获取用户的根路径

一、方法

• ✅//这个方法用得比较多，动态获取应用的路径

    `String contextPath = request.getContextPath();`
    `System.out.println("应用的根路径" + contextPath);`

二、实现

public class RequestTestServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //这个方法用得比较多，动态获取应用的路径
        String contextPath = request.getContextPath();
        System.out.println("应用的根路径" + contextPath);
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.print(contextPath);
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
  <servlet>
    <servlet-name>RequestTestServlet</servlet-name>
    <servlet-class>servlet.RequestTestServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>RequestTestServlet</servlet-name>
    <url-pattern>/testrequest</url-pattern>
  </servlet-mapping>
</web-app>