paperdaofromfile.java

关于网上考试系统的

package com.tarena.exam.dao;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Properties;

import com.tarena.exam.model.Paper;
import com.tarena.exam.model.Question;
import com.tarena.exam.util.QuestionReader;

public class PaperDaoFromFile implements PaperDao{
	private Properties pro;
	
	public PaperDaoFromFile(){
		pro=new Properties();
		try {
			pro.load(new FileInputStream("subject.cfg"));
		}  catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public Paper getPaper(String subject) {
		File file=new File(pro.getProperty(subject));
		FileInputStream fis=null;
		BufferedReader br=null;
		Paper p=new Paper(subject);
		try {
			fis=new FileInputStream(file);
			br=new BufferedReader(new InputStreamReader(fis));
			QuestionReader qr=new QuestionReader(br);
			Question q=null;
			while((q=qr.readQuestion())!=null){
				p.addQuestion(q);
			}
			return p;
		} catch (IOException e) {
			e.printStackTrace();
		}finally{
			//????
		}
		return null;
	}
	
	public static void main(String[] args){
		PaperDao dao=new PaperDaoFromFile();
		Paper p=dao.getPaper("corejava");
		System.out.println(p);
	}

}