(Android side and servlet side use JSON to exchange data information. For example, some codes are implemented in the JSP environment. Programmers who have been engaged in Java Web development (JSP) should not be unfamiliar with Servlets. Json is also a popular technology at present, so this combination of Android, Json and Servlet, for example, is still of certain reference value. Note: The IP address of the server should not be written as localH/OST. Even in the local test, the IP address of the local machine should also be written. The localH/OST will be regarded as the simulator itself.)
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