（三十）商品管理-添加商品(上传图片)

添加商品(上传图片) ???1.修改页面上添加连接 ???????/store/adminProduct?method=addUI ???2.在addUI请求转发到 添加页面 ???3.在表单页面上 ???????修改action : /store/addProductServlet ???????提交方式: method="post" ???????添加enctype属性: enctype="multipart/form-data" ???????给每个字段添加name属性 ???4.addProductServlet ???????通过request.getParameterMap获取的信息全部为空 ???????我们想使用beanuitls.populate(bean,map), ???????我们需要创建一个map集合 ,将前台接受过来信息手动的put到map中 ???????注意: ???????????商品的图片: ???????????????1:保存到服务器的磁盘 ???????????????2.在数据中添加图片的位置 ???????????????调用productservice完成添加商品操作 ???????重定向到所有的商品的上面 ???????????//////////////////////////////// ???//////////////////////////////// ???////////////////////////////////fileUpload使用 ???????????创建一个磁盘文件项工厂 ???????????????DiskFileItemFactory factory = new DiskFileItemFactory(); ???????????创建一个核心文件上传对象 ServletFileUpLoad ???????????????ServletFileUpload upload = new ServletFileUpload(factory); ???????????上传对象调用方法解析请求 获取一个List<FileItem> ???????????????List<FileItem> list = upload.parseRequest(request); ???????????遍历list获取每一个文件项 ???????????????????????????????isFormFiled():判断是否是普通上传组件 ???????????????????true:普通上传组件 ???????????????????false:文件上传组件 ???????????????getFiledName():获取表单子标签的name属性值 ???????????????若是普通的上传组件 ???????????????????getString("utf-8"):获取用户输入的值 ???????????????若是文件上传组件 ???????????????????getName():获取上传文件的名称 ???????????????????getInputStream():获取上传文件流 ???????????????????最后删除临时文件 ???????????????????????delete()

/** ????* 跳转到添加商品的页面 ????* @param request ????* @param response ????* @return ????* @throws Exception ????*/ ???public String addUI(HttpServletRequest request, HttpServletResponse response) throws Exception { ???????//查询所有的分类 返回list ???????CategoryService cs=(CategoryService) BeanFactory.getBean("CategoryService"); ???????List<Category> clist = cs.findAll(); ???????????????//将list放入request ???????request.setAttribute("clist", clist); ???????return "/admin/product/add.jsp"; ???}

package com.louis.web.servlet;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.Date;import java.util.HashMap;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.beanutils.BeanUtils;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.commons.io.IOUtils;import com.louis.domain.Category;import com.louis.domain.Product;import com.louis.service.ProductService;import com.louis.utils.BeanFactory;import com.louis.utils.UUIDUtils;import com.louis.utils.UploadUtils;/** * Servlet implementation class AddProduct */public class AddProductServlet extends HttpServlet { ???protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????????????try { ???????????//0.创建map 放入前台传递的数据 ???????????HashMap<String, Object> map = new HashMap<>(); ???????????????????????//创建磁盘文件项 ???????????DiskFileItemFactory factory = new DiskFileItemFactory(); ???????????//创建核心上传对象 ???????????ServletFileUpload upload = new ServletFileUpload(factory); ???????????//解析request ???????????List<FileItem> list = upload.parseRequest(request); ???????????//遍历集合 ???????????for (FileItem fi : list) { ???????????????//判断是否是普通的上传组件 ???????????????if(fi.isFormField()){ ???????????????????//普通上传组件 ???????????????????map.put(fi.getFieldName(),fi.getString("utf-8")); ???????????????}else{ ???????????????????//文件上传组件 ???????????????????//获取文件名称 ???????????????????String name = fi.getName(); ???????????????????????????????????????//获取文件的真实名称 ???xxxx.xx ???????????????????String realName = UploadUtils.getRealName(name); ???????????????????//获取文件的随机名称 ???????????????????String uuidName = UploadUtils.getUUIDName(realName); ???????????????????????????????????????//获取文件的存放路径 ???????????????????String path = this.getServletContext().getRealPath("/products/1"); ???????????????????????????????????????//获取文件流 ???????????????????InputStream is = fi.getInputStream(); ???????????????????//保存图片 ???????????????????FileOutputStream os = new FileOutputStream(new File(path, uuidName)); ???????????????????????????????????????IOUtils.copy(is, os); ???????????????????os.close(); ???????????????????is.close(); ???????????????????????????????????????//删除临时文件 ???????????????????fi.delete(); ???????????????????????????????????????//在map中设置文件的路径 ???????????????????map.put(fi.getFieldName(), "products/1/"+uuidName); ???????????????????????????????????} ???????????????????????????} ???????????????????????????????????????????????//1.封装参数 ???????????Product p = new Product(); ???????????BeanUtils.populate(p, map); ???????????????????????//1.1 商品id ???????????p.setPid(UUIDUtils.getId()); ???????????????????????//1.2 商品时间 ???????????p.setPdate(new Date()); ???????????????????????//1.3 封装cateogry ???????????Category c = new Category(); ???????????c.setCid((String)map.get("cid")); ???????????????????????p.setCategory(c); ???????????????????????//2.调用service完成添加 ???????????ProductService ps=(ProductService) BeanFactory.getBean("ProductService"); ???????????ps.add(p); ???????????????????????//3.页面重定向 ???????????response.sendRedirect(request.getContextPath()+"/adminProduct?method=findAll"); ???????} catch (Exception e) { ???????????e.printStackTrace(); ???????????request.setAttribute("msg", "商品添加失败~"); ???????????request.getRequestDispatcher("/jsp/msg.jsp").forward(request, response); ???????????return; ???????} ???????????????????} ???protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????// TODO Auto-generated method stub ???????doGet(request, response); ???}}

 ?<servlet> ???<description></description> ???<display-name>AddProductServlet</display-name> ???<servlet-name>AddProductServlet</servlet-name> ???<servlet-class>com.louis.web.servlet.AddProductServlet</servlet-class> ?</servlet> ?<servlet-mapping> ???<servlet-name>AddProductServlet</servlet-name> ???<url-pattern>/addProduct</url-pattern> ?</servlet-mapping>