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用socket在客户端与服务器建立连接，用ServerSocket在服务器端接受客户端的连接请求。

客户端：package iheima;import java.io.BufferedReader;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.InputStreamReader;import java.net.Socket;public class Client {  public static void main(String[] args) {  // TODO Auto-generated method stub  try{   //连接到本地机，端口号   //如果连接到远程主机，则将IP设置为远程主机的IP即可   Socket  connectServer = new Socket("localhost",5500);   //将数据写入到socket上   DataOutputStream  outtoServer = new DataOutputStream(connectServer.getOutputStream());   DataInputStream  inFromServer = new DataInputStream(connectServer.getInputStream());   System.out.println("Login ... ...");   String  name,pswd;   boolean  goon = true;   String  strinServer;   BufferedReader  buf = new BufferedReader(new InputStreamReader(System.in));   System.out.print("\tname : ");  //读数据   name = buf.readLine();   System.out.print("\tpassword : ");   pswd = buf.readLine();   outtoServer.writeUTF(name+"-"+pswd);  //写到socket中   outtoServer.flush();   //清空缓冲区，立即发送   while(goon){    strinServer = inFromServer.readUTF();    if(!strinServer.endsWith("ok"))     System.out.println(strinServer);    else  goon = false;   }      inFromServer.close();   outtoServer.close();   connectServer.close();     }catch(Exception  e){   e.printStackTrace();  }catch(NoClassDefFoundError  e2){   e2.printStackTrace();  } }}

服务器端： package iheima;import java.io.DataInputStream;import java.io.DataOutputStream;import java.net.ServerSocket;import java.net.Socket;public class Server {  public static void main(String[] args) {  // TODO Auto-generated method stub  try{   System.out.println("等待连接... ...");   //创建服务器套接字，端口号为5500必须与客户端一致   ServerSocket serverSocket = new ServerSocket(5500);   //真挺来自客户端连接的请求   Socket  connectToClient = serverSocket.accept();   System.out.println("侦听请求来自"+connectToClient.getInetAddress().getHostAddress());   DataInputStream  inFromClient = new DataInputStream(connectToClient.getInputStream());   DataOutputStream  outtoClient = new DataOutputStream(connectToClient.getOutputStream());   String  name="liwei",pswd="123456";   String  message,str;   String  confirm[];      str = inFromClient.readUTF();   confirm = str.split("-");   if(confirm[0].equals(name) && confirm[1].equals(pswd)){    message = "登录成功";    System.out.println("data  have  sent");   }   else{    message = "验证失败";    System.out.println("sorry ... ...");   }   //message.concat("ok");   outtoClient.writeUTF(message);      outtoClient.flush();      inFromClient.close();      outtoClient.close();      connectToClient.close();  }catch(NoClassDefFoundError  e){   e.printStackTrace();  }catch(Exception  e){   e.printStackTrace();  } }}

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