studentdaoimpbyweb.java

这是个可以进行多项选择的系统

/**
 * 
 */
package exam.dao;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;

import exam.model.Student;

/**
 * @author 董晓炜
 *
 * Feb 13, 2009 12:03:59 PM
 */
public class StudentDaoImpByWeb implements StudentDao {
	//从服务器端得到与对话框相匹配的学生对象的数据，如果没有，返回NULL
	
	private Socket s;
	
	public StudentDaoImpByWeb(Socket s){
		this.s=s;
	}

	public Student getStudent(String id, String passwd) {
		PrintWriter pw=null;
		BufferedReader br=null;
		Student  sd=null;
		try {
			pw = new PrintWriter(new OutputStreamWriter(s.getOutputStream(),"UTF-8"));
			pw.println("student:"+id+":"+passwd);
			pw.flush();
			br=new BufferedReader(new InputStreamReader(s.getInputStream(),"UTF-8"));
			String str=br.readLine();
			if(str.equals("again")){
				pw.println("student:"+id+":"+passwd);
				pw.flush();
				str=br.readLine();
			}
			if(str.equals("isStop"))return new Student("1002","hehe","1002");
			if(str.equals("")) return null;
			if(str.equals("cf"))return new Student("1001","董晓炜","1001");
			String[] ss=str.split(":");
			if(ss.length<3)return null;
			sd=new Student(ss[0],ss[1],ss[2]);
		} catch (IOException e) {
			if(s!=null){
				try {
					s.close();
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
			}
		}
		return sd;
		
	}
	
}