netexamsystem_server.java

java在线考试例子代码

package testovernet;

import java.io.*;
import java.net.*;

public class NetExamSystem_Server extends Thread {

    public static Socket servSocket;

    public void run() {
              ExamAdmin examAdmin = new ExamAdmin();

       try{
              InputStream servInput = servSocket.getInputStream();
              OutputStream servOutput = servSocket.getOutputStream();

              DataInputStream dataInput = new DataInputStream(servInput);
              DataOutputStream dataOutput = new DataOutputStream(servOutput);

              ObjectInputStream objInput = new ObjectInputStream(servInput);
              ObjectOutputStream objOutput = new ObjectOutputStream(
                      servOutput);

              Student stuFromClient = (Student) objInput.readObject();

              System.out.println("Student " + stuFromClient.name +
                                 " is connected. "
                                 + "\n" + "Authenticating...");

              //stuFromClient.printStudentInfo();

              boolean isStudent = examAdmin.isStudentInDatabase(stuFromClient.
                      testNum, stuFromClient.name);

              if (isStudent == true) {

                  dataOutput.writeUTF("\nAuthenticated!" +
                                        "\nYou are qulified to take a test!\n"
                                        +
                            "Please input what type of question you want"
                                        + " to answer and how many?");


                    dataOutput.writeUTF("Eligible");



                  dataOutput.writeUTF("Eligible");

                  String questionType = dataInput.readUTF();
                  System.out.println(questionType);
                  int questionAmount = dataInput.readInt();
                  System.out.println(questionAmount);

                  examAdmin.sendPaperToStudent(questionType, questionAmount,
                                               objOutput);

                  examAdmin.getTestPaperAfterExamFromStudent(questionAmount,
                          objInput);

                  examAdmin.caculatorStudentScore(questionAmount, dataOutput);

                  examAdmin.recordStudentScoreToDatabase();

              }
              else {

                  dataOutput.writeUTF(
                          "\nSorry,You are not qulified to take a test!\n"
                          + "Please make yourself qulified, Bye!!!");
                  dataOutput.writeUTF("NotEligible");
              }

              servInput.close();
              servOutput.close();
              servSocket.close();
          }
          catch (Exception e) {
              e.printStackTrace();
          }
      }



    public static void main(String[] args) {

        ServerSocket serverSocket = null;
       // ExamAdmin examAdmin = new ExamAdmin();

        try {
            serverSocket = new ServerSocket(9999);
        }
        catch (IOException e) {
            e.printStackTrace();
        }

        while (true) {

           try {
               servSocket = serverSocket.accept();

               Thread exam = new NetExamSystem_Server();

               exam.start();
           }catch(Exception e) {
               e.printStackTrace();
           }

        /*   try{
                InputStream servInput = servSocket.getInputStream();
                OutputStream servOutput = servSocket.getOutputStream();

                DataInputStream dataInput = new DataInputStream(servInput);
                DataOutputStream dataOutput = new DataOutputStream(servOutput);

                ObjectInputStream objInput = new ObjectInputStream(servInput);
                ObjectOutputStream objOutput = new ObjectOutputStream(
                        servOutput);

                Student stuFromClient = (Student) objInput.readObject();

                System.out.println("Student " + stuFromClient.name +
                                   " is connected. "
                                   + "\n" + "Authenticating...");

                //stuFromClient.printStudentInfo();

                boolean isStudent = examAdmin.isStudentInDatabase(stuFromClient.
                        testNum, stuFromClient.name);

                if (isStudent == true) {

                    dataOutput.writeUTF("\nAuthenticated!" +
                                        "\nYou are qulified to take a test!\n"
                                        +
                            "Please input what type of question you want"
                                        + " to answer and how many?");


                    dataOutput.writeUTF("Eligible");

                    String questionType = dataInput.readUTF();
                    int questionAmount = dataInput.readInt();

                    examAdmin.sendPaperToStudent(questionType, questionAmount,
                                                 objOutput);

                    examAdmin.getTestPaperAfterExamFromStudent(questionAmount,
                            objInput);

                    examAdmin.caculatorStudentScore(questionAmount, dataOutput);

                    examAdmin.recordStudentScoreToDatabase();

                }
                else {

                    dataOutput.writeUTF(
                            "\nSorry,You are not qulified to take a test!\n"
                            + "Please make yourself qulified, Bye!!!");
                    dataOutput.writeUTF("NotEligible");
                }

                servInput.close();
                servOutput.close();
                servSocket.close();
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }*/

    }
}
}