hadoop 在hdfs中读写文件

写文件：

 

 

//指定configuration
Configuration config = new Configuration();
String time = String.valueOf(end-start);
FileSystem fs = FileSystem.get(URI.create("ListStatus"),config);
OutputStream out = fs.create(new Path("/user/student/data/time.txt")); out.write(time.getBytes());

 

读文件：

 

//指定configuration
Configuration config = new Configuration();
//定义一个DataInputStream
FSDataInputStream indic = null;
ArrayList dictionary = new ArrayList();
FileSystem fs = FileSystem.get(URI.create("ListStatus"),config);
indic = fs.open(new Path("dic/xxx.txt"));
String t = indic.readLine();
while (t != null) {
     dictionary.add(t);
     t = indic.readLine();
}