1. 新建一个 springboot 项目，新增 hadoop 依赖。

   <!-- hadoop 依赖 -->
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-hdfs</artifactId>
            <version>2.7.4</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>javax.servlet</groupId>
                    <artifactId>servlet-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-common -->
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-common</artifactId>
            <version>2.7.4</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>javax.servlet</groupId>
                    <artifactId>servlet-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>2.7.4</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>javax.servlet</groupId>
                    <artifactId>servlet-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- https://mvnrepository.com/artifact/log4j/log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.16</version>
            <scope>compile</scope>
        </dependency>

2. 在 application.properties 配置文件新增 hadoop 配置

# 通过在虚拟机执行 hdfs getconf -confKey fs.default.name  获取正确地址和端口号，注意替换成ip地址
hadoop.name-node: hdfs://192.168.101.111:8020
# 下面是创建hdfs文件夹
hadoop.namespace: /test1

3. 下载 hadoop 的包，解压包到指定目录下

整理好的 hadoop 的包下载地址 hadoop 包的下载地址，不然执行会报错：java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.

4. 在测试类中执行创建 hdfs 文件夹，上传，下载文件

 @Value("${hadoop.name-node}")
    private String nameNode;
 
    @Value("${hadoop.name-node}")
    private String filePath;
 
    @Test
    public void init() throws URISyntaxException, IOException {
        //指定刚才解压缩hadoop文件地址
        System.setProperty("hadoop.home.dir", "H:\\hadoop-2.7.2");
        //1.获取文件系统
        Configuration configuration = new Configuration();
        FileSystem fs = FileSystem.get(new URI(nameNode), configuration);
        //2.执行操作 创建hdfs文件夹
        Path path = new Path(filePath);
        if (!fs.exists(path)) {
            fs.mkdirs(path);
        }
        //关闭资源
        fs.close();
        System.out.println("结束！");
    }
 
    @Test
    public void upload() throws URISyntaxException, IOException {
        System.setProperty("hadoop.home.dir", "H:\\hadoop-2.7.2");
        //1.获取文件系统
        Configuration configuration = new Configuration();
        FileSystem fs = FileSystem.get(new URI(nameNode), configuration);
        //2.执行操作 上传文件
        fs.copyFromLocalFile(false,true, new Path("C:\\Users\\New\\Desktop\\test.txt"), new Path(filePath));
        //关闭资源
        fs.close();
        System.out.println("结束！");
    }
 
    @Test
    public void download() throws URISyntaxException, IOException {
        System.setProperty("hadoop.home.dir", "H:\\hadoop-2.7.2");
        //1.获取文件系统
        Configuration configuration = new Configuration();
        FileSystem fs = FileSystem.get(new URI(nameNode), configuration);
        //2.执行操作 下载文件
        fs.copyToLocalFile(false, new Path(filePath+"/test.txt"), new Path("D:\\"), true);
        //关闭资源
        fs.close();
        System.out.println("结束！");
    }

5. 查看结果

demo 的 github 地址

“

https://github.com/OnTheWayZP/hadoop

”

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作者：zapoul

来源链接：

https://blog.csdn.net/m0_38089730/article/details/100728639