1.设置hadoop-env.sh的export HADOOP_CLASSPATH=/home/grid/hadoop-1.2.1/myclass

2.设置JAVA_HOME和ClassPath

export PATH=:/home/grid/jdk1.6.0_30/bin

export JAVA_HOME=/home/grid/jdk1.6.0_30

3.用javac命令编译javac -classpath ../hadoop-core-1.2.1.jar FileSystemCat.java

4.向Hadoop复制文件bin/hadoop fs -put build.xml ./in
5.查看复制的文件：bin/hadoop fs -ls .

6. 运行编译好的文件：../bin/hadoop FileSystemCat hdfs://master:9000/user/grid/in/build.xml
7.编译结果：