android自更新时下载出现的问题

之前做过一个电视台app,电视台app每次启动时会访问服务器,判断是否需要下载新版本

但是下载时老是下载失败,apk包总是下载不下来.到底是什么原因呢?

服务器下载接口如下:

/*** * 下载apk * @param path * @param request * @return * @throws IOException */@RequestMapping(value = "/download"/*, headers = {"content-type=application/json"}*/)    public ResponseEntity<byte[]> download( String path,HttpServletRequest request) throws IOException {    AccessLog accessLog=logInto(request);accessLog.setDescription("下载客户端");    if(!ValueWidget.isNullOrEmpty(request.getContentType())&& request.getContentType().toLowerCase().contains("application/json")){    String requestStr=WebServletUtil.getRequestQueryStr(request, null);    System.out.println(requestStr);    Map queryMap=JSONPUtil.getMapFromJson(requestStr);    if(!ValueWidget.isNullOrEmpty(queryMap)){    path=(String) queryMap.get("path");    }    }    if(ValueWidget.isNullOrEmpty(path)){    System.out.println("download failed");    accessLog.setOperateResult("下载失败,没有传递path参数");    logSave(accessLog, request);    return null;    }    String realpath =WebServletUtil.getUploadPath(request, "upload/download/apk", request.getSession().getServletContext(), Constant2.SRC_MAIN_WEBAPP);    if(!realpath.endsWith(File.separator)){    realpath=realpath+File.separator;    }        HttpHeaders headers = new HttpHeaders();        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);        String fullpath=realpath+path;                System.out.println("download path:"+fullpath);        headers.set(Constant2.CONTENT_DISPOSITION,WebServletUtil.getContentDisposition(true, path));        accessLog.setOperateResult("下载成功,下载文件:"+fullpath+" ,size:"+FileUtils.getFileSize2(fullpath));logSave(accessLog, request);        return new ResponseEntity<byte[]>(FileUtils.getBytes4File(fullpath),                                          headers, HttpStatus.CREATED);    }

安卓端调用的下载方法(核心代码)如下:

/*** *  * @param huc * @param sendBytes * @param mode * @param isWrite2file *            : 是否写入文件 * @return * @throws Exception */private static byte[] connection(HttpURLConnection huc,boolean isWrite2file, Object file, String sizeHeadKey)throws Exception {int resCode = huc.getResponseCode();if (resCode == HttpURLConnection.HTTP_OK) {int contentLength = 0;if (ValueWidget.isNullOrEmpty(sizeHeadKey)) {// 若header中没有sizecontentLength = huc.getContentLength();} else {String sizeHeaderValue = huc.getHeaderField(sizeHeadKey);if (!ValueWidget.isNullOrEmpty(sizeHeaderValue)) {contentLength = Integer.parseInt(sizeHeaderValue);}}if (isDetail) {System.out.println("[connection]contentLength:" + contentLength);responseHeaderFields = huc.getHeaderFields();String downloadHeader = "Content-Disposition";if (!ValueWidget.isNullOrEmpty(responseHeaderFields)) {List<String> ContentDispositions = responseHeaderFields.get(downloadHeader);if (!ValueWidget.isNullOrEmpty(ContentDispositions)) {String ContentDisposition = ContentDispositions.get(0);System.out.println("ContentDisposition:"+ ContentDisposition);System.out.println("ContentDisposition convertISO2UTF:"+ SystemHWUtil.convertISO2UTF(ContentDisposition));System.out.println("ContentDisposition convertISO2GBK: "+ SystemHWUtil.convertISO2GBK(ContentDisposition));}}for (Object obj : responseHeaderFields.keySet()) {List<String> list = responseHeaderFields.get(obj);if (!ValueWidget.isNullOrEmpty(list)) {System.out.println(obj + " : "+ SystemHWUtil.formatArr(list, ";"));}}System.out.println("[connection]contentLength:" + contentLength);}if (contentLength > 0) {if (isDetail)System.out.println("[HttpSocketUtil.connection]httputil,contentLength:"+ contentLength);// return readData(huc);File file2 = null;if (isWrite2file) {if (file instanceof File) {file2 = (File) file;writeFileFromLength(huc, contentLength, file2);if (isDetail) {System.out.println("download success:"+ file2.getAbsolutePath());}} else {writeFileFromLength(huc, contentLength,(OutputStream) file);}return null;} else {return readDataFromLength(huc, contentLength);}} else {if (isWrite2file) {InputStream in = huc.getInputStream();FileUtils.writeIn2OutputCloseAll(in, new FileOutputStream((File) file));if (isDetail) {System.out.println("download success:"+ ((File) file).getAbsolutePath());}return null;}return readData(huc);}} else {System.out.println("response Code:" + resCode);}return null;}

代码本身是没有逻辑错误的.花了很长时间才找到原因,是定义的response的status code不一致.

后台设置的status code是201,而android端判断的status code是200,不一致导致下载流程没有走到下载逻辑.

修改方法:把后台的status code改为200 就OK了

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