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我想在 Java 项目中从 Google Agenda 获取 ICS 文件，而不使用 API（只是获取 ics 的内容）。日历设置为“公共”，我从参数（ https://www.google.com/calendar/ical/perrine.lbc62%40gmail.com/public/basic.ics）获得公共地址。如果我在浏览器中尝试这个地址，我可以下载文件（如果我没有连接的话）。

但是，如果我尝试使用 curl 命令行或我的 Java 代码获取内容，它就不起作用：我无法连接到 URL。

卷曲说：卷曲：（7）无法连接到主机

Java代码如下：

private ICalendar getICalWithUrl(String url) throws Exception {
    ICalendar iCal = null; 
    // Create an instance of HttpClient.
    HttpClient client = new HttpClient();
    // Create a method instance.
    GetMethod method = new GetMethod(url);
    // Provide custom retry handler is necessary
    method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(3, false));
    try {
      // Execute the method.
      int statusCode = client.executeMethod(method);
      if (statusCode != HttpStatus.SC_OK) {
        throw new Exception("Unable to get content at the url "+url+". Method failed: " + method.getStatusLine());
      }
      // Read the response body.
      byte[] responseBody = method.getResponseBody();
      iCal=BiweeklyManager.parse(new String(responseBody));
    } finally {
      // Release the connection.
      method.releaseConnection();
    }
    return iCal;  
}

堆栈跟踪如下：

java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:519)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:550)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.<init>(SSLSocketImpl.java:394)
        at com.sun.net.ssl.internal.ssl.SSLSocketFactoryImpl.createSocket(SSLSocketFactoryImpl.java:123)
        at org.apache.commons.httpclient.protocol.SSLProtocolSocketFactory.createSocket(SSLProtocolSocketFactory.java:81)
        at org.apache.commons.httpclient.protocol.SSLProtocolSocketFactory.createSocket(SSLProtocolSocketFactory.java:126)
        at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:706)
        at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:386)
        at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
        at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
        at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324)

您知道为什么在这种情况下我无法访问该 url，我该怎么做才能访问它？

非常感谢你的回答 ：）

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1 回答 1

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您在公司环境中吗？这听起来像是代理设置问题，尤其是考虑到您是从浏览器访问它的情况下。

尝试使用 --proxy 选项进行 curl （参见Linux curl command with proxy示例）

于 2013-11-04T11:00:15.927 回答