Question

我正在尝试下载给定网址的网页。但有时我会收到403错误（禁止）或404错误。我想处理所有这些情况并获取HTML。即使它是404我想读取HTML内容。我试图在这里处理cookie，但如何解决各种错误代码？

    URL obj = new URL(url);
    HttpURLConnection c = (HttpURLConnection) obj.openConnection();

    c.setRequestMethod("GET");

    c.setRequestProperty("User-Agent", "Mozilla/5.0");

    int responseCode = c.getResponseCode();

    BufferedReader in = new BufferedReader(
            new InputStreamReader(c.getInputStream()));
    String inputLine;
    StringBuffer response = new StringBuffer();

    while ((inputLine = in.readLine()) != null) {
        response.append(inputLine);
    }
    in.close();

Answer 1

如果您希望/需要单独响应每个可能的 responseCode ，那么在关闭InputStream后，您可以尝试以下方法：

switch(responseCode)
{
  case HttpURLConnection.HTTP_FORBIDDEN:
  {
    someMethodToHandle403_Forbidden(response);
    break;
  }
  case HttpURLConnection.HTTP_NOT_FOUND:
  {
    someMethodToHandle404_NotFound(response);
    break;
  }
  case HttpURLConnection.HTTP_UNAVAILABLE:
  {
    someMethodToHandle503_Unavailable(response);
    break;
  }
...
*...however many additional http response code cases you're going to handle...*
...
}

尝试处理URL下载的错误代码

1 个答案: