Question

我使用Java 6将XML数据发送到服务器。

XMLWriter类的Method writeToURL使用URLConnection将XML数据发送到我的Web服务。 XML已成功传输并存储在数据库中，但不是接收下面提到的响应，而是仅获取null。也没有例外。

结果应该有以下XML或包含它的InputStream：

<?xml version="1.0" encoding="UTF-8"?>
<message>
    <type>response</type>
    <messageID>k17436fxOD3y1ywhCX48</messageID>
    <status>successful</status>
</message>

或

<?xml version="1.0" encoding="UTF-8"?>
<message>
    <type>response</type>
    <messageID>k17436fxOD3y1ywhCX48</messageID>
    <status>alreadyExisting</status>
</message>

可以找到完整的XML类代码here 网络服务在此网址上运行：http://wafriv.de/tatoo_webservice/index.php
可以在http://paste.geekosphere.org/p5bf

上找到要发送到Web服务的XML示例

任何帮助都将不胜感激。

[编辑]
我遇到问题的代码是来自XMLWriter的方法writeToURL 这是：

try
{
    URL url = new URL(urlString);
    URLConnection connection = url.openConnection();
    connection.setUseCaches(false);
    connection.setDoOutput(true);
    connection.setRequestProperty("accept-charset", charset);
    connection.setRequestProperty("content-type", "application/x-www-form-urlencoded");
    String query = "";

    if (additionalParams != null)
    {
        for (Map.Entry<String, Object> entry : additionalParams.entrySet()) {
            String key = entry.getKey();
            Object value = entry.getValue();
            query += String.format("%s=%s&", URLEncoder.encode(key, charset), URLEncoder.encode(value.toString(), charset));
        }
    }

    TransformerFactory transFactory = TransformerFactory.newInstance();
    Transformer transformer = transFactory.newTransformer();
    DOMSource source = new DOMSource(this.document);
    StringWriter sw = new StringWriter();
    StreamResult result = new StreamResult(sw);
    transformer.transform(source, result);

    query += String.format("%s=%s", URLEncoder.encode("message", charset), URLEncoder.encode(sw.toString(), charset));

    OutputStreamWriter writer = null;
    InputStream response;
    try
    {
        writer = new OutputStreamWriter(connection.getOutputStream(), charset);
        writer.write(query); // Write POST query string (if any needed).
    }
    finally
    {
        if (writer != null)
        {
            try
            {
                writer.close();
            }
            catch (IOException ex)
            {
                this.exceptionList.add(ex);
            }
        }
    }

    response = connection.getInputStream();

    return response;
}
catch (TransformerConfigurationException ex)
{
    this.exceptionList.add(ex);
}
catch (TransformerException ex)
{
    this.exceptionList.add(ex);
}
catch (MalformedURLException ex)
{
    this.exceptionList.add(ex);
}
catch (IOException ex)
{
    this.exceptionList.add(ex);
}
    catch (Exception ex)
{
    this.exceptionList.add(ex);
}
finally
{
    this.printExceptions();
    return null;
}

Answer 1

问题解决了。 finally导致方法writeToURL返回null。

URLConnection.getInputStream返回null

1 个答案: