studentdaofromfile.java

关于网上考试系统的

package com.tarena.exam.dao;

import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.util.HashSet;

import com.tarena.exam.model.Student;

public class StudentDaoFromFile implements StudentDao{
	private String fileName;
	
	public StudentDaoFromFile(String fileName){
		this.fileName=fileName;
		//????
	}
	
	public Student getStudent(int id, String passwd) {
		FileInputStream fis=null;
		ObjectInputStream ois=null;
		HashSet<Student> hs=null;
		try {
			fis=new FileInputStream(fileName);
			ois=new ObjectInputStream(fis);
			hs=(HashSet<Student>)ois.readObject();
			for(Student s:hs){
				if(s.getId()==id && s.getPasswd().equals(passwd)){
					return s;
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

}