路徑資訊

http://localhost:8080/myWebApp/PathServlet/.txt?param1=value1&param2=value2

req.getScheme()

http

req.getServerName()

localhost

req.getServerPort()

8080

req.getContextPath()

即環境路徑，/myWebApp

req.getServletPath()

即 Servlet 路徑，/Path/Servlet

req.getPathInfo()

即額外路徑，/1.txt

req.getRequestURI()

即環境路徑 + Servlet 路徑 + 額外路徑，/myWebApp/PathServlet/.txt

req.getRequestURL()

即完整路徑，http://localhost:8080/myWebApp/PathServlet/.txt

req.getQueryString()

即查詢參數 QueryString