SSM框架中图片的上传功能

雨点打透心脏的1/2处 2021-09-22 14:46 303阅读 0赞

谨以此篇，送给那些还不会用SSM框架上传图片的小伙伴  
废话不多说，直接上代码：  
jsp页面展示（仅展示关键部分）：  
这里需要注意的是：①：请求方法必须是POST  
②：需要使用组件 `<input type="file" name="file">`  
③：表单必须设置enctype=“multipart/form-data”

后台控制层：

@RequestMapping(value = "/addReport", method = RequestMethod.POST)
    	public void addReport(Report report, HttpSession session,
    			@RequestParam(value = "attachs", required = false) MultipartFile[] attachs, HttpServletRequest request,
    			HttpServletResponse response) {
    		// 定义上传文件的路径
    		String fileName;
    		// 定义文件保存的位置
    		 String path = request.getSession().getServletContext().getRealPath("/upload");
    		// 循环读取文件信息
    		for (int i = 0; i < attachs.length; i++) {
    			MultipartFile attach = attachs[i];
    			if (!attach.isEmpty()) {// 判断文件是否为空
    				// 判断是第几个文件
    				if (i == 0) {
    					fileName = upload(path, attach);
    					report.setReportPicture("upload\\"+fileName);
    				} else if (i == 1) {
    					fileName = upload(path, attach);
    					report.setReportUrl("upload\\"+fileName);
    				}
    			}
    		}
    		Integer count = reportService.addReport(report);
    		if (count > 0) {
    			try {
    				response.getWriter().write("<script>alert('新增成功！');location.href='"+ request.getServletContext().getContextPath() + "/findAllReport.action';</script>");
    			} catch (IOException e) {
    			}
    		} else {
    			try {
    				response.getWriter().write("<script>alert('新增失败！');location.href='"+ request.getServletContext().getContextPath() + "/findAllReport.action';</script>");
    			} catch (IOException e) {
    			}
    		}
    	}

实现上传功能的代码：

/**
    	 * 上传
    	* @Title: upload
    	* @Description: TODO
    	* @param @param path
    	* @param @param attach
    	* @param @return
    	* @return String
    	* @throws
    	 */
    	private String upload(String path, MultipartFile attach) {
    		String fileName;
    		File file;
    		//获取文件拓展名
    		fileName = attach.getOriginalFilename();
    		//新的文件名
    		fileName = System.currentTimeMillis()+fileName;
    		System.out.println(fileName);
    		//封装文件保存位置的全路径
    		file=new File(path, fileName);
    		if (!file.exists()) {
    			file.mkdirs();
    		}
    		//上传
    		try {
    			attach.transferTo(file);
    		} catch (IllegalStateException | IOException e) {
    			System.out.println("上传失败");
    		}
    		return fileName;
    	}

就到这里啦，service层和dao层不变…