springBoo整合HDFS

1、环境准备

1、HDFS环境搭建：https://blog.csdn.net/BlaineLi/article/details/103135082
2、SpringBoot 2.1.1版本；

2、代码实现

1、pom.xml文件

	
    4.0.0

    com.ljl
    hadoop_test
    1.0-SNAPSHOT

    
        org.springframework.boot
        spring-boot-starter-parent
        2.1.1.RELEASE
    
    
        UTF-8
        UTF-8
        1.8
    

    

    
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.projectlombok
            lombok
            true
        

        
            com.alibaba
            fastjson
            1.2.41
        

        
        
            org.apache.hadoop
            hadoop-common
            3.1.1
        
        
            org.apache.hadoop
            hadoop-hdfs
            3.1.1
        
        
            org.apache.hadoop
            hadoop-client
            3.1.1
        
        
            org.apache.hadoop
            hadoop-mapreduce-client-core
            3.1.1
        

        
        
            io.springfox
            springfox-swagger-ui
            2.9.2
        

        
            io.springfox
            springfox-swagger2
            2.9.2
        

        
        
            com.google.guava
            guava
            23.0
        


 

    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

2、application.yml 文件

server:
  port: 8083

spring:
  application:
    name: hadoopDemo
  servlet:
    multipart:
      max-file-size: 1GB
      max-request-size: 1GB

3、application.properties 文件

hdfs.path=hdfs://192.168.249.133:9000

4、HDFS配置类

package com.ljl.hadoopconf;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;

/**
 * @author ：
 * @date ：Created in 2019/11/5 11:32
 * @description：
 * @modified By：
 * @version:
 */

@Configuration
public class HDFSConf {
    @Value("${hdfs.path}")
    private String path;

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }


}

5、HDFSService类

package com.ljl.hadoopconf;

import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.PostConstruct;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


/**
 *
 * @author ：
 * @date ：Created in 2019/11/5 13:02
 * @description：
 * @modified By：
 * @version:
 */
@Service
public class HdfsService {
    @Value("${hdfs.path}")
    private String path;
//    @Value("${hdfs.username}")
//    private String username;

    private static String hdfsPath;
    private static String hdfsName;
    private static final int bufferSize = 1024 * 1024 * 64;

    /**
     * 获取HDFS配置信息
     * @return
     */
    private static Configuration getConfiguration() {
        Configuration configuration = new Configuration();
        configuration.set("fs.defaultFS", hdfsPath);
        return configuration;
    }

    /**
     * 获取HDFS文件系统对象
     * @return
     * @throws Exception
     */
    public static FileSystem getFileSystem() throws Exception {
        // 客户端去操作hdfs时是有一个用户身份的，默认情况下hdfs客户端api会从jvm中获取一个参数作为自己的用户身份
        // DHADOOP_USER_NAME=hadoop
        // 也可以在构造客户端fs对象时，通过参数传递进去
        FileSystem fileSystem = FileSystem.get(new URI(hdfsPath), getConfiguration(), hdfsName);
        return fileSystem;
    }

    /**
     * 在HDFS创建文件夹
     * @param path
     * @return
     * @throws Exception
     */
    public static boolean mkdir(String path) throws Exception {
        if (StringUtils.isEmpty(path)) {
            return false;
        }
        if (existFile(path)) {
            return true;
        }
        FileSystem fs = getFileSystem();
        // 目标路径
        Path srcPath = new Path(path);
        boolean isOk = fs.mkdirs(srcPath);
        fs.close();
        return isOk;
    }

    /**
     * 判断HDFS文件是否存在
     * @param path
     * @return
     * @throws Exception
     */
    public static boolean existFile(String path) throws Exception {
        if (StringUtils.isEmpty(path)) {
            return false;
        }
        FileSystem fs = getFileSystem();
        Path srcPath = new Path(path);
        boolean isExists = fs.exists(srcPath);
        return isExists;
    }

    /**
     * 读取HDFS目录信息
     * @param path
     * @return
     * @throws Exception
     */
    public static List<Map<String, Object>> readPathInfo(String path) throws Exception {
        if (StringUtils.isEmpty(path)) {
            return null;
        }
        if (!existFile(path)) {
            return null;
        }
        FileSystem fs = getFileSystem();
        // 目标路径
        Path newPath = new Path(path);
        FileStatus[] statusList = fs.listStatus(newPath);
        List<Map<String, Object>> list = new ArrayList<>();
        if (null != statusList && statusList.length > 0) {
            for (FileStatus fileStatus : statusList) {
                Map<String, Object> map = new HashMap<>();
                map.put("filePath", fileStatus.getPath());
                map.put("fileStatus", fileStatus.toString());
                list.add(map);
            }
            return list;
        } else {
            return null;
        }
    }

    /**
     * 用流将文件写入HDFS
     * @param path HDFS上的路径
     * @param file 文件
     * @throws Exception
     */
    public static void writFileInHDFS(String path, MultipartFile file) throws Exception {
        if (StringUtils.isEmpty(path) || null == file.getBytes()) {
            return;
        }

        FileSystem fs = getFileSystem();
        Path newPath = new Path(path);
        // 打开一个输出流
        FSDataOutputStream outputStream = fs.create(newPath);
        outputStream.write(file.getBytes());
        outputStream.close();
        fs.close();
    }

    /**
     * 读取HDFS文件内容
     * @param path
     * @return
     * @throws Exception
     */
    public static String readFile(String path) throws Exception {
        if (StringUtils.isEmpty(path)) {
            return null;
        }
        if (!existFile(path)) {
            return null;
        }
        FileSystem fs = getFileSystem();
        // 目标路径
        Path srcPath = new Path(path);
        FSDataInputStream inputStream = null;
        try {
            inputStream = fs.open(srcPath);
            // 防止中文乱码
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            String lineTxt = "";
            StringBuffer sb = new StringBuffer();
            while ((lineTxt = reader.readLine()) != null) {
                sb.append(lineTxt);
            }
            return sb.toString();
        } finally {
            inputStream.close();
            fs.close();
        }
    }

    /**
     * 读取HDFS文件列表
     * @param path
     * @return
     * @throws Exception
     */
    public static List<Map<String, String>> listFile(String path) throws Exception {
        if (StringUtils.isEmpty(path)) {
            return null;
        }
        if (!existFile(path)) {
            return null;
        }

        FileSystem fs = getFileSystem();
        // 目标路径
        Path srcPath = new Path(path);
        // 递归找到所有文件
        RemoteIterator<LocatedFileStatus> filesList = fs.listFiles(srcPath, true);
        List<Map<String, String>> returnList = new ArrayList<>();
        while (filesList.hasNext()) {
            LocatedFileStatus next = filesList.next();
            String fileName = next.getPath().getName();
            Path filePath = next.getPath();
            Map<String, String> map = new HashMap<>();
            map.put("fileName", fileName);
            map.put("filePath", filePath.toString());
            returnList.add(map);
        }
        fs.close();
        return returnList;
    }

    /**
     * HDFS重命名文件
     * @param oldName
     * @param newName
     * @return
     * @throws Exception
     */
    public static boolean renameFile(String oldName, String newName) throws Exception {
        if (StringUtils.isEmpty(oldName) || StringUtils.isEmpty(newName)) {
            return false;
        }
        FileSystem fs = getFileSystem();
        // 原文件目标路径
        Path oldPath = new Path(oldName);
        // 重命名目标路径
        Path newPath = new Path(newName);
        boolean isOk = fs.rename(oldPath, newPath);
        fs.close();
        return isOk;
    }

    /**
     * 删除HDFS文件
     * @param path
     * @return
     * @throws Exception
     */
    public static boolean deleteFile(String path) throws Exception {
        if (StringUtils.isEmpty(path)) {
            return false;
        }
        if (!existFile(path)) {
            return false;
        }
        FileSystem fs = getFileSystem();
        Path srcPath = new Path(path);
        boolean isOk = fs.deleteOnExit(srcPath);
        fs.close();
        return isOk;
    }

    /**
     * 上传HDFS文件
     * @param path
     * @param uploadPath
     * @throws Exception
     */
    public static void uploadFile(String path, String uploadPath) throws Exception {
        if (StringUtils.isEmpty(path) || StringUtils.isEmpty(uploadPath)) {
            return;
        }
        FileSystem fs = getFileSystem();
        // 上传路径
        Path clientPath = new Path(path);
        // 目标路径
        Path serverPath = new Path(uploadPath);

        // 调用文件系统的文件复制方法，第一个参数是否删除原文件true为删除，默认为false
        fs.copyFromLocalFile(true, clientPath, serverPath);
        fs.close();
    }

    /**
     * 下载HDFS文件
     * @param path
     * @param downloadPath
     * @throws Exception
     */
    public static void downloadFile(String path, String downloadPath) throws Exception {

        if (StringUtils.isEmpty(path) || StringUtils.isEmpty(downloadPath)) {
            return;
        }
        FileSystem fs = getFileSystem();
        // 上传路径
        Path clientPath = new Path(path);
        // 目标路径
        Path serverPath = new Path(downloadPath);

        // 调用文件系统的文件复制方法，第一个参数是否删除原文件true为删除，默认为false
        fs.copyToLocalFile(false, clientPath, serverPath);
        fs.close();
    }

    /**
     * HDFS文件复制
     * @param sourcePath
     * @param targetPath
     * @throws Exception
     */
    public static void copyFile(String sourcePath, String targetPath) throws Exception {
        if (StringUtils.isEmpty(sourcePath) || StringUtils.isEmpty(targetPath)) {
            return;
        }
        FileSystem fs = getFileSystem();
        // 原始文件路径
        Path oldPath = new Path(sourcePath);
        // 目标路径
        Path newPath = new Path(targetPath);

        FSDataInputStream inputStream = null;
        FSDataOutputStream outputStream = null;
        try {
            inputStream = fs.open(oldPath);
            outputStream = fs.create(newPath);

            IOUtils.copyBytes(inputStream, outputStream, bufferSize, false);
        } finally {
            inputStream.close();
            outputStream.close();
            fs.close();
        }
    }

    /**
     * 打开HDFS上的文件并返回byte数组
     * @param path
     * @return
     * @throws Exception
     */
    public static byte[] openFileToBytes(String path) throws Exception {
        if (StringUtils.isEmpty(path)) {
            return null;
        }
        if (!existFile(path)) {
            return null;
        }
        FileSystem fs = getFileSystem();
        // 目标路径
        Path srcPath = new Path(path);
        try {
            FSDataInputStream inputStream = fs.open(srcPath);
            return IOUtils.readFullyToByteArray(inputStream);
        } finally {
            fs.close();
        }
    }

    /**
     * 获取某个文件在HDFS的集群位置
     * @param path
     * @return
     * @throws Exception
     */
    public static BlockLocation[] getFileBlockLocations(String path) throws Exception {
        if (StringUtils.isEmpty(path)) {
            return null;
        }
        if (!existFile(path)) {
            return null;
        }
        FileSystem fs = getFileSystem();
        // 目标路径
        Path srcPath = new Path(path);
        FileStatus fileStatus = fs.getFileStatus(srcPath);
        return fs.getFileBlockLocations(fileStatus, 0, fileStatus.getLen());
    }

    @PostConstruct
    public void getPath() {
        hdfsPath = this.path;
    }



}

5、controller 类

package com.ljl.controller;

import com.alibaba.fastjson.JSONObject;
import com.ljl.hadoopconf.HdfsService;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.fs.BlockLocation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.util.List;
import java.util.Map;


/**
 * 已经全部测试均可用
 * @author ：
 * @date ：Created in 2019/11/7 15:25
 * @description：
 * @modified By：
 * @version:
 */
@RestController
@RequestMapping("/hadoop")
public class DemoController {
    private static Logger LOGGER = LoggerFactory.getLogger(DemoController.class);

    /**
     * 创建文件夹
     * @param path
     * @return
     * @throws Exception
     */
   
    @RequestMapping(value = "mkdir", method = RequestMethod.POST)
    @ResponseBody
    public JSONObject mkdir(@RequestParam("path") String path) throws Exception {
        JSONObject object = new  JSONObject( );
        if (StringUtils.isEmpty(path)) {
            object.put("message", "请求参数为空");
            LOGGER.debug("请求参数为空");
            return object;
        }
        // 创建空文件夹
        boolean isOk = HdfsService.mkdir(path);
        if (isOk) {
            LOGGER.debug("文件夹创建成功");
            object.put("message", "文件夹创建成功");
            return object;
        } else {
            LOGGER.debug("文件夹创建失败");
            object.put("message", "文件夹创建成功");
            return object;
        }
    }

    /**
     * 读取HDFS目录信息
     * @param path
     * @return
     * @throws Exception
     */
   
    @PostMapping("/readPathInfo")
    public JSONObject  readPathInfo(@RequestParam("path") String path) throws Exception {
        List<Map<String, Object>> list = HdfsService.readPathInfo(path);
        JSONObject object = new  JSONObject( );
        object.put( "读取HDFS目录信息成功", list);
        return object;
    }



    /**
     * 读取HDFS文件内容
     * @param path hdfs上路径
     * @return
     * @throws Exception
     */
    @PostMapping("/readFile")
    public JSONObject readFile(@RequestParam("path") String path) throws Exception {
        JSONObject object = new  JSONObject( );
        String targetPath = HdfsService.readFile(path);
        object.put("message", "读取HDFS文件内容success");
        object.put("data",targetPath);
        return object;

    }


    /**
     * 读取文件列表
     * @param path hdfs上路径
     * @return
     * @throws Exception
     */
    @PostMapping("/listFile")
    public JSONObject listFile(@RequestParam("path") String path) throws Exception {
        JSONObject object = new  JSONObject( );
        if (StringUtils.isEmpty(path)) {
            object.put("message","请求参数为空");
            return object;
        }
        List<Map<String, String>> returnList = HdfsService.listFile(path);
        object.put("message","读取文件列表成功");
        object.put("data",returnList);
        return object;
    }


    /**
     * 重命名文件
     * @param oldName
     * @param newName
     * @return
     * @throws Exception
     */
    @PostMapping("/renameFile")
    public JSONObject renameFile(@RequestParam("oldName") String oldName, @RequestParam("newName") String newName)
            throws Exception {
        JSONObject object = new  JSONObject( );
        if (StringUtils.isEmpty(oldName) || StringUtils.isEmpty(newName)) {
            object.put("message","请求参数为空");
            return object;
        }
        boolean isOk = HdfsService.renameFile(oldName, newName);
        if (isOk) {
            object.put("message","文件重命名成功");
            return object;
        } else {
            object.put("message","文件重命名失败");
            return object;
        }
    }

    /**
     * 删除文件
     * @param path hdfs 上的路径
     * @return
     * @throws Exception
     */
    @PostMapping("/deleteFile")
    public JSONObject deleteFile(@RequestParam("path") String path) throws Exception {
        JSONObject object = new  JSONObject( );
        boolean isOk = HdfsService.deleteFile(path);
        if (isOk) {
            object.put("message","delete file success");
            return object;
        } else {
            object.put("message","delete file fail");
            return object;
        }
    }



    /**
     * 上传文件
     * @param path 本地文件路径
     * @param uploadPath hdfs上路径
     * @return
     * @throws Exception
     */
    @PostMapping("/uploadFile")
    public String uploadFile(@RequestParam("path") String path, @RequestParam("uploadPath") String uploadPath)
            throws Exception {
        HdfsService.uploadFile(path, uploadPath);
        return    "upload file success" ;
    }

    /**
     * 下载文件
     * @param path 目标路径
     * @param downloadPath 源路径
     * @return
     * @throws Exception
     */
    @PostMapping("/downloadFile")
    public String downloadFile(@RequestParam("path") String path, @RequestParam("downloadPath") String downloadPath)
            throws Exception {
        HdfsService.downloadFile(path, downloadPath);
        return  "download file success" ;
    }

    /**
     * HDFS文件复制
     * @param sourcePath 源文件路径 例如:/user/Administrator/001/11.jpg
     * @param targetPath 目标路径 例如:/user/Administrator/111/11.jpg
     * @return
     * @throws Exception
     */
    @PostMapping("/copyFile")
    public String copyFile(@RequestParam("sourcePath") String sourcePath, @RequestParam("targetPath") String targetPath)
            throws Exception {
        HdfsService.copyFile(sourcePath, targetPath);
        return  "copy file success" ;
    }

    /**
     * 查看文件是否已存在
     * @param path hdfs上文件路径
     * @return
     * @throws Exception
     */
    @PostMapping("/existFile")
    public String existFile(@RequestParam("path") String path) throws Exception {
        boolean isExist = HdfsService.existFile(path);
        return   "file isExist: " + isExist ;
    }



}

3 、项目地址

https://github.com/lijianleiGit/SpringBoot-HDFS