package java1;
import java.net.InetAddress;
import java.net.UnknownHostException;
/**
*
* 1.IP：唯一标识Internet上的计算机
* 2.在java中使用InetAddress类代表IP
* 3.域名：www.baidu.com
* 4.如何实例化InetAddress:两个方法：getByName(String host)、getLocalHost()
* 两个常用方法：getHostName()、getHostAddress()
* 5.端口号：标识正在计算机上运行的进程。
* 6.端口号与ip地址的组合为网络套接字：socket
*
*
* @create 2022-04-13 21:45
*/
public class InetAddressTest {
public static void main(String[] args) throws UnknownHostException {
InetAddress inet1= InetAddress.getByName("192.168.1.1");
System.out.println(inet1);
InetAddress inet2=InetAddress.getByName("baidu.com");
System.out.println(inet2);
InetAddress inet3=InetAddress.getByName("127.0.0.1");
System.out.println(inet3);
//获取本地ip
InetAddress inet4=InetAddress.getLocalHost();
System.out.println(inet4);
System.out.println(inet2.getHostName());
System.out.println(inet2.getHostAddress());
}
}
package java1;
import org.junit.Test;
import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
/**
*
* 实现TCP的网络编程
* 例子1：客户端发送信息给服务端，服务端将数据显示在控制台上。
* @create 2022-04-13 22:52
*/
public class TCPTest1 {
//客户端
@Test
public void client() {
Socket socket= null;
OutputStream os= null;
try {
//1.创建socket对象，指明服务器端的ip和端口号
InetAddress inet=InetAddress.getByName("127.0.0.1");
socket = new Socket(inet,11111);
//2.获取一个输出流，用于输出数据
os = socket.getOutputStream();
//3.写出数据
os.write("你好，我是客户端GG".getBytes());
} catch (IOException e) {
e.printStackTrace();
} finally {
if(os!=null){
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(socket!=null){
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
//服务端
@Test
public void server() {
ServerSocket ss= null;
Socket socket= null;
InputStream is = null;
ByteArrayOutputStream baos= null;
try {
//1.创建服务器端的ServerSocket，指明自己的端口号
ss = new ServerSocket(11111);
//2.调用accept()接收来自于客户端的socket
socket = ss.accept();
//3.获取输入流
is = socket.getInputStream();
//4.读取输入流中的数据
baos = new ByteArrayOutputStream();
byte[] buffer=new byte[5];
int len;
while((len=is.read(buffer))!=-1){
baos.write(buffer,0,len);
}
System.out.println(baos.toString());
System.out.println("来源："+socket.getInetAddress().getHostAddress());
} 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(ss!=null){
try {
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
package java1;
import org.junit.Test;
import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
/**
*
*
* 客户端发送文件给服务端，服务端将文件保存在本地
* @create 2022-04-14 10:37
*/
public class TCPTest2 {
@Test
public void client() {
Socket socket = null;
OutputStream os = null;
FileInputStream fis = null;
try {
socket = new Socket(InetAddress.getByName("127.0.0.1"), 11111);
os = socket.getOutputStream();
fis = new FileInputStream(new File("4.png"));
byte[] buffer=new byte[1024];
int len;
while((len=fis.read(buffer))!=-1){
os.write(buffer,0,len);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if(fis!=null){
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(os!=null){
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(socket!=null){
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
@Test
public void server() {
ServerSocket ss = null;
Socket socket = null;
InputStream is = null;
FileOutputStream fos = null;
try {
ss = new ServerSocket(11111);
socket = ss.accept();
is = socket.getInputStream();
fos = new FileOutputStream(new File("5.png"));
byte[] buffer=new byte[1024];
int len;
while((len=is.read(buffer))!=-1){
fos.write(buffer,0,len);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if(fos!=null){
try {
fos.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(ss!=null){
try {
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
package java1;
import org.junit.Test;
import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
/**
*
* @create 2022-04-14 11:10
*/
public class TCPTest3 {
@Test
public void client() {
Socket socket = null;
OutputStream os = null;
FileInputStream fis = null;
InputStream is = null;
ByteArrayOutputStream baos = null;
try {
socket = new Socket(InetAddress.getByName("127.0.0.1"), 11111);
os = socket.getOutputStream();
fis = new FileInputStream(new File("5.png"));
byte[] buffer=new byte[1024];
int len;
while((len=fis.read(buffer))!=-1){
os.write(buffer,0,len);
}
socket.shutdownOutput();
//接收来自服务器端的数据
is = socket.getInputStream();
baos = new ByteArrayOutputStream();
byte[] buffer1=new byte[1024];
int len1;
while((len1=is.read(buffer1))!=-1){
baos.write(buffer1,0,len1);
}
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(fis!=null){
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(os!=null){
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(socket!=null){
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
@Test
public void server() {
ServerSocket ss = null;
Socket socket = null;
InputStream is = null;
FileOutputStream fos = null;
OutputStream os = null;
try {
ss = new ServerSocket(11111);
socket = ss.accept();
is = socket.getInputStream();
fos = new FileOutputStream(new File("6.png"));
byte[] buffer=new byte[1024];
int len;
while ((len=is.read(buffer))!=-1){
fos.write(buffer,0,len);
}
System.out.println("图片传输完成");
os = socket.getOutputStream();
os.write("已收到！".getBytes());
} catch (IOException e) {
e.printStackTrace();
} finally {
if(os!=null){
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(fos!=null){
try {
fos.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(ss!=null){
try {
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
package java1;
import com.sun.xml.internal.ws.api.message.Packet;
import org.junit.Test;
import java.io.IOException;
import java.net.*;
/**
*
*
* @create 2022-04-14 12:21
*/
public class UDPTest {
@Test
public void sender() throws IOException {
DatagramSocket socket = new DatagramSocket();
String str="你好！！！";
byte[] data=str.getBytes();
InetAddress inet = InetAddress.getLocalHost();
DatagramPacket packet = new DatagramPacket(data, 0, data.length,inet,11111);
socket.send(packet);
socket.close();
}
//接收端
@Test
public void receiver() throws IOException {
DatagramSocket socket = new DatagramSocket(11111);
byte[] buffer=new byte[1024];
DatagramPacket packet = new DatagramPacket(buffer, 0, buffer.length);
socket.receive(packet);
System.out.println(new String(packet.getData(),0,packet.getLength()));
socket.close();
}
}
package java1;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
/**
*
* @create 2022-04-14 12:59
*/
public class URLTest1 {
public static void main(String[] args) throws IOException {
URL url =new URL("http:/myweb/3.png");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.connect();
InputStream is = urlConnection.getInputStream();
FileOutputStream fos = new FileOutputStream("day10\\222.png");
byte[] buffer=new byte[1024];
int len;
while((len=is.read(buffer))!=-1){
fos.write(buffer,0,len);
}
System.out.println("下载完成");
if(fos!=null){
fos.close();
}
if(is!=null){
is.close();
}
if(urlConnection!=null){
urlConnection.disconnect();
}
}
}
