课堂小测
编程实现下列要求:
1、创建一个自己姓名首字母的文件夹;
2、在该文件夹下创建一个hdfstest1.txt文件,向文件内输入“班级学号姓名HDFS课堂测试”的文字内容;
3、在文件加下再创建一个hdfstest2.txt文件,并将hdfstest1文件的内容写到该文件中,并将hdfstest2的内容输出。
代码:
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20163540王杰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());
}
}