这是源代码
服务器
package Supermarket;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class Server extends Thread{
public static void main(String[] args) {
ServerSocket socket = null;
Socket s =null;
InputStream is = null;
ObjectInputStream ois =null;
OutputStream os = null;
ObjectOutputStream oos = null;
Goods goods = new Goods();
try {
//创建客户端
//接受
while(true){
socket = new ServerSocket(8000);
s=socket.accept();
is=s.getInputStream();
ois= new ObjectInputStream(is);
//获取客户端的请求
Datas datas=(Datas)ois.readObject();
String role=goods.denglu(datas.getUserName(), datas.getPassWord());
datas.setRole(role);
oos= new ObjectOutputStream(s.getOutputStream());
oos.writeObject(datas);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
}
}
}

这是客户端
package Supermarket;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;
public class Sockets {
public static void main(String[] args) {
System.out.println("****欢迎光临****");
System.out.println("1.登陆");
System.out.println("2.退出系统");
Scanner input = new Scanner (System.in);
String p = input.next();
User user = new User();
if(p.equals("1")){
System.out.println("请输入账号");
String name = input.next();
System.out.println("请输入密码");
String pwd = input.next();
user.setUserName(name);
user.setUserPwd(pwd);
Socket socket =null;
OutputStream os =null;
ObjectOutputStream oos = null;
ObjectInputStream ois = null;
try {
//创建客户端
socket= new Socket("localhost",8000);
//像服务器发送
os= socket.getOutputStream();
oos = new ObjectOutputStream(os);
oos.writeObject(user);
ois = new ObjectInputStream(socket.getInputStream());
Datas datas=(Datas)ois.readObject();
if(datas.getRole()==null){
System.out.println("帐户名或密码错误");
}else{
System.out.println("登陆成功");
}
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
if(ois!=null)
ois.close();
if(oos!=null)
oos.close();
if(socket!=null)
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}else{
System.out.println("退出成功");
}
}
}

相关对象
package Supermarket;
import java.io.Serializable;
public class User implements Serializable{
private String userName;
private String userPwd;
private String role;
public User() {
super();
// TODO Auto-generated constructor stub
}
public User(String userName, String userPwd, String role) {
super();
this.userName = userName;
this.userPwd = userPwd;
this.role = role;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPwd() {
return userPwd;
}
public void setUserPwd(String userPwd) {
this.userPwd = userPwd;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
}

public class Datas implements Serializable {
private String flag;// 传递的标识
private String role;//用户用色
private String userName;//用户名
private String passWord;//密码
private Datasdatas;//商品对象
private List<Manage>manList; //商品对象
public String getFlag() {
return flag;
}
public void setFlag(String flag) {
this.flag = flag;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
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 Datas getDatas() {
return datas;
}
public void setDatas(Datas datas) {
this.datas = datas;
}
public List<Manage> getManList() {
return manList;
}
public void setManList(List<Manage> manList) {
this.manList = manList;
}
}

谢谢