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　　The application layer here generally refers to the application and data processing at the server level. It generally consists of a map server, a database server, and a business logic server. Map servers are commonly found on Google and Baidu in China. Of course, there is also support for others, but in the past, the two were mainstream. Google's interface and functions are very powerful, suitable for later expansion and various scenarios. Baidu is a rising star with independent data sources, clear maps, support for 3D maps, and a good domestic experience with fast map loading speed. Many websites also support many third-party maps, but I personally don't think it's necessary. If you want to achieve the ultimate in any platform and meet the needs and experiences of users, it's enough. The focus is on the application and user experience, and no user will have to switch back and forth between maps and play. Google Maps has multiple calling methods, but Flex has been largely abandoned after the Google 3.0 API, and its experience is far inferior to that of JavaScript implementation.

　　Most databases are based on MySQL. Of course, individual websites may also choose other databases for security, technical support, and other reasons. The application server is mainly based on Java, and the front-end interaction is mainly based on JSP. The backend socket data receiving part can be used with universal NIO+Hibernate. You can also choose more efficient autonomous server programs yourself. The entire backend is the key and core of the system, and a well-designed server architecture determines the functionality and user experience of the entire system.

　　Mobile applications are also an important part of the application layer, mainly composed of various mobile application software, smartphones, PADs, etc., to achieve real-time data sharing and analysis.

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