JIExplorer is a java image viewer / explorer desk top application modeled after ACDSee image viewer. Features include: thumbnails, preview panel, key word, category, and date image management, image zooming, full screen, slide shows. Supported image

创建透明窗口及其应用 屏幕画笔,Java源码，值得参考,建议下载-Create a transparent window and its application- screen brush