JAVA学习笔记(六十)- 网络编程登录实例

客户端

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

/*
* 客户端
*/
public class LoginClient {
public static void main(String[] args) {
try {
//1.创建客户端Socket，指定服务器地址和端口号,同时建立连接
Socket socket=new Socket("localhost", 8888);
//2.获取输出流，向服务器发送信息
OutputStream os=socket.getOutputStream();
//PrintWriter pw=new PrintWriter(os);//封装为打印流
ObjectOutputStream oos=new ObjectOutputStream(os);
User user=new User("admin", "123");
oos.writeObject(user);//序列化对象
socket.shutdownOutput();//关闭当前输出流
//3.获取输入流，并读取服务器端的响应信息
InputStream is=socket.getInputStream();
BufferedReader br=new BufferedReader(new InputStreamReader(is));
String reply=br.readLine();
while(reply!=null){
System.out.println("我是客户端，服务器说："+reply);
reply=br.readLine();
}
socket.shutdownInput();
//4.关闭资源
br.close();
is.close();
oos.close();
os.close();
socket.close();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}

标题

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

/*
* 服务器端
*/
public class LoginServer {
public static void main(String[] args) {
try {
ServerSocket serverSocket=new ServerSocket(8888);
System.out.println("******服务器即将启动，等待客户端的连接");
int count=0;//统计客户端数量
// 循环监听等待客户端的连接
while(true){
Socket socket=serverSocket.accept();
//创建一个新的线程
ServerThread thread=new ServerThread(socket);
thread.start();//启动线程

count++;
System.out.println("客户端数量："+count);
System.out.println("客户端IP："+socket.getInetAddress().getHostAddress());
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

服务器端线程处理类

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;

/*
* 服务器端线程处理类
*/
public class ServerThread extends Thread {
//与本线程相关的Socket
Socket socket=null;

public ServerThread(Socket socket){
this.socket=socket;
}

//线程执行的操作
@Override
public void run() {
InputStream is=null;
ObjectInputStream ois=null;
OutputStream os=null;
PrintWriter pw=null;
try {
is=socket.getInputStream();//字节流
ois=new ObjectInputStream(is);
User user=(User) ois.readObject();
System.out.println("用户名："+user.getUsername());
System.out.println("密码："+user.getPassword());
socket.shutdownInput();//关闭当前输入流
os=socket.getOutputStream();
pw=new PrintWriter(os);
pw.println("欢迎您！");
pw.flush();
socket.shutdownOutput();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally{
try {
if(pw!=null)
pw.close();
if(os!=null)
os.close();
if(ois!=null)
ois.close();
if(is!=null)
is.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

}

标题

import java.io.Serializable;

/*
* 实体类User
*/
public class User implements Serializable {

private static final long serialVersionUID = 6682618522883563864L;
private int id;
private String username;
private String password;

public User() {
super();
}

public User(String username, String password) {
super();
this.username = username;
this.password = password;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

public static long getSerialversionuid() {
return serialVersionUID;
}
}