大数据专栏
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1 在IDEA中安装Hadoop插件

插件下载地址
CSDN
GitHub
安装插件
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重启IDEA，菜单栏新增Hadoop

菜单栏Hadoop–设置，填写连接参数

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连接成功

每次更改文件，可能都需要以用户登录权限，比较麻烦。这个可以配置，在hdfs-site.xml来配置

<property>
	<name>dfs.permissions</name>
	<value>false</value>
</property>

2 操作虚拟机hdfs集群

2.1 创建Maven项目

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代码结构如下：

2.2 pom.xml添加依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.shane.hadoop</groupId>
    <artifactId>bigdata</artifactId>
    <version>1.0-SNAPSHOT</version>

    <repositories>
        <repository>
            <id>apache</id>
            <url>http://maven.apache.org</url>
        </repository>
    </repositories>

    <dependencies>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>2.7.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-common</artifactId>
            <version>2.7.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-hdfs</artifactId>
            <version>2.7.3</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-dependency-plugin</artifactId>
                <configuration>
                    <excludeTransitive>false</excludeTransitive>
                    <stripVersion>true</stripVersion>
                    <outputDirectory>./lib</outputDirectory>
                </configuration>

            </plugin>
        </plugins>
    </build>
</project>

2.3 编写测试连接代码

package com.shane.connect_hdfs;
import java.net.URI;

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

public class MyFirstHDFSDemo {
    public static void main(String[] args) throws Exception {
        URI uri = new URI("hdfs://192.168.65.101:9000/");
        Configuration conf = new Configuration();
        String user = "hadoop";
        FileSystem fs = FileSystem.get(uri,conf,user);

        fs.copyFromLocalFile(new Path("C:\\Users\\47463\\Desktop\\temp\\test.txt"), new Path("/"));
        //fs.copyFromLocalFile(new Path(args[0]), new Path(args[1]));
        boolean exist = fs.exists(new Path("/test.txt"));
        if(exist) {
            System.out.println("success");
        }else {
            System.out.println("failed");
        }
        fs.close();
    }
}