實現步驟:
服務器端:
1、創建ServerSocket對象,綁定監聽端口
2、通過accept()方法監聽客戶端請求(循環監聽)
3、server與socket建立專線連接,兩個socket在一個單獨的線程上對話、通過輸入流讀取客戶端發送的請求信息
4、通過輸出流向客戶端發送響應信息
5、server繼續等待新的連接
6、關閉相應資源
客戶端:
1、創建Socket對象,指明需要連接的服務器的地址和端口號
2、連接建立後,通過輸出流向服務器端發送請求信息
3、通過輸入流獲取服務器響應的信息
4、關閉相應的資源
Server
package com.socket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import javax.swing.text.AbstractDocument.BranchElement;
/*
* 基於TCP協議的Socket通信,實現用戶登錄
* 服務器端
*/
public class Server {
public static void main(String[] args) {
try {
//1.創建一個服務器端的Socket,即ServerSocket,指定綁定的端口,並監聽此端口
ServerSocket serverSocket=new ServerSocket(8888);
//2.調用accept方法開始監聽,等待客戶端的連接
Socket socket=null;
int count=0;
System.out.println("***服務器即將啓動,等待客戶端的連接***");
while(true) {
socket=serverSocket.accept();
ServerThread serverThread = new ServerThread(socket);
serverThread.start();
//統計客戶端的數量
count++;
System.out.println("客戶端的數量爲:"+count);
InetAddress address = socket.getInetAddress();
System.out.println("客戶端的ip爲:"+address.getHostAddress());
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
Client
package com.socket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
/*
* 客戶端
*/
public class Client {
public static void main(String[] args) {
try {
//1.創建客戶端socket,指定服務器地址和端口
Socket socket=new Socket("localhost", 8888);
//2.獲取輸出流,向服務器端發送消息
OutputStream os=socket.getOutputStream(); //字節輸出流
PrintWriter pw=new PrintWriter(os); //將字節流包裝成打印流
pw.write("用戶名:xiaolu;密碼:233");
pw.flush(); //刷新緩存
socket.shutdownOutput();
//3.獲取輸入流,並讀取服務器端的響應信息
InputStream is=socket.getInputStream();
BufferedReader br=new BufferedReader(new InputStreamReader(is));
String info=null;
while((info=br.readLine())!=null) {
System.out.println("我是客戶端,服務器說:"+info);
}
br.close();
is.close();
pw.close();
os.close();
socket.close();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
ServerThread
package com.socket;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
/*
* 服務器線程處理類
*/
public class ServerThread extends Thread{
//和本線程相關的Socket
Socket socket = null;
public ServerThread(Socket socket) {
this.socket=socket;
}
//線程執行操作,響應客戶端請求
public void run() {
InputStream is = null;
InputStreamReader isr = null;
BufferedReader br = null;
OutputStream os = null;
PrintWriter pw = null;
try {
//3. 獲取輸入流,並讀取客戶端信息
is = socket.getInputStream();
isr = new InputStreamReader(is);
br = new BufferedReader(isr);
String info=null;
while((info=br.readLine())!=null) {
System.out.println("我是服務器,客戶端說:"+info);
}
socket.shutdownInput();//關閉輸入流
os = socket.getOutputStream();
pw = new PrintWriter(os);
pw.write("歡迎你!");
pw.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
try {
if(pw!=null)
pw.close();
if(os!=null)
os.close();
//關閉資源
if(br!=null)
br.close();
if(isr!=null)
isr.close();
if(is!=null)
is.close();
if(socket!=null)
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}