当我使用 GZIPInputStream 压缩从 Internet 获取的字节时,程序运行错误如下:
05-08 17:37:02.465: W/System.err(744): java.io.IOException: unknown format (magic number 213c)
05-08 17:37:02.465: W/System.err(744): at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:84)
05-08 17:37:02.465: W/System.err(744): at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:64)
05-08 17:37:02.475: W/System.err(744): at com.Android.Sample.TestActivity.onCreate(TestActivity.java:54)
05-08 17:37:02.475: W/System.err(744): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-08 17:37:02.475: W/System.err(744): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
05-08 17:37:02.475: W/System.err(744): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
05-08 17:37:02.475: W/System.err(744): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
05-08 17:37:02.475: W/System.err(744): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
05-08 17:37:02.475: W/System.err(744): at android.os.Handler.dispatchMessage(Handler.java:99)
05-08 17:37:02.475: W/System.err(744): at android.os.Looper.loop(Looper.java:123)
05-08 17:37:02.475: W/System.err(744): at android.app.ActivityThread.main(ActivityThread.java:3683)
05-08 17:37:02.475: W/System.err(744): at java.lang.reflect.Method.invokeNative(Native Method)
05-08 17:37:02.475: W/System.err(744): at java.lang.reflect.Method.invoke(Method.java:507)
05-08 17:37:02.475: W/System.err(744): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-08 17:37:02.475: W/System.err(744): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-08 17:37:02.486: W/System.err(744): at dalvik.system.NativeStart.main(Native Method)
我的代码如下:
HttpGet request = new HttpGet("http://www.google.com");
HttpResponse response = new DefaultHttpClient().execute(request);
HttpEntity entity = response.getEntity();
InputStream stream = entity.getContent();
InputStream zippedStream = new GZIPInputStream(stream);
InputStreamReader reader = new InputStreamReader(zippedStream);
BufferedReader buffer = new BufferedReader(reader);
如果我只是使用
InputStreamReader reader = new InputStreamReader(stream);
不要压缩流,就可以了。
最佳答案
您必须在接收输入流之前检查 内容编码 。如果响应以 GZIP 编码,请使用 GZIPInputStream 。这是我的解决方案,我在我的 API call 中使用。
InputStream responseStream = null;
...
// receive response
String encoding = connection.getHeaderField("Content-Encoding");
boolean gzipped = encoding!=null && encoding.toLowerCase().contains("gzip");
try
{
InputStream inputStream = connection.getInputStream();
if(gzipped) responseStream = new BufferedInputStream(new GZIPInputStream(inputStream));
else responseStream = new BufferedInputStream(inputStream);
}
catch(FileNotFoundException e)
{
// error stream
InputStream errorStream = connection.getErrorStream();
if(gzipped) responseStream = new BufferedInputStream(new GZIPInputStream(errorStream));
else responseStream = new BufferedInputStream(errorStream);
}
...
// TODO: close stream