Question

我正在使用SaxParser来解析从（OAI）服务器收到的xml。这个xml可以从我生成另一个请求到服务器以获取另一个xml，依此类推。

某些服务器可以将这些后续请求理解为拒绝服务攻击并返回“HTTP响应代码：503”。

如何捕获响应代码？

以下是我正在使用的代码：

try
    {
        InputSource is = new InputSource( uri );
        is.setEncoding( "UTF-8" );
        parser.parse( is, handler );
        parsed = true;
    }
    catch ( IOException ioException )
    {
        ...here should happen the response code handling...

        persistError( "Error(IOException) in parsing: " + ioException.getMessage() );
    }
    catch ( SAXException saxException )
    {
        persistError( "Error(SAXException) in parsing: " + saxException.getMessage() );
        // we do not retry to parse if the error is a parsing error
        retry = RETRY_FETCH_URL + 1;
    }

Answer 1

在调用解析器之前，您始终可以检查响应代码。例如：

HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
final int responseCode = connection.getResponseCode();
if (responseCode < 200 || responseCode > 299) {
    log.info("Response " + responseCode + " opening connection to " + url);
    return;
}
try (Reader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"))) {
    InputSource is = new InputSource(reader);
    is.setEncoding( "UTF-8" );
    parser.parse(is, handler);
}

如何使用SaxParser.parse捕获（http）响应代码

1 个答案: