serverimpl.java

本程序适用java语言写的CORBA构架的网络服务器程序

import ex5.*;
import org.omg.CORBA.*;

import java.rmi.RemoteException;
import java.text.SimpleDateFormat;
import java.util.*;
public class ServerImpl extends ServicePOA{

	
private ORB orb;
private static Hashtable users = new Hashtable();

private static Vector<todolist> lists = new Vector<todolist>();
todolist l;
private int counter = 0;

private int deleted = 0;
/*构造函数*/
/**
 * 构造函数好像没有运行到这里,这个方法实现了ServicePOA接口
 */
	public void ServerImpl()
	{
		users = new Hashtable();
		lists = new Vector<todolist>();
	}
	//建立ORB
	public void setORB(ORB orb_val)
	{
		orb = orb_val;
	}
	//用户登陆
	public boolean login(String username, String password)
	 {

              if (!users.containsKey(username)) {
	                   return false;
                   }
               String p = (String)users.get(username);
               if (p.equals(password))
                    	return true;
              return false;
          }
//用户注册
        public boolean register(String username, String password)
	        {
                    if (users.containsValue(username))
                      	return false;
                    if (password == null)
                     	return false;

                   users.put(username, password);
                 return true;
            }
//添加一个Item
	public String addItems(String username, String password,String label ,String start, String end){
		try{
			
		if (!login(username, password))
			return null;
		Date s = new CORBAClient().changeDate(start);
		Date e = new CORBAClient().changeDate(end);
		counter++;		
		lists.add(new todolist(counter,username, password, label, 
				s, e));

		return "success";
		
	}catch (Exception e1){
		e1.printStackTrace(System.out);
		return null;}
		
	}
	//列出时间范围的item
	public String queryItems(String username, String password,String start, String end){
		
		if (!login(username, password))
			return null;
		String result = "";
		todolist list;
		String u ;
		String p;
		Date s;
		Date e;
		Vector<todolist> v = new Vector<todolist>();
		SimpleDateFormat bartDateFormat = new SimpleDateFormat("yyyy-MM-dd"); 
		
		for (Iterator it = lists.iterator(); it.hasNext();) {
			list = (todolist) it.next();
			u = list.getUsername();
			p = list.getUserPassword();
			if (u.equals(username) && p.equals(password)) {
				s = list.getStart();
				e = list.getEnd();
				if (!(s.after(new CORBAClient().changeDate(start)) 
						&& e.before(new CORBAClient().changeDate(end))))
					v.add(list);
					result +="Id: " + list.getId() 
						+"   label: "+list.getLabel()+"\r\n"
					+"From: "+bartDateFormat.format(list.getStart())+"\r\n"
					+"To: "+bartDateFormat.format(list.getEnd())+"\r\n";
			}			
		}
		return result;
		}

	//删除一个item
	public String deleteItems(String username, String password,int id){
		try{
		if (!login(username, password))
			return null;
		
		todolist l;
		int i;
		String u;
		String p;

		for (int j = 0; j < lists.size(); j++) {
			l = lists.get(j);
			i = l.getId();
			u = l.getUsername();
			p = l.getUserPassword();
			if (i == id && u.equals(username) && p.equals(password)) {
				lists.remove(j);
				j--;
				deleted++;
				return "success";
			}
		}
		return "failed";

		}catch (Exception e){}
		return null;
	}
	//清除所有的items
	public String clearItems(String username, String password){
		try{
		if (!login(username, password))
			return null;
		
		todolist l;
		String u;
		String p;

		for (int i = 0; i < lists.size(); i++) {
			l = lists.get(i);
			u = l.getUsername();
			p = l.getUserPassword();
			if (u.equals(username) && p.equals(password)) {
				lists.remove(i);
				i--;
				deleted++;
			}
		}
		return "success";		
		}catch (Exception e){}
		return "failed";
	}
	
	
	
	public void shutdown(){
		orb.shutdown(false);
	}


}