参考

import com.bigdata.kafka.originalLog.HDFSOutputStreamPool;
import com.bigdata.kafka.originalLog.StringUtil;
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;
import org.apache.hadoop.io.IOUtils;
import org.junit.Test;

import java.io.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;

/**
 * 测试类
 */
public class TestHDFS {

    static List<File> filelist = new ArrayList<File>();

    @Test
    public void testReadHDFS() throws IOException {
        Configuration conf = new Configuration();
        FileSystem fs = FileSystem.get(conf);
        FSDataInputStream in = fs.open(new Path("hdfs://mycluster/user/centos/words.txt"));
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        IOUtils.copyBytes(in, baos, 1024);
        System.out.println(new String(baos.toByteArray()));
    }


    @Test
    public void testReadHDFS1() throws IOException {

//        FSDataInputStream in = fs.open(new Path("hdfs://mycluster/user/centos/words.txt"));
//        ByteArrayOutputStream baos = new ByteArrayOutputStream();
//        IOUtils.copyBytes(in, baos, 1024);
//        System.out.println(new String(baos.toByteArray()));
        List<File> filelist = getFileList("E:\MyProject\bigdata\data");
        System.out.println(filelist.size());
        FSDataOutputStream out = null;
        for (File f : filelist) {
            BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(f)));
            String line = null;
            while ((line = in.readLine()) != null) {
                String newline = line + "________2100100";
//              out = HDFSOutputStreamPool.getInstance().takeOutputStream("/test/merge.txt");

                Configuration conf = new Configuration();
                FileSystem fs = FileSystem.get(conf);
              out= fs.append(new Path("/test/merge.txt"));
                out.write(newline.getBytes());
                out.write("
".getBytes());
                out.hsync();
                out.close();
            }
        }


    }

    public static List<File> getFileList(String strPath) {
        File dir = new File(strPath);
        File[] files = dir.listFiles(); // 该文件目录下文件全部放入数组
        if (files != null) {
            for (int i = 0; i < files.length; i++) {
                String fileName = files[i].getName();
                if (files[i].isDirectory()) { // 判断是文件还是文件夹
                    getFileList(files[i].getAbsolutePath()); // 获取文件绝对路径
                } else if (fileName.endsWith("txt")) { // 判断文件名是否以.avi结尾
                    String strFileName = files[i].getAbsolutePath();
                    System.out.println("---" + strFileName);
                    filelist.add(files[i]);
                } else {
                    continue;
                }
            }

        }
        return filelist;
    }

    /**
     * 28/Feb/2017:12:17:48
     */
    @Test
    public void testDate() throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("dd/MMM/yyyy:HH:mm:ss", Locale.US);
        Date date = new Date();
        System.out.println(sdf.format(date));

        Date d = sdf.parse("28/Feb/2017:12:17:48");
        System.out.println(d);
        SimpleDateFormat localSDF = new SimpleDateFormat("yyyy/MM/dd/HH/mm", Locale.US);
        System.out.println(localSDF.format(d));
    }

    @Test
    public void test1() {
        String log =/* new String(msg) ;*/ "s203|||192.168.231.1|||-|||28/Feb/2017:15:34:45 +0800|||GET /eshop/phone/mi.html HTTP/1.0|||200|||213|||-|||ApacheBench/2.3|||-";
        String[] arr = StringUtil.splitLog(log);
        //主机名
        String hostname = StringUtil.getHostname(arr);
        //日期串
        String dateStr = StringUtil.formatYyyyMmDdHhMi(arr);
        //path
        String rawPath = "/user/centos/eshop/raw/" + dateStr + "/" + hostname + ".log";
        //写入数据到hdfs
        System.out.println(log);
    }
}