反射减少servlet数量

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每个servlet只做一件事的后果就是servlet的数量会变得很庞大不好管理，比如登录与注册功能就应该在同一个servlet中处理，可以叫UserServlet，利用反射可以减少servlet的数量

servlet实例：

package action;import dao.pojo.Message;//import org.hibernate.Query;import service.IService.IMsgService;import service.ImpService.ImpMsgService;import service.ServiceFactory;import javax.servlet.Servlet;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.List;/** * Created by yuzhiyun on 2016-10-10. */@WebServlet("*.msg")public class MsgServlet extends HttpServlet {    //弹幕service接口    IMsgService impMsgService;    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//        super.doPost(req, resp);        doGet(req, resp);    }    @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//        super.doGet(req, resp);        System.out.print("访问MsgServlet成功");        String temp = req.getServletPath().substring(1);        String methodName = temp.substring(0, temp.length() - 4);        Method method = null;        try {            method = getClass().getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);            method.invoke(this, req, resp);        } catch (NoSuchMethodException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        } catch (InvocationTargetException e) {            e.printStackTrace();        }//        resp.sendRedirect("./index.jsp");    }    public void save(HttpServletRequest req, HttpServletResponse resp) {        try {            resp.getWriter().print("存储数据");        } catch (IOException e) {            e.printStackTrace();        }        Message msg=new Message();        msg.setmMsgContent("多了一条");        impMsgService = ServiceFactory.getMsgService();        impMsgService.save(msg);    }    public void findAll(HttpServletRequest req, HttpServletResponse resp) {        try {            resp.getWriter().print("查询数据 ");        } catch (IOException e) {            e.printStackTrace();        }        impMsgService = ServiceFactory.getMsgService();        List list=impMsgService.findAll();        //打印        for (Object object : list) {            System.out.println(((Message) object).getmMsgContent());        }    }}

注意，注解@WebServlet(“*.msg”)不需要加斜杠/，
这样的话，在浏览器端访问

http://localhost:8080/findAll.msg

就会执行findAll（）函数
访问

http://localhost:8080/save.msg

就会执行save（）函数

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