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Java操作Sqoop对象

Windows下使用Eclipse工具操作Sqoop1.4.6对象

Sqoop是用来在关系型数据库与Hadoop之间进行数据的导入导出,Windows下使用Eclipse工具操作时,需要先搭建好Hadoop的开发环境

  1. 参照Java操作HDFS对象的pom.xml配置,添加配置

    <dependency>
        <groupId>org.apache.sqoop</groupId>  
        <artifactId>sqoop</artifactId>  
        <version>1.4.6</version>
    </dependency> 
    <dependency> 
        <groupId>mysql</groupId>  
        <artifactId>mysql-connector-java</artifactId>  
        <version>5.1.36</version>
    </dependency> 

    使用MySQL进行数据和Hadoop之间的导入导出操作,需要MySQL的驱动包。sqoop-1.4.6.jar包在maven里下载不下来,将sqoop的安装目录下$SQOOP_HOME下的sqoop-1.4.6.jar包拷贝到maven仓库对应的sqoop的目录下即可。

  2. Windows下配置Sqoop的环境变量 
    Windows下操作Sqoop时需要使用到Sqoop下的包,需要配置环境变量。 
    将下载的sqoop-1.4.6.bin__hadoop-2.0.4-alpha.tar.gz解压到本机目录下,配置Sqoop的环境变量:

    SQOOP_HOME=F:\data\sqoop-1.4.6.bin__hadoop-2.0.4-alpha
    PATH=PATH;%SQOOP_HOME%\bin; 
  3. 检查是否配置成功 
    sqoop version 
    技术分享 
    警告不用管,Windows下不需配置

  4. Java操作Sqoop对象 
    Windows本机下MySQL服务要先启动

    • 4.1 将MySQL数据导入到HDFS

      import org.apache.hadoop.conf.Configuration;
      import org.apache.sqoop.Sqoop;
      import org.apache.sqoop.tool.SqoopTool;
      import org.apache.sqoop.util.OptionsFileUtil;
      
      public class SqoopTest {
      
          private static int importDataFromMysql() throws Exception {
              String[] args = new String[] {
                      "--connect","jdbc:mysql://192.168.1.97:3306/mydb",
                      "--driver","com.mysql.jdbc.Driver",
                      "-username","root",
                      "-password","root",
                      "--table","user",
                      "-m","1",
                      "--target-dir","java_import_user"           
              };
      
              String[] expandArguments = OptionsFileUtil.expandArguments(args);
      
              SqoopTool tool = SqoopTool.getTool("import");
      
              Configuration conf = new Configuration();
              conf.set("fs.default.name", "hdfs://192.168.1.200:9000");//设置HDFS服务地址
              Configuration loadPlugins = SqoopTool.loadPlugins(conf);
      
              Sqoop sqoop = new Sqoop((com.cloudera.sqoop.tool.SqoopTool) tool, loadPlugins);
              return Sqoop.runSqoop(sqoop, expandArguments);
          }
      
          public static void main(String[] args) throws Exception {
              importDataFromMysql();
          }
      
      } 

      可以在HDFS上查看生成的文件 
      技术分享 
      发现在HDFS下生成了目录/user/cyyun/java_import_user,程序中--target-dir没有指定具体路径,本机Windows的用户名是cyyun,在Windows上使用程序操作时会在/user/下生成一个Windows用户名的目录 
      查看结果:

      hadoop fs -cat /user/cyyun/java_import_user/part-m-00000
      hadoop fs -cat /user/cyyun/java_import_user/part-m-00001 

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      将程序中--target-dir指定为/user/root/java_import_user,运行查看结果:

      hadoop fs -cat /user/root/java_import_user/part-m-00000 

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本文参考: 
http://blog.csdn.net/guzicheng/article/details/41519947

Java操作Sqoop对象