只是一段代码片段进行演示：

Path path = new Path(filePath);
FileSystem fs = path.getFileSystem(context.getConfiguration()); // context of mapper or reducer
FSDataInputStream fdsis = fs.open(path);
BufferedReader br = new BufferedReader(new InputStreamReader(fdsis));
String line = "";
ArrayList<String> lines = new ArrayList<String>();
while ((line = br.readLine()) != null) {
    lines.add(line);
}
br.close();