hadoop 读取文件操作

Path hdfsPath = new Path(args[0]);
Configuration conf = new Configuration();
FileSystem fs = FileSystem.get(hdfsPath.toUri(),conf);
CompressionCodecFactory factory = new CompressionCodecFactory(conf);
CompressionCodec codec = factory.getCodec(hdfsPath);

FSDataInputStream inputStream = fs.open(hdfsPath);
BufferedReader reader = null;

try {
    if (codec == null) {
        reader = new BufferedReader(new InputStreamReader(inputStream));
    } else {
        CompressionInputStream comInputStream = codec.createInputStream(inputStream);
        reader = new BufferedReader(new InputStreamReader(comInputStream));
    }
} catch (Exception e) {
    e.printStackTrace();
}