[020] Android Simulator access to local Web apps

This article attempts to address the question of How to access the local Web app on the Android emulator? For example, start a Tomcat service on your development machine, then open a browser on your computer, and by default input http://localhost:8080/will be able to access Tomcat's main page, so if we want to access it on the Android emulator May I? The answer is yes, but the URL of the visit changes, why is it? Please keep looking down.
In the general development of Java Web programs, We usually use localhost or 127.0.0.1来 to access the native Web service, but if we use the same address in the Android emulator to access it, the Android emulator will not be able to access our services properly, why is it? We can understand this:android is the Linux kernel, including Android itself is an operating system, therefore, At this point we entered the browser in the simulator localhost or 127.0.0.1 represents the Android simulator (Android virtual machine), not your computer, understand? This is why you will report "Web page not available" When you use localhost in the emulator.

        How do you get access to Web apps on your local computer? On Android, map the address of our local computer to 10.0.2.2, so you can access the Web resources on the local computer on the emulator by simply replacing the original localhost or 127.0.0.1 with 10.0.2.2.
        Then we'll start Tomcat on the computer, then run the Android emulator, open the browser on the emulator, and then visit:/http Did 10.0.2.2:8888 already see that cute tomcat cat? Access is as shown. (