Java 通过url下载图片

系统管理员 2024-02-19 12:52 47阅读 0赞

//web端通过点击下载图片到本地（图片url是服务上的访问路径）

前端代码：

说明：$\{url\}是图片路径：如[http://xxx/图片.png][http_xxx_.png]

//下载海报  
function downloadImg(url) \{  
window.location.href =url;  
\}

后端代码：

@RequestMapping(value = "/web/{url}")
    @ResponseBody
    public void downloadImg(HttpServletResponse response, @PathVariable String url) {
    OutputStream outputStream = null;
    InputStream inputStream = null;
    try {
        if (CommonUtil.isNotNull(url)) {
            logger.info("读取图片中");
            response.setContentType("application/force-download");
            response.setCharacterEncoding("utf-8");
            String fileName=activityId+".png";
            if(request.getHeader("user-agent").contains("Firefox"))//判断是否为火狐
                fileName=new String(fileName.getBytes("utf-8"), "ISO8859-1");
            else
                fileName=URLEncoder.encode(fileName, "utf-8");
            response.setHeader("Content-Disposition", "attachment;filename=\""+fileName+"\"");
    
            //图片下载
            URL url = new URL(url);
            URLConnection conn = url.openConnection();
            outputStream = response.getOutputStream();
            inputStream = conn.getInputStream();
            IOUtils.copy(inputStream, outputStream);
        }
    } catch (Exception e) {
        logger.error("下载图片失败",e);
    }finally {
        IOUtils.closeQuietly(inputStream);
        IOUtils.closeQuietly(outputStream);
    }
    }

**如果你是湖南的欢迎加入湖南人在深圳-Java群：557651502**

[http_xxx_.png]: http://imgtest.ematong.com/group1/M00/20/CF/wKgBa1vRb9-AABMaAAF1Oiro0SQ403.png