Android:SocketTimeoutException: 30000 毫秒后无法连接到/103.24.4.60(端口 80)

Question

我想从 Http url 下载图像并在加载并显示到 ImageView 后保存到 SD 卡中。我试过 android-hive 的图像加载器教程，使用我的 http url 加载图像，但运行图像后无法加载和显示。应用程序未崩溃，但在 ImageLoader 类中出现错误异常 java.net.SocketTimeoutException:30000 毫秒后无法连接到/103.24.4.60(端口 80)

这是我的日志信息

09-30 02:32:15.820  18371-18389/? W/System.err﹕ java.net.SocketTimeoutException: failed to connect to /103.24.4.60 (port 80) after 30000ms
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at libcore.io.IoBridge.connectErrno(IoBridge.java:169)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at libcore.io.IoBridge.connect(IoBridge.java:122)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at java.net.Socket.connect(Socket.java:882)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at com.android.okhttp.internal.Platform.connectSocket(Platform.java:139)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at com.android.okhttp.Connection.connect(Connection.java:148)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:276)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:373)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:323)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:190)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at com.example.tazeen.imgloader.ImageLoader.getBitmap(ImageLoader.java:73)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at com.example.tazeen.imgloader.ImageLoader.access$000(ImageLoader.java:23)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at com.example.tazeen.imgloader.ImageLoader$PhotosLoader.run(ImageLoader.java:134)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
09-30 02:32:15.820  18371-18389/? W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:237)
09-30 02:32:15.821  18371-18389/? W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
09-30 02:32:15.821  18371-18389/? W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
09-30 02:32:15.821  18371-18389/? W/System.err﹕ at java.lang.Thread.run(Thread.java:818)

这是 ImageLoader 类

public class ImageLoader {

    MemoryCache memoryCache=new MemoryCache();
    FileCache fileCache;
    private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
    ExecutorService executorService; 

    public ImageLoader(Context context){
        fileCache=new FileCache(context);
        executorService=Executors.newFixedThreadPool(5);
    }

    int stub_id = R.drawable.ic_launcher;
    public void DisplayImage(String url, int loader, ImageView imageView)
    {
        stub_id = loader;
        imageViews.put(imageView, url);
        Bitmap bitmap=memoryCache.get(url);
        if(bitmap!=null)
            imageView.setImageBitmap(bitmap);
        else
        {
            queuePhoto(url, imageView);
            imageView.setImageResource(loader);
        }
    }

    private void queuePhoto(String url, ImageView imageView)
    {
        PhotoToLoad p=new PhotoToLoad(url, imageView);
        executorService.submit(new PhotosLoader(p));
    }

    private Bitmap getBitmap(String url)
    {
        File f=fileCache.getFile(url);

        //from SD cache
        Bitmap b = decodeFile(f);
        if(b!=null)
            return b;

        //from web
        try {
            Bitmap bitmap=null;
            URL imageUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
            conn.setConnectTimeout(30000);
            conn.setReadTimeout(30000);
            conn.setInstanceFollowRedirects(true);
            InputStream is=conn.getInputStream();
            OutputStream os = new FileOutputStream(f);
            Utils.CopyStream(is, os);
            os.close();
            bitmap = decodeFile(f);
            return bitmap;
        } catch (Exception ex){
           ex.printStackTrace();
           return null;
        }
    }

    //decodes image and scales it to reduce memory consumption
    private Bitmap decodeFile(File f){
        try {
            //decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(new FileInputStream(f),null,o);

            //Find the correct scale value. It should be the power of 2.
            final int REQUIRED_SIZE=70;
            int width_tmp=o.outWidth, height_tmp=o.outHeight;
            int scale=1;
            while(true){
                if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
                    break;
                width_tmp/=2;
                height_tmp/=2;
                scale*=2;
            }

            //decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize=scale;
            return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
        } catch (FileNotFoundException e) {}
        return null;
    }

    //Task for the queue
    private class PhotoToLoad
    {
        public String url;
        public ImageView imageView;
        public PhotoToLoad(String u, ImageView i){
            url=u;
            imageView=i;
        }
    }

    class PhotosLoader implements Runnable {
        PhotoToLoad photoToLoad;
        PhotosLoader(PhotoToLoad photoToLoad){
            this.photoToLoad=photoToLoad;
        }

        @Override
        public void run() {
            if(imageViewReused(photoToLoad))
                return;
            Bitmap bmp=getBitmap(photoToLoad.url);
            memoryCache.put(photoToLoad.url, bmp);
            if(imageViewReused(photoToLoad))
                return;
            BitmapDisplayer bd=new BitmapDisplayer(bmp, photoToLoad);
            Activity a=(Activity)photoToLoad.imageView.getContext();
            a.runOnUiThread(bd);
        }
    }

    boolean imageViewReused(PhotoToLoad photoToLoad){
        String tag=imageViews.get(photoToLoad.imageView);
        if(tag==null || !tag.equals(photoToLoad.url))
            return true;
        return false;
    }

    //Used to display bitmap in the UI thread
    class BitmapDisplayer implements Runnable
    {
        Bitmap bitmap;
        PhotoToLoad photoToLoad;
        public BitmapDisplayer(Bitmap b, PhotoToLoad p){bitmap=b;photoToLoad=p;}
        public void run()
        {
            if(imageViewReused(photoToLoad))
                return;
            if(bitmap!=null)
                photoToLoad.imageView.setImageBitmap(bitmap);
            else
                photoToLoad.imageView.setImageResource(stub_id);
        }
    }

    public void clearCache() {
        memoryCache.clear();
        fileCache.clear();
    }

}

Answer 1

有两种可能:

1) 您是否检查并测试了您的连接。

2) 最好不要设置任何连接超时，如果你正在设置选择最长时间，因为如果服务器在给定时间内没有响应，它会抛出错误。

所以你可以使用:

HttpUrlConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(7000);

或者你可以使用:

for (int retries = 0; retries < 3; retries++) {
    try {
        final HttpClient client = createHttpClientWithDefaultSocketFactory(null, null);
        final HttpResponse response = client.execute(get);
        final int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode != 200) {
            throw new IllegalStateException("GET Request on '" + get.getURI().toString() + "' resulted in " + statusCode);
        } else {                
            return response.getEntity();
        }
    } catch (final java.net.SocketTimeoutException e) {
    // connection timed out...let's try again                
   }
}

希望对你有帮助，享受你的代码:)