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:

Java代码  

1. /*** 
2.      * 下载apk 
3.      * @param path 
4.      * @param request 
5.      * @return 
6.      * @throws IOException 
7.      */  
8.     @RequestMapping(value = "/download"/*, headers = {"content-type=application/json"}*/)  
9.     public ResponseEntity<byte[]> download( String path,HttpServletRequest request) throws IOException {  
10.         AccessLog accessLog=logInto(request);  
11.         accessLog.setDescription("下载客户端");  
12.         if(!ValueWidget.isNullOrEmpty(request.getContentType())&& request.getContentType().toLowerCase().contains("application/json")){  
13.             String requestStr=WebServletUtil.getRequestQueryStr(request, null);  
14.             System.out.println(requestStr);  
15.             Map queryMap=JSONPUtil.getMapFromJson(requestStr);  
16.             if(!ValueWidget.isNullOrEmpty(queryMap)){  
17.                 path=(String) queryMap.get("path");  
18.             }  
19.         }  
20.         if(ValueWidget.isNullOrEmpty(path)){  
21.             System.out.println("download failed");  
22.             accessLog.setOperateResult("下载失败,没有传递path参数");  
23.             logSave(accessLog, request);  
24.             return null;  
25.         }  
26.         String realpath =WebServletUtil.getUploadPath(request, "upload/download/apk", request  
27.                 .getSession().getServletContext(), Constant2.SRC_MAIN_WEBAPP);  
28.         if(!realpath.endsWith(File.separator)){  
29.             realpath=realpath+File.separator;  
30.         }  
31.         HttpHeaders headers = new HttpHeaders();  
32.         headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);  
33.         String fullpath=realpath+path;  
34.           
35.         System.out.println("download path:"+fullpath);  
36.         headers.set(Constant2.CONTENT_DISPOSITION,WebServletUtil.getContentDisposition(true, path));  
37.         accessLog.setOperateResult("下载成功,下载文件:"+fullpath+" ,size:"+FileUtils.getFileSize2(fullpath));  
38.         logSave(accessLog, request);  
39.         return new ResponseEntity<byte[]>(FileUtils.getBytes4File(fullpath),  
40.                                           headers, HttpStatus.CREATED);  
41.     }  

安卓端调用的下载方法(核心代码)如下:

Java代码  

1. /*** 
2.      *  
3.      * @param huc 
4.      * @param sendBytes 
5.      * @param mode 
6.      * @param isWrite2file 
7.      *            : 是否写入文件 
8.      * @return 
9.      * @throws Exception 
10.      */  
11.     private static byte[] connection(HttpURLConnection huc,  
12.             boolean isWrite2file, Object file, String sizeHeadKey)  
13.             throws Exception {  
14.         int resCode = huc.getResponseCode();  
15.   
16.         if (resCode == HttpURLConnection.HTTP_OK) {  
17.             int contentLength = 0;  
18.             if (ValueWidget.isNullOrEmpty(sizeHeadKey)) {// 若header中没有size  
19.                 contentLength = huc.getContentLength();  
20.             } else {  
21.                 String sizeHeaderValue = huc.getHeaderField(sizeHeadKey);  
22.                 if (!ValueWidget.isNullOrEmpty(sizeHeaderValue)) {  
23.                     contentLength = Integer.parseInt(sizeHeaderValue);  
24.                 }  
25.   
26.             }  
27.             if (isDetail) {  
28.                 System.out  
29.                         .println("[connection]contentLength:" + contentLength);  
30.                 responseHeaderFields = huc.getHeaderFields();  
31.                 String downloadHeader = "Content-Disposition";  
32.                 if (!ValueWidget.isNullOrEmpty(responseHeaderFields)) {  
33.                     List<String> ContentDispositions = responseHeaderFields  
34.                             .get(downloadHeader);  
35.                     if (!ValueWidget.isNullOrEmpty(ContentDispositions)) {  
36.                         String ContentDisposition = ContentDispositions.get(0);  
37.                         System.out.println("ContentDisposition:"  
38.                                 + ContentDisposition);  
39.                         System.out.println("ContentDisposition convertISO2UTF:"  
40.                                 + SystemHWUtil  
41.                                         .convertISO2UTF(ContentDisposition));  
42.                         System.out  
43.                                 .println("ContentDisposition convertISO2GBK: "  
44.                                         + SystemHWUtil  
45.                                                 .convertISO2GBK(ContentDisposition));  
46.                     }  
47.                 }  
48.                 for (Object obj : responseHeaderFields.keySet()) {  
49.                     List<String> list = responseHeaderFields.get(obj);  
50.                     if (!ValueWidget.isNullOrEmpty(list)) {  
51.                         System.out.println(obj + " : "  
52.                                 + SystemHWUtil.formatArr(list, ";"));  
53.                     }  
54.                 }  
55.                 System.out  
56.                         .println("[connection]contentLength:" + contentLength);  
57.             }  
58.             if (contentLength > 0) {  
59.                 if (isDetail)  
60.                     System.out  
61.                             .println("[HttpSocketUtil.connection]httputil,contentLength:"  
62.                                     + contentLength);  
63.                 // return readData(huc);  
64.                 File file2 = null;  
65.                 if (isWrite2file) {  
66.                     if (file instanceof File) {  
67.                         file2 = (File) file;  
68.                         writeFileFromLength(huc, contentLength, file2);  
69.                         if (isDetail) {  
70.                             System.out.println("download success:"  
71.                                     + file2.getAbsolutePath());  
72.                         }  
73.                     } else {  
74.                         writeFileFromLength(huc, contentLength,  
75.                                 (OutputStream) file);  
76.                     }  
77.                     return null;  
78.                 } else {  
79.                     return readDataFromLength(huc, contentLength);  
80.                 }  
81.             } else {  
82.                 if (isWrite2file) {  
83.                     InputStream in = huc.getInputStream();  
84.                     FileUtils.writeIn2OutputCloseAll(in, new FileOutputStream(  
85.                             (File) file));  
86.                     if (isDetail) {  
87.                         System.out.println("download success:"  
88.                                 + ((File) file).getAbsolutePath());  
89.                     }  
90.                     return null;  
91.                 }  
92.                 return readData(huc);  
93.             }  
94.         } else {  
95.             System.out.println("response Code:" + resCode);  
96.         }  
97.         return null;  
98.     }  

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