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    import java.io.IOException;

    import org.apache.hadoop.conf.Configuration;
    import org.apache.hadoop.fs.FSDataOutputStream;
    import org.apache.hadoop.fs.FileSystem;
    import org.apache.hadoop.fs.Path;

    public class MainClass {
    public static void main(String[] args) throws IOException {
    Configuration conf=new Configuration();
    conf.set("fs.default.name", "hdfs://localhost:9000");
    Path inFile =new Path("lzq/hdfstest1.txt");
    FileSystem hdfs=FileSystem.get(conf);
    FSDataOutputStream outputStream=hdfs.create(inFile);
    outputStream.writeUTF("信1605-1班20163594李志强HDFS课堂测试");
    outputStream.flush();
    outputStream.close();
    }
    }

    import java.io.IOException;

    import org.apache.hadoop.conf.Configuration;
    import org.apache.hadoop.fs.FSDataInputStream;
    import org.apache.hadoop.fs.FSDataOutputStream;
    import org.apache.hadoop.fs.FileSystem;
    import org.apache.hadoop.fs.Path;

    public class Read {
    public static void main(String[] args) throws IOException {
    Configuration conf=new Configuration();
    conf.set("fs.default.name", "hdfs://localhost:9000");
    Path inFile =new Path("/user/hadoop/lzq/hdfstest1.txt");
    Path newFile =new Path("/user/hadoop/lzq/hdfstest2.txt");


    FileSystem hdfs=FileSystem.get(conf);
    FSDataOutputStream outputStream=hdfs.create(newFile);

    FSDataInputStream inputStream=hdfs.open(inFile);
    String str = inputStream.readUTF();
    inputStream.close();

    outputStream.writeUTF(str);
    outputStream.flush();
    outputStream.close();

    inputStream=hdfs.open(newFile);
    System.out.println(inputStream.readUTF());
    }
    }

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  • 原文地址:https://www.cnblogs.com/lijing925/p/9733272.html
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