我试图用 nutch 抓取网站并得到这个错误:
java.net.MalformedURLException: no protocol:
    Exception in thread "main" java.io.IOException: Job failed!
            at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1265)
            at org.apache.nutch.crawl.Injector.inject(Injector.java:296)
            at org.apache.nutch.crawl.Crawl.run(Crawl.java:127)
            at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
            at org.apache.nutch.crawl.Crawl.main(Crawl.java:55)