图片上传服务器-回显-蒲公英云

图片上传服务器-回显

jar包
jar包

配置文件

<!-- 文件上传解析器 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean>

service层

public String uploadimg(MultipartFile avata, HttpServletRequest request) {
        String fileurl = "";
        if (avata.isEmpty()) {
            System.out.println("无法找到文件");
            return "";
        } else {
            System.out.println("文件长度: " + avata.getSize());
            System.out.println("文件类型: " + avata.getContentType());
            System.out.println("文件名称: " + avata.getName());
            System.out.println("文件原名: " + avata.getOriginalFilename());
            System.out.println("========================================");
            String realPath = request.getSession().getServletContext()
                    .getRealPath("/upload");
            File targetFile = new File(realPath);
            if (!targetFile.exists()) {
                targetFile.mkdirs();
            }
            System.out.println(realPath);
            int i = avata.getOriginalFilename().lastIndexOf(".");// 返回最后一个点的位置
            String extension = avata.getOriginalFilename().substring(i + 1);// 取出扩展名
            String filename = UUID.randomUUID().toString() + "." + extension;
            fileurl = filename;
            try {
                avata.transferTo(new File(realPath, filename));
            } catch (IllegalStateException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return fileurl;
        }
    }

controller层

// 添加
    @RequestMapping("add.do")
    public String add(Item item,@RequestParam(value = "imgSize1File", required = false) MultipartFile file,HttpServletRequest request) {
        String path = itemService.uploadimg(file, request);
        item.setPic(request.getContextPath() + "/upload/" + path);
        itemService.add(item);
        return "redirect:findItem.do";
    }

jsp页面

js脚本
    function submitImgSize1Upload() { 
        var filePath = $("#imgSize1File").val();
        if (filePath == "") {
            $("#imgSize1File").after("<span class='messageImg' style='color: red'>商品图片不能为空!</span>");
        } else {
            var fileType = filePath.substring(filePath.lastIndexOf(".") + 1).toLowerCase();
            $(".messageImg").remove();
            if ("jpg" != fileType && "png" != fileType) {
                $("#imgSize1File").after("<span class='messageImg' style='color: red'>请上传JPG,PNG格式的图片</span>");
                $("#add").attr("disabled", "disabled");
            } else if (document.getElementById("imgSize1File").files[0].size / 1024 > 2048) {
                $("#imgSize1File").after("<span class='messageImg' style='color: red'>图片不能超过2MB</span>");
                $("#add").attr("disabled", "disabled");
            } else {
                $("#add").removeAttr("disabled");
                var reader = new FileReader();
                reader.readAsDataURL(document.getElementById("imgSize1File").files[0]);
                reader.onload = function(e) { 
                    var img = $("#imgSize1ImgSrc")[0];
                    img.src = this.result;
                }
            }
        }
    }
//页面
<td>商品图片<span style="color: red;"> *</span></td> <td> <p> <label></label> <img id='imgSize1ImgSrc' height="100" width="100" /> <span class='messageImg' style='color: black;'>图片不能超过2MB</span> <input type='file' id='imgSize1File' name='imgSize1File' class="file" onchange='submitImgSize1Upload()' /> </p> </td>