HDFS的JAVA客户端编写

逃离我推掉我的手 2023-08-17 16:14 123阅读 0赞

**jar包方式部署：**

**1、创建一个java工程，命名为weekend110**

![1496987-20190905170749362-1214408074.png][]

**2、需要在java Build Path添加Libraries命名为hdfs　**

![1496987-20190905171133379-1647780724.png][]

![1496987-20190905171226371-650618871.png][]

**在hdfs里面 添加jar包：**

![1496987-20190905171525392-525706960.png][]

**接着添加lib所有jar包：**

![1496987-20190905171649390-707295432.png][]

**再添加common的核心包：**

![1496987-20190905171802416-480893835.png][]

**最后再重新添加lib包，重复可以覆盖！**

**完成ok！**

**第二步，创建java工程！**

![1496987-20190905172134373-1432232495.png][]

**第三步：在Linux环境下启动命令：start-dfs.sh**

![1496987-20190905172330382-1249178762.png][]

** 第四步：查看**

![1496987-20190905172422362-1153195463.png][]

**第五步：创建一个download文件**

![1496987-20190905172508446-197969369.png][]

第六步：在java代码的main方法直接运行，会出现错误：

![1496987-20190905172651362-1288068125.png][]

** 分析：没有拿到hdfs的事例，只拿到本地文件的事例！**

**解决问题：**

**方法1：****在java工程的src目录创建一个core-site.xml、hdfs-site.xml文件，配置属性是：**

core-site.xml:

**<configuration>**  
****  
 **<property>**  
 **<name>fs.defaultFS</name>**  
 **<value>hdfs://192.168.66.5:9000</value>**  
 **</property>**  
 ****  
 **<property>**  
 **<name>hadoop.tmp.dir</name>**  
 **<value>/usr/local/hadoop/hadoop-2.4.1/data</value>**  
 **</property>**

**</configuration>**

**hdfs-site.xml:**

**<configuration>**  
****  
**<property>**  
**<name>dfs.replication</name>**  
**<value>1</value>**  
**</property>**  
****  
**<property>**  
**<name>dfs.permissions.enabled</name>**  
**<value>false</value>**  
**</property>**  
**</configuration>**

**如图所示：**

![1496987-20190905174046391-2051619656.png][]

** **

** 最后，直接运行：**

![1496987-20190905174210371-2379968.png][]

转载于:https://www.cnblogs.com/studygithub5208868/p/11468648.html

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