java 访问 kerberos hdfs

先从服务上下载krb5.conf和keytab文件到本地目录中


package java调用kerberostohdfs;

import java.io.IOException;  
import java.net.URI;  
  
import org.apache.hadoop.conf.Configuration;  
import org.apache.hadoop.fs.FileStatus;  
import org.apache.hadoop.fs.FileSystem;  
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.security.UserGroupInformation; 

public class HdfsKerberosDemo {
	static Configuration conf = new Configuration();  
	  
    static {  
    	System.setProperty("java.security.krb5.conf","E:/kerberosconf/krb5.conf");//设置kerberos配置信息
        conf.set("fs.defaultFS", "hdfs://cluster");  
        conf.set("dfs.nameservices", "cluster");  
        conf.set("dfs.ha.namenodes.cluster", "nn1,nn2");  
        conf.set("dfs.namenode.rpc-address.cluster.nn1", "xxx.xxx.xx.xx:8020");  
        conf.set("dfs.namenode.rpc-address.cluster.nn2", "xxx.xxx.xx.xx:8020");  
        conf.set("dfs.client.failover.proxy.provider.cluster","org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider"); 
        conf.set("fs.hdfs.impl",org.apache.hadoop.hdfs.DistributedFileSystem.class.getName());  
        conf.set("fs.file.impl",org.apache.hadoop.fs.LocalFileSystem.class.getName());  
        conf.set("fs.webhdfs.impl",org.apache.hadoop.hdfs.web.WebHdfsFileSystem.class.getName());  
        conf.setBoolean("hadoop.security.authentication",true);  
        conf.set("hadoop.security.authentication","kerberos");  
        UserGroupInformation.setConfiguration(conf); 
        try {
			UserGroupInformation.loginUserFromKeytab("hq/[email protected]","E:/kerberosconf/hq.keytab");//kerberos 认证  
	        UserGroupInformation.getLoginUser(); 
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    }  
      
    public static void  getDirectoryFromHdfs(String direPath){  
        try {  
            FileSystem fs = FileSystem.get(URI.create(direPath),conf);  
            FileStatus[] filelist = fs.listStatus(new Path(direPath));  
            for (int i = 0; i < filelist.length; i++) {  
                System.out.println("_________" + direPath + "目录下所有文件______________");  
                FileStatus fileStatus = filelist[i];  
                System.out.println("Name:"+fileStatus.getPath().getName());  
                System.out.println("Size:"+fileStatus.getLen());  
                System.out.println("Path:"+fileStatus.getPath());  
            }  
            fs.close();  
        } catch (Exception e){  
  
        }  
    }  
  
    public static void uploadFile(String src,String dst) throws IOException{  
          
        FileSystem fs = FileSystem.get(conf);  
        Path srcPath = new Path(src); //本地上传文件路径  
        Path dstPath = new Path(dst); //hdfs目标路径  
        //调用文件系统的文件复制函数,前面参数是指是否删除原文件，true为删除，默认为false  
        fs.copyFromLocalFile(false, srcPath, dstPath);  
  
        //打印文件路径  
        System.out.println("Upload to "+conf.get("fs.default.name"));  
        System.out.println("------------list files------------"+"\n");  
        FileStatus [] fileStatus = fs.listStatus(dstPath);  
        for (FileStatus file : fileStatus)  
        {  
            System.out.println(file.getPath());  
        }  
        fs.close();  
    }  
      
    public static void main(String[] args) throws IOException {  
  
//        String localFilePath = "D:\\Project\\eclipse\\workspace\\DataCenterChanger\\test\\20180108.txt";  
//        String hdfsFilePath = "/tmp/";  
//        System.out.println(localFilePath);  
//        System.out.println(hdfsFilePath);  
//        uploadFile(localFilePath,hdfsFilePath);  
        getDirectoryFromHdfs("/test/");  
  
    }  
}

pom.xml

<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>
	<dependency>
	    <groupId>org.apache.hadoop</groupId>
	    <artifactId>hadoop-maven-plugins</artifactId>
	    <version>2.7.3</version>
	</dependency>