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Accepted
chris01
Asked: 2024-07-05 17:55:34 +0800 CST

没有 ConnectionException 的异常消息字符串

  • 772

ConnectionException 没有消息文本是正常的吗？消息通常允许为空吗？

使用OpenJDK17和OpenJDK11。

try
{
    HttpRequest httpreq = HttpRequest.newBuilder ().uri (URI.create ("http://blabla.blabla.blabla")).build ();
    HttpClient httpclnt = HttpClient.newBuilder ().build ();
    HttpResponse <String> httpresp = httpclnt.send (httpreq, HttpResponse.BodyHandlers.ofString ());
}
catch (Exception e)
{
    System.out.println ("EXCEPTION: " + e + "   -    " + e.getMessage ());
}

输出为

EXCEPTION: java.net.ConnectException   -    null
java

1 个回答

  1. Best Answer

    是的，ConnectionException 没有消息文本，因为异常本身是不言自明的

    您可以尝试在代码中处理空值：

    try {
    HttpRequest httpreq = HttpRequest.newBuilder().uri(URI.create("http://blabla.blabla.blabla")).build();
    HttpClient httpclnt = HttpClient.newBuilder().build();
    HttpResponse<String> httpresp = httpclnt.send(httpreq, HttpResponse.BodyHandlers.ofString());
} catch (Exception e) {
    String message = e.getMessage();
    if (message == null) {
        message = "No message available";
    }
    System.out.println("EXCEPTION: " + e + "   -    " + message);
}
    • 1

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