用Java可以做到吗？连接字符串中的主机无法解析，因此在能够在连接上调用getMetaData之前，我在DataSource的getConnection（）中获取了SQLException。

这是我的代码：

DataSource ds = null;
Connection connection = null;
DataSourceProbeRequest request = null;

try {
  request = (DataSourceProbeRequest) probeRequest;

  ds = request.getDataSource();

  connection = ds.getConnection();
  final boolean validConnection = connection != null && connection.isValid(5000);
  if (validConnection) {
    LOGGER.info("Connection is ok: " + request.getTargetId());
    return new ProbeResult(request.getTargetId(), buildDatasourceMsg(connection, true));
  } else {
    return new ProbeResult(request.getTargetId(), new Exception(buildDatasourceMsg(connection, false)));
  }
} catch (Exception exp) {
  return new ProbeResult(request.getTargetId(), exp);
} finally {
  if (connection != null) {
    try {
      connection.close();
    } catch (SQLException e) {
      LOGGER.warn("Failed to close database connection", e);
    }
  }
}

由于主机不可访问，connection = ds.getConnection();将引发异常并导致new ProbeResult(request.getTargetId(), exp)返回。但是，该异常仅具有诸如之类的错误消息IO Error: The Network Adapter could not establish the connection。它没有在连接字符串中给出主机名。我想显示主机名（或连接字符串）以便可以对其进行诊断