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You can also use the command-line Slide WebDAV client Our portlet only allows content browsing and viewing, although we could certainly add more file management support We are using several open source libraries for our WebDAV portlet The first is the WebDAV client library we discussed previously That library is packaged in the jakarta-slide-webdavlib-20jar file It also requires the Jakarta Commons HTTP client library and the Jakarta Commons logging libraries The correct versions are in the Slide client binary distribution The other libraries we will use are the JSP Standard Tag libraries, for our JSP files We use the Jakarta Commons Standard Tag Library, version 104 (the same as 5) We will need the jstljar and the standardjar files All of these libraries should go in your WEB-INF/lib directory.

Our portlet will display the available resources for a collection, or it will display the contents of a noncollection resource If you select a collection, the portlet will update its internal pointer to a WebDAV resource, and then display the resources in the collection If you select a file, the portlet will retrieve its contents as a string, and then display them in the portlet window You may also navigate back up the hierarchy with the parent folder link at the bottom of the page We created one portlet class, CMSPortletjava It responds to action requests and render requests The WebDAVHelper class encapsulates the WebDAV functionality WebDAVHelper is a bridge between the portlet and the client library, and it includes some utility methods Our JSP file, ListFilesjsp, uses the portlet and standard JSP tag libraries to display the resources for a collection..

112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 static class Program { // The user interface static void Main ( ) { // context.s are States // Decide on a starting state and hold onto the Context thus established Context context = new Context( ); context.State = new RestingState( ); char command = ' '; Console.WriteLine("Welcome to \"The State Game\"!"); Console.WriteLine("You are standing here looking relaxed!"); while (command != 'e') { Console.WriteLine("\nWhat would you like to do now "); Console.Write(" Move Attack Stop Run Panic Exit the game: ==>"); string choice; do choice = Console.ReadLine( ); while (choice==null); command = choice[0]; context.Request(command); } } } } /* Output Welcome to "The State Game"! You are standing here looking hesitant! What would you like to do now Move Attack Stop Run You start moving What would you like to do now Move Attack Stop Run You need to stop moving first What would you like to do now Move Attack Stop Run You stand still in a dark room

Note that connections are expensive resources on a server, and you should take every precaution to prevent connection leaks, which are orphaned connections. Every time you open a connection, you must close that connection. Therefore, it s best to wrap your data access code in a try...catch block and place the SqlConnection.Close method invocation in a finally block, or create the SqlConnection in a using statement. The using statement will call the connection s Dispose method when it goes out of scope, thereby closing the database connection for you. This way, the connection is assured to be closed, even if your code sustains an error while accessing the data. It is also highly recommended that when developing data applications, you open them as late as possible (i.e., perform all required initialization before you open the connections to your database) and close them as early as possible (i.e., process any resulting DataSet after you close the connection), unless you have to keep the connection open for some compelling reason. The goal here is to minimize the time connections are held open, which serves to increase scalability.

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What would you like to do now Move Attack Stop Run Panic You start Panicking and begin seeing things What would you like to do now Move Attack Stop Run You run around in your panic What would you like to do now Move Attack Stop Run