CODEWITHSUNDEEP
java
Belphegor21
Belphegor21

Reputation: 484

Java detect connection errors

I have some Java code which reads a gzip file from an URL and decompress it. How do I make sure that the whole file is read from the connection or how do I make sure that there are no problem with it? 

try {
    URL url = new URL("http://example.com/de?Debug=1");
    URLConnection myUrlConnection = url.openConnection();
    GZIPInputStream gZIPInputStream = new GZIPInputStream(myUrlConnection.getInputStream());
    StringBuffer decompressedStringBuffer = new StringBuffer();
    int bytes_read;
    while ((bytes_read = gZIPInputStream.read(buffer)) > 0) {
        String part = new String(buffer, 0 ,bytes_read, "UTF-8");
            decompressedStringBuffer.append(part);
        }
        gZIPInputStream.close();
        String decompressedString = decompressedStringBuffer.toString();

        ...

} catch (MalformedURLException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

The try-catch block are auto-generated by IntelliJ. What other types of exceptions should I catch to cover : connection break, partial data received, connection timeout. These are all the problems I could think of. Can you think of others?

Upvotes: 0

Views: 69

Answers (1)

user207421
user207421

Reputation: 310985

If you get to the point where read() returns -1 you have the entire file that was sent.

But don't collect it in memory: do something useful with it each time you get a piece: i.e. send it on, or write it to a file, or whatever.

You don't need to catch any more exceptions, and any IOExceptions indicate trouble of one kind or another.

Upvotes: 3

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