java - C2DM，发送消息时出现IOException

Question

我无法让 C2DM 的发送部分工作。我在 OutputStream 得到 IOException out = conn.getOutputStream();

public void sendMessage() throws IOException{       
                String key = readFileAsString("acct/"+to+"/key");

                StringBuilder postDataBuilder = new StringBuilder();
                postDataBuilder.append("registration_id").append("=").append(key);
                postDataBuilder.append("&").append("collapse_key").append("=").append("0");
                postDataBuilder.append("&").append("data.payload").append("=").append(URLEncoder.encode(to+"--"+"acct/"+to+"/1", UTF8));
                byte[] postData = postDataBuilder.toString().getBytes(UTF8);

                URL url = new URL("https://android.apis.google.com/c2dm/send");

                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setDoOutput(true);
                conn.setUseCaches(false);
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                conn.setRequestProperty("Content-Length", Integer.toString(postData.length));                   
                conn.setRequestProperty("Authorization", "GoogleLogin auth=" + cl);

             //------------------
                OutputStream out = conn.getOutputStream();
             //--------------------------
                out.write(postData);
                out.close();

                int sw =conn.getResponseCode();
                System.out.println(""+sw);
                switch (sw) {
                    case 200:
                        System.out.println("Success, but check for errors in the body");
                        break;
                    case 503:
                        System.out.println("Service unavailable");
                        break;
                    case 401:
                        System.out.println(" Invalid authentication token");
                        break;
                 }

            }

谢谢!

Answer 1

最常用于解决您收到的错误消息的解决方案是定义自定义主机名验证。您面临的主要问题是 Google 的 Android URL 返回的域名是 *.google.com。不幸的是，这会导致一些问题，因为 Android SDK 位于 android.apis.google.com。默认情况下，JVM 不会验证此组合(*.sdk.google.com 是可以接受的)。

这是一个如何创建自己的主机名 validator 的示例:

    URL url = new URL("https://android.apis.google.com/c2dm/send");

    HostnameVerifier hVerifier = new HostnameVerifier() {
        public boolean verify(String hostname, SSLSession
                session) {
            return true;
        }
    };

    HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
    conn.setHostnameVerifier(hVerifier);

如果您将代码更改为与上述类似的内容，则您提到的错误应该得到更正。

编辑
这是一些在我的开发环境中功能齐全的测试代码。只需使用您的应用程序特定信息更新身份验证信息即可运行:

public class C2DMTest {


    public static void main(String... args) throws Exception {
        String auth = authorize();
        if (auth == null) {
            System.out.println("No authorization returned");
            System.exit(1);
        }
        sendMessage(auth);
    }

    /**
     * Perform an authorization request to access Google's C2DM
     * API.
     *
     * @return The retrieved authorization request.
     */
    private static String authorize() throws Exception {
        String accountType = "GOOGLE";
        String service = "ac2dm";

        String source = "replace-me";
        String email = "replace-me";
        String passwd = "replace-me";


        StringBuilder params = new StringBuilder();
        params.append("accountType=").append(accountType)
                .append("&Email=").append(URLEncoder.encode(email, UTF8))
                .append("&Passwd=").append(URLEncoder.encode(passwd, UTF8))
                .append("&service=").append(service)
                .append("&source=").append(source);
        byte[] postData = params.toString().getBytes(UTF8);

        URL url = new URL("https://www.google.com/accounts/ClientLogin");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        conn.setRequestProperty("Content-Length", Integer.toString(postData.length));

        //------------------
        OutputStream out = conn.getOutputStream();
        //--------------------------
        out.write(postData);
        out.close();

        int sw = conn.getResponseCode();
        System.out.println("" + sw);

        switch (sw) {
            case 503:
                System.out.println("Service unavailable");
                break;
            case 401:
                System.out.println(" Invalid authentication token");
                break;
            default:
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                InputStream in = conn.getInputStream();
                byte[] bytes = new byte[100];
                int len = -1;
                while ((len = in.read(bytes)) != -1) {
                    baos.write(bytes, 0, len);
                }
                in.close();
                String input = baos.toString();
                Map<String, String> res = parseResponse(input);
                return res.get("Auth");
        }
        return null;
    }

    /**
     * Parses a response string into a usable data map.
     *
     * @param response The response from Google
     * @return A Map representation.
     */
    private static Map<String, String> parseResponse(String response) {
        Map<String, String> map = new HashMap<String, String>();
        if (response != null) {
            String[] lines = response.split("\n");
            for (String line : lines) {
                String[] parts = line.split("=");
                if (parts.length == 2) {
                    map.put(parts[0], parts[1]);
                }
            }
        }
        return map;
    }

    private static String UTF8 = "UTF-8";


    /**
     * Send message to mobile device.
     *
     * @param cl Google API auth code.
     */
    public static void sendMessage(String cl) throws IOException {
        String key = "invalid";

        StringBuilder postDataBuilder = new StringBuilder();
        postDataBuilder.append("registration_id").append("=").append(key);
        postDataBuilder.append("&").append("collapse_key").append("=").append("0");
        postDataBuilder.append("&").append("data.payload").append("=").append(URLEncoder.encode("test-content", UTF8));
        byte[] postData = postDataBuilder.toString().getBytes(UTF8);

        URL url = new URL("https://android.apis.google.com/c2dm/send");

        HostnameVerifier hVerifier = new HostnameVerifier() {
            public boolean verify(String hostname, SSLSession
                    session) {
                return true;
            }
        };

        HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
        conn.setHostnameVerifier(hVerifier);
        conn.setDoOutput(true);
        conn.setUseCaches(false);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        conn.setRequestProperty("Content-Length", Integer.toString(postData.length));
        conn.setRequestProperty("Authorization", "GoogleLogin auth="+cl);

        //------------------
        OutputStream out = conn.getOutputStream();
        //--------------------------
        out.write(postData);
        out.close();

        int sw = conn.getResponseCode();
        System.out.println("" + sw);
        switch (sw) {
            case 200:
                System.out.println("Success, but check for errors in the body");
                break;
            case 503:
                System.out.println("Service unavailable");
                break;
            case 401:
                System.out.println(" Invalid authentication token");
                break;
        }

    }
}