servlet的封装
比如：用户操作相关servlet管理
Baseservlet
1 package cn.hoagn.servlet;
2
3 import javax.servlet.ServletException;
4 import javax.servlet.http.HttpServlet;
5 import javax.servlet.http.HttpServletRequest;
6 import javax.servlet.http.HttpServletResponse;
7 import java.io.IOException;
8 import java.lang.reflect.InvocationTargetException;
9 import java.lang.reflect.Method;
10
11
12 public class BaseServlet extends HttpServlet {
13 @Override
14 protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
15 // super.service(req, resp);
16
17 System.out.println("方法被执行了");
18
19 // 获取路径
20 String requestURI = req.getRequestURI();
21 StringBuffer requestURL = req.getRequestURL();
22 System.out.println("requestURI:"+requestURI+" requestURL:"+requestURL); // requestURI:/user/da requestURL:http://localhost/user/da
23 // 截取
24 String methonName = requestURI.substring(requestURI.lastIndexOf("/")+1); //
25 System.out.println(methonName); // da
26
27 System.out.println(this); // cn.itcast.travel.servlet.UserServlet@3599a2d1
28
29 // 分发
30
31 try {
32 // 获取方法
33 Method declaredMethod = this.getClass().getMethod(methonName, HttpServletRequest.class, HttpServletResponse.class);
34 // 忽略访问权限修饰，获取方法
35 // Method declaredMethod = this.getClass().getDeclaredMethod(methonName, HttpServletRequest.class, HttpServletResponse.class);
36 //暴力反射
37 // declaredMethod.setAccessible(true);
38
39 // 执行方法
40 declaredMethod.invoke(this,req,resp);
41
42 } catch (NoSuchMethodException e) {
43 e.printStackTrace();
44 } catch (IllegalAccessException e) {
45 e.printStackTrace();
46 } catch (InvocationTargetException e) {
47 e.printStackTrace();
48 }
49
50
51 }
52 }
UserServlet
package cn.hogan.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/user/*")
public class UserServlet extends BaseServlet {
public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("执行了add方法");
}
public void get(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("执行了get方法");
}
}
