[JavaScript知识库]java根据路径批量下载图片为zip

前台代码

//头工具栏事件
            table.on('toolbar(test)', function(obj){
                var checkStatus = table.checkStatus(obj.config.id);
                var requestNos = [];
                switch(obj.event){
                    case 'requestSeeInto':
                        var data = checkStatus.data;
                    //    console.log(data);
                        for(var i=0;i<data.length;i++){
                            requestNos.push(data[i].ID);
                        }
                };
                var requestData = requestNos.join(",");
                if(requestData==null||requestData==""){
                    layer.alert("请勾选文件序号");
                    return;
                }
              //  console.log(requestData);

                window.open("/dz_exchange/api/license/batchDownLoad?path="+encodeURI(requestData))
            });

后台代码：

 @RequestMapping(value = "/batchDownLoad", method = RequestMethod.GET)
    public void batchDownLoad() throws Exception {

        ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = requestAttributes.getRequest();
        HttpServletResponse response = requestAttributes.getResponse();
        //这里是前台传的以逗号分隔的id 根据id去分别查询对应的path
        String path = request.getParameter("path");
        String[] split = path.split(",");
        //响应头的设置
        response.reset();
        response.setCharacterEncoding("utf-8");
        response.setContentType("multipart/form-data");
        response.addHeader("Access-Control-Allow-Origin", "*");//解决跨域
        //设置压缩包的名字
        Date date = new Date();
        String billname = "附件包-" + date.getTime();
        String downloadName = billname + ".zip";
        //返回客户端浏览器的版本号、类型
        String agent = request.getHeader("USER-AGENT");
        try {
            //针对IE或者以IE为内核的浏览器：
            if (agent.contains("MSIE") || agent.contains("Trident")) {
                downloadName = java.net.URLEncoder.encode(downloadName, "UTF-8");
            } else {
                //非IE浏览器的处理：
                downloadName = new String(downloadName.getBytes("UTF-8"), "ISO-8859-1");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        response.setHeader("Content-Disposition", "attachment;fileName=\"" + downloadName + "\"");

        //设置压缩流：直接写入response，实现边压缩边下载
        ZipOutputStream zipos = null;
        try {
            zipos = new ZipOutputStream(new BufferedOutputStream(response.getOutputStream()));
            zipos.setMethod(ZipOutputStream.DEFLATED); //设置压缩方法
        } catch (Exception e) {
            e.printStackTrace();
        }
        //循环将文件写入压缩流
        DataOutputStream os = null;

        //查询数据库获取文件信息

        //遍历文件信息（主要获取文件名/文件路径等）
        for (int i = 0; i < split.length; i++) {
            //根据id数据库获取
            // 文件路径
            String filePath = addLicenseDao.queryFilepath(split[i]);
            System.out.println("filePath===" + filePath);
            File file = new File(filePath);
            if (!file.exists()) {
                throw new Exception();
            } else {
                try {
                    //添加ZipEntry，并ZipEntry中写入文件流
                    String fileName = file.getName();//.substring(0,authAttachmentDetail.getFileName().indexOf("."));
                    zipos.putNextEntry(new ZipEntry(fileName));
                    os = new DataOutputStream(zipos);
                    InputStream is = new FileInputStream(file);
                    byte[] b = new byte[100];
                    int length = 0;
                    while ((length = is.read(b)) != -1) {
                        os.write(b, 0, length);
                    }
                    is.close();
                    zipos.closeEntry();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        //关闭流
        try {
            os.flush();
            os.close();
            zipos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }