WEB项目读取不在项目路径中放的文件，类似于E:/的某个文件，是访问不到的，除了在Tomcat下配置虚拟路径，下面就是这种方法 @RequestMapping(value = "/pic/mid-{mediaid:.*}", method = RequestMethod.GET) public void getpicByMediaid(HttpServletRequest request, HttpServletResponse response, @PathVariable("mediaid") String mediaid, @RequestParam(value = "w", defaultValue = "0") int w, @RequestParam(value = "h", defaultValue = "0") int h) throws IOException { response.setHeader("Cache-Control", "max-age=" + (7 * 24 * 60 * 60)); response.setDateHeader("Last-Modified", new Date().getTime()); try { if (mediaid.length() < 2) { response.sendError(404, "exp"); return; } String imgurl = rootpath + mediaid.substring(0, 2) + "/" + mediaid.substring(2); if (w != 0 || h != 0) { this.diplayImageBySize(request, response, imgurl, mediaid, w, h); } else { this.diplayImage(request, response, imgurl, mediaid); } } catch (Exception ex) { response.sendError(500, "exp"); return; } } 这个是Controller中的一个方法，是一个获取图片的 this.diplayImageBySize(request, response, imgurl, mediaid, w, h); 这个方法可以设置图片的宽和高 this.diplayImage(request, response, imgurl, mediaid); 这个方法直接获得图片 public void diplayImageBySize(HttpServletRequest request, HttpServletResponse response, String imgurl, String id, int w, int h) throws IOException { response.setHeader("Cache-Control", "max-age=" + (7 * 24 * 60 * 60)); response.setDateHeader("Last-Modified", new Date().getTime()); if (request.getHeader("If-Modified-Since") != null) { response.setStatus(304); return; } BufferedImage buffImg = dpservice.diplayImg(w + "," + h, imgurl); Iterator iter = ImageIO.getImageWritersByFormatName("jpeg"); ImageWriter writer = (ImageWriter) iter.next(); ImageWriteParam iwp = writer.getDefaultWriteParam(); iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); iwp.setCompressionQuality(0.9f); ColorModel colorModel = ColorModel.getRGBdefault(); iwp.setDestinationType(new javax.imageio.ImageTypeSpecifier(colorModel, colorModel.createCompatibleSampleModel(8, 8))); response.setContentType(request.getSession().getServletContext().getMimeType(id)); OutputStream os = response.getOutputStream(); MemoryCacheImageOutputStream output = new MemoryCacheImageOutputStream(os); writer.setOutput(output); IIOImage image = new IIOImage(buffImg, null, null); writer.write(null, image, iwp); writer.dispose(); output.flush(); output.close(); os.close(); buffImg = null; } public void diplayImage(HttpServletRequest request, HttpServletResponse response, String imgurl, String id) throws IOException { response.setHeader("Cache-Control", "max-age=" + (7 * 24 * 60 * 60)); response.setDateHeader("Last-Modified", new Date().getTime()); if (request.getHeader("If-Modified-Since") != null) { response.setStatus(304); return; } //String imgurl = String.format(this.imgpath, id, id); BufferedImage buffImg = ImageIO.read(new File(imgurl)); response.setContentType(request.getSession().getServletContext().getMimeType(id)); OutputStream os = response.getOutputStream(); ImageIO.write(buffImg, "JPEG", os); os.flush(); os.close(); buffImg = null; } 而在前台页面，HTML中可以直接以 <img src="http://项目/pic/mid-1"> 来直接显示图片
转载于:https://www.cnblogs.com/Secondnn/p/3683314.html
