在hadoop1.2.1被预装在一份报告中安装说明java。我装了很多的版本号java以及许多的版本号hadoop，然后发现oracle-java7与hadoop1.2.1能够匹配。
一，安装详细过程例如以下：
1. 安装java： sudo apt-get install oracle-java7-installer
2. 安装hadoop1.2.1： http://hadoop.apache.org/docs/r1.2.1/single_node_setup.html#Download
二。測试是否成功安装（伪分布式模式）：
Format a new distributed-filesystem:
$ bin/hadoop namenode -format
Start the hadoop daemons:
$ bin/start-all.sh
The hadoop daemon log output is written to the ${HADOOP_LOG_DIR} directory (defaults to ${HADOOP_HOME}/logs).
Browse the web interface for the NameNode and the JobTracker; by default they are available at:
NameNode - http://localhost:50070/
JobTracker - http://localhost:50030/
Copy the input files into the distributed filesystem:
$ bin/hadoop fs -put conf input
Run some of the examples provided:
$ bin/hadoop jar hadoop-examples-*.jar grep input output 'dfs[a-z.]+'
Examine the output files:
Copy the output files from the distributed filesystem to the local filesytem and examine them:
$ bin/hadoop fs -get output output
$ cat output/*
When you're done, stop the daemons with:
$ bin/stop-all.sh
三。web UI
1. NameNode：http://localhost:50070/
2. JobTracker ：http://localhost:50030/
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