Exercise 5 of SSD 8 -- JAVA

一个基于CORBA远程调用方法的日程管理系统。100 points!!!
经过Ex4和Exam 2的洗礼之后，远程调用似乎变得模式化了，因此现在只需要熟悉一下CORBA中orb, poa, obj里类似的API以及IDL建模语言就可以了，
其中要额外注意的是：1.本试验需要两个远程调用类，其中Creator仅有一个，用来集中管理用户注册信息，另一个则有多个对象，用来执行每个用户的操作；2.IDL不支持"高级类"传递，所以我的做法是把"高级类"在Servant端就转化成String，再传给Client。

英文题目如下：
<h3>Background</h3> <BR /> <p>Build a distributed to-do list using Java and CORBA. Various clients should be <BR /> able to connect to a server managing various to-do list objects to query list items, <BR /> add list items, delete list items, and clear to-do lists. The server should also <BR /> have management functionality that allows member registration. Each to-do list item <BR /> has a description, and a start time and an end time in which users must complete <BR /> their items. Users should be able to add any number of items to their to-do lists.</p> <BR /> <h3>Tasks</h3> <BR /> <p>For this programming exercise, we will be using JavaSoft&#39;s Java IDL, which is <BR /> a CORBA ORB written completely in Java. The advantages of Java&#39;s IDL are that it <BR /> is free and very portable. Its disadvantage is that its functionality is minimal. <BR /> However, it supports static method invocations, and it has a naming service, which <BR /> is all we need for this programming exercise. The Java IDL compiler (<code>idlj</code>) <BR /> is packaged with the <BR /> <a target="external" href="http://java.sun.com/j2se/1.4.2/download.html">latest <BR /> version of Java</a> (1.4.2 as of the time of this writing). You may find documentation <BR /> for the <code>idlj</code> compiler <BR /> <a target="external" href="http://java.sun.com/j2se/1.4.2/docs/guide/rmi-iiop/toJavaPortableUG.html"> <BR /> here</a>. </p> <BR /> <p>Your to-do list should implement the following functionality. Each piece of functionality <BR /> outlined below must be accessible from the client using the CORBA naming service. <BR /> Each user&#39;s to-do list must be a separate object that is managed using CORBA. <BR /> </p> <BR /> <dl> <BR />   <dt><b>User Registration</b> </dt> <BR />   <dd>New users may register. New users must supply a user name and a password. <BR />   If the supplied user name is already in use by some other user, print an error <BR />   message. Upon successful registration, print a message stating so. A new user <BR />   registration should create a new to-do list object for the user. </dd> <BR />   <dt><b>Adding Items</b> </dt> <BR />   <dd>Registered users may add items to their to-do list. Each item has a start <BR />   time and an end time. Parameters should include the start and end times, and <BR />   a label. The user should receive a message indicating a successful addition <BR />   or an error if one occurs. </dd> <BR />   <dt><b>Querying Items</b> </dt> <BR />   <dd>Registered users may look up all items in their to-do list in a given interval <BR />   of time. The parameters should include the start and end times of the search <BR />   interval. Return a list of the entries found in the specified time range. In <BR />   the list, include the start time, end time, and label of each item. </dd> <BR />   <dt><b>Deleting Items</b> </dt> <BR />   <dd>Registered users may delete items from their to-do list. The parameters <BR />   should uniquely identify the entry to be deleted. </dd> <BR />   <dt><b>Clearing Items</b> </dt> <BR />   <dd>Registered users may clear all items from their to-do list. </dd> <BR /> </dl> <BR /> <h3>Interface</h3> <BR /> <p>Your client must be accessible via a simple console-based menu.</p> <BR /> <h3>Implementation</h3> <BR /> <p>To complete this assignment, you will need to manage multiple CORBA objects using <BR /> the CORBA naming service. For each user that successfully registers, you must create <BR /> a new to-do list and add it to the CORBA naming service. To that end, you will need <BR /> to write a to-do list creator that creates to-do lists and adds them to the CORBA <BR /> naming system. The to-do list creator must be also be accessible using the CORBA <BR /> naming service. Therefore, if there are <var>n</var> to-do list system users, CORBA <BR /> must manage <var>n+1</var> CORBA objects — one to-do list object for each user <BR /> <em>plus</em> the creator object. You will need to perform the following tasks to <BR /> complete this assignment.</p> <BR /> <ul> <BR />   <li>Write a to-do list creator object that creates to-do lists upon a successful <BR />   user registration and adds the to-do list objects to the CORBA naming service. <BR />   </li> <BR />   <li>Casting the to-do list object to a generic Java object and generating the <BR />   IDL description of the interfaces. </li> <BR />   <li>Write a simple CORBA client that exercises the main methods of the to-do <BR />   list and to-do list creator CORBA object. </li> <BR />   <li>Deploying and running the system. You should run a test involving two or <BR />   more agenda objects, keeping track of the agendas of different users. The client <BR />   should use the CORBA naming service to find the appropriate agenda object.</li> <BR /> </ul>
[Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]

代码如下：
两个IDL文件
Creator.idl - 用户注册IDL
相关文件：点这儿打开
List.idl - 日程管理IDL
相关文件：点这儿打开
5个JAVA文件
CorbaItem.java - 日程信息类
相关文件：点这儿打开
CorbaCreator.java - 用户注册实现类
相关文件：点这儿打开
CorbaList.java - 日程管理实现类
相关文件：点这儿打开
CorbaServant.java - 服务器类
相关文件：点这儿打开
CorbaClient.java - 客户端类
相关文件：点这儿打开

README文件如下：
批处理：
idlj -fall Creator.idl
idlj -fall List.idl
javac *.java
javac CreatorFile/*.java
javac ListFile/*.java

运行方法：
start tnameserv
java CorbaServant –ORBInitialPort 900
java CorbaClient