.NET/Java PDF, Tiff, Barcode SDK Library

While reading the explanation of filters, you may have been puzzled by the term thread context and may have expected the authentication information to be stored within the request context. Storing the authentication information within the request context makes perfect sense for a web application when you are concerned with restricting access to URLs and otherwise carrying out web-oriented security operations, but there is more to security than preventing access to URLs. You may wish to write code that is aware of the specifics of the user currently accessing the database. In our example application, a typical example of this requirement is the need to ensure that a specific user does not access other users timesheets. The URL concerns cannot help us: all users access the timesheet application by the same means, so we need to ensure that a user who manages to get a request for another user s timesheet past the filters cannot actually access the data in question. The simplest way to prevent this access is to check the authenticated user s name against the request for the data. To do so, we need to access the information in layers of the software that should not have access to a servlet request object. These layers should work equally well in a stand-alone Swing application that carries out its authentication by using a dialog box. The authentication and authorization information is therefore stored in a thread-local variable that is accessible through a static method on the SecurityContextHolder class. A call to this getContext() method allows the authentication object established elsewhere to be retrieved, as shown in Listing 7-21.

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he Integrated Development Environment (IDE) we will be using to build our ASP.NET 2.0 applications is Visual Web Developer (VWD). Throughout this chapter we will take a high-level guided tour of the IDE so you become familiar with most of the important tools available to build your applications more quickly and with less hassle. As you will see, building web applications with VWD is no hassle at all. Although hundreds of pages could be written to encompass all the productivity tools available in such a powerful development environment, this chapter will focus on the high-level items you will want to know right away. A lot of the other wizards and tools available are covered throughout the book as we discuss the aspects of the technology we are dealing with. For example, we will discuss the wizards that are used to configure a data source in the chapters that discuss working with data. In this chapter we will examine the following: How to use the key menu and toolbar buttons How to use the Help system How to work with the many available window panes How to work effectively in the code editor How to configure your development environment

namespace FirstGame { /// <summary> /// This is a game component that implements the rocks the player must avoid. /// </summary> public class Meteor : Microsoft.Xna.Framework.DrawableGameComponent { protected Texture2D texture; protected Rectangle spriteRectangle; protected Vector2 position; protected int Yspeed; protected int Xspeed; protected Random random; // Width and height of sprite in texture protected const int METEORWIDTH = 45; protected const int METEORHEIGHT = 45; public Meteor(Game game, ref Texture2D theTexture) : base(game) { texture = theTexture; position = new Vector2(); // Create the source rectangle. // This represents where the sprite picture is in the surface spriteRectangle = new Rectangle(20, 16, METEORWIDTH, METEORHEIGHT); // Initialize the random number generator and put the meteor in // its start position random = new Random(this.GetHashCode()); PutinStartPosition(); } /// <summary> /// Initialize meteor position and velocity /// </summary> protected void PutinStartPosition() { position.X = random.Next(Game.Window.ClientBounds.Width - METEORWIDTH); position.Y = 0; Yspeed = 1 + random.Next(9); Xspeed = random.Next(3) - 1; } /// <summary> /// Allows the game component to draw your content in the game screen

A typical example of Spring s helpfully catholic perspective is in its support for creating DAO classes. Spring provides a common conceptual approach of template and helper classes that you will examine in more detail in 4. Specific classes are provided for the various database persistence tools, including plain JDBC, but also ORM tools such as Hibernate, iBATIS, and TopLink. Security is addressed by the Acegi Spring Security component. This provides a comprehensive suite of tools for enforcing authentication and authorization in a web application. I discuss the Spring Security framework in 7. Spring has a wealth of other features that are not specific to any one framework, but which are enormously helpful. There is support for a suite of view technologies, including traditional JSPs but also encompassing XML, PDF files, Apache Velocity, and even Microsoft Excel spreadsheets. Support for features such as the Jakarta Commons file-upload utilities and the notoriously tricky JavaMail API turn otherwise problematic tasks into relatively simple configuration options.

/// </summary> public override void Draw(GameTime gameTime) { // Get the current sprite batch SpriteBatch sBatch = (SpriteBatch) Game.Services.GetService(typeof(SpriteBatch)); // Draw the meteor sBatch.Draw(texture, position, spriteRectangle, Color.White); base.Draw(gameTime); } /// <summary> /// Allows the game component to update itself. /// </summary> /// <param name="gameTime">Provides a snapshot of timing values.</param> public override void Update(GameTime gameTime) { // Check if the meteor is still visible if ((position.Y >= Game.Window.ClientBounds.Height) || (position.X >= Game.Window.ClientBounds.Width) || (position.X <= 0)) { PutinStartPosition(); } // Move meteor position.Y += Yspeed; position.X += Xspeed; base.Update(gameTime); } /// <summary> /// Check if the meteor intersects with the specified rectangle /// </summary> /// <param name="rect">test rectangle</param> /// <returns>true, if has a collision</returns> public bool CheckCollision(Rectangle rect) { Rectangle spriterect = new Rectangle((int)position.X, (int)position.Y, METEORWIDTH, METEORHEIGHT); return spriterect.Intersects(rect); } } }