server.java

c/s客户端服务器的在线考试系统内含源码和试题

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

public class Server {
	public static void main(String args[]) {
		ServerSocket server = null;
		Socket sok = null;
		while (true) {
			try {
				server = new ServerSocket(5000);
			} catch (IOException e1) {
				System.out.println("正在监听");
			}
			try {// 获得客户端IP
				sok = server.accept();
				InetAddress address = sok.getInetAddress();
				System.out.println("客户端的IP:" + address);

			} catch (IOException e) {
			}
			if (sok != null) {
				new Server_thread(sok).start();
			} else {
				continue;
			}
		}
	}
}

class FileName implements FilenameFilter // 实现过滤器对试题格式过滤取出试题
{
	String str = null;

	FileName(String s) {
		str = "." + s;
	}

	public boolean accept(File dir, String name) {
		return name.endsWith(str);
	}
}

class Server_thread extends Thread {
	int i = 0;
	Socket socket = null;
	File file = null;
	DataOutputStream out = null;
	DataInputStream in = null;
	ReadTestquestion rtq = null;
	boolean firsttimeclick = true;

	Server_thread(Socket t) {
		socket = t;
		try {

			in = new DataInputStream(socket.getInputStream()); // 由Socket对象得到输入流
			out = new DataOutputStream(socket.getOutputStream()); // 由Socket对象得到输出流
		} catch (IOException e) {
		}
		rtq = new ReadTestquestion();
	}

	public void run() {

		while (true) {
			String s = null;
			try {
				s = in.readUTF(); // 从输入流中读取操作的字节
				if (s.startsWith("将试题文件添加到下拉列表中")) // 如果匹配到list_test_file就列出考试文件
				{
					File f1 = new File("");
					File dir = new File(f1.getAbsolutePath(), ""); // 当前目录
					// String 当前目录=System.getProperty("user.dir");
					// File dir=new File(当前目录); //当前目录
					FileName fileTxt = new FileName("txt"); // 在当前目录下过滤出所有txt文件
					String fileName[] = dir.list(fileTxt); // 列出带过滤器的文件名清单
					for (int i = 0; i < fileName.length; i++) {
						out.writeUTF("试题文件@" + fileName[i]);
					}
					out.writeUTF("传送完毕@");
					System.out.println("试题文件传送完毕");
				} else if (s.startsWith("选择试题:")) {
					String fileName = s.substring(s.indexOf(":") + 1);
					System.out.println("客户端选择了试题"+fileName);
					rtq.setFilename(fileName);
					rtq.setTestOver(false);
					firsttimeclick = true;
				} else if (s.startsWith("读取下一题")) {
					String contentTest = rtq.getTestContent();
					if(contentTest.startsWith("endend")){
						out.writeUTF("考试结束:");
					}else{
					out.writeUTF("文件内容:" + contentTest);
					System.out.println("客户端读取下一题了");
					if (firsttimeclick == true) // 继续答题显示倒计时
					{
						long time = rtq.getTime();
						out.writeUTF("考试时间:" + time);
						System.out.println("考试时间:" + time);
						firsttimeclick = false;
					}
					if (rtq.getTestOver()) // 答题完毕
					{
						out.writeUTF("考试结束:");
					}
					}
				} else if (s.startsWith("提交该题答案:")) // 提交答案
				{
					String answer = s.substring(s.indexOf(":") + 1);
					System.out.println("客户端提交了答案"+answer);
					rtq.setSelection(answer);
				} else if (s.startsWith("查看成绩")) // 显示分数
				{
					int score = rtq.getScore();
					String messages = rtq.getMessages();
					out.writeUTF("你的成绩是:" + score + "\n" + messages);
					System.out.println("客户端查看成绩了");
				}
			} catch (IOException e1) {
				try {
					socket.close();
				} catch (Exception e2) {
				}
				break;
			}
		}
	}
}

class ReadTestquestion {
	String filename = "", // 存储文件名字
			correctAnswer = "", // 存储正确答案
			testContent = "", // 试题内容
			selection = ""; // 存储选择的答案
	int score = 0; // 得分
	long time = 0; // 答题时间
	boolean testOver = false; // 考试完毕
	File f = null;
	FileReader in = null;
	BufferedReader br = null;

	public void setFilename(String name) // 接受传到的文件名做相应处理
	{
		filename = name;
		score = 0;
		selection = "";
		try {
			if (in != null && br != null) {
				in.close();
				br.close();
			}
			f = new File(filename);
			in = new FileReader(f);
			br = new BufferedReader(in);
			correctAnswer = (br.readLine()).trim();
			//String time = (br.readLine()).trim();
			//String time = line2.substring(line2.indexOf(":") + 1);
			String temp = (br.readLine()).trim();
			StringTokenizer token = new StringTokenizer(temp, ":"); // 设置标记以：分隔时间格式
			int hour = Integer.parseInt(token.nextToken()); // 设置小时
			int minute = Integer.parseInt(token.nextToken()); // 设置分钟
			int second = Integer.parseInt(token.nextToken()); // 设置秒
			time = 1000 * (second + minute * 60 + hour * 60 * 60);

		} catch (Exception e) {
			testContent = "没有选择试题";
		}
	}

	public String getFilename() // 得到文件名
	{
		return filename;
	}

	public long getTime() // 获取倒计时时间
	{
		return time;
	}

	public void setTestOver(boolean b) // 完成考试
	{
		testOver = b;
	}

	public boolean getTestOver() // 完成考试
	{
		return testOver;
	}

	public String getTestContent() // 获取试题内容
	{
		try {
			String s = null;
			StringBuffer temp = new StringBuffer();
			if (br != null) {
				while ((s = br.readLine()) != null) {
					if (s.startsWith("**")) // 匹配到**就break
						break;
					temp.append("\n" + s);
					if (s.startsWith("endend")) // 出现endend就关闭流
					{
						in.close();
						br.close();
						testOver = true;
					}
				}
				testContent = new String(temp);
			} else {
				testContent = new String("没有选择试题");
			}
		} catch (Exception e) {
			testContent = "试题内容为空,考试结束！！";
		}
		return testContent;
	}

	public void setSelection(String s) {
		selection = selection + s;
	}

	public int getScore() // 计算分数
	{
		score = 0;
		int length1 = selection.length();
		int length2 = correctAnswer.length();
		int min = Math.min(length1, length2);
		for (int i = 0; i < min; i++) {
			try {
				if (selection.charAt(i) == correctAnswer.charAt(i)) // 如果匹配到了相同的就执行++
					score++;
			} catch (StringIndexOutOfBoundsException e) {
				i = 0;
			}
		}
		return score;
	}

	public String getMessages() // 得到最终的答题信息
	{
		int length1 = selection.length();
		int length2 = correctAnswer.length();
		int length = Math.min(length1, length2);
		String message = "正确答案:" + correctAnswer.substring(0, length) + "\n"
				+ "你的回答:" + selection + "\n";
		return message;
	}

}