Android Volley支持多个cookie

 原创文章，转载请注明出处：http://blog.csdn.net/wj2030/article/details/43731703

       最近在做一个项目，考虑到volley使用比较方便，就将其选择为网络工具。可是在使用途中发现，由于我们的项目在登录验证的时候，返回了多个cookie.也就是返回的头信息中Set-Cookie有多个值，但是volley在onResponse中只能得到一个cookie.刚开始非常郁闷，以至于我又用HttpClient编写了一个测试程序。发现，的确是volley的问题。找到问题就好办了，volley是开源的想怎么修改，就怎么修改。

         关于volley的详解，不了解的可以看看郭神的博客。这里附上郭神的文章地址：http://blog.csdn.net/guolin_blog/article/details/17482095   

         可以知道，在网络通信过程中volley会根据版本号选择使用httpclientStack或则hurlStack。通过查看两者的源代码如下：

HttpClientStack-->

 public HttpResponse performRequest(Request<?> request, Map<String, String> additionalHeaders)
             throws IOException, AuthFailureError {
         HttpUriRequest httpRequest = createHttpRequest(request, additionalHeaders);
         addHeaders(httpRequest, additionalHeaders);
         addHeaders(httpRequest, request.getHeaders());
         onPrepareRequest(httpRequest);
         HttpParams httpParams = httpRequest.getParams();
         int timeoutMs = request.getTimeoutMs();
         // TODO: Reevaluate this connection timeout based on more wide-scale
         // data collection and possibly different for wifi vs. 3G.
         HttpConnectionParams.setConnectionTimeout(httpParams, 5000);
         HttpConnectionParams.setSoTimeout(httpParams, timeoutMs);
         return mClient.execute(httpRequest);
     }

很明显没啥异常。但是HurlStack-->中如下：

 public HttpResponse performRequest(Request<?> request, Map<String, String> additionalHeaders)
 throws IOException, AuthFailureError {
 String url = request.getUrl();
 HashMap<String, String> map = new HashMap<String, String>();
 map.putAll(request.getHeaders());
 map.putAll(additionalHeaders);
 if (mUrlRewriter != null) {
 String rewritten = mUrlRewriter.rewriteUrl(url);
 if (rewritten == null) {
 throw new IOException("URL blocked by rewriter: " + url);
 }
 url = rewritten;
 }
 URL parsedUrl = new URL(url);
 HttpURLConnection connection = openConnection(parsedUrl, request);
 for (String headerName : map.keySet()) {
 connection.addRequestProperty(headerName, map.get(headerName));
 }
 setConnectionParametersForRequest(connection, request);
 // Initialize HttpResponse with data from the HttpURLConnection.
 ProtocolVersion protocolVersion = new ProtocolVersion("HTTP", 1, 1);
 int responseCode = connection.getResponseCode();
 if (responseCode == -1) {
 // -1 is returned by getResponseCode() if the response code could not be retrieved.
 // Signal to the caller that something was wrong with the connection.
 throw new IOException("Could not retrieve response code from HttpUrlConnection.");
 }
 StatusLine responseStatus = new BasicStatusLine(protocolVersion,
 connection.getResponseCode(), connection.getResponseMessage());
 BasicHttpResponse response = new BasicHttpResponse(responseStatus);
 response.setEntity(entityFromConnection(connection));
 for (Entry<String, List<String>> header : connection.getHeaderFields().entrySet()) {
 if (header.getKey() != null) {
 Header h = new BasicHeader(header.getKey(), header.getValue().get(0));                    // 这里发现一个问题
 response.addHeader(h);
 }
 }
 return response;
 }

如上注释，我们可以看到，在hurlStack中，添加到response中的header只是每一中头信息的第一项，也就是导致我Set-Cookie最后只有第一个cookie后面的都没有了。既然发现里问题，那就修改，只需要修改一点，我的修改如下：

 for (Entry<String, List<String>> header : connection.getHeaderFields().entrySet()) {
             if (header.getKey() != null) {
                 StringBuffer sb = new StringBuffer();
                 for(int i=0;i<header.getValue().size();i++){
                     sb.append(header.getValue().get(i));
                     sb.append("\n");
                 }
                 Header h = new BasicHeader(header.getKey(),sb.toString());
                 //Header h = new BasicHeader(header.getKey(), header.getValue().get(0));
                 response.addHeader(h);
             }
         }

这样返回的response中的头信息就全部在里，只是每一个cookie之间添加里一个回车而已。下面贴上我打包生存的.arr文件。方便各位使用。