近年來，Java已經是開發Web-based軟體系統的主流技術之一。由於Web-based軟體系統的開發技術不斷演進，以及開發過程中未考量到應用程式的品質，造成較早期所開發的Web-based軟體系統不易維護、品質不佳以及延伸性(extensibility)較低。除此之外，當這種系統需要與其它新開發的系統整合時，可能會有因為架構不同而無法整合的情況。在這種情形下就必須重新設計或是改進現有系統。與重新設計系統相較之下，改進現有系統可以花費較少的成本。
電腦軟體再造工程(software re-engineering)，是ㄧ種低成本、低風險的軟體改進方式。其方法是將原先存在的舊系統用新的方式重新實作，使系統變得更容易維護。本論文提出一個軟體再造方法，透過此方法可以有系統地將舊有Web-based Java軟體系統再造為Model-View-Controller (MVC)架構，以改良軟體系統的品質，讓系統更容易被維護。我們以中央研究院所開發的數位典藏系統為例，利用我們所提出的方法將原始系統再造為MVC架構的系統。

Recently, Java has become one of the mainstream technologies that develop Web applications. The evolution of the Web technologies has made early Web applications difficult to maintain and extend. In addition, it is likely that different architectures of systems result in failure to integrate with one another. Legacy systems can be improved by software evolution, which costs less than re-designing.
Software re-engineering is a low-cost and low-risk approach to software evolution. It re-implements legacy systems in a new way to improve ease of maintenance. This thesis suggests an approach of software re-engineering to improve the quality of software system and ease of maintenance, through which the legacy Web-based Java software system can be systematically re-engineered into Model-View-Controller (MVC) architecture. By using a digital archive system as an example, we demonstrate how a system is re-engineered into an MVC one.

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