java - Android 手机上到 Rails 服务器的基本 HTTP 身份验证

Question

我正在尝试连接到需要身份验证的 Rails 应用程序服务器。我在桌面应用程序上使用 Jakarta HTTP Client for Java，它可以 100% 运行。但是当在 Android Emulator 上执行完全相同的代码时，我得到一个 IOException。

这是代码，如果有人能帮我弄清楚它抛出 IOException 的原因，我将不胜感激!

private boolean login()
{
    String username, password;

    DefaultHttpClient client;
    AuthScope scope;
    Credentials myCredentials;
    CredentialsProvider provider;
    HttpEntity entity;
    String line;
    BufferedReader reader;
    InputStream instream;

    //Declare & Create the HTTP Client  
    client = new DefaultHttpClient();

    //Create our AuthScope
    scope = new AuthScope("10.19.9.33", 3000);

    username = "admin"
            password = "pass"


    //Set Credentials
    myCredentials = new UsernamePasswordCredentials( username, password );

    //Set Provider
    provider = new BasicCredentialsProvider();
    provider.setCredentials(scope, myCredentials);

    //Set Credentials
    client.setCredentialsProvider( provider );

    String url = "http://10.19.9.33:3000/users/show/2";

    HttpGet get;

    //Tell where to get
    get = new HttpGet( url );

    HttpResponse response;

    try
    {
        response = client.execute( get );

        entity = response.getEntity();

        /* Check to see if it exists */
        if( entity != null )
        {
            instream = entity.getContent();

            try {

                reader = new BufferedReader(new InputStreamReader(instream));

                line = reader.readLine();

                if( line.equals( "HTTP Basic: Access denied.") )
                    return false;

                while ( line != null )
                {
                    // do something useful with the response
                    System.out.println(line);

                    line = reader.readLine();
                }

                return true;

            } 
            catch (IOException ex)
            {

                // In case of an IOException the connection will be released
                // back to the connection manager automatically
                throw ex;

            } 
            catch (RuntimeException ex)
            {
                // In case of an unexpected exception you may want to abort
                // the HTTP request in order to shut down the underlying 
                // connection and release it back to the connection manager.
                get.abort();
                throw ex;               
            } 
            finally
            {
                // Closing the input stream will trigger connection release
                instream.close();               
            }
        }
    }
    catch( ClientProtocolException cp_ex )
    {

    }
    catch( IOException io_ex )
    {

    }

    return false;
}

Answer 1

它一直触发 IOException 的原因是因为 Manifest 文件没有给应用程序访问互联网的权限

<uses-permission android:name="android.permission.INTERNET"></uses-permission>