校园商铺-6店铺编辑列表和列表功能-2店铺信息编辑之Controller层的实现

1.店铺编辑范围

除了店铺名称、店铺分类不可更改，其他信息（区域、地址、电话、缩略图、店铺简介）都可以更改。

2.编写获取店铺信息的controller

    @RequestMapping(value="/getshopbyid",method=RequestMethod.GET)
    @ResponseBody
    private Map<String,Object> getShopById(HttpServletRequest request){
        Map<String,Object> modelMap = new HashMap<String,Object>();
        Long shopId = HttpServletRequestUtil.getLong(request, "shopid");
        if(shopId > -1) {
            try {
                Shop shop = shopService.getByShopId(shopId);
                List<Area> areaList = areaService.getAreaList();
                modelMap.put("shop", shop);
                modelMap.put("areaList", areaList);
                modelMap.put("success", true);
            }catch (Exception e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.toString());
            }
        }else {
            modelMap.put("success", false);
            modelMap.put("errMsg", "empty shopId");
        }
        return modelMap;
    }

3.验证controller

访问地址http://127.0.0.1:18080/o2o/shopadmin/getshopbyid?shopid=1

4.更改店铺信息

店铺注册流程：

• 1.验证码校验
• 2.获取请求头的店铺信息 接收从前台传递的shopStr对象，将这个对象转换成Shop实体类
• 3.获取图片 将请求中的文件流从CommonsMultipartResolver解析为CommonsMultipartFile
• 4.注册店铺

更改店铺同注册流程：

• 1.验证码校验
• 2.获取请求头的店铺信息 接收从前台传递的shopStr对象，将这个对象转换成Shop实体类
• 3.获取图片 将请求中的文件流从CommonsMultipartResolver解析为CommonsMultipartFile
• 4.修改店铺

4.Session

在web开发中，服务器可以为每个用户浏览器创建一个会话对象，就是Session对象。一个浏览器独占一个Session对象。因此在保存用户数据时，服务器程序可以把用户信息写到用户浏览器独占的Session中，当用户使用浏览器访问服务器程序时，服务器程序可以从用户的Session中，取出该用户的数据为用户服务。服务器创建Session出来后，会把Session的ID号以cookie的形式回写给客户机，这样只要客户端的浏览器不关，再去访问服务器的时候，都会带着Session的ID号去。
服务器发现客户端的浏览器带Session的ID过来，就会使用内容中与之对应的Session为之服务。Session是有过期时间的，tomcat默认Session超时时间为30分钟。如果30分钟内没有在平台上做任何操作，Session就过期了。这种情况下，想通过Session去取相关的用户信息，就获取不到了。
Session主要用来保存店铺、用户信息。在我们去存储数据的时候，可以从里面取出想要的信息，同时还能方便我们做权限的验证。
在修改店铺信息的时候，是不需要修改用户的信息的，对它权限的验证，可以放在拦截器中去实现。
需要加入Session的地方是在注册中，获取用户的信息。

package com.csj2018.o2o.web.shopadmin;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import java.io.InputStream;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

import com.csj2018.o2o.dto.ShopExecution;
import com.csj2018.o2o.entity.Area;
import com.csj2018.o2o.entity.PersonInfo;
import com.csj2018.o2o.entity.Shop;
import com.csj2018.o2o.entity.ShopCategory;
import com.csj2018.o2o.enums.ShopStateEnum;
import com.csj2018.o2o.exceptions.ShopOperationException;
import com.csj2018.o2o.service.AreaService;
import com.csj2018.o2o.service.ShopCategoryService;
import com.csj2018.o2o.service.ShopService;
import com.csj2018.o2o.util.CodeUtil;
import com.csj2018.o2o.util.HttpServletRequestUtil;
import com.csj2018.o2o.util.ImageUtil;
import com.csj2018.o2o.util.PathUtil;
import com.fasterxml.jackson.databind.ObjectMapper;

// 首先在Controller里面定义了SpringMVC相关的标签，这个标签包含了Controller的访问路径以及registerregisterShop方法的访问路径，
@Controller
@RequestMapping("/shopadmin")
public class ShopManagerController {
    // 同时给它在执行的时候通过Spring容器注入之前实现好的ShopService实现类，用来提供addShop的服务。
    @Autowired
    private ShopService shopService;
    @Autowired
    private ShopCategoryService shopCategoryService;
    @Autowired
    private AreaService areaService;
    
    @RequestMapping(value="/getshopbyid",method=RequestMethod.GET)
    @ResponseBody
    private Map<String,Object> getShopById(HttpServletRequest request){
        Map<String,Object> modelMap = new HashMap<String,Object>();
        Long shopId = HttpServletRequestUtil.getLong(request, "shopid");
        if(shopId > -1) {
            try {
                Shop shop = shopService.getByShopId(shopId);
                List<Area> areaList = areaService.getAreaList();
                modelMap.put("shop", shop);
                modelMap.put("areaList", areaList);
                modelMap.put("success", true);
            }catch (Exception e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.toString());
            }
        }else {
            modelMap.put("success", false);
            modelMap.put("errMsg", "empty shopId");
        }
        return modelMap;
    }
    @RequestMapping(value = "getshopinitinfo",method = RequestMethod.GET)
    @ResponseBody
    private Map<String,Object> getShopInitInfo(HttpServletRequest request){
        Map<String,Object> modelMap = new HashMap<String,Object>();
        List<ShopCategory> shopCategoryList = new ArrayList<ShopCategory>();
        List<Area> areaList = new ArrayList<Area>();
        try {
            shopCategoryList = shopCategoryService.getShopCategoryList(new ShopCategory());
            areaList = areaService.getAreaList();
            modelMap.put("shopCategoryList", shopCategoryList);
            modelMap.put("areaList", areaList);
            modelMap.put("success",true);
        }catch(Exception e) {
            modelMap.put("success",false);
            modelMap.put("errMsg", e.getMessage());
        }
        return modelMap;
        
    }
    @RequestMapping(value = "/registershop", method = RequestMethod.POST)
    @ResponseBody
    private Map<String, Object> registerShop(HttpServletRequest request) {
        Map<String, Object> modelMap = new HashMap<String, Object>();
        //1.验证码校验
        if(!CodeUtil.checkVerifyCode(request)) {
            modelMap.put("success", "false");
            modelMap.put("message", "输入了错误的验证码");
            return modelMap;
        }
        //2.获取请求头的店铺信息 接收从前台传递的shopStr对象，将这个对象转换成Shop实体类
        String shopStr = HttpServletRequestUtil.getString(request, "shopStr");
        ObjectMapper mapper = new ObjectMapper();
        Shop shop = null;
        try {
            shop = mapper.readValue(shopStr, Shop.class);
        } catch (Exception e) {
            modelMap.put("success", false);
            modelMap.put("errMeg", e.getMessage());
            return modelMap;
        }
        // 3.获取图片 将请求中的文件流从CommonsMultipartResolver解析为CommonsMultipartFile
        CommonsMultipartFile shopImg = null;
        CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        if (commonsMultipartResolver.isMultipart(request)) {
            MultipartHttpServletRequest multipartHttpServletRequest = (MultipartHttpServletRequest) request;
            shopImg = (CommonsMultipartFile) multipartHttpServletRequest.getFile("shopImg");
        } else {
            modelMap.put("success", false);
            modelMap.put("errMsg", "上传图片不能为空");
            return modelMap;
        }
        // 4.注册店铺
        if (shop != null && shopImg != null) {
            /*
             * 添加Session
             * 注册店铺或对店铺做操作，是需要登陆的
             */
            PersonInfo owner = (PersonInfo) request.getSession().getAttribute("user");
            shop.setOwner(owner);
            
            /*
             * 由于addShop的第二个参数是File类型的，而传入的ShopImg是CommonsMultipartFile这样的一个类型，因此需要将CommonsMultipartFile转换成File类型
             File shopImgFile = new File(PathUtil.getImgBasePath() + ImageUtil.getRandomFileName());
            try {
                shopImgFile.createNewFile();
            } catch (IOException e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.getMessage());
                return modelMap;
            }

            try {
                inputStreamToFile(shopImg.getInputStream(), shopImgFile);
            } catch (Exception e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.getMessage());
                return modelMap;
            }
             */
            ShopExecution se;
            try {
                se = shopService.addShop(shop, shopImg.getInputStream(), shopImg.getOriginalFilename());
                if (se.getState() == ShopStateEnum.CHECK.getState()) {
                    /*
                     * 在店铺添加完成后，还需要做Session的操作。用户和店铺的关系是一对多的，即一个owner能够创建多个店铺。
                     * 因此需要在Session里面保存一个店铺列表来显示用户可以操作的店铺。
                     */
                    @SuppressWarnings("unchecked")
                    List<Shop> shopList = (List<Shop>) request.getSession().getAttribute("shopList");
                    if(shopList == null || shopList.size() == 0) {
                        shopList = new ArrayList<Shop>();
                    }
                    shopList.add(se.getShop());
                    request.getSession().setAttribute("shopList", shopList);
                    modelMap.put("success", true);
                } else {
                    modelMap.put("success", false);
                    modelMap.put("errMsg", se.getStateInfo());
                }

            }catch (ShopOperationException e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.getMessage());
            }catch (IOException e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.getMessage());
            }
            return modelMap;
        } else {
            modelMap.put("success", false);
            modelMap.put("errMsg", "请输入店铺信息");
            return modelMap;
        }

    }
    
    @RequestMapping(value = "/modifyshop", method = RequestMethod.POST)
    @ResponseBody
    private Map<String, Object> modifyShop(HttpServletRequest request) {
        Map<String, Object> modelMap = new HashMap<String, Object>();
        //1.验证码校验
        if(!CodeUtil.checkVerifyCode(request)) {
            modelMap.put("success", "false");
            modelMap.put("message", "输入了错误的验证码");
            return modelMap;
        }
        
        //2.获取请求头的店铺信息 接收从前台传递的shopStr对象，将这个对象转换成Shop实体类
        String shopStr = HttpServletRequestUtil.getString(request, "shopStr");
        ObjectMapper mapper = new ObjectMapper();
        Shop shop = null;
        try {
            shop = mapper.readValue(shopStr, Shop.class);
        } catch (Exception e) {
            modelMap.put("success", false);
            modelMap.put("errMeg", e.getMessage());
            return modelMap;
        }
        // 3.获取图片 将请求中的文件流从CommonsMultipartResolver解析为CommonsMultipartFile
        CommonsMultipartFile shopImg = null;
        CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        if (commonsMultipartResolver.isMultipart(request)) {
            MultipartHttpServletRequest multipartHttpServletRequest = (MultipartHttpServletRequest) request;
            shopImg = (CommonsMultipartFile) multipartHttpServletRequest.getFile("shopImg");
        }
        
        // 2.修改店铺
        if (shop != null && shop.getShopId() != null) {
            //由于图片是可上传、可不上传的，因此图片非空判断去除；取而代之确保shopId不为空
            //修改店铺信息不用从session获取用户信息
            PersonInfo owner = new PersonInfo();
            // 预期从Session获取，目前自定义，以后完善
            owner.setUserId(1L);
            shop.setOwner(owner);
            // 由于addShop的第二个参数是File类型的，而传入的ShopImg是CommonsMultipartFile这样的一个类型，因此需要将CommonsMultipartFile转换成File类型
/*
 * 这块代码，教程没有
            File shopImgFile = new File(PathUtil.getImgBasePath() + ImageUtil.getRandomFileName());
            try {
                shopImgFile.createNewFile();
            } catch (IOException e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.getMessage());
                return modelMap;
            }

            try {
                inputStreamToFile(shopImg.getInputStream(), shopImgFile);
            } catch (Exception e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.getMessage());
                return modelMap;
            }
*/
            
            ShopExecution se;
            try {
                if(shopImg == null) {
                    se = shopService.modifyShop(shop, null, null);
                }else {
                    se = shopService.modifyShop(shop, shopImg.getInputStream(), shopImg.getOriginalFilename());
                }
                if (se.getState() == ShopStateEnum.SUCCESS.getState()) {
                    modelMap.put("success", true);
                } else {
                    modelMap.put("success", false);
                    modelMap.put("errMsg", se.getStateInfo());  
                }
            }catch(ShopOperationException e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.getMessage());
            } catch (IOException e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.getMessage());
            }
            return modelMap;
        } else {
            modelMap.put("success", false);
            modelMap.put("errMsg", "请输入店铺Id");
            return modelMap;
        }

    }
    private static void inputStreamToFile(InputStream inputStream, File file) {
        FileOutputStream os = null;
        try {
            os = new FileOutputStream(file);
            int bytesRead = 0;
            byte[] buffer = new byte[1024];
            while ((bytesRead = inputStream.read(buffer)) > 0) {
                os.write(buffer, 0, bytesRead);
            }
        } catch (Exception e) {
            throw new RuntimeException("调用inputStreamToFile产生异常：" + e.getMessage());
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException e) {
                throw new RuntimeException("调用inputStreamToFile产生异常：" + e.getMessage());
            }
        }
    }
}