java.net.UnknownHostException for bucketname.s3.amazonaws.com

我正在使用下面的代码来下载s3。此代码来自我的Android应用。java.net.UnknownHostException for bucketname.s3.amazonaws.com

public void downloadFile(String baseDir, String imageName) throws IOException { 
    this.s3Client = new AmazonS3Client(new BasicAWSCredentials(accessKey,secretKey)); 

    String s3key = baseDir + "/" + imageName ; 

    Log.d(tag, "downloading S3 file with key = " + s3key); 

    S3ObjectInputStream content = null; 
    try { 
     content = s3Client.getObject(bucketName,s3key).getObjectContent(); 
    } catch(RuntimeException ex) { 
     Log.e(tag, "error while downloding S3 file with key = " + s3key ,ex); 
     throw new IOException(ex); 
    }

当我执行这个代码，我得到以下异常：当我火的URL

02-28 00:48:53.589: D/s3dao(4078): downloading S3 file with key = level1/2_3.jpg 
02-28 00:48:54.800: I/AmazonHttpClient(4078): Unable to execute HTTP request: fourpicstest.s3.amazonaws.com 
02-28 00:48:54.800: I/AmazonHttpClient(4078): java.net.UnknownHostException: fourpicstest.s3.amazonaws.com 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at java.net.InetAddress.lookupHostByName(InetAddress.java:512) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:300) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at java.net.InetAddress.getAllByName(InetAddress.java:259) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:278) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:162) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:645) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:480) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:377) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:228) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3215) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.services.s3.AmazonS3Client.getObject(AmazonS3Client.java:1038) 
02-28 00:48:54.800: I/AmazonHttpClient(4078): at com.amazonaws.services.s3.AmazonS3Client.getObject(AmazonS3Client.java:920)

然而，：fourpicstest.s3.amazonaws.com，我得到 “拒绝访问异常”

bucket fourpicstest确实存在。

来源

2014-02-27 user93796

你尝试过这个问题吗？ http://stackoverflow.com/questions/9723169/unknown-host-exception-from-the-aws-java-client – nikis

@KEYSER，你可能是一个很好的SO编辑器，并自己修复它，然后提醒OP，良好的格式和语法是重要的:) – Melquiades

@Melquiades我做了什么。我不明白它是如何被调用的。这不完全是我的责任。 – keyser

解决它自己：Internet权限失踪清单文件

添加以下内容清单文件解决

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

来源

2014-02-28 09:50:05 user93796

java.net.UnknownHostException for bucketname.s3.amazonaws.com

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