连接时，提示如下错误：

javax.security.auth.login.LoginException: Login failed: Cannot run program "whoami": CreateProcess error=2, ϵͳÕҲ»µ½ָ¶
 at org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:250)
 at org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:275)
 at org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:257)
 at org.apache.hadoop.security.UserGroupInformation.login(UserGroupInformation.java:67)
 at org.apache.hadoop.fs.FileSystem$Cache$Key.(FileSystem.java:1438)
 at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1376)
 at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:215)
 at test.main(test.java:17)
Exception in thread "main" java.io.IOException
 at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:173)
 at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:75)
 at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1367)
 at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:56)
 at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1379)
 at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:215)
 at test.main(test.java:17)
Caused by: javax.security.auth.login.LoginException: Login failed: Cannot run program "whoami": CreateProcess error=2, ϵͳÕҲ»µ½ָ¶
 at org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:250)
 at org.apache.hadoop.security.UnixUserGroupInformation.login(UnixUserGroupInformation.java:275)
 at org.apache.hadoop.hdfs.DFSClient.(DFSClient.java:171)
 ... 6 more

解决办法：

 安装cygwin，在Path环境变量中配置cygwin的bin目录，使用cygwin的whoami实现登陆。