1.頁面寫法

  $("#zdytp").attr("src",ApiUrl+"/abc/getpic?orgid=8020");



2.後臺寫法（引入提示jar包即可）
 IOUtils 引入依賴

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>
 @RequestMapping(value = "/imageDisplay")
 
 public  void imageDisplay(String orgid, HttpServletResponse response, HttpServletRequest request) throws IOException, SQLException {
          HashMap<String,Object> map = service.getById(orgid);//從資料庫查詢這條記錄資訊
     if (map != null && map.size() > 0) {
        byte[] bytes = (byte[]) map.get("orglogo");//orglogo為blob大欄位 儲存kb資料
 

        response.setContentType("image/jpeg, image/jpg, image/png, image/gif");  //設定輸出流內容格式為圖片格式
        InputStream in1 = new ByteArrayInputStream(bytes);  //將位元組流轉換為輸入流
        IOUtils.copy(in1, response.getOutputStream());//將位元組從 InputStream複製到OutputStream中
    }
    String logoRealPathDir = request.getSession().getServletContext()
 
            .getRealPath("/assets/images/icons.png");//獲取預設圖片路徑
    response.setContentType("image/jpeg, image/jpg, image/png, image/gif");
    InputStream is = new FileInputStream(logoRealPathDir);

    IOUtils.copy(is, response.getOutputStream());
}