|NO.Z.00018|——————————|BigDataEnd|——|Hadoop&HDFS.V03|——|Hadoop.v03|HDFS之API客户端|解决文件|权限问题|

一、[HDFS之API客户端解决文件权限问题] 
### --- JAVA客户端：客户端环境准备

~~~     将Hadoop-2.9.2安装包解压到非中文路径（例如：E:\hadoop-2.9.2）。
~~~     配置HADOOP_HOME环境变量
~~~     配置Path环境变量。
~~~     在IDEA下创建一个Maven工程ClientDemo
二、导入相应的依赖坐标+日志配置文件
    <!-- hadoop-common , hadoop-client, hadoop-hdfs-->
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.8.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-common -->
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-common</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-client -->
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>2.9.2</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-hdfs -->
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-hdfs</artifactId>
            <version>2.9.2</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
### --- 为了便于控制程序运行打印的日志数量，需要在项目的src/main/resources目录下，
~~~     新建一个文件，命名为“log4j.properties”，文件内容：

log4j.rootLogger=INFO, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=target/spring.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n
### --- 创建包名：com.yanqi.hdfs
### --- 创建HdfsClient类

public class HdfsClient{

    @Test

    public void testMkdirs() throws IOException, InterruptedException, URISyntaxException {

        // 1 获取文件系统
        Configuration configuration = new Configuration();
        // 配置在集群上运行
        // configuration.set("fs.defaultFS", "hdfs://linux121:9000");
        // FileSystem fs = FileSystem.get(configuration);
        FileSystem fs = FileSystem.get(new URI("hdfs://linux121:9000"),configuration, "root");
        // 2 创建目录
        fs.mkdirs(new Path("/test"));
        // 3 关闭资源
        fs.close();
    }
}
### --- 遇到问题：

~~~     如果不指定操作HDFS集群的用户信息，默认是获取当前操作系统的用户信息，
~~~     出现权限被拒绝的问题，报错如下：
三、编程语言
### --- 方案一：获取filesystem对象
### --- 编程代码

package com.yanqi.hdfs;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.junit.Test;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;


public class HdfsClientDemo {
    @Test
    public void testMkdirs() throws URISyntaxException, IOException, InterruptedException {
        //1、获取Hadoop集群的configuration对象
        Configuration configuration = new Configuration();

        //2、根据configuration获取Filesystem对象
        FileSystem fs = FileSystem.get(new URI("hdfs://linux121:9000"), configuration, "root");

        //3、使用filesystem对象创建一个测试
        fs.mkdirs(new Path("/api_test"));
        //4、释放filesystem对象(类似数据库连接)
        fs.close();
    }
}
### --- 打印输出

D:\JAVA\jdk1.8.0_231\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=64249:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath "D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar;D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\plugins\junit\lib\junit5-rt.jar;D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\plugins\junit\lib\junit-rt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\charsets.jar;D:\JAVA\jdk1.8.0_231\jre\lib\deploy.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\access-bridge-64.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\cldrdata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\dnsns.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jaccess.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jfxrt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\localedata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\nashorn.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunec.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunjce_provider.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunmscapi.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunpkcs11.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\zipfs.jar;D:\JAVA\jdk1.8.0_231\jre\lib\javaws.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jce.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfr.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfxswt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jsse.jar;D:\JAVA\jdk1.8.0_231\jre\lib\management-agent.jar;D:\JAVA\jdk1.8.0_231\jre\lib\plugin.jar;D:\JAVA\jdk1.8.0_231\jre\lib\resources.jar;D:\JAVA\jdk1.8.0_231\jre\lib\rt.jar;E:\NO.Z.10000——javaproject\NO.Z.00002.Hadoop\client_demo\target\classes;C:\Users\Administrator\.m2\repository\junit\junit\4.13.2\junit-4.13.2.jar;C:\Users\Administrator\.m2\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-core\2.8.2\log4j-core-2.8.2.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-api\2.8.2\log4j-api-2.8.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-common\2.9.2\hadoop-common-2.9.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-annotations\2.9.2\hadoop-annotations-2.9.2.jar;C:\Users\Administrator\.m2\repository\com\google\guava\guava\11.0.2\guava-11.0.2.jar;C:\Users\Administrator\.m2\repository\commons-cli\commons-cli\1.2\commons-cli-1.2.jar;C:\Users\Administrator\.m2\repository\org\apache\commons\commons-math3\3.1.1\commons-math3-3.1.1.jar;C:\Users\Administrator\.m2\repository\xmlenc\xmlenc\0.52\xmlenc-0.52.jar;C:\Users\Administrator\.m2\repository\org\apache\httpcomponents\httpclient\4.5.2\httpclient-4.5.2.jar;C:\Users\Administrator\.m2\repository\org\apache\httpcomponents\httpcore\4.4.4\httpcore-4.4.4.jar;C:\Users\Administrator\.m2\repository\commons-codec\commons-codec\1.4\commons-codec-1.4.jar;C:\Users\Administrator\.m2\repository\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Administrator\.m2\repository\commons-net\commons-net\3.1\commons-net-3.1.jar;C:\Users\Administrator\.m2\repository\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;C:\Users\Administrator\.m2\repository\javax\servlet\servlet-api\2.5\servlet-api-2.5.jar;C:\Users\Administrator\.m2\repository\org\mortbay\jetty\jetty\6.1.26\jetty-6.1.26.jar;C:\Users\Administrator\.m2\repository\org\mortbay\jetty\jetty-util\6.1.26\jetty-util-6.1.26.jar;C:\Users\Administrator\.m2\repository\org\mortbay\jetty\jetty-sslengine\6.1.26\jetty-sslengine-6.1.26.jar;C:\Users\Administrator\.m2\repository\javax\servlet\jsp\jsp-api\2.1\jsp-api-2.1.jar;C:\Users\Administrator\.m2\repository\com\sun\jersey\jersey-core\1.9\jersey-core-1.9.jar;C:\Users\Administrator\.m2\repository\com\sun\jersey\jersey-json\1.9\jersey-json-1.9.jar;C:\Users\Administrator\.m2\repository\org\codehaus\jettison\jettison\1.1\jettison-1.1.jar;C:\Users\Administrator\.m2\repository\com\sun\xml\bind\jaxb-impl\2.2.3-1\jaxb-impl-2.2.3-1.jar;C:\Users\Administrator\.m2\repository\org\codehaus\jackson\jackson-jaxrs\1.8.3\jackson-jaxrs-1.8.3.jar;C:\Users\Administrator\.m2\repository\org\codehaus\jackson\jackson-xc\1.8.3\jackson-xc-1.8.3.jar;C:\Users\Administrator\.m2\repository\com\sun\jersey\jersey-server\1.9\jersey-server-1.9.jar;C:\Users\Administrator\.m2\repository\asm\asm\3.1\asm-3.1.jar;C:\Users\Administrator\.m2\repository\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Administrator\.m2\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar;C:\Users\Administrator\.m2\repository\net\java\dev\jets3t\jets3t\0.9.0\jets3t-0.9.0.jar;C:\Users\Administrator\.m2\repository\com\jamesmurty\utils\java-xmlbuilder\0.4\java-xmlbuilder-0.4.jar;C:\Users\Administrator\.m2\repository\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;C:\Users\Administrator\.m2\repository\commons-configuration\commons-configuration\1.6\commons-configuration-1.6.jar;C:\Users\Administrator\.m2\repository\commons-digester\commons-digester\1.8\commons-digester-1.8.jar;C:\Users\Administrator\.m2\repository\commons-beanutils\commons-beanutils\1.7.0\commons-beanutils-1.7.0.jar;C:\Users\Administrator\.m2\repository\commons-beanutils\commons-beanutils-core\1.8.0\commons-beanutils-core-1.8.0.jar;C:\Users\Administrator\.m2\repository\org\apache\commons\commons-lang3\3.4\commons-lang3-3.4.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-log4j12\1.7.25\slf4j-log4j12-1.7.25.jar;C:\Users\Administrator\.m2\repository\o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rsey-client-1.9.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-mapreduce-client-jobclient\2.9.2\hadoop-mapreduce-client-jobclient-2.9.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-hdfs\2.9.2\hadoop-hdfs-2.9.2.jar;C:\Users\Administrator\.m2\repository\commons-daemon\commons-daemon\1.0.13\commons-daemon-1.0.13.jar;C:\Users\Administrator\.m2\repository\io\netty\netty\3.6.2.Final\netty-3.6.2.Final.jar;C:\Users\Administrator\.m2\repository\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar;C:\Users\Administrator\.m2\repository\xerces\xercesImpl\2.9.1\xercesImpl-2.9.1.jar;C:\Users\Administrator\.m2\repository\xml-apis\xml-apis\1.3.04\xml-apis-1.3.04.jar;C:\Users\Administrator\.m2\repository\org\fusesource\leveldbjni\leveldbjni-all\1.8\leveldbjni-all-1.8.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.7.8\jackson-databind-2.7.8.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.7.0\jackson-annotations-2.7.0.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.7.8\jackson-core-2.7.8.jar" com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit4 com.yanqi.hdfs.HdfsClientDemo

Process finished with exit code 0
### --- 报错现象：

~~~     windows解压安装Hadoop后，在调用相关API操作HDFS集群时可能会报错，
~~~     这是由于Hadoop安装缺少windows操作系统相关文件所致，如下图：
### --- 解决方案：

~~~     从资料文件夹中找到winutils.exe拷贝放到windows系统Hadoop安装目录的bin目录下即可！！
四、编程语言
### --- 方法二：获取filesystem对象

package com.yanqi.hdfs;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.junit.Test;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;


public class HdfsClientDemo {
    @Test
    public void testMkdirs() throws URISyntaxException, IOException, InterruptedException {
        //1、获取Hadoop集群的configuration对象
        Configuration configuration = new Configuration();
        configuration.set("fs.defaultFS","hdfs://linux121:9000");

        //2、根据configuration获取Filesystem对象
        //FileSystem fs = FileSystem.get(new URI("hdfs://linux121:9000"), configuration, "root");

        FileSystem fs  = FileSystem.get(configuration);
        //3、使用filesystem对象创建一个测试
        fs.mkdirs(new Path("/api_test1"));
        //4、释放filesystem对象(类似数据库连接)
        fs.close();
    }
}
### --- 打印输出

D:\JAVA\jdk1.8.0_231\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=64299:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath "D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar;D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\plugins\junit\lib\junit5-rt.jar;D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\plugins\junit\lib\junit-rt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\charsets.jar;D:\JAVA\jdk1.8.0_231\jre\lib\deploy.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\access-bridge-64.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\cldrdata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\dnsns.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jaccess.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jfxrt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\localedata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\nashorn.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunec.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunjce_provider.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunmscapi.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunpkcs11.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\zipfs.jar;D:\JAVA\jdk1.8.0_231\jre\lib\javaws.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jce.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfr.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfxswt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jsse.jar;D:\JAVA\jdk1.8.0_231\jre\lib\management-agent.jar;D:\JAVA\jdk1.8.0_231\jre\lib\plugin.jar;D:\JAVA\jdk1.8.0_231\jre\lib\resources.jar;D:\JAVA\jdk1.8.0_231\jre\lib\rt.jar;E:\NO.Z.10000——javaproject\NO.Z.00002.Hadoop\client_demo\target\classes;C:\Users\Administrator\.m2\repository\junit\junit\4.13.2\junit-4.13.2.jar;C:\Users\Administrator\.m2\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-core\2.8.2\log4j-core-2.8.2.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-api\2.8.2\log4j-api-2.8.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-common\2.9.2\hadoop-common-2.9.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-annotations\2.9.2\hadoop-annotations-2.9.2.jar;C:\Users\Administrator\.m2\repository\com\google\guava\guava\11.0.2\guava-11.0.2.jar;C:\Users\Administrator\.m2\repository\commons-cli\commons-cli\1.2\commons-cli-1.2.jar;C:\Users\Administrator\.m2\repository\org\apache\commons\commons-math3\3.1.1\commons-math3-3.1.1.jar;C:\Users\Administrator\.m2\repository\xmlenc\xmlenc\0.52\xmlenc-0.52.jar;C:\Users\Administrator\.m2\repository\org\apache\httpcomponents\httpclient\4.5.2\httpclient-4.5.2.jar;C:\Users\Administrator\.m2\repository\org\apache\httpcomponents\httpcore\4.4.4\httpcore-4.4.4.jar;C:\Users\Administrator\.m2\repository\commons-codec\commons-codec\1.4\commons-codec-1.4.jar;C:\Users\Administrator\.m2\repository\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Administrator\.m2\repository\commons-net\commons-net\3.1\commons-net-3.1.jar;C:\Users\Administrator\.m2\repository\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;C:\Users\Administrator\.m2\repository\javax\servlet\servlet-api\2.5\servlet-api-2.5.jar;C:\Users\Administrator\.m2\repository\org\mortbay\jetty\jetty\6.1.26\jetty-6.1.26.jar;C:\Users\Administrator\.m2\repository\org\mortbay\jetty\jetty-util\6.1.26\jetty-util-6.1.26.jar;C:\Users\Administrator\.m2\repository\org\mortbay\jetty\jetty-sslengine\6.1.26\jetty-sslengine-6.1.26.jar;C:\Users\Administrator\.m2\repository\javax\servlet\jsp\jsp-api\2.1\jsp-api-2.1.jar;C:\Users\Administrator\.m2\repository\com\sun\jersey\jersey-core\1.9\jersey-core-1.9.jar;C:\Users\Administrator\.m2\repository\com\sun\jersey\jersey-json\1.9\jersey-json-1.9.jar;C:\Users\Administrator\.m2\repository\org\codehaus\jettison\jettison\1.1\jettison-1.1.jar;C:\Users\Administrator\.m2\repository\com\sun\xml\bind\jaxb-impl\2.2.3-1\jaxb-impl-2.2.3-1.jar;C:\Users\Administrator\.m2\repository\org\codehaus\jackson\jackson-jaxrs\1.8.3\jackson-jaxrs-1.8.3.jar;C:\Users\Administrator\.m2\repository\org\codehaus\jackson\jackson-xc\1.8.3\jackson-xc-1.8.3.jar;C:\Users\Administrator\.m2\repository\com\sun\jersey\jersey-server\1.9\jersey-server-1.9.jar;C:\Users\Administrator\.m2\repository\asm\asm\3.1\asm-3.1.jar;C:\Users\Administrator\.m2\repository\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Administrator\.m2\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar;C:\Users\Administrator\.m2\repository\net\java\dev\jets3t\jets3t\0.9.0\jets3t-0.9.0.jar;C:\Users\Administrator\.m2\repository\com\jamesmurty\utils\java-xmlbuilder\0.4\java-xmlbuilder-0.4.jar;C:\Users\Administrator\.m2\repository\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;C:\Users\Administrator\.m2\repository\commons-configuration\commons-configuration\1.6\commons-configuration-1.6.jar;C:\Users\Administrator\.m2\repository\commons-digester\commons-digester\1.8\commons-digester-1.8.jar;C:\Users\Administrator\.m2\repository\commons-beanutils\commons-beanutils\1.7.0\commons-beanutils-1.7.0.jar;C:\Users\Administrator\.m2\repository\commons-beanutils\commons-beanutils-core\1.8.0\commons-beanutils-core-1.8.0.jar;C:\Users\Administrator\.m2\repository\org\apache\commons\commons-lang3\3.4\commons-lang3-3.4.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-log4j12\1.7.25\slf4j-log4j12-1.7.25.jar;C:\Users\Administrator\.m2\repository\org\codehaus\jackson\jackson-core-asl\1.9.13\jackson-core-asl-1.9.13.jar;C:\Users\Administrator\.m2\repository\org\codehaus\jackson\jackson-mapper-asl\1.9.13\jackson-mapper-asl-1.9.13.jar;C:\Users\Administrator\.m2\repository\org\apache\avro\avro\1.7.7\avro-1.7.7.jar;C:\Users\Administrator\.m2\repository\com\thoughtworks\paranamer\paranamer\2.3\paranamer-2.3.jar;C:\Users\Administrator\.m2\repository\org\xerial\snappy\snappy-java\1.0.5\snappy-java-1.0.5.jar;C:\Users\Administrator\.m2\repository\com\google\protobuf\protobuf-java\2.5.0\protobuf-java-2.5.0.jar;C:\Users\Administrator\.m2\repository\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-auth\2.9.2\hadoop-auth-2.9.2.jar;C:\Users\Administrator\.m2\repository\com\nimbusds\nimbus-jose-jwt\4.41.1\nimbus-jose-jwt-4.41.1.jar;C:\Users\Administrator\.m2\repository\com\github\stephenc\jcip\jcip-annotations\1.0-1\jcip-annotations-1.0-1.jar;C:\Users\Administrator\.m2\repository\net\minidev\json-smart\2.3\json-smart-2.3.jar;C:\Users\Administrator\.m2\repository\net\minidev\accessors-smart\1.2\accessors-smart-1.2.jar;C:\Users\Administrator\.m2\repository\org\ow2\asm\asm\5.0.4\asm-5.0.4.jar;C:\Users\Administrator\.m2\repository\org\apache\directory\server\apacheds-kerberos-codec\2.0.0-M15\apacheds-kerberos-codec-2.0.0-M15.jar;C:\Users\Administrator\.m2\repository\org\apache\directory\server\apacheds-i18n\2.0.0-M15\apacheds-i18n-2.0.0-M15.jar;C:\Users\Administrator\.m2\repository\org\apache\directory\api\api-asn1-api\1.0.0-M20\api-asn1-api-1.0.0-M20.jar;C:\Users\Administrator\.m2\repository\org\apache\directory\api\api-util\1.0.0-M20\api-util-1.0.0-M20.jar;C:\Users\Administrator\.m2\repository\org\apache\curator\curator-framework\2.7.1\curator-framework-2.7.1.jar;C:\Users\Administrator\.m2\repository\com\jcraft\jsch\0.1.54\jsch-0.1.54.jar;C:\Users\Administrator\.m2\repository\org\apache\curator\curator-client\2.7.1\curator-client-2.7.1.jar;C:\Users\Administrator\.m2\repository\org\apache\curator\curator-recipes\2.7.1\curator-recipes-2.7.1.jar;C:\Users\Administrator\.m2\repository\com\google\code\findbugs\jsr305\3.0.0\jsr305-3.0.0.jar;C:\Users\Administrator\.m2\repository\org\apache\htrace\htrace-core4\4.1.0-incubating\htrace-core4-4.1.0-incubating.jar;C:\Users\Administrator\.m2\repository\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;C:\Users\Administrator\.m2\repository\org\apache\commons\commons-compress\1.4.1\commons-compress-1.4.1.jar;C:\Users\Administrator\.m2\repository\org\tukaani\xz\1.0\xz-1.0.jar;C:\Users\Administrator\.m2\repository\org\codehaus\woodstox\stax2-api\3.1.4\stax2-api-3.1.4.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\woodstox\woodstox-core\5.0.3\woodstox-core-5.0.3.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-client\2.9.2\hadoop-client-2.9.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-hdfs-client\2.9.2\hadoop-hdfs-client-2.9.2.jar;C:\Users\Administrator\.m2\repository\com\squareup\okhttp\okhttp\2.7.5\okhttp-2.7.5.jar;C:\Users\Administrator\.m2\repository\com\squareup\okio\okio\1.6.0\okio-1.6.0.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-mapreduce-client-app\2.9.2\hadoop-mapreduce-client-app-2.9.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-mapreduce-client-common\2.9.2\hadoop-mapreduce-client-common-2.9.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-mapreduce-client-shuffle\2.9.2\hadoop-mapreduce-client-shuffle-2.9.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-yarn-server-common\2.9.2\hadoop-yarn-server-common-2.9.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-yarn-registry\2.9.2\hadoop-yarn-registry-2.9.2.jar;C:\Users\Administrator\.m2\repository\org\apache\geronimo\specs\geronimo-jcache_1.0_spec\1.0-alpha-1\geronimo-jcache_1.0_spec-1.0-alpha-1.jar;C:\Users\Administrator\.m2\repository\org\ehcache\ehcache\3.3.1\ehcache-3.3.1.jar;C:\Users\Administrator\.m2\repository\com\zaxxer\HikariCP-java7\2.4.12\HikariCP-java7-2.4.12.jar;C:\Users\Administrator\.m2\repository\com\microsoft\sqlserver\mssql-jdbc\6.2.1.jre7\mssql-jdbc-6.2.1.jre7.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-yarn-api\2.9.2\hadoop-yarn-api-2.9.2.jar;C:\Users\Administrator\.m2\repository\javax\xml\bind\jaxb-api\2.2.2\jaxb-api-2.2.2.jar;C:\Users\Administrator\.m2\repository\javax\xml\stream\stax-api\1.0-2\stax-api-1.0-2.jar;C:\Users\Administrator\.m2\repository\javax\activation\activation\1.1\activation-1.1.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-mapreduce-client-core\2.9.2\hadoop-mapreduce-client-core-2.9.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-yarn-client\2.9.2\hadoop-yarn-client-2.9.2.jar;C:\Users\Administrator\.m2\repository\org\apache\hadoop\hadoop-yarn-common\2.9.2\hadoop-yarn-common-2.9.2.jar;C:\Users\Administrator\.m2\repository\com\sun\jersey\jersey-client\1.9\je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com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit4 com.yanqi.hdfs.HdfsClientDemo,testMkdirs

Process finished with exit code 0
### --- 报错现象：

~~~     # HDFS文件系统权限问题
~~~     hdfs的文件权限机制与linux系统的文件权限机制类似！！
~~~     r:read w:write x:execute 权限x对于文件表示忽略，对于文件夹表示是否有权限访问其内容
~~~     如果linux系统用户zhangsan使用hadoop命令创建一个文件，那么这个文件在HDFS当中的owner就是zhangsan
~~~     HDFS文件权限的目的，防止好人做错事，而不是阻止坏人做坏事。HDFS相信你告诉我你是谁，你就是谁！！
### --- 解决方案：
~~~     # 方案一：指定用户信息获取FileSystem对象
~~~     # 方案二：关闭HDFS集群权限校验

vim hdfs-site.xml
# 添加如下属性
<property>
                <name>dfs.permissions</name>
                <value>true</value>
</property>
~~~     # 方案三：

~~~     修改完成之后要分发到其它节点，同时要重启HDFS集群
~~~     基于HDFS权限本身比较鸡肋的特点，我们可以彻底放弃HDFS的权限校验，
~~~     如果生产环境中我们可以考虑借助kerberos以及sentry等安全框架来管理大数据集群安全。
~~~     所以我们直接修改HDFS的根目录权限为777
[root@linux121 ~]# hadoop fs -chmod -R 777 /
五、编程语言
### --- 方法三：获取filesystem对象

package com.yanqi.hdfs;


import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.util.Progressable;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;

public class HdfsClientDemo {
    FileSystem fs = null;

    @Before
    public void init() throws URISyntaxException, IOException, InterruptedException {
        //1、获取Hadoop集群的configuration对象
        Configuration configuration = new Configuration();
        configuration.set( "fs.defaultFS", "hdfs://linux121:9000" );


        //2、根据configuration获取Filesystem对象
        fs = FileSystem.get( new URI( "hdfs://linux121:9000" ), configuration, "root" );
    }


    @After
    public void destory() throws IOException {
        //4、释放filesystem对象(类似数据库连接)
        fs.close();
    }

    @Test
    public void testMkdirs() throws URISyntaxException, IOException, InterruptedException {


        //FileSystem fs  = FileSystem.get(configuration);
        //3、使用filesystem对象创建一个测试
        fs.mkdirs( new Path( "/api_test2" ) );
    }
}
### --- 编译打印

D:\JAVA\jdk1.8.0_231\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=58653:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath "D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar;D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\plugins\junit\lib\junit5-rt.jar;D:\IntelliJIDEA\IntelliJ IDEA 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com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit4 com.yanqi.hdfs.HdfsClientDemo,testMkdirs

Process finished with exit code 0
 
 
 
 
 
 
 
 
 
Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart
                                                                                                                                                   ——W.S.Landor
 

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