一、后台方法
@RequestMapping("/getImageIo")
    public String getImage(HttpServletRequest request,
                           HttpServletResponse response, ModelMap model) throws Exception{
        String fileName = request.getParameter("fileName");
        String fileUrl = PATH;//图片存放路径参数：/weblogic/qywx/

//  String fileUrl = "/weblogic/shoppingMall";
//  PatternUtil.validNum(fileName, "100", "10");
//  String patternRole = "^\\d{5,100}.(jpg)|(png)|(jpeg)$";
//  if (!Pattern.matches(patternRole, fileName)) {
//   return null;
//  }
        FileInputStream fis = null;
        OutputStream toClient = null;
        try {
            fis = new FileInputStream(fileUrl + fileName);
            int i = fis.available();
            byte data[] = new byte[i];
            fis.read(data);
            response.setContentType("image/jpg");
            toClient = response.getOutputStream();
            toClient.write(data);
            toClient.close();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                fis.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            try {
                toClient.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        return null;
    }
二、前端HTML路径书写格式
参数：

ShowImageURL：http://10.96.97.21:8082/workweixin/

imageName1：图片名称

书写格式

var image1 = "[[${ShowImageURL}]]/getImageIo?fileName=[[${imageName1}]]" + ".png";