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我正在尝试从 Web 服务获取 json 字符串。我已成功登录并在我的 sharepreference 中保存了一个 cookie。然后将 cookie 传递给带有 url/路径的 getMyAdverts 方法以检索 json 数据。这是我的方法。

public static String getMyAdverts( String path, String cookie) throws ClientProtocolException, IOException, JSONException{

    String link =path;
    System.out.println(link);
    String responseBody = null;

    HttpGet httpget = new HttpGet(path);

    System.out.println("cookie "+cookie);
    httpget.addHeader("Cookie", cookie);


    System.out.println("executing request " + httpget.getURI());

    // Pass local context as a parameter
    HttpResponse response = httpclient.execute(httpget);

    System.out.println("response: "+response);

    HttpEntity entity = response.getEntity();

    if(entity != null) {
         responseBody = EntityUtils.toString(entity);
        System.out.println(responseBody);
    }

我的问题是我没有得到任何回应。我是否正确传递了 cookie 或者我错过了一步。这是我的日志。

11-14 11:15:05.246: W/System.err(24636): java.lang.NullPointerException
11-14 11:15:05.246: W/System.err(24636):    at application.util.Utils.getMyAdverts(Utils.java:352)
11-14 11:15:05.246: W/System.err(24636):    at application.app.applicationMenu$loadingTask.doInBackground(applicationMenu.java:478)
11-14 11:15:05.253: W/System.err(24636):    at application.app.applicationMenu$loadingTask.doInBackground(applicationMenu.java:1)
11-14 11:15:05.253: W/System.err(24636):    at android.os.AsyncTask$2.call(AsyncTask.java:264)
11-14 11:15:05.253: W/System.err(24636):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
11-14 11:15:05.253: W/System.err(24636):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
11-14 11:15:05.253: V/SlidingMenu(24636): changing layerType. hardware? true
11-14 11:15:05.253: W/System.err(24636):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
11-14 11:15:05.253: W/System.err(24636):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
11-14 11:15:05.253: W/System.err(24636):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
11-14 11:15:05.253: W/System.err(24636):    at java.lang.Thread.run(Thread.java:856)

更新：方法 2：COOKIE 已过期，但 COOKIE 应在 11 月 16 日星期六过期 

public static void cookieSession(String url, String cookie) throws ClientProtocolException, IOException{
            String responseBody = null;
            CookieStore cookieStore = new BasicCookieStore();
            BasicClientCookie stdCookie = new BasicClientCookie("Cookie",cookie);
            cookieStore.addCookie(stdCookie);
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpContext localContext = new BasicHttpContext();
            localContext.setAttribute(ClientContext.COOKIE_STORE,
                    cookieStore);

            HttpGet httpGet = new HttpGet(url);
            httpGet.addHeader("Cookie", cookie);
            HttpResponse response = httpClient.execute(httpGet, localContext); 

            HttpEntity entity = response.getEntity();
            if(entity != null) {
                 responseBody = EntityUtils.toString(entity);
                System.out.println(responseBody);
            }

        }
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