如何編寫hadoop java程序

# mkdir class

#Javac -classpath .:lib/hadoop-common-2.2.0.jar:lib/hadoop-annotations-2.2.0.jar -d class HADemo.java

2.生成jar包

#jar -cvf hademo.jar -C class/ .

added manifest

adding: com/(in = 0) (out= 0)(stored 0%)

adding: com/wan/(in = 0) (out= 0)(stored 0%)

adding: com/wan/demo/(in = 0) (out= 0)(stored 0%)

adding: com/wan/demo/HADemo.class(in = 844) (out= 520)(deflated 38%)

3.測試運行

#hadoop jar hademo.jar com.wan.demo.HADemo /test

檢測：

#hadoop fs -ls /