讀取hdfs指定目錄下的gz文件，並讀取gz文件裏面的文本信息

package com.bw.credit.hdfs;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
 
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.GZIPInputStream;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
 
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;

import com.google.common.base.Strings;

public class HdfsReader {

    private static Configuration conf = new Configuration();
    private
 
 static String hdfspath = "hdfs://cluster-01:8020";
    public static void main(String[] args) throws IOException {
        HdfsReader ope = new HdfsReader();
        String path = "hdfs://cluster-01:8020/ads/cdrlogs_s/dt=20190320";
        List<String> arr = ope.getFileList(path);
        int lineNum =0;
        int num19 = 0;
        int num00 = 0;
        for (String filepath : arr) {
            System.out.println(filepath);
            InputStream inputStream = null;
            GZIPInputStream gzInputStream = null;
            InputStreamReader reader = null;
            BufferedReader buff = null;
            try {
                FileSystem system = FileSystem.get(conf);
                inputStream = system.open(new Path(hdfspath+filepath));
                gzInputStream = new GZIPInputStream(inputStream);
                reader = new InputStreamReader(gzInputStream);
                buff = new BufferedReader(reader);
                String line = null;
                while((line = buff.readLine())!=null){
                    if(line.contains("2019-03-19"))
                    {
                        num19++;
                    }
                    if(line.contains(",,0"))
                    {
                        num00++;
                    }
                    lineNum++;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        
        System.out.println(lineNum+","+num19+","+num00);
        System.out.println(lineNum-num19-num00);
    }

    /**
     * 獲取hdfs路徑下的文件列表
     *
     * @param srcpath
     * @return
     */
    public List<String> getFileList(String srcpath) {
        List<String> files = new ArrayList<String>();
        try {
            Path path = new Path(srcpath);
            FileSystem fs = path.getFileSystem(conf);
            if (fs.isDirectory(path)) {
                for (FileStatus status : fs.listStatus(path)) {
                    List<String> arr = getFileList(status.getPath().toUri().getPath());
                    files.addAll(arr);
                }
            } else {
                files.add(path.toUri().getPath());
            }
            return files;
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 給定文件名和文件內容，創建hdfs文件
     *
     * @param dst
     * @param contents
     * @throws IOException
     */
    public void createFile(String dst, byte[] contents) throws IOException {
        Configuration conf = new Configuration();
        Path dstPath = new Path(dst);
        FileSystem fs = dstPath.getFileSystem(conf);

        FSDataOutputStream outputStream = fs.create(dstPath);
        outputStream.write(contents);
        outputStream.close();
        System.out.println("create file " + dst + " success!");
        // fs.close();
    }

    /**
     * 刪除hdfs文件
     *
     * @param filePath
     * @throws IOException
     */
    public void delete(String filePath) throws IOException {
        Configuration conf = new Configuration();
        Path path = new Path(filePath);
        FileSystem fs = path.getFileSystem(conf);

        boolean isok = fs.deleteOnExit(path);
        if (isok) {
            System.out.println("delete file " + filePath + " success!");
        } else {
            System.out.println("delete file " + filePath + " failure");
        }
        // fs.close();
    }

    /**
     * 創建hdfs目錄
     *
     * @param path
     * @throws IOException
     */
    public void mkdir(String path) throws IOException {
        Configuration conf = new Configuration();
        Path srcPath = new Path(path);
        FileSystem fs = srcPath.getFileSystem(conf);

        boolean isok = fs.mkdirs(srcPath);
        if (isok) {
            System.out.println("create dir ok!");
        } else {
            System.out.println("create dir failure");
        }
        // fs.close();
    }

    /**
     * 讀取hdfs文件內容，並在控制臺打印出來
     *
     * @param filePath
     * @throws IOException
     */
    public void readFile(String filePath) throws IOException {
        Configuration conf = new Configuration();
        Path srcPath = new Path(filePath);
        FileSystem fs = null;
        URI uri;
        try {
            uri = new URI(filePath);
            fs = FileSystem.get(uri, conf);
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
        InputStream in = null;
        try {
            in = fs.open(srcPath);
            IOUtils.copyBytes(in, System.out, 4096, false);
        } finally {
            IOUtils.closeStream(in);
        }
    }

    /**
     * 下載hdfs文件到本地目錄
     *
     * @param dstPath
     * @param srcPath
     * @throws Exception
     */
    public void downloadFile(String dstPath, String srcPath) throws Exception {
        Path path = new Path(srcPath);
        Configuration conf = new Configuration();
        FileSystem hdfs = path.getFileSystem(conf);

        File rootfile = new File(dstPath);
        if (!rootfile.exists()) {
            rootfile.mkdirs();
        }

        if (hdfs.isFile(path)) {
            // 只下載非txt文件
            String fileName = path.getName();
            if (!fileName.toLowerCase().endsWith("txt")) {
                FSDataInputStream in = null;
                FileOutputStream out = null;
                try {
                    in = hdfs.open(path);
                    File srcfile = new File(rootfile, path.getName());
                    if (!srcfile.exists())
                        srcfile.createNewFile();
                    out = new FileOutputStream(srcfile);
                    IOUtils.copyBytes(in, out, 4096, false);
                } finally {
                    IOUtils.closeStream(in);
                    IOUtils.closeStream(out);
                }
                // 下載完後，在hdfs上將原文件刪除
                this.delete(path.toString());
            }
        } else if (hdfs.isDirectory(path)) {
            File dstDir = new File(dstPath);
            if (!dstDir.exists()) {
                dstDir.mkdirs();
            }
            // 在本地目錄上加一層子目錄
            String filePath = path.toString();// 目錄
            String subPath[] = filePath.split("/");
            String newdstPath = dstPath + subPath[subPath.length - 1] + "/";
            System.out.println("newdstPath=======" + newdstPath);
            if (hdfs.exists(path) && hdfs.isDirectory(path)) {
                FileStatus[] srcFileStatus = hdfs.listStatus(path);
                if (srcFileStatus != null) {
                    for (FileStatus status : hdfs.listStatus(path)) {
                        // 下載子目錄下文件
                        downloadFile(newdstPath, status.getPath().toString());
                    }
                }
            }
        }
    }

    // /**
    // * 下載hdfs文件內容，保存到內存對象中
    // *
    // * @param srcPath
    // * @throws Exception
    // */
    // public void downloadFileByte(String srcPath) throws Exception {
    // Path path = new Path(srcPath);
    // FileSystem hdfs = null;
    // Configuration conf = new Configuration();
    // hdfs = FileSystem.get(URI.create(srcPath), conf);
    // if (hdfs.exists(path)) {
    // if (hdfs.isFile(path)) {
    // //如果是文件
    // FSDataInputStream in = null;
    // FileOutputStream out = null;
    // try {
    // in = hdfs.open(new Path(srcPath));
    // byte[] t = new byte[in.available()];
    // in.read(t);
    // hdfsfiles.add(new HdfsFile(path.getName(), srcPath, t));
    // } finally {
    // IOUtils.closeStream(in);
    // IOUtils.closeStream(out);
    // }
    // } else {
    // //如果是目錄
    // FileStatus[] srcFileStatus = hdfs.listStatus(new Path(srcPath));
    // for (int i = 0; i < srcFileStatus.length; i++) {
    // String srcFile = srcFileStatus[i].getPath().toString();
    // downloadFileByte(srcFile);
    // }
    // }
    // }
    // }
    //
    // public ArrayList<HdfsFile> getHdfsfiles() {
    // return hdfsfiles;
    // }

    /**
     * 將本地目錄或文件上傳的hdfs
     *
     * @param localSrc
     * @param dst
     * @throws Exception
     */
    public void uploadFile(String localSrc, String dst) throws Exception {

        Configuration conf = new Configuration();
        File srcFile = new File(localSrc);
        if (srcFile.isDirectory()) {
            copyDirectory(localSrc, dst, conf);
        } else {
            copyFile(localSrc, dst, conf);
        }
    }

    /**
     * 拷貝本地文件hdfs目錄下
     *
     * @param localSrc
     * @param dst
     * @param conf
     * @return
     * @throws Exception
     */
    private boolean copyFile(String localSrc, String dst, Configuration conf) throws Exception {
        File file = new File(localSrc);
        dst = dst + file.getName();
        Path path = new Path(dst);
        FileSystem fs = path.getFileSystem(conf);// FileSystem.get(conf);
        fs.exists(path);
        InputStream in = new BufferedInputStream(new FileInputStream(file));
        OutputStream out = fs.create(new Path(dst));
        IOUtils.copyBytes(in, out, 4096, true);
        in.close();
        return true;
    }

    /**
     * 拷貝本地目錄到hdfs
     * 
     * @param src
     * @param dst
     * @param conf
     * @return
     * @throws Exception
     */
    private boolean copyDirectory(String src, String dst, Configuration conf) throws Exception {
        Path path = new Path(dst);
        FileSystem fs = path.getFileSystem(conf);
        if (!fs.exists(path)) {
            fs.mkdirs(path);
        }
        File file = new File(src);

        File[] files = file.listFiles();
        for (int i = 0; i < files.length; i++) {
            File f = files[i];
            if (f.isDirectory()) {
                String fname = f.getName();
                if (dst.endsWith("/")) {
                    copyDirectory(f.getPath(), dst + fname + "/", conf);
                } else {
                    copyDirectory(f.getPath(), dst + "/" + fname + "/", conf);
                }
            } else {
                copyFile(f.getPath(), dst, conf);
            }
        }
        return true;
    }
}

讀取hdfs目錄下的gz文件內容