问本地使用api访问服务器上的hdfs，但是访问被拒绝？

我把hdfs的端口设置为8020，但是访问被拒绝了，无法连接

2020-03-27 01:07:53,109 WARN [org.apache.hadoop.util.NativeCodeLoader] - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

Exception in thread "main" java.net.ConnectException: Call From MD-20180625SAIU/10.62.3.103 to hadoop000:8020 failed on connection exception: java.net.ConnectException: Connection refused: no further information; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:423)

at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:791)

at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:731)

at org.apache.hadoop.ipc.Client.call(Client.java:1506)

at org.apache.hadoop.ipc.Client.call(Client.java:1439)

at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:230)

at com.sun.proxy.$Proxy9.mkdirs(Unknown Source)

at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.mkdirs(ClientNamenodeProtocolTranslatorPB.java:558)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:256)

at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:104)

at com.sun.proxy.$Proxy10.mkdirs(Unknown Source)

at org.apache.hadoop.hdfs.DFSClient.primitiveMkdir(DFSClient.java:3110)

at org.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:3077)

at org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:957)

at org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:953)

at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)

at org.apache.hadoop.hdfs.DistributedFileSystem.mkdirsInternal(DistributedFileSystem.java:953)

at org.apache.hadoop.hdfs.DistributedFileSystem.mkdirs(DistributedFileSystem.java:946)

at org.apache.hadoop.fs.FileSystem.mkdirs(FileSystem.java:1864)

at com.meicloud.bigdata.HdfsApp.main(HdfsApp.java:20)

Caused by: java.net.ConnectException: Connection refused: no further information

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)

at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)

at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:530)

at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:494)

at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:648)

at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:744)

at org.apache.hadoop.ipc.Client$Connection.access$3000(Client.java:396)

at org.apache.hadoop.ipc.Client.getConnection(Client.java:1555)

at org.apache.hadoop.ipc.Client.call(Client.java:1478)

... 20 more