java.net.MalformedURLException: no protocol: //wx4.sinaimg.cn/thumb180/86da6a54ly1fh8wjl5xcbg207s0dou0z.gif
at java.net.URL.(URL.java:593)
at java.net.URL.(URL.java:490)
at java.net.URL.(URL.java:439)
at com.htt.baixin.Jiandan.writeDir(Jiandan.java:66)
at com
java.net.MalformedURLException: no protocol: //wx4.sinaimg.cn/thumb180/86da6a54ly1fh8wjl5xcbg207s0dou0z.gif at java.net.URL.(URL.java:593) at java.net.URL.(URL.java:490) at java.net.URL.(URL.java:439) at com.htt.baixin.Jiandan.writeDir(Jiandan.java:66) at com
简单可用，可以作为上手练习，比较简单，纯获取指定url的图片。