java.lang.IllegalArgumentException: protocol = http host = null
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/25642104/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
java.lang.IllegalArgumentException: protocol = http host = null
提问by Goko Gorgiovski
For this link http://bits.blogs.nytimes.com/2014/09/02/uber-banned-across-germany-by-frankfurt-court/?partner=rss&emc=rssthis code doesn`t work but if I put another for exemple: https://www.google.comeverything is ok:
对于此链接http://bits.blogs.nytimes.com/2014/09/02/uber-banned-across-germany-by-frankfurt-court/?partner=rss&emc=rss此代码不起作用但如果我再举一个例子：https: //www.google.com一切正常：
URL url = new URL("http://bits.blogs.nytimes.com/2014/09/02/uber-banned-across-germany-by-frankfurt-court/?partner=rss&emc=rss");
URLConnection uc;
uc = url.openConnection();
uc.setRequestProperty("User-Agent", "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_7; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.205 Safari/534.16");
uc.addRequestProperty("referer", "http://www.facebook.com");
uc.connect();
this.input = uc.getInputStream();
I get this exception:
我得到这个例外：
java.lang.IllegalArgumentException: protocol = http host = null
at sun.net.spi.DefaultProxySelector.select(DefaultProxySelector.java:170)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:926)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:850)
at sun.net.www.protocol.http.HttpURLConnection.followRedirect(HttpURLConnection.java:2398)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1557)
at UrlParser.<init>(UrlParser.java:48)
at TikaParser.test_url_parser(TikaParser.java:186)
at TikaParser.run(TikaParser.java:256)
at java.lang.Thread.run(Thread.java:745)
what is wrong with my code?
我的代码有什么问题？
回答by Kai Sternad
回答by wsams
I encountered this same exception when the URL started with http:/instead of http://. e.g. http:/www.example.com
当 URL 以http:/而不是http://. 例如http:/www.example.com
This was in the org.springframework.web.client.RestTemplate.exchange()method, so it's not quite the same context, but maybe a similar issue.
这是在org.springframework.web.client.RestTemplate.exchange()方法中，所以它不是完全相同的上下文，但可能是一个类似的问题。
回答by Dhirendra Gautam
Mostly this error occur due to incorrect url. Make sure the Url that you are hitting is correct.As wsams mentioned try to check the // in your url if it is correct or not. Correct pattern is http://localhost:8080
大多数情况下，此错误是由于 url 不正确造成的。确保您点击的 Url 是正确的。正如 wsams 提到的，尝试检查您的 url 中的 // 是否正确。正确的模式是http://localhost:8080
