fix example

webmagic-extension/src/main/java/us/codecraft/webmagic/example/MonitorExample.java

@@ -3,7 +3,7 @@ package us.codecraft.webmagic.example;
 import us.codecraft.webmagic.Spider;
 import us.codecraft.webmagic.monitor.SpiderMonitor;
 import us.codecraft.webmagic.processor.example.GithubRepoPageProcessor;
-import us.codecraft.webmagic.processor.example.OschinaBlogPageProcessor;
+import us.codecraft.webmagic.processor.example.ZhihuPageProcessor;
 
 /**
  * @author code4crafer@gmail.com
@@ -13,14 +13,14 @@ public class MonitorExample {
 
     public static void main(String[] args) throws Exception {
 
-        Spider oschinaSpider = Spider.create(new OschinaBlogPageProcessor())
+        Spider zhihuPageProcessor = Spider.create(new ZhihuPageProcessor())
                 .addUrl("http://my.oschina.net/flashsword/blog");
         Spider githubSpider = Spider.create(new GithubRepoPageProcessor())
                 .addUrl("https://github.com/code4craft");
 
-        SpiderMonitor.instance().register(oschinaSpider);
+        SpiderMonitor.instance().register(zhihuPageProcessor);
         SpiderMonitor.instance().register(githubSpider);
-        oschinaSpider.start();
+        zhihuPageProcessor.start();
         githubSpider.start();
     }
 }