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  • HDFS客户端操作

    1、maven依赖

     1 <dependency>
     2             <groupId>org.apache.hadoop</groupId>
     3             <artifactId>hadoop-common</artifactId>
     4             <exclusions>
     5                 <exclusion>
     6                     <groupId>com.google.guava</groupId>
     7                     <artifactId>guava</artifactId>
     8                 </exclusion>
     9             </exclusions>
    10             <version>3.1.4</version>
    11         </dependency>
    12         <dependency>
    13             <groupId>org.apache.hadoop</groupId>
    14             <artifactId>hadoop-client</artifactId>
    15             <exclusions>
    16                 <exclusion>
    17                         <groupId>com.google.guava</groupId>
    18                         <artifactId>guava</artifactId>
    19                 </exclusion>
    20             </exclusions>
    21             <version>3.1.4</version>
    22         </dependency>
    23         <dependency>
    24             <groupId>org.apache.hadoop</groupId>
    25             <artifactId>hadoop-hdfs</artifactId>
    26             <exclusions>
    27                 <exclusion>
    28                     <groupId>com.google.guava</groupId>
    29                     <artifactId>guava</artifactId>
    30                 </exclusion>
    31             </exclusions>
    32             <version>3.1.4</version>
    33         </dependency>
    34         <!-- 版本选择应该和hadoop的sharehadoophdfslib目录下面的guava版本一致-->
    35         <dependency>
    36             <groupId>com.google.guava</groupId>
    37             <artifactId>guava</artifactId>
    38             <version>27.0-jre</version>
    39         </dependency>
    40         <dependency>
    41             <groupId>org.apache.hadoop</groupId>
    42             <artifactId>hadoop-auth</artifactId>
    43             <version>3.1.4</version>
    44         </dependency>
    45         <dependency>
    46             <groupId>jdk.tools</groupId>
    47             <artifactId>jdk.tools</artifactId>
    48             <version>1.8</version>
    49             <scope>system</scope>
    50             <systemPath>${JAVA_HOME}/lib/tools.jar</systemPath>
    51         </dependency>
    View Code

    2、windowns10配置hadoop

    (1)、镜像下载地址

    https://mirrors.tuna.tsinghua.edu.cn/apache/hadoop/common/

    (2)、 解压Hadoop镜像文件到磁盘目录下,注意:可以解压在非C盘下,存储目录不要包含中文和空格

    (3)、 配置HADOOP_HOME环境变量,并在系统环境变量Path中添加Hadoop环境变量

    (4)、打开cmd窗口,输入hadoop version命令验证

    (5)、在githubs行将hadoop.dll和winutils.exe拷贝到hadoop的安装的bin目录下

    github地址:https://github.com/steveloughran/winutils/tree/master/hadoop-3.0.0/bin

     3、代码编写

    public class TestHDFS {
    
        public static void main(String[] args) throws IOException, URISyntaxException, InterruptedException {
            Configuration configuration = new Configuration();
            //1、获取hdfs客户端 指定HDFS中NameNode的地址和操作用户
            FileSystem fs = FileSystem.get(new URI("hdfs://k8smaster:9000"),configuration,"root");
            //2、查看指定路径是否存在
            System.err.println(fs.exists(new Path("/home")));
            //3、创建路径
            System.err.println(fs.mkdirs(new Path("/test")));
            //3、释放资源
            fs.close();
            System.err.println("===============执行完成============");
        }
    }

    4、结果验证

      

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  • 原文地址:https://www.cnblogs.com/cq-yangzhou/p/14373894.html
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