Java下载图片并压缩

深碍√TFBOYSˉ_ 2022-02-12 19:43 253阅读 0赞

1.  前端获取URL

//======================照片批量下载===============================
    
    
     	function downImg(){
    		var urlArr = new Array() ;
    		$("#tableList tbody input[type='checkbox']").each(function(i,v){
    			if(v.checked){
    				            urlArr.push($(v).parent().parent().children().eq(2).children().eq(0).attr('href'));				
    				window.location.href = "${pageContext.request.contextPath }/broker/sign/dowlandImg.in?urlArr="+urlArr;
    			}
    		});
    		
    	}

1.  Controller接收URL压缩下载

public void dowlandImg(HttpServletResponse response, String[] urlArr) {
    		try {
    			String downloadFilename = "XXX.zip";// 文件的名称
    			downloadFilename = URLEncoder.encode(downloadFilename, "UTF-8");// 转换中文否则可能会产生乱码
    			response.setContentType("application/octet-stream");// 指明response的返回对象是文件流
    			response.setHeader("Content-Disposition", "attachment;filename=" + downloadFilename);// 设置在下载框默认显示的文件名
    			ZipOutputStream zos = new ZipOutputStream(response.getOutputStream());
    			String[] files = urlArr;
    			for (int i = 0; i < files.length; i++) {
    				URL url = new URL(files[i]);
    				zos.putNextEntry(new ZipEntry(i + ".jpg"));//在压缩文件中建立名字为XXX的文件
    				BufferedImage buffImg = ImageIO.read(url);//读取图片
    				BufferedImage image = new BufferedImage(200, 200, BufferedImage.TYPE_INT_BGR);
    		        Graphics graphics = image.createGraphics();
    		        graphics.drawImage(buffImg, 0, 0, 200, 200, null);//绘制缩小后的图
    				ByteArrayOutputStream os = new ByteArrayOutputStream();
    				ImageIO.write(image, "jpg", os);
    				InputStream fis = new ByteArrayInputStream(os.toByteArray());
    				byte[] buffer = new byte[1024];
    				int r = 0;
    				while ((r = fis.read(buffer)) != -1) {
    					zos.write(buffer, 0, r);
    				}
    				fis.close();
    			}
    			zos.flush();
    			zos.close();
    		} catch (Exception e) {
    			logger.error("下载XXX错误", e);
    		}
    	}