Servlet 自定义请求方法分发

前提

 

代码

 1 @WebServlet("/ajaxTest1/*")
 2 public class BaseServlet1 extends HttpServlet {
 3 
 4     @Override
 5     protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
 6         //1.分割获得方法名
 7         String requestURI = req.getRequestURI();
 8         System.out.println("requestURI = " + requestURI);//打印结果：requestURI = /day17/ajaxTest1/add
 9         String meThodName = requestURI.substring(requestURI.lastIndexOf("/") + 1);
10         System.out.println("substring = " + meThodName);//打印结果：substring = add
11         //2.（反射）通过类对象获得该类所有方法
12         try {
13             Method declaredMethod = this.getClass().getDeclaredMethod(meThodName, HttpServletRequest.class, HttpServletResponse.class);
14             //3.执行方法
15             declaredMethod.invoke(this,req,resp);
16         } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
17             //4.使用404常量
18             resp.sendError(HttpServletResponse.SC_NOT_FOUND);
19         }
20 
21 
22     }
23 
24     public void add(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
25 
26         System.out.println("add 执行了");
27     }
28 }
29 /*===============================================================
30  *  启动Tomcat => 浏览器输入 => http://localhost/day17/ajaxTest1/add
31  * ==============================================================*/

 

posted @ 2021-11-30 21:26  徐州  阅读(63)  评论(0)    收藏  举报