Hadoop实例之HelloWorld

Hadoop实例之HelloWorld

新建一个Map/Reduce工程文件:HelloWorld.java

import java.io.OutputStream;

import org.apache.Hadoop.conf.*;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.*;

public class HelloWorld {
    public static void main(String[] args) throws Exception {
        Configuration configuration = new Configuration();
        FileSystem fs = FileSystem.get(configuration);
        OutputStream out = fs.create(new Path("./input/bkjia.txt"));
        String str = "Hello World bkjia";
        out.write(str.getBytes());
        out.flush();
        out.close();
    }

}

在src的目录下创建一个文件夹input及输出文件bkjia.txt,运行java程序，打开bkjia.txt可以看到Hello World bkjia