src/edu/school/servlet/BaseServlet.java

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package edu.school.servlet;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Method;

public class BaseServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws javax.servlet.ServletException, IOException {
        String action=request.getParameter("action");
        try {
            Method method=this.getClass().getDeclaredMethod(action,HttpServletRequest.class,HttpServletResponse.class);//通过反射来调用业务，优化ifelse
            method.invoke(this,request,response);//调用目标业务，方法

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws javax.servlet.ServletException, IOException {
        doPost(request,response);
    }
}