4-6 4-7店铺注册之Controller层的实现

目录

 

1、创建ShopManagementController

2、编写HttpServletRequestUtil类解析HttpServletRequest的参数 

3、引入json解析的jar包依赖

4、接收并转化响应的参数，包括店铺信息及图片信息

5、注册店铺

---

1、创建ShopManagementController

先完成controller 相关的springMVC标签的定义

注意：

记得写@Controller

第三个红框method是POST，用于提交前台的表单数据

ResponseBody 是将Map转为JSON

HttpServletRequest用于存储前台提交的数据

2、编写HttpServletRequestUtil类解析HttpServletRequest的参数 

 

import javax.servlet.http.HttpServletRequest;

/**
 * 解析HttpServletRequest的参数
 * @author shawn
 *
 */
public class HttpServletRequestUtil {
	public static int getInt(HttpServletRequest request,String key) {
		try {
			//从request中对应键位为key的值，转成整型
			return Integer.decode(request.getParameter(key));
		} catch(Exception e) {
			return -1;
		}
	}
	
	public static long getLong(HttpServletRequest request,String key) {
		try {
			//从request中提取key，转成长整型
			return Long.valueOf(request.getParameter(key));
		} catch(Exception e) {
			return -1;
		}
	}
	
	public static Double getDouble(HttpServletRequest request,String key) {
		try {
			//从request中提取key，转成double型
			return Double.valueOf(request.getParameter(key));
		} catch(Exception e) {
			return -1d;
		}
	}
	
	public static boolean getBoolean(HttpServletRequest request,String key) {
		try {
			//从request中提取key，转成boolean型
			return Boolean.valueOf(request.getParameter(key));
		} catch(Exception e) {
			return false;
		}
	}
	
	public static String  getString(HttpServletRequest request,String key) {
		try {
			String result = request.getParameter(key);
			if(result != null) {
				result.trim();
			}
			if("".equals(result)) {
				result = null;
			}
			return result;
		} catch (Exception e) {
			return null;
		}
	}
}

3、引入json解析的jar包依赖

https://github.com/FasterXML/jackson-databind 查看API

将实体类转为json，或将json转为实体类

4、接收并转化响应的参数，包括店铺信息及图片信息

    1 接受前台传来的店铺相关的字符串信息

    2 转换成shop实体类，shop = mapper.readValue(shopStr, Shop.class); 这句话是按照API来写的。

      3 处理图片逻辑

5、注册店铺

 

这里addShop()报错，因为里面参数类型需要Shop和File类型（File类型是为了便于shopService做单元测试），而上面第二个参数传入的是CommonsMultipartFile类型，在这里不能转换为File。

 

解决方法：

由于shopImg是CommonsMultipartFile类型，查看其源码有转换为InputStream的方法

因此可以再将 InputStream转为File

添加方法

private static void inputStreamToFile(InputStream ins, File file) {
		FileOutputStream os = null;
		try {
			os = new FileOutputStream(file);
			int bytesRead = 0;
			byte[] buffer = new byte[1024];
			while((bytesRead = ins.read(buffer))!=-1) {
				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(ins!=null) {
					ins.close();
				}
			}catch (IOException e) {
				throw new RuntimeException("inputStreamToFile关闭IO产生异常"+e.getMessage());
			}
			
		}
	}

 

最终代码

@Controller
@RequestMapping("/shopadmin")
public class ShopManagementController {
	@Autowired 
	private ShopService shopService;
	@RequestMapping(value="/registershop",method=RequestMethod.POST)
	@ResponseBody
	private Map registerShop(HttpServletRequest request){
		Map modelMap = new HashMap();
		//1、接收并转化响应的参数，包括店铺信息及图片信息
		String shopStr = HttpServletRequestUtil.getString(request, "shopStr");
		ObjectMapper mapper = new ObjectMapper();
		Shop shop = null;
		try {
			//转换成shop实体类
			shop = mapper.readValue(shopStr, Shop.class);
		} catch(Exception e){
			modelMap.put("success", false);
			modelMap.put("errMsg", e.getMessage());
			return modelMap;
		}
		/**
		 * 以下处理图片相关逻辑
		 */
		CommonsMultipartFile shopImg = null;
		CommonsMultipartResolver commonsMultipartResolver  = new CommonsMultipartResolver(
				request.getSession().getServletContext());//从request会话中的上下文获取相关文件上传的内容
		//判断是否有上传的文件流
		if(commonsMultipartResolver.isMultipart(request)) {
			//将request转换成MultipartHttpServletRequest对象
			MultipartHttpServletRequest multipartHttpServletRequest = (MultipartHttpServletRequest)request;
			shopImg = (CommonsMultipartFile)multipartHttpServletRequest.getFile("shopImg");//shopImg是前端约定好的变量中传来的
		}else {
			modelMap.put("success", false);
			modelMap.put("errMsg", "上传图片不能为空");
			return modelMap;
		}
		//2、注册店铺
		if(shop!=null&&shopImg!=null) {
			PersonInfo owner = new PersonInfo();
			owner.setUserId(1L);
			shop.setOwner(owner);
			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 (IOException e) {
				modelMap.put("success", false);
				modelMap.put("errMsg", e.getMessage());
				return modelMap;
			}
			ShopExecution se = shopService.addShop(shop,shopImgFile);
			if(se.getState() == ShopStateEnum.CHECK.getState()) {
				modelMap.put("success", true);
			} else {
				modelMap.put("success", false);
				modelMap.put("errMsg", se.getStateInfo());
			}
			return modelMap;
		}else {
			modelMap.put("success", false);
			modelMap.put("errMsg", "请输入店铺信息");
			return modelMap;
		}
	}
	private static void inputStreamToFile(InputStream ins, File file) {
		FileOutputStream os = null;
		try {
			os = new FileOutputStream(file);
			int bytesRead = 0;
			byte[] buffer = new byte[1024];
			while((bytesRead = ins.read(buffer))!=-1) {
				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(ins!=null) {
					ins.close();
				}
			}catch (IOException e) {
				throw new RuntimeException("inputStreamToFile关闭IO产生异常"+e.getMessage());
			}
			
		}
	}
}