背景描述:最近做到一个项目,有个商品登记功能。登记的信息包括:基本信息若干(文字信息);图片信息,要求将图片保存到数据表中的image字段(sql server 数据库)
jsp 页面:
<form name="uploadForm" id method="post" action="${base}goods/doUploadFile" enctype="multipart/form-data"> input type="file" name="image" /><br/> ="submit" value="上传" class="btn4" /> </form>
spring_mvc.xml配置
bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> bean>
Controller:
@RequestMapping("/doUploadFile") public ModelAndView doUploadFile(HttpServletRequest request,HttpServletResponse response,HttpSession session) throws Exception,IOException { // 转型为MultipartHttpRequest: MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; 获得文件: multipartfile file = multipartRequest.getFile("image"); 获得文件名: String filename = file.getoriginalFilename(); InputStream input = file.getInputStream(); String path = "D:/goodsImages";下边这个path是写在配置文件里边的,方便修改,这个方法很长但或得的结果就是路劲D:/goodsImages String path = ConfigConstants.getInstance() .get("goods.uploadImage.dir"); File savePath = new File(path); if (!savePath.exists()) { 文件夹 savePath.mkdir(); } SaveFileFromInputStream(input,savePath.toString(),filename); String result = "上传成功!"; ModelAndView modelAndView = new ModelAndView("goods/uploadSuccess"); modelAndView.addobject("result",result); modelAndView.addobject("filename"return modelAndView; }
如此上传就搞定了。
1.项目中导入 jar 包 cos.jar
2.表单: enctype="multipart/form-data"
3.处理方法:主要用到 MultipartRequest 类,详细情况查看:http://www.servlets.com/cos/javadoc/com/oreilly/servlet/MultipartRequest.html
@RequestMapping(value = "/uploadImage.do"public String uploadImage(HttpServletRequest request) Exception { MultipartRequest mr = null; int maxPostSize = 1 * 100 * 1024; mr=new MultipartRequest(request,"E:\\goodsImages",maxPostSize,"GBK"return ; }
二、生成略缩图。
public void createIcon() { try { File fiBig = new File("D:/log/tickit.png"); 大图文件 File foSmall = new File("D:/log/tickitIcon.png"); 将要转换出的小图文件 AffineTransform transform = AffineTransform(); 读取图片 BufferedImage bis = ImageIO.read(fiBig); 获得图片原来的高宽 int w = bis.getWidth(); int h = bis.getHeight(); double scale = (double) w / h; 等比例缩放 int NowWidth = 120; int NowHeight = (NowWidth * h) / w; if (NowHeight > 120) { NowHeight = 120; NowWidth = (NowHeight * w) / h; } double sx = (double) NowWidth /double sy = (double) NowHeight / h; transform.setToScale(sx,sy); AffineTransformOp ato = new AffineTransformOp(transform,); BufferedImage bid = BufferedImage(NowWidth,NowHeight,BufferedImage.TYPE_3BYTE_BGR); ato.filter(bis,bid); ImageIO.write(bid,"png"catch (Exception e) { e.printstacktrace(); } }
1.图片实体类的 图片字段(picture) 用 byte[]类型
@Entity @Table(name = "spaq_pic") class GoodsPic { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name = "pic_id"private Long picId; @Column(name = "pic_name" String picName; @Column(name = "pic_descr" String picDescr; @Column(name = "picture"private byte[] picture;// 省略其他字段及get,set方法 }
2.代码,读取本地图片储存在byte[]中,付给实体类的picture字段,调用 hibernate的save方法保存
/** * hibernate保存图片到数据表 */ @Transactional(readOnly = falsevoid hibsaveImage(GoodsPic gp,String path) {GoodsPic为图片实体类,path为图片所在磁盘的路径 { InputStream in = ; in = FileInputStream(path); byte[] b = new [in.available()]; in.read(b); in.close(); gp.setPicture(b); myDao.save(gp); } (Exception e) { e.printstacktrace(); } }
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