socket=null;
OutputStream os=null;
try {
InetAddress serverIP = InetAddress.getByName("127.0.0.1");
int port=9999;
socket = new Socket(serverIP, port);
os=socket.getOutputStream();
os.write("歡迎光臨".getBytes());
} catch (UnknownHostException e) {
e.printStackTrace();
}finally {
if(os!=null){
os.close();
}
}
}
}
服務端
public class Serverdemo1 {
public static void main(String[] args) {
ServerSocket serverSocket=null;
Socket socket=null;
InputStream is=null;
ByteArrayOutputStream baos=null;
try {
serverSocket= new ServerSocket(9999);
while(true){
socket=serverSocket.accept();
is=socket.getInputStream();
baos=new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while((len=is.read(buffer))!=-1){
baos.write(buffer,0,len);
}
System.out.println(baos.toString());
}
} catch (IOException e) {
e.printStackTrace();
}finally {
if(baos!=null){
try {
baos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(is!=null){
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(socket!=null){
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(serverSocket!=null){
try {
serverSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
3.URL實現下載網絡資源
public class Download {
public static void main(String[] args) throws IOException {
URL url = new URL("輸入地址");//輸入要下載的地址
HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
InputStream inputStream = urlConnection.getInputStream();
FileOutputStream fileOutputStream = new FileOutputStream("f.m4a");
byte[] buffer = new byte[1024];
int len;
while((len=inputStream.read())!=-1){
fileOutputStream.write(buffer);
}
fileOutputStream.close();
inputStream.close();
urlConnection.connect();
}
}
4.UDP多線程在線諮詢
public class TalkReceive implements Runnable {
DatagramSocket socket = null;
private int port;
private String msgFrom;
public TalkReceive(int port,String msgFrom) {
this.port = port;
this.msgFrom = msgFrom;
try {
socket = new DatagramSocket(port);
} catch (SocketException e) {
e.printStackTrace();
}
}
@Override
public void run() {
while (true){
try {
//準備接收包裹
byte[] container = new byte[1024];
DatagramPacket packet = new DatagramPacket(container,0,container.length);
socket.receive(packet); //阻塞式接收包裹
//斷開連接 bye
byte[] data = packet.getData();
String receiveData = new String(data, 0, data.length);
System.out.println(msgFrom +"："+receiveData);
if (receiveData.equals("bye")){
break;
}
} catch (IOException e) {
e.printStackTrace();
}
}
socket.close();
}
}
public class TalkSend implements Runnable {
DatagramSocket socket = null;
BufferedReader reader = null;
private int fromPort;
private String toIP;
private int toPort;
public TalkSend(int fromPort, String toIP, int toPort) {
this.fromPort = fromPort;
this.toIP = toIP;
this.toPort = toPort;
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,datas.length,new InetSocketAddress(this.toIP,this.toPort));
socket.send(packet);
if (data.equals("bye")){
break;
}
}catch (Exception e){
e.printStackTrace();
}
}
socket.close();
}
}
public class TalkStudent {
public static void main(String[] args) {
//開啓兩個線程
new Thread(new TalkSend(7777,"localhost",9999)).start();
new Thread(new TalkReceive(8888,"老師")).start();
}
}
public class TalkTeacher {
public static void main(String[] args) {
new Thread(new TalkSend(5555,"localhost",8888)).start();
new Thread(new TalkReceive(9999,"學生")).start();
}
}
public class UdpReceiveDemo1 {
public static void main(String[] args) throws Exception {
DatagramSocket socket = new DatagramSocket(6666);
while (true){
//準備接收包裹
byte[] container = new byte[1024];
DatagramPacket packet = new DatagramPacket(container,0,container.length);
socket.receive(packet); //阻塞式接收包裹
//斷開連接 bye
byte[] data = packet.getData();
String receiveData = new String(data, 0, data.length);
System.out.println(receiveData);
if (receiveData.equals("bye")){
break;
}
}
socket.close();
}
}
```java
public class UdpSenderDemo1 {
public static void main(String[] args) throws Exception {
DatagramSocket socket = new DatagramSocket(8888);
//準備數據： 控制檯讀取 System.in
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
while (true) {
String data = reader.readLine();
byte[] datas = data.getBytes();
DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress("localhost",6666));
socket.send(packet);
if (data.equals("bye")){
break;
}
}
socket.close();
}
}