最近在做一个临时的项目，APP端在检测到程序有更新时，需要去后台下载新的安装包。具体过程如下:
controller层：
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/** * 下载app * @param response */ @RequestMapping ( "downApp" ) @ResponseBody public void Download(HttpServletResponse response) { String fileName = "wuye.apk" ; String result = FileUtil.downloadFile(response, fileName); log.info( "app包下载结果:" ,result); } |
工具类：
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public class FileUtil {
public static String downloadFile(HttpServletResponse response, String fileName) { File path = null ; response.setHeader( "content-type" , "application/octet-stream" ); response.setContentType( "application/octet-stream" ); try { response.setHeader( "Content-Disposition" , "attachment;filename=" + java.net.URLEncoder.encode(fileName, "UTF-8" )); } catch (UnsupportedEncodingException e2) { e2.printStackTrace(); } byte [] buff = new byte [ 1024 ]; BufferedInputStream bis = null ; OutputStream os = null ; try { path = new File(ResourceUtils.getURL( "classpath:" ).getPath()); os = response.getOutputStream(); bis = new BufferedInputStream( new FileInputStream( new File(path + "/doc/" + fileName))); int i = bis.read(buff); while (i != - 1 ) { os.write(buff, 0 , buff.length); os.flush(); i = bis.read(buff); } } catch (FileNotFoundException e1) { //e1.getMessage()+"系统找不到指定的文件"; return "系统找不到指定的文件" ; } catch (IOException e) { e.printStackTrace(); } finally { if (bis != null ) { try { bis.close(); } catch (IOException e) { e.printStackTrace(); } } } return "success" ; } |
访问：http://127.0.0.1:8081/ymd/downApp 文件就下载下来了，本方法借鉴了 网络上的一些文章
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原文链接：https://HdhCmsTestcnblogs测试数据/shenziyang/p/12510731.html
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