servlet上传图片

1.jar包

2. 前台

3.servlet

protected void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       PrintWriter out = response.getWriter();
       //文件上传的三部曲
       //创建工厂
       DiskFileItemFactory factoy=new DiskFileItemFactory();
       //创建解析器
       ServletFileUpload sfu=new ServletFileUpload(factoy);
       //设置上传文件的大小
       sfu.setFileSizeMax(1024*1024);
       //解析request
       try {
           List<FileItem> list=sfu.parseRequest(request);
           String name=list.get(0).getString("utf-8");
           String burden=list.get(1).getString("utf-8");
           String price=list.get(2).getString("utf-8");
           String price1=list.get(3).getString("utf-8");
           String brief=list.get(4).getString("utf-8");
           String typeid=list.get(5).getString("utf-8");
           System.out.println(list.get(6));
           /**
           * 上传图片
           */
           //设置图片保存的目录
           String path="D:/MyPicture/img/";
           //得到文件名称
           String fileName="m_"+UUID.randomUUID()+"_"+list.get(6).getName();
           System.out.println("fileName:"+fileName);
           //校验图片的格式
           if(!fileName.toLowerCase().endsWith(".gif")){
               System.out.println("图片格式不是gif格式");
               request.setAttribute("msg", "你的图片格式不是gif格式");
               request.getRequestDispatcher("/admin/menus_add.jsp").forward(request, response);
               return;
           }
           //使用目录和文件名称创建目标文件
           File f=new File(path,fileName);
           //保存文件
           list.get(6).write(f);
           //校验图片的尺寸
           ImageIcon imageIcon = new ImageIcon(f.getAbsolutePath());
           Image image=imageIcon.getImage();
           if(image.getWidth(null)>200 || image.getHeight(null)>200){
               f.delete();
               request.setAttribute("msg", "图片的尺寸太大");
               request.getRequestDispatcher("/admin/menus_add.jsp").forward(request, response);

           }
           //设置为menu的属性
           Menus menu = new Menus(name, typeid, burden, brief, price, price1, "/img/"+fileName);
           System.out.println("fileName:"+fileName);
           System.out.println(path);
           System.out.println(menu);
           if(menusService.add(menu)>0) {
               out.print("<script>"
                       + "alert('菜单添加成功！');"
                       + "window.parent.location.href='"
                       + request.getContextPath()+"/admin/main.jsp'"
                       + "</script>");
           }else {
               out.print("<script>"
                       + "alert('菜单添加失败！');"
                       + "window.parent.location.href='"
                       + request.getContextPath()+"/admin/menus_add.jsp'"
                       + "</script>");
           }

} catch (FileUploadException e) {
if(e instanceof FileUploadBase.FileSizeLimitExceededException){

               System.out.println("你上传的文件大于1M");
               request.setAttribute("msg", "你的图片大于1M");
               request.getRequestDispatcher("/admin/menus_add.jsp").forward(request, response);
               return;
           }
           e.printStackTrace();
       } catch (Exception e) {
           e.printStackTrace();
       }
   }

4.注意：在D盘创建目录 D:/MyPicture/img/

在tomcat 的service.xml里创建虚拟路径对应磁盘物理路径

5.遍历显示（需要查询数据库，省略）

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