我正在尝试将行人对象发送到服务器和服务器以返回消息对象中的汽车驱动程序列表。但是当我尝试发送服务器似乎卡在readObject函数上并且客户端无法初始化Object输出和输入流。 这是我的服务器代码：
package eece350;
import java.util.List;
import java.io.*;
import java.net.Socket;
import java.net.ServerSocket;
import java.sql.Array;
import java.util.ArrayList;
import java.util.Scanner;
import java.lang.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.sql.*;
/**
*
* @author user
*/
public class SkillsServer {
private ServerSocket serverSocket;
private void acceptConnections() {
try {
int port = 7171;
serverSocket = new ServerSocket(port);
}
catch (IOException e)
{
System.err.println("ServerSocket instantiation failure");
e.printStackTrace();
System.exit(0);
}
// Entering the infinite loop
while (true) {
try {
// wait for a TCP handshake initialization (arrival of a "SYN"
// packet)
Socket newConnection = serverSocket.accept();
System.out.println("accepted connection");
// Now, pass the connection socket created above to a thread and
// run it in it
// First create the thread and pass the connection socket to it
// This is a non-blocking function: constructor of the class
// ServerThread
ServerThread st = new ServerThread(newConnection);
// Then, start the thread, and go back to waiting for another
// TCP connection
// This also is not blocking
new Thread(st).start();
}
catch (IOException ioe)
{
System.err.println("server accept failed");
}
}
}
public static void main(String[] args) throws NullPointerException, ClassNotFoundException, FileNotFoundException, SQLException
{
SkillsServer server = null;
server= new SkillsServer();
// call this function, which will start it all...
server.acceptConnections();
}
// Internal class
class ServerThread implements Runnable
{
private Socket socket;
private ObjectOutputStream dataout;
private ObjectInputStream datain;
//private DataOutputStream outToClient;
ServerThread(Socket socket)
{
// Inside the constructor: store the passed object in the data
// member
this.socket = socket;
}
private List<CarDriver> getAllCarDriversWithCapacity() throws SQLException
{
String userName = "Mahdi";
String password = "admin";
String url ="jdbc:sqlserver://localhost:1433"+";databaseName=Project350;Integrated Security=True";
try
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
}
catch (ClassNotFoundException ex)
{
System.out.println("Cannot connect to database");
}
Connection conn = DriverManager.getConnection(url,userName,password);
// TODO code application logic here
Statement stmt = conn.createStatement();
String query= "select * from CarDriver";
ResultSet rs =stmt.executeQuery(query);
CarDriver Car = new CarDriver();
List<CarDriver> ListofDrivers = new ArrayList<>();
while(rs.next())
{
if(rs.getInt(12)>0)
{
Car.setDid(rs.getInt(0));
Car.setName(rs.getString(1));
Coordinates C = new Coordinates(rs.getDouble(2),rs.getDouble(3));
Car.setLocation(C);
C.setCoordinates(rs.getDouble(4),rs.getDouble(5));
Car.setDestination(C);
Car.setNumofPassengers(rs.getInt(6));
Car.setChargingPerKilometer(rs.getDouble(7));
Regulations r = new Regulations(rs.getString(8),rs.getString(9),rs.getString(10),rs.getString(11));
Car.setRegulations(r);
Car.setCarCapacity(rs.getInt(12));
ListofDrivers.add(Car);
}
}
rs.close();
conn.close();
return ListofDrivers;
}
private void InsertCarDriver(CarDriver cardriver) throws SQLException
{
String name=cardriver.getName();
Coordinates Location=cardriver.getLocation();
int did=cardriver.getDid();
Coordinates Destination=cardriver.getDestination();
int numberofPassengers=cardriver.getNumofPassengers();
int CarCapacity=cardriver.getCarCapacity();
Double charging=cardriver.getChargingPerKilometer();
Regulations regulations=cardriver.getRegulations();
String pets = regulations.pets;
String kids = regulations.kids;
String quietride = regulations.quietRide;
String smoking = regulations.smoking;
Double XLoc = Location.coordinateX;
Double YLoc = Location.coordinateY;
Double XDes = Destination.coordinateX;
Double YDes = Destination.coordinateY;
String userName = "Mahdi";
String password = "admin";
String url ="jdbc:sqlserver://localhost:1433"+";databaseName=Project350;Integrated Security=True";
try
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
}
catch (ClassNotFoundException ex)
{
System.out.println("Cannot connect to database");
}
Connection conn = DriverManager.getConnection(url,userName,password);
// TODO code application logic here
Statement stmt = conn.createStatement();
String query = "Insert into CarDriver values("+did+",'"+name+"',"+XLoc+","+YLoc+","+XDes+","+YDes+","+numberofPassengers+","+charging+",'"+smoking+"','"+pets+"','"+kids+"','"+quietride+"',"+CarCapacity+")";
stmt.execute(query);
conn.close();
}
public void run()
{
try
{
// Input and output streams, obtained from the member socket
// object
//outToClient = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()))
dataout = new ObjectOutputStream(new BufferedOutputStream(socket.getOutputStream()));
datain = new ObjectInputStream(new BufferedInputStream(socket.getInputStream()));
}
catch (IOException e)
{
System.out.println("Can't Initialize Streams");
}
String name="";
Coordinates location;
Coordinates Destination;
int numberofPassenger;
double chargingPerKilometer;
int carCapacity,did;
Regulations regulations;
boolean connectionActive = true;
String reply="";
while (connectionActive)
{
try
{
Object object;
object = datain.readObject();
if(object instanceof CarDriver)
{
/*String url ="jdbc:sqlserver://localhost:1433"+";databaseName=EECE350Project;Integrated Security=True";
String userName = "Mahdi";
String password = "admin";
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection conn = DriverManager.getConnection(url,userName,password);
Statement stmt = conn.createStatement();*/
CarDriver CarDriver1 = (CarDriver)object;
name=CarDriver1.getName();
location=CarDriver1.getLocation();
Destination=CarDriver1.getDestination();
numberofPassenger=CarDriver1.getNumofPassengers();
chargingPerKilometer=CarDriver1.getChargingPerKilometer();
carCapacity = CarDriver1.getCarCapacity();
regulations = CarDriver1.getRegulations();
did=CarDriver1.getDid();
reply = "I recieved your connection "+name;
this.InsertCarDriver(CarDriver1);
//outToClient.write(reply.getBytes(),0,reply.length());
//outToClient.write("\n".getBytes(),0,1);
//outToClient.flush();
try
{
System.out.println("Closing Socket");
datain.close();
//outToClient.close();
dataout.close();
socket.close();
}
catch(IOException ioe)
{
System.out.println("Unable to Close Socket");
}
}
else
{
System.out.println("Hello");
Regulations Pedregulations;
int pid=0;
Coordinates Pedlocation;
Coordinates PedDestination;
Pedestrian Pedestrian1 = (Pedestrian)object;
pid = Pedestrian1.pid;
Pedlocation = Pedestrian1.currentLocation;
PedDestination = Pedestrian1.Destination;
List <CarDriver> ListofCars = this.getAllCarDriversWithCapacity();
String mes = "";
Message message = new Message();
message.setMessage(ListofCars, mes);
reply= "I recieved your connection"+pid;
System.out.println(pid);
dataout.writeObject(message);
dataout.flush();
//outToClient.write(reply.getBytes(),0,reply.length());
//outToClient.write("\n".getBytes(),0,1);
//outToClient.flush();
//outToClient.writeBytes(reply);
try
{
System.out.println("Closing Socket");
datain.close();
//outToClient.close();
dataout.close();
socket.close();
}
catch(IOException ioe)
{
System.out.println("Unable to Close Socket");
}
}
}
catch (IOException ex)
{
System.out.println("No Object Recieved");
}
catch (ClassNotFoundException ex)
{
System.out.println("Class");
}
catch (SQLException ex)
{
Logger.getLogger(SkillsServer.class.getName()).log(Level.SEVERE, null, ex);
}
//catch (SQLException ex)
//{
//return;
//}
}
try
{
System.out.println("closing socket");
datain.close();
dataout.close();
socket.close();
}
catch (IOException e)
{
System.out.print('.');
}
}
}
}
这是我的客户代码：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package eece350;
import java.io.Serializable;
import java.io.*;
import java.net.*;
import java.util.ArrayList;
import java.util.List;
/**
*
* @author user
*/
// double hey = Double.parseDouble(string);
public class Pedestrian implements Serializable
{
public int pid=0;
public Coordinates currentLocation;
public Coordinates Destination;
public Regulations preferences;
public Pedestrian()
{
this.pid=0;
this.Destination=null;
this.currentLocation=null;
this.preferences=null;
}
public Pedestrian(Coordinates currentLocation,Coordinates Destination,int pid,Regulations preferences) throws IOException, ClassNotFoundException
{
this.pid=pid;
this.Destination=Destination;
this.currentLocation=currentLocation;
this.preferences=preferences;
Socket clientSocket = new Socket("localhost", 7171);
ObjectOutputStream outToServer = new ObjectOutputStream(clientSocket.getOutputStream());
ObjectInputStream inFromServer = new ObjectInputStream(clientSocket.getInputStream());
//BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
//String modifiedSentence="";
System.out.println("heyo");
outToServer.writeObject(this);
Object object;
object = inFromServer.readObject();
if(object instanceof Message)
{
Message m = (Message)object;
if(m.CarDrivers!=null)
{
for(int i =0;i<m.CarDrivers.size();i++)
{
System.out.print(m.CarDrivers.get(i).getName());
}
}
}
else
{
System.out.print("Not a message");
}
//modifiedSentence = inFromServer.readLine();
//System.out.println("FROM SERVER: " + modifiedSentence);
outToServer.close();
inFromServer.close();
outToServer.flush();
clientSocket.close();
}
public static void main(String argv[]) throws Exception
{
}
}
请有人帮我吗？