server
server is an app to response request.example of the httpserver
how to use httpserver.java
1.javac -d '{classDir}' '{httpserver.java path}'2.
java -cp '{classDir}' httpserver '{rootDir}'3. go to 'http://localhost:8080/*'.
if the response Content-Type must not be null, add the argument to 2.
java -cp '{classDir}' httpserver '{rootDir}' css[text/css]js[text/javascript]