Android - 终结器抛出未捕获的异常

Question

我有这段代码，它接受服务器响应并将其写入文件。

该文件包含 json 数据。我将响应写入文件，以便按顺序扫描 json 并避免在 List 中加载大 json 数据！

我认为这个方法抛出了异常，但我不确定！

public File getData(final String url) throws URISyntaxException, AuthenticationException, IOException, ClientProtocolException, HttpResponseException {
    final HttpGet getRequest = new HttpGet(new URI(url));

    final UsernamePasswordCredentials creds = new UsernamePasswordCredentials(username, password);
    getRequest.addHeader(new BasicScheme().authenticate(creds, getRequest));
    getRequest.setHeader("Content-Type", "application/json");
    final ResponseHandler<byte[]> responseHandler = new ByteArrayResponseHandler();
    final byte[] responseBody = mClient.execute(getRequest, responseHandler);

    final File output = new File(FileConfig.TEMP_PATH + System.currentTimeMillis()+".json");
    final FileOutputStream fos = new FileOutputStream(output.getPath()); 

    fos.write(responseBody);
    fos.close();
    return output;
}

但我注意到最近（我不知道为什么）我得到了这个异常：

01-22 07:45:51.809: E/System(9055): Uncaught exception thrown by finalizer
01-22 07:45:51.833: E/System(9055): java.io.IOException: close failed: EIO (I/O error)
01-22 07:45:51.833: E/System(9055):     at libcore.io.IoUtils.close(IoUtils.java:41)
01-22 07:45:51.833: E/System(9055):     at java.io.FileInputStream.close(FileInputStream.java:121)
01-22 07:45:51.833: E/System(9055):     at java.io.FileInputStream.finalize(FileInputStream.java:142)
01-22 07:45:51.833: E/System(9055):     at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:185)
01-22 07:45:51.833: E/System(9055):     at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:168)
01-22 07:45:51.833: E/System(9055):     at java.lang.Thread.run(Thread.java:856)
01-22 07:45:51.833: E/System(9055): Caused by: libcore.io.ErrnoException: close failed: EIO (I/O error)
01-22 07:45:51.833: E/System(9055):     at libcore.io.Posix.close(Native Method)
01-22 07:45:51.833: E/System(9055):     at libcore.io.BlockGuardOs.close(BlockGuardOs.java:75)
01-22 07:45:51.833: E/System(9055):     at libcore.io.IoUtils.close(IoUtils.java:38)
01-22 07:45:51.833: E/System(9055):     ... 5 more
01-22 07:45:51.833: E/System(9055): Uncaught exception thrown by finalizer
01-22 07:45:51.841: E/System(9055): java.io.IOException: close failed: EIO (I/O error)
01-22 07:45:51.841: E/System(9055):     at libcore.io.IoUtils.close(IoUtils.java:41)
01-22 07:45:51.841: E/System(9055):     at java.io.FileInputStream.close(FileInputStream.java:121)
01-22 07:45:51.841: E/System(9055):     at java.io.FileInputStream.finalize(FileInputStream.java:142)
01-22 07:45:51.841: E/System(9055):     at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:185)
01-22 07:45:51.841: E/System(9055):     at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:168)
01-22 07:45:51.841: E/System(9055):     at java.lang.Thread.run(Thread.java:856)
01-22 07:45:51.841: E/System(9055): Caused by: libcore.io.ErrnoException: close failed: EIO (I/O error)
01-22 07:45:51.841: E/System(9055):     at libcore.io.Posix.close(Native Method)
01-22 07:45:51.841: E/System(9055):     at libcore.io.BlockGuardOs.close(BlockGuardOs.java:75)
01-22 07:45:51.841: E/System(9055):     at libcore.io.IoUtils.close(IoUtils.java:38)
01-22 07:45:51.841: E/System(9055):     ... 5 more

似乎一切正常，但我对这个异常感到困惑。

targetSdk ok 我的应用是 13。

感谢您的任何评论/回复！

Answer 1

像这样更新你的代码。

 public File getData(final String url) throws URISyntaxException, AuthenticationException, IOException, ClientProtocolException, HttpResponseException {
    FileOutputStream fos = null;
    File output = null;

    final HttpGet getRequest = new HttpGet(new URI(url));

    final UsernamePasswordCredentials creds = new UsernamePasswordCredentials(
            username, password);
    getRequest.addHeader(new BasicScheme().authenticate(creds, getRequest));
    getRequest.setHeader("Content-Type", "application/json");
    final ResponseHandler<byte[]> responseHandler = new ByteArrayResponseHandler();
    final byte[] responseBody = mClient
            .execute(getRequest, responseHandler);

    try {
        output = new File(FileConfig.TEMP_PATH + System.currentTimeMillis()
                + ".json");
        fos = new FileOutputStream(output.getPath());

        fos.write(responseBody);

        fos.flush();
        fos.close();

    } catch (FileNotFoundException e) {

    } catch (IOException e) {

    } catch (Exception e) {

    } finally {
        if (fos != null) {
            fos = null;
        }
    }
    return output;
 }

因为当您尝试 fos.wrire() 或 fos.close() 时，它可能会通过 IOException 并且当您调用 new FileOutputStream(output.getPath());它可能通过 FileNotFoundException。