java测试kerberos(kdc)认证的hadoop集群的hdfs的读写

使用springboot，加可配置的参数来动态验证 java程序对于kerberos认证的hadoop集群访问，尤其是在初次使用java连接kerberos时，用户名，keytab文件等等问题

需要下载配置好的keytab文件与krb5.conf文件
在执行java的机器配置kerberos.example.com 执行运行 kerberos的机器(kdc)

//pom.xml
<?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.ddddd</groupId>
    <artifactId>hdfskeytab</artifactId>
    <version>1.0</version>

    <properties>
        <java.version>1.8</java.version>
        <pulsar.version>2.4.1</pulsar.version>
        <hadoop.version>2.7.1</hadoop.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath/>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-common</artifactId>
            <version>${
   
   hadoop.version}</version>
            <exclusions>
                <exclusion>
                    <