项目_1.3_手写SpringMVC框架

初步修改项目

package com.hy.servlet;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

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 com.hy.utils.StringUtil;

@WebServlet("/cs")
public class CoreServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String ac = request.getParameter("ac");
        System.out.println("======="+ac+"======");
        if (StringUtil.isEmpty(ac))
            ac = "index";

        // 获取当前类的所有方法
        Method[] methods = this.getClass().getDeclaredMethods();

        for (Method m : methods) {
            // 获取方法名称
            String methodName = m.getName();
            if (ac.equals(methodName)) {
                // 找到和ac同名的方法，那么通过反射技术调用它
                try {
                    m.invoke(this, request, response);
                    return;
                } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
                    e.printStackTrace();
                }
            }
        }

        throw new RuntimeException("ac值错误");
    }

    private void index(HttpServletRequest request, HttpServletResponse response) {
        System.out.println("aaaaaaaaaaa");
    }
}

　　

package com.hy.utils;

public class StringUtil {
    //判断字符串是否为null或者""
    public static boolean isEmpty(String str){
        return str==null || "".equals(str);
    }

    public static boolean isNotEmpty(String str){
        return !isEmpty(str);
    }

}

成功