MyEclipse運行的時候報錯，菜鳥不理解是什么意思，最后找了一些資料才知道是因為缺少commons-logging.jar包
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at org.apache.commons.httpclient.HttpClient.<clinit>(HttpClient.java:66)
at com.httputils.HttpUtil.methodPost(HttpUtil.java:26)
at com.test.UrlTest.main(UrlTest.java:36)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 3 more
解決方案：把commons-logging.jar放到百度里面搜索一下，查詢出來結果后，點擊第一個Apache官網，下載相應的Jar包，解壓，找到jar文件，然后放到你項目WEB-INF/lib里面就可以了