SpringMVC

MVC

​ m：model:模型，javabean

​ v：view：视图，html/jsp

​ c：controller：控制器：servlet

Controller.java 控制器

package com.qfedu.mvc.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 自定义接口，实现管理多个请求,在模拟Spring MVC中的控制器
 */
public interface Controller {

    String handleRequest(HttpServletRequest request, HttpServletResponse response);
}

制定规则，让所有的控制器的业务类都实现这个接口，重写处理业务的具体方法.

ProductInputController.java

package com.qianfeng.controller;

import com.qianfeng.bean.Product;
import com.qianfeng.form.ProductForm;
import com.qianfeng.validate.ProductValidate;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;

public class ProductDetail implements Controller {

    @Override
    public String handleRequest(HttpServletRequest request, HttpServletResponse response) {
        String pname = request.getParameter("pname");
        String pid = request.getParameter("pid");
        String sprice = request.getParameter("price");
        String image = request.getParameter("image");

        double price = sprice == null||sprice.length()==0?0.0:Double.parseDouble(sprice);

        ProductForm pf = new ProductForm();
        pf.setPname(pname);
        pf.setPrice(price);
        pf.setImage(image);

        ProductValidate pv = new ProductValidate();
        List<String> errors = pv.validate(pf);
        String url = null;
        if(errors!=null && !errors.isEmpty()){
            request.setAttribute("errors",errors);
            url = "/WEB-INF/view/index.jsp";
        }else {
            Product p = new Product();
            p.setPid(Integer.parseInt(pid));
            p.setPname(pf.getPname());
            p.setPrice(pf.getPrice());
            p.setImage(pf.getImage());
            request.setAttribute("product",p);
            url = "/WEB-INF/view/product.jsp";
        }
        return url;
    }
}

ProductInput.java

package com.qianfeng.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ProductInput implements Controller {
    @Override
    public String handleRequest(HttpServletRequest request, HttpServletResponse response) {
        return "/WEB-INF/view/index.jsp";
    }
}

返回转发页面.
/[/n今天是我在千锋线上学习的第14天，武汉加油！]/