文章目錄

一、HDFS 準備客戶端環境

根據自己電腦的操作系統拷貝對應的編譯後的hadoop jar包到非中文路徑
配置環境變量
創建一個 Maven工程

不會的同學請看這篇博客

導入相應的依賴座標+日誌添加

<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>
		<dependency>
			<groupId>org.apache.hadoop</groupId>
			<artifactId>hadoop-common</artifactId>
			<version>2.7.2</version>
		</dependency>
		<dependency>
			<groupId>org.apache.hadoop</groupId>
			<artifactId>hadoop-client</artifactId>
			<version>2.7.2</version>
		</dependency>
		<dependency>
			<groupId>org.apache.hadoop</groupId>
			<artifactId>hadoop-hdfs</artifactId>
			<version>2.7.2</version>
		</dependency>
		<dependency>
			<groupId>jdk.tools</groupId>
			<artifactId>jdk.tools</artifactId>
			<version>1.8</version>
			<scope>system</scope>
			<systemPath>${JAVA_HOME}/lib/tools.jar</systemPath>
		</dependency>
</dependencies>

說明: 如果有同學的jar包下載不成功, 把對應的 pom 依賴刪掉, 再撤銷試試

注意：如果Eclipse/Idea打印不出日誌，在控制檯上只顯示

log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

需要在項目的 src/main/resources 目錄下，新建一個文件，命名爲 “log4j.properties”，在文件中填入

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

創建 com.kino.hdfs.HdfsClient 類

public class HdfsClient {

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

        Configuration conf = new Configuration();

        // 1. 獲取 hdfs 客戶端對象
        //get() 三個參數:
        //      1.HDFS的 NameNode的地址, 和 core-site.xml 文件中聲明的一致;
        //      2. Configuration 對象;
        //      3. 用戶名;
        FileSystem fs = FileSystem.get(new URI("hdfs://hadoop102:9000"), conf, "kino");

        // 2. 在 hdfs 上創建路徑
        fs.mkdirs(new Path("/user/kino/idea"));

        // 3. 關閉資源
        fs.close();
        System.out.println("over....");

	 }
}

運行成功後：

瀏覽器中查看, 已經有了對應文件

二、 HDFS 的 API 操作

常用的 API 方法名與 HDFS 的Shell操作基本一致

說明：
爲了方便，將 Configuration conf 和 FileSystem fs 的獲取寫在了 @before中; 將 FileSystem fs 的關閉寫在了 @after 中, 代碼如下:

private Configuration conf;

private FileSystem fs;

@Before
public void beforeMethod() throws IOException, InterruptedException, URISyntaxException {
    conf = new Configuration();
    //設置參數優先級
    conf.set("dfs.replication", "2");
    fs = FileSystem.get(new URI("hdfs://hadoop102:9000"), conf, "kino");
}

@After
public void afterMethod() throws IOException {
    fs.close();
}

2.1 HDFS 的文件上傳（測試參數優先級）

java 代碼

@Test
public void testCopyFromLocalFile() throws IOException {
     //copyFromLocalFile 兩個參數: 本地文件路徑, HDFS 文件路徑
     fs.copyFromLocalFile(new Path("D:/Hadoop_Test.txt"), new Path("/user/kino/idea"));
     System.out.println("over...");
}

將 Linux 中 /opt/module/hadoop-2.7.2/etc/hadoop/hdfs-site.xml 複製到根目錄下

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
	
<configuration>
        <!-- 指定HDFS副本的數量 -->
        <property>
                <name>dfs.replication</name>
                <value>1</value>
        </property>
</configuration>

運行

在 @before 方法中增加：

//設置參數優先級
conf.set("dfs.replication", "2");

再次運行

總結: 客戶端代碼中設置的值 > ClassPath下的用戶自定義配置文件 > 然後是服務器的默認配置

2.2 HDFS 的文件下載

//下載文件
@Test
public void testCopyToLocalFile() throws IOException {

    // 執行下載操作
    // boolean delSrc 指是否將原文件刪除
    // Path src 指要下載的文件路徑
    // Path dst 指將文件下載到的路徑
    fs.copyToLocalFile(false, new Path("/user/kino/idea/Hadoop_Test.txt"), new Path("D:\\Hadoop_Test_HDFS.txt"));

    // 3 關閉資源
    fs.close();
}

打開D盤，發現下載下來的內容如下:

可以看到我們想要下載一個txt文件, 卻多了一個 crc 文件, 是什麼原因導致的呢, 去源碼看看到底是什麼操作:

public void copyToLocalFile(boolean delSrc, Path src, Path dst) throws IOException {
    copyToLocalFile(delSrc, src, dst, false);
}

可以看到 copyToLocalFile 方法調用了另一個重載的方法，並且將最後一個參數設置成了 false，我們繼續跟進去看看

 /**
   * The src file is under FS, and the dst is on the local disk. Copy it from FS
   * control to the local dst name. delSrc indicates if the src will be removed
   * or not. useRawLocalFileSystem indicates whether to use RawLocalFileSystem
   * as local file system or not. RawLocalFileSystem is non crc file system.So,
   * It will not create any crc files at local.
   * 
   * @param delSrc
   *          whether to delete the src
   * @param src
   *          path
   * @param dst
   *          path
   * @param useRawLocalFileSystem
   *          whether to use RawLocalFileSystem as local file system or not.
   * 
   * @throws IOException
   *           - if any IO error
   */
public void copyToLocalFile(boolean delSrc, Path src, Path dst,
      boolean useRawLocalFileSystem) throws IOException {
    Configuration conf = getConf();
    FileSystem local = null;
    if (useRawLocalFileSystem) {
      local = getLocal(conf).getRawFileSystem();
    } else {
      local = getLocal(conf);
    }
    FileUtil.copy(this, src, local, dst, delSrc, conf);
}

關於最後一個參數, 方法上有註釋說明，問我們是否用關閉 crc 校驗: whether to use RawLocalFileSystem as local file system or not.:

爲了避免 crc文件的出現，我們乾脆調用 public void copyToLocalFile(boolean delSrc, Path src, Path dst, boolean useRawLocalFileSystem) 好了，調用時將最後一個參數設置爲 true, 此時再次下載, crc 文件沒有再出現
fs.copyToLocalFile(false, new Path("/user/kino/idea/Hadoop_Test.txt"), new Path("D:\\Hadoop_Test_HDFS.txt"), true);

2.3 HDFS 的文件夾刪除

//文件夾的刪除
@Test
public void testDelete() throws IOException, InterruptedException, URISyntaxException{

    // 第二個參數: 遞歸刪除
    fs.delete(new Path("/user/kino/test/"), true);

}

2.4 HDFS更改文件名

//HDFS 文件名更改
@Test
public void testRename() throws IOException, InterruptedException, URISyntaxException{
    //第一個參數: 原文件,  第二個參數: 將要換乘的名稱
    fs.rename(new Path("/user/kino/idea/Hadoop_Test.txt"), new Path("/user/kino/Hadoop_Test_rename.txt"));
}

代碼中不進針對了文件名的修改, 還改變了文件的路徑, 實際上此功能相當於 HDFS的 -mv 操作

2.5 HDFS文件詳情查看

查看文件名稱、權限、長度、塊信息

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

    // 獲取文件詳情
    RemoteIterator<LocatedFileStatus> listFiles = fs.listFiles(new Path("/"), true);

    while (listFiles.hasNext()) {
        LocatedFileStatus status = listFiles.next();

        // 輸出詳情
        // 文件名稱
        System.out.println(status.getPath().getName());
        // 長度
        System.out.println(status.getLen());
        // 權限
        System.out.println(status.getPermission());
        // 分組
        System.out.println(status.getGroup());

        // 獲取存儲的塊信息
        BlockLocation[] blockLocations = status.getBlockLocations();

        for (BlockLocation blockLocation : blockLocations) {

            // 獲取塊存儲的主機節點
            String[] hosts = blockLocation.getHosts();

            for (String host : hosts) {
                System.out.println(host);
            }
        }

        System.out.println("---------------------");
    }

    // 3 關閉資源
    fs.close();
}

輸出結果:

D:\SoftWare\eclipse\1.8_verson131\JDK\path\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:D:\SoftWare\idea\path\IntelliJ IDEA 2019.1.3\lib\idea_rt.jar=51776:D:\SoftWare\idea\path\IntelliJ IDEA 2019.1.3\bin" -Dfile.encoding=UTF-8 -classpath "D:\SoftWare\idea\path\IntelliJ IDEA 2019.1.3\lib\idea_rt.jar;D:\SoftWare\idea\path\IntelliJ IDEA 2019.1.3\plugins\junit\lib\junit-rt.jar;D:\SoftWare\idea\path\IntelliJ IDEA 2019.1.3\plugins\junit\lib\junit5-rt.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\charsets.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\deploy.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\access-bridge-64.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\cldrdata.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\dnsns.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\jaccess.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\jfxrt.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\localedata.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\nashorn.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\sunec.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\sunjce_provider.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\sunmscapi.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\sunpkcs11.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\zipfs.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\javaws.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\jce.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\jfr.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\jfxswt.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\jsse.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\management-agent.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\plugin.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\resources.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\rt.jar;D:\Work\idea\WorkSpace\Hadoop01\src\main\webapp\WEB-INF\classes;D:\SoftWare\Maven\libs\junit\junit\4.13-beta-3\junit-4.13-beta-3.jar;D:\SoftWare\Maven\libs\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;D:\SoftWare\Maven\libs\org\apache\logging\log4j\log4j-core\2.8.2\log4j-core-2.8.2.jar;D:\SoftWare\Maven\libs\org\apache\logging\log4j\log4j-api\2.8.2\log4j-api-2.8.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-common\2.7.2\hadoop-common-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-annotations\2.7.2\hadoop-annotations-2.7.2.jar;D:\SoftWare\Maven\libs\com\google\guava\guava\11.0.2\guava-11.0.2.jar;D:\SoftWare\Maven\libs\commons-cli\commons-cli\1.2\commons-cli-1.2.jar;D:\SoftWare\Maven\libs\org\apache\commons\commons-math3\3.1.1\commons-math3-3.1.1.jar;D:\SoftWare\Maven\libs\xmlenc\xmlenc\0.52\xmlenc-0.52.jar;D:\SoftWare\Maven\libs\commons-httpclient\commons-httpclient\3.1\commons-httpclient-3.1.jar;D:\SoftWare\Maven\libs\commons-codec\commons-codec\1.4\commons-codec-1.4.jar;D:\SoftWare\Maven\libs\commons-io\commons-io\2.4\commons-io-2.4.jar;D:\SoftWare\Maven\libs\commons-net\commons-net\3.1\commons-net-3.1.jar;D:\SoftWare\Maven\libs\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;D:\SoftWare\Maven\libs\javax\servlet\servlet-api\2.5\servlet-api-2.5.jar;D:\SoftWare\Maven\libs\org\mortbay\jetty\jetty\6.1.26\jetty-6.1.26.jar;D:\SoftWare\Maven\libs\org\mortbay\jetty\jetty-util\6.1.26\jetty-util-6.1.26.jar;D:\SoftWare\Maven\libs\javax\servlet\jsp\jsp-api\2.1\jsp-api-2.1.jar;D:\SoftWare\Maven\libs\com\sun\jersey\jersey-core\1.9\jersey-core-1.9.jar;D:\SoftWare\Maven\libs\com\sun\jersey\jersey-json\1.9\jersey-json-1.9.jar;D:\SoftWare\Maven\libs\org\codehaus\jettison\jettison\1.1\jettison-1.1.jar;D:\SoftWare\Maven\libs\com\sun\xml\bind\jaxb-impl\2.2.3-1\jaxb-impl-2.2.3-1.jar;D:\SoftWare\Maven\libs\javax\xml\bind\jaxb-api\2.2.2\jaxb-api-2.2.2.jar;D:\SoftWare\Maven\libs\javax\xml\stream\stax-api\1.0-2\stax-api-1.0-2.jar;D:\SoftWare\Maven\libs\javax\activation\activation\1.1\activation-1.1.jar;D:\SoftWare\Maven\libs\org\codehaus\jackson\jackson-jaxrs\1.8.3\jackson-jaxrs-1.8.3.jar;D:\SoftWare\Maven\libs\org\codehaus\jackson\jackson-xc\1.8.3\jackson-xc-1.8.3.jar;D:\SoftWare\Maven\libs\com\sun\jersey\jersey-server\1.9\jersey-server-1.9.jar;D:\SoftWare\Maven\libs\asm\asm\3.1\asm-3.1.jar;D:\SoftWare\Maven\libs\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;D:\SoftWare\Maven\libs\log4j\log4j\1.2.17\log4j-1.2.17.jar;D:\SoftWare\Maven\libs\net\java\dev\jets3t\jets3t\0.9.0\jets3t-0.9.0.jar;D:\SoftWare\Maven\libs\org\apache\httpcomponents\httpclient\4.1.2\httpclient-4.1.2.jar;D:\SoftWare\Maven\libs\org\apache\httpcomponents\httpcore\4.1.2\httpcore-4.1.2.jar;D:\SoftWare\Maven\libs\com\jamesmurty\utils\java-xmlbuilder\0.4\java-xmlbuilder-0.4.jar;D:\SoftWare\Maven\libs\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;D:\SoftWare\Maven\libs\commons-configuration\commons-configuration\1.6\commons-configuration-1.6.jar;D:\SoftWare\Maven\libs\commons-digester\commons-digester\1.8\commons-digester-1.8.jar;D:\SoftWare\Maven\libs\commons-beanutils\commons-beanutils\1.7.0\commons-beanutils-1.7.0.jar;D:\SoftWare\Maven\libs\commons-beanutils\commons-beanutils-core\1.8.0\commons-beanutils-core-1.8.0.jar;D:\SoftWare\Maven\libs\org\slf4j\slf4j-api\1.7.10\slf4j-api-1.7.10.jar;D:\SoftWare\Maven\libs\org\slf4j\slf4j-log4j12\1.7.10\slf4j-log4j12-1.7.10.jar;D:\SoftWare\Maven\libs\org\codehaus\jackson\jackson-core-asl\1.9.13\jackson-core-asl-1.9.13.jar;D:\SoftWare\Maven\libs\org\codehaus\jackson\jackson-mapper-asl\1.9.13\jackson-mapper-asl-1.9.13.jar;D:\SoftWare\Maven\libs\org\apache\avro\avro\1.7.4\avro-1.7.4.jar;D:\SoftWare\Maven\libs\com\thoughtworks\paranamer\paranamer\2.3\paranamer-2.3.jar;D:\SoftWare\Maven\libs\org\xerial\snappy\snappy-java\1.0.4.1\snappy-java-1.0.4.1.jar;D:\SoftWare\Maven\libs\com\google\protobuf\protobuf-java\2.5.0\protobuf-java-2.5.0.jar;D:\SoftWare\Maven\libs\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-auth\2.7.2\hadoop-auth-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\directory\server\apacheds-kerberos-codec\2.0.0-M15\apacheds-kerberos-codec-2.0.0-M15.jar;D:\SoftWare\Maven\libs\org\apache\directory\server\apacheds-i18n\2.0.0-M15\apacheds-i18n-2.0.0-M15.jar;D:\SoftWare\Maven\libs\org\apache\directory\api\api-asn1-api\1.0.0-M20\api-asn1-api-1.0.0-M20.jar;D:\SoftWare\Maven\libs\org\apache\directory\api\api-util\1.0.0-M20\api-util-1.0.0-M20.jar;D:\SoftWare\Maven\libs\org\apache\curator\curator-framework\2.7.1\curator-framework-2.7.1.jar;D:\SoftWare\Maven\libs\com\jcraft\jsch\0.1.42\jsch-0.1.42.jar;D:\SoftWare\Maven\libs\org\apache\curator\curator-client\2.7.1\curator-client-2.7.1.jar;D:\SoftWare\Maven\libs\org\apache\curator\curator-recipes\2.7.1\curator-recipes-2.7.1.jar;D:\SoftWare\Maven\libs\com\google\code\findbugs\jsr305\3.0.0\jsr305-3.0.0.jar;D:\SoftWare\Maven\libs\org\apache\htrace\htrace-core\3.1.0-incubating\htrace-core-3.1.0-incubating.jar;D:\SoftWare\Maven\libs\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;D:\SoftWare\Maven\libs\org\apache\commons\commons-compress\1.4.1\commons-compress-1.4.1.jar;D:\SoftWare\Maven\libs\org\tukaani\xz\1.0\xz-1.0.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-client\2.7.2\hadoop-client-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-mapreduce-client-app\2.7.2\hadoop-mapreduce-client-app-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-mapreduce-client-common\2.7.2\hadoop-mapreduce-client-common-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-yarn-client\2.7.2\hadoop-yarn-client-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-yarn-server-common\2.7.2\hadoop-yarn-server-common-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-mapreduce-client-shuffle\2.7.2\hadoop-mapreduce-client-shuffle-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-yarn-api\2.7.2\hadoop-yarn-api-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-mapreduce-client-core\2.7.2\hadoop-mapreduce-client-core-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-yarn-common\2.7.2\hadoop-yarn-common-2.7.2.jar;D:\SoftWare\Maven\libs\com\sun\jersey\jersey-client\1.9\jersey-client-1.9.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-mapreduce-client-jobclient\2.7.2\hadoop-mapreduce-client-jobclient-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-hdfs\2.7.2\hadoop-hdfs-2.7.2.jar;D:\SoftWare\Maven\libs\commons-daemon\commons-daemon\1.0.13\commons-daemon-1.0.13.jar;D:\SoftWare\Maven\libs\io\netty\netty\3.6.2.Final\netty-3.6.2.Final.jar;D:\SoftWare\Maven\libs\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar;D:\SoftWare\Maven\libs\xerces\xercesImpl\2.9.1\xercesImpl-2.9.1.jar;D:\SoftWare\Maven\libs\xml-apis\xml-apis\1.3.04\xml-apis-1.3.04.jar;D:\SoftWare\Maven\libs\org\fusesource\leveldbjni\leveldbjni-all\1.8\leveldbjni-all-1.8.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\lib\tools.jar" com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit4 com.kino.hdfs.HdfsClient,testListFiles
log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Hadoop_Test_rename.txt
10
rw-r--r--
supergroup
hadoop103
hadoop104
---------------------
hadoop-2.7.2.tar.gz
197657687
rw-r--r--
supergroup
hadoop103
hadoop102
hadoop104
hadoop102
hadoop103
hadoop104
---------------------
kino.txt
21
rw-r--r--
supergroup
hadoop102
hadoop103
hadoop104
---------------------
LICENSE.txt
15429
rw-r--r--
supergroup
hadoop102
hadoop104
hadoop103
---------------------
kino.txt
21
rw-r--r--
kino
hadoop103
hadoop104
hadoop102
---------------------

2.6 HDFS 文件和文件夾的判斷

//文件和文件夾的判斷
@Test
public void testListStatus() throws IOException{
    printListStatus("/", fs);
}


public void printListStatus(String path, FileSystem fs) throws IOException{

    // 判斷是文件還是文件夾
    FileStatus[] listStatus = fs.listStatus(new Path(path));

    for (FileStatus fileStatus : listStatus) {

        // 如果是文件
        if (fileStatus.isFile()) {
            System.out.println("f:"+ path + "/" + fileStatus.getPath().getName());
        }else {
            String substring = fileStatus.getPath().toString().substring("hdfs://hadoop102:9000".length());
            printListStatus(substring, fs);
            System.out.println("d:"+substring + "/" + fileStatus.getPath().getName());
        }
    }
}

輸出結果:

D:\SoftWare\eclipse\1.8_verson131\JDK\path\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:D:\SoftWare\idea\path\IntelliJ IDEA 2019.1.3\lib\idea_rt.jar=51918:D:\SoftWare\idea\path\IntelliJ IDEA 2019.1.3\bin" -Dfile.encoding=UTF-8 -classpath "D:\SoftWare\idea\path\IntelliJ IDEA 2019.1.3\lib\idea_rt.jar;D:\SoftWare\idea\path\IntelliJ IDEA 2019.1.3\plugins\junit\lib\junit-rt.jar;D:\SoftWare\idea\path\IntelliJ IDEA 2019.1.3\plugins\junit\lib\junit5-rt.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\charsets.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\deploy.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\access-bridge-64.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\cldrdata.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\dnsns.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\jaccess.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\jfxrt.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\localedata.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\nashorn.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\sunec.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\sunjce_provider.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\sunmscapi.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\sunpkcs11.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\ext\zipfs.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\javaws.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\jce.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\jfr.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\jfxswt.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\jsse.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\management-agent.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\plugin.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\resources.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\jre\lib\rt.jar;D:\Work\idea\WorkSpace\Hadoop01\src\main\webapp\WEB-INF\classes;D:\SoftWare\Maven\libs\junit\junit\4.13-beta-3\junit-4.13-beta-3.jar;D:\SoftWare\Maven\libs\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;D:\SoftWare\Maven\libs\org\apache\logging\log4j\log4j-core\2.8.2\log4j-core-2.8.2.jar;D:\SoftWare\Maven\libs\org\apache\logging\log4j\log4j-api\2.8.2\log4j-api-2.8.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-common\2.7.2\hadoop-common-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-annotations\2.7.2\hadoop-annotations-2.7.2.jar;D:\SoftWare\Maven\libs\com\google\guava\guava\11.0.2\guava-11.0.2.jar;D:\SoftWare\Maven\libs\commons-cli\commons-cli\1.2\commons-cli-1.2.jar;D:\SoftWare\Maven\libs\org\apache\commons\commons-math3\3.1.1\commons-math3-3.1.1.jar;D:\SoftWare\Maven\libs\xmlenc\xmlenc\0.52\xmlenc-0.52.jar;D:\SoftWare\Maven\libs\commons-httpclient\commons-httpclient\3.1\commons-httpclient-3.1.jar;D:\SoftWare\Maven\libs\commons-codec\commons-codec\1.4\commons-codec-1.4.jar;D:\SoftWare\Maven\libs\commons-io\commons-io\2.4\commons-io-2.4.jar;D:\SoftWare\Maven\libs\commons-net\commons-net\3.1\commons-net-3.1.jar;D:\SoftWare\Maven\libs\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;D:\SoftWare\Maven\libs\javax\servlet\servlet-api\2.5\servlet-api-2.5.jar;D:\SoftWare\Maven\libs\org\mortbay\jetty\jetty\6.1.26\jetty-6.1.26.jar;D:\SoftWare\Maven\libs\org\mortbay\jetty\jetty-util\6.1.26\jetty-util-6.1.26.jar;D:\SoftWare\Maven\libs\javax\servlet\jsp\jsp-api\2.1\jsp-api-2.1.jar;D:\SoftWare\Maven\libs\com\sun\jersey\jersey-core\1.9\jersey-core-1.9.jar;D:\SoftWare\Maven\libs\com\sun\jersey\jersey-json\1.9\jersey-json-1.9.jar;D:\SoftWare\Maven\libs\org\codehaus\jettison\jettison\1.1\jettison-1.1.jar;D:\SoftWare\Maven\libs\com\sun\xml\bind\jaxb-impl\2.2.3-1\jaxb-impl-2.2.3-1.jar;D:\SoftWare\Maven\libs\javax\xml\bind\jaxb-api\2.2.2\jaxb-api-2.2.2.jar;D:\SoftWare\Maven\libs\javax\xml\stream\stax-api\1.0-2\stax-api-1.0-2.jar;D:\SoftWare\Maven\libs\javax\activation\activation\1.1\activation-1.1.jar;D:\SoftWare\Maven\libs\org\codehaus\jackson\jackson-jaxrs\1.8.3\jackson-jaxrs-1.8.3.jar;D:\SoftWare\Maven\libs\org\codehaus\jackson\jackson-xc\1.8.3\jackson-xc-1.8.3.jar;D:\SoftWare\Maven\libs\com\sun\jersey\jersey-server\1.9\jersey-server-1.9.jar;D:\SoftWare\Maven\libs\asm\asm\3.1\asm-3.1.jar;D:\SoftWare\Maven\libs\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;D:\SoftWare\Maven\libs\log4j\log4j\1.2.17\log4j-1.2.17.jar;D:\SoftWare\Maven\libs\net\java\dev\jets3t\jets3t\0.9.0\jets3t-0.9.0.jar;D:\SoftWare\Maven\libs\org\apache\httpcomponents\httpclient\4.1.2\httpclient-4.1.2.jar;D:\SoftWare\Maven\libs\org\apache\httpcomponents\httpcore\4.1.2\httpcore-4.1.2.jar;D:\SoftWare\Maven\libs\com\jamesmurty\utils\java-xmlbuilder\0.4\java-xmlbuilder-0.4.jar;D:\SoftWare\Maven\libs\commons-lang\commons-lang\2.6\commons-lang-2.6.jar;D:\SoftWare\Maven\libs\commons-configuration\commons-configuration\1.6\commons-configuration-1.6.jar;D:\SoftWare\Maven\libs\commons-digester\commons-digester\1.8\commons-digester-1.8.jar;D:\SoftWare\Maven\libs\commons-beanutils\commons-beanutils\1.7.0\commons-beanutils-1.7.0.jar;D:\SoftWare\Maven\libs\commons-beanutils\commons-beanutils-core\1.8.0\commons-beanutils-core-1.8.0.jar;D:\SoftWare\Maven\libs\org\slf4j\slf4j-api\1.7.10\slf4j-api-1.7.10.jar;D:\SoftWare\Maven\libs\org\slf4j\slf4j-log4j12\1.7.10\slf4j-log4j12-1.7.10.jar;D:\SoftWare\Maven\libs\org\codehaus\jackson\jackson-core-asl\1.9.13\jackson-core-asl-1.9.13.jar;D:\SoftWare\Maven\libs\org\codehaus\jackson\jackson-mapper-asl\1.9.13\jackson-mapper-asl-1.9.13.jar;D:\SoftWare\Maven\libs\org\apache\avro\avro\1.7.4\avro-1.7.4.jar;D:\SoftWare\Maven\libs\com\thoughtworks\paranamer\paranamer\2.3\paranamer-2.3.jar;D:\SoftWare\Maven\libs\org\xerial\snappy\snappy-java\1.0.4.1\snappy-java-1.0.4.1.jar;D:\SoftWare\Maven\libs\com\google\protobuf\protobuf-java\2.5.0\protobuf-java-2.5.0.jar;D:\SoftWare\Maven\libs\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-auth\2.7.2\hadoop-auth-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\directory\server\apacheds-kerberos-codec\2.0.0-M15\apacheds-kerberos-codec-2.0.0-M15.jar;D:\SoftWare\Maven\libs\org\apache\directory\server\apacheds-i18n\2.0.0-M15\apacheds-i18n-2.0.0-M15.jar;D:\SoftWare\Maven\libs\org\apache\directory\api\api-asn1-api\1.0.0-M20\api-asn1-api-1.0.0-M20.jar;D:\SoftWare\Maven\libs\org\apache\directory\api\api-util\1.0.0-M20\api-util-1.0.0-M20.jar;D:\SoftWare\Maven\libs\org\apache\curator\curator-framework\2.7.1\curator-framework-2.7.1.jar;D:\SoftWare\Maven\libs\com\jcraft\jsch\0.1.42\jsch-0.1.42.jar;D:\SoftWare\Maven\libs\org\apache\curator\curator-client\2.7.1\curator-client-2.7.1.jar;D:\SoftWare\Maven\libs\org\apache\curator\curator-recipes\2.7.1\curator-recipes-2.7.1.jar;D:\SoftWare\Maven\libs\com\google\code\findbugs\jsr305\3.0.0\jsr305-3.0.0.jar;D:\SoftWare\Maven\libs\org\apache\htrace\htrace-core\3.1.0-incubating\htrace-core-3.1.0-incubating.jar;D:\SoftWare\Maven\libs\org\apache\zookeeper\zookeeper\3.4.6\zookeeper-3.4.6.jar;D:\SoftWare\Maven\libs\org\apache\commons\commons-compress\1.4.1\commons-compress-1.4.1.jar;D:\SoftWare\Maven\libs\org\tukaani\xz\1.0\xz-1.0.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-client\2.7.2\hadoop-client-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-mapreduce-client-app\2.7.2\hadoop-mapreduce-client-app-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-mapreduce-client-common\2.7.2\hadoop-mapreduce-client-common-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-yarn-client\2.7.2\hadoop-yarn-client-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-yarn-server-common\2.7.2\hadoop-yarn-server-common-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-mapreduce-client-shuffle\2.7.2\hadoop-mapreduce-client-shuffle-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-yarn-api\2.7.2\hadoop-yarn-api-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-mapreduce-client-core\2.7.2\hadoop-mapreduce-client-core-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-yarn-common\2.7.2\hadoop-yarn-common-2.7.2.jar;D:\SoftWare\Maven\libs\com\sun\jersey\jersey-client\1.9\jersey-client-1.9.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-mapreduce-client-jobclient\2.7.2\hadoop-mapreduce-client-jobclient-2.7.2.jar;D:\SoftWare\Maven\libs\org\apache\hadoop\hadoop-hdfs\2.7.2\hadoop-hdfs-2.7.2.jar;D:\SoftWare\Maven\libs\commons-daemon\commons-daemon\1.0.13\commons-daemon-1.0.13.jar;D:\SoftWare\Maven\libs\io\netty\netty\3.6.2.Final\netty-3.6.2.Final.jar;D:\SoftWare\Maven\libs\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar;D:\SoftWare\Maven\libs\xerces\xercesImpl\2.9.1\xercesImpl-2.9.1.jar;D:\SoftWare\Maven\libs\xml-apis\xml-apis\1.3.04\xml-apis-1.3.04.jar;D:\SoftWare\Maven\libs\org\fusesource\leveldbjni\leveldbjni-all\1.8\leveldbjni-all-1.8.jar;D:\SoftWare\eclipse\1.8_verson131\JDK\path\lib\tools.jar" com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit4 com.kino.hdfs.HdfsClient,testListStatus
log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
f:/user/kino/Hadoop_Test_rename.txt
d:/user/kino/idea/idea
f:/user/kino/input/hadoop-2.7.2.tar.gz
f:/user/kino/input/kino.txt
d:/user/kino/input/input
f:/user/kino/test/LICENSE.txt
f:/user/kino/test/kino.txt
d:/user/kino/test/test
d:/user/kino/kino
d:/user/user

Process finished with exit code 0

五、HDFS 客戶端操作

文章目錄

一、HDFS 準備客戶端環境

二、 HDFS 的 API 操作

2.1 HDFS 的文件上傳（測試參數優先級）

2.2 HDFS 的文件下載

2.3 HDFS 的文件夾刪除

2.4 HDFS更改文件名

2.5 HDFS文件詳情查看

2.6 HDFS 文件和文件夾的判斷

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