代码如下：
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
public class HDFSClient {
public static void main(String[] args) throws Exception {
// 1 获取文件系统
Configuration configuration = new Configuration();
// 配置在集群上运行
configuration.set("fs.defaultFS", "hdfs://hadoop102:8020");
FileSystem fs = FileSystem.get(configuration);
// 2 把本地文件上传到文件系统中
fs.copyFromLocalFile(new Path("e:/xiyou.txt"), new Path("/user/xiyou.txt"));
// 3 关闭资源
fs.close();
//System.out.println("over");
}
}
错误如下：
Exception in thread "main" java.lang.ExceptionInInitializerError
at org.apache.hadoop.util.StringUtils.<clinit>(StringUtils.java:80)
at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2806)
at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2802)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2668)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:371)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:170)
at com.root.hdfs.HDFSClient.main(HDFSClient.java:15)
Caused by: java.lang.StringIndexOutOfBoundsException: begin 0, end 3, length 2
at java.base/java.lang.String.checkBoundsBeginEnd(String.java:3319)
at java.base/java.lang.String.substring(String.java:1874)
at org.apache.hadoop.util.Shell.<clinit>(Shell.java:50)
... 7 more
