socketutil.java

关于网上考试系统的

package com.tarena.exam.util;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.Properties;

public class SocketUtil {
	private static Socket s;
	private static ObjectInputStream ois;//确保输入输出流是一个对象 
	private static ObjectOutputStream oos;
	
	public static Socket createSocket(){
		Properties pro=new Properties();
		try {
			pro.load(new FileInputStream("client.cfg"));
			String serverIP=pro.getProperty("ServerIP");
			int serverPort=Integer.parseInt(pro.getProperty("ServerPort"));
			s=new Socket(serverIP,serverPort);
			return s;
		} catch (Exception e) {
			e.printStackTrace();
		} 
		return null;
	}
	
	public static void closeSocket(){
		try {
			s.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	public static ObjectInputStream getInputStream(){
		try {
			if(ois==null){
			ois=	new ObjectInputStream(s.getInputStream());
			}
			
		} catch (IOException e) {
			e.printStackTrace();
		}
		return ois;
	}
	
	public static ObjectOutputStream getOutputStream(){
		try {
			if(oos==null)
				oos= new ObjectOutputStream(s.getOutputStream());
		} catch (IOException e) {
			e.printStackTrace();
		}
		return oos;
	}

}