请给出配置Hadoop的hadoop-env.sh，core-site.xml，hdfs-site.xml等的代码

以下是Hadoop的配置文件示例：

1. hadoop-env.sh

# Set Hadoop-related environment variables
export HADOOP_HOME=/usr/local/hadoop
export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop
export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin

2. core-site.xml

<configuration>
  <property>
    <name>fs.defaultFS</name>
    <value>hdfs://localhost:9000</value>
  </property>
</configuration>

3. hdfs-site.xml

<configuration>
  <property>
    <name>dfs.replication</name>
    <value>1</value>
  </property>
  <property>
    <name>dfs.namenode.name.dir</name>
    <value>file:/usr/local/hadoop/hdfs/namenode</value>
  </property>
  <property>
    <name>dfs.datanode.data.dir</name>
    <value>file:/usr/local/hadoop/hdfs/datanode</value>
  </property>
</configuration>

请注意，这些文件的路径和内容可能因您的环境而异，所以请根据您的实际情况进行适当的更改。