fastDFS环境已经搭建好了，也能上传图片，但是十分不稳定；当通过postman去模拟上传文件时，虚假机开机时，第一次发送总是失败，报tracker连接失败。之后在次尝试就成功，接着多次发送过后又开始报空指针；
错误代码：
connect to server 192.168.2.231:22122 fail
java.net.SocketTimeoutException: connect timed out
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
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org.csource.common.MyException: getStoreStorage fail, errno code: 0
at org.csource.fastdfs.StorageClient.newWritableStorageConnection(StorageClient.java:1941)
at org.csource.fastdfs.StorageClient.do_upload_file(StorageClient.java:703)
at org.csource.fastdfs.StorageClient.upload_file(StorageClient.java:208)
connect timed out
监测下网络，是不是网络有问题
ping一段时间看看