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英文经典原著 Java Reflection in Action Java Reflection in Action is unique in presenting a clear account of all the cool things you can do with reflection, and at the same time providing the sound conceptual basis that developers need to create advanced applications. The book includes careful explanations of sometimes perplexing programming techniques along with enough background to understand how to extend and vary them. This book overcomes reflection’s reputation as a mysterious and esoteric philosophical pursuit, or as a set of messy error-prone coding tricks. As reflection becomes increasingly common and useful in all sorts of applications, it is great to finally have a book that features disciplined yet still creative and fun software engineering practices based on reflection. Even occasional users will immediately adopt the book’s patterns and idioms to solve common problems. Many of the examples can be directly adapted for customized solutions in diverse areas such as XML processing, automated software testing, and program analysis tools. Readers will also find underlying rationales for code performing introspection, proxies, class loading, and so on, that are often seen but not often explained well in everyday Java programs. And even experts will find new ideas and well-thought out advice for using some of the more subtle aspects of reflection. —Prof. Doug Lea, SUNY Oswego, author of Concurrent Programming in Java

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I’ve always felt that implementing a software system is much harder than it needs to be. It is difficult to map requirements to the implementation and then trace the implementation back to the requirements. Although many approaches—such as object-oriented programming, component-oriented programming, and design patterns—help to some extent, none of them satisfactorily addresses the system-level requirements, often referred to as crosscutting concerns, that must be included in multiple modules. I came across AspectJ version 0.3 in 1998 while looking for better ways to architect a Java-based system. AspectJ was an implementation of aspect-oriented programming (AOP), a new methodology that specifically targeted the management of crosscutting concerns. Even though AspectJ was in its infancy, I became fascinated by its potential. The struggle to keep up with all the new advances in the Java and XML world, along with other priorities in my life, prevented me from pursuing it further. Still, exploring AspectJ was always on my to-do list, and I started looking at it again when it was in version 0.8. By then, AspectJ had evolved into a much more powerful language. I started using AspectJ and found that the more I used it, the more I fell in love with it. Today, the current version of AspectJ (1.1)—which this book is based on—has morphed into a mature, robust language. In early 2002, I wrote a series of articles for JavaWorld describing AOP and AspectJ; the book you are holding grew out of that series. From reader responses, I realized that most developers understand that AspectJ can be xviii PREFACE used to modularize the crosscutting concern of logging, but they struggle to imagine how it may be applied beyond that. Logging, while an important concern, is not something developers lose sleep over. Logging using AspectJ, therefore, is best characterized as a vitamin and not a painkiller; while vitamins are important, often the need for them is not pressing enough to require immediate action. To further complicate the situation, the examples of AOP that are widely available today either repeat the same logging problem or are too abstract to be of immediate practical value. My mission statement for this book is “to be a key element in bringing AOP and AspectJ into everyday practice.” To accomplish this goal, the book not only presents the AspectJ language but also provides practical AspectJ-based solutions to a wide variety of real-world problems. You will find that you can utilize these solutions to quickly reap the benefits of the language. I have tried to use current technologies as the basis for these solutions so that you can readily apply them to your system. This also demonstrates that these latest technologies by themselves are not enough to manage crosscutting concerns, since combined with AspectJ, they provide a better solution. The book also presents a few original design patterns that increase the power of AspectJ significantly. It is not often that one gets to write about such an exciting new programming methodology and language. I enjoyed writing this book. I hope you will enjoy reading it.