参考：http://www.bkjia.com/ASPjc/931209.html
1.hadoop环境配置
2.hadoop bin下添加winutils.exe
3.hadoop.dll放到C:\Windows\System32
代码配置
//hadoop执行者
System.setProperty("HADOOP_USER_NAME","root");
//hadoop目录
System.setProperty("hadoop.home.dir", "D:\\hadoop\\hadoop-2.5.2");
//集群连接配置
Configuration conf=new Configuration();
conf.set("fs.defaultFS", "hdfs://node1:8020");
conf.set("yarn.resourcemanager.hostname", "node3");
