1、在pom中添加依赖、主要依赖下面的jar

2、将制作好的etl图取名存放路径：编写代码​​​​​​

import org.pentaho.di.core.database.DatabaseMeta;  
import org.pentaho.di.core.exception.KettleException;  
import org.pentaho.di.core.logging.LogWriter;  
import org.pentaho.di.core.util.EnvUtil;  
import org.pentaho.di.job.Job;  
import org.pentaho.di.job.JobEntryLoader;  
import org.pentaho.di.job.JobMeta;  
import org.pentaho.di.repository.Repository;  
import org.pentaho.di.repository.RepositoryDirectory;  
import org.pentaho.di.repository.RepositoryMeta;  
import org.pentaho.di.repository.UserInfo;  
import org.pentaho.di.trans.StepLoader;  
import org.pentaho.di.trans.Trans;  
import org.pentaho.di.trans.TransMeta;  
  
/** 
 * Java调用Kettle示例代码 
 *  
 *  
 */  
public class KettleTest {  
  
    public static void main(String[] args) throws KettleException {  
        String filename = "voucher.ktr";  
        // callNativeTrans(filename);  
        // executeTrans();  
        // executeJobs();  
        callNativeTransWithParam(filename);  
        System.out.println("ok");  
    }  
  
    /** 
     * 调用本地的转换文件 
     *  
     * @Description: 
     * @param transFileName 
     * @throws KettleException 
     */  
    public static void callNativeTrans(String transFileName) throws KettleException {  
        // 初始化  
        EnvUtil.environmentInit();  
        StepLoader.init();  
        // 转换元对象  
        TransMeta transMeta = new TransMeta(transFileName);  
        // 转换  
        Trans trans = new Trans(transMeta);  
        // 执行转换  
        trans.execute(null);  
        // 等待转换执行结束  
        trans.waitUntilFinished();  
    }  
  
    /** 
     * 调用本地的转换文件（带参数） 
     *  
     * @Description: 
     * @param transFileName 
     * @throws KettleException 
     */  
    public static void callNativeTransWithParam(String transFileName) throws KettleException {  
        // 初始化  
        EnvUtil.environmentInit();  
        StepLoader.init();  
        // 转换元对象  
        TransMeta transMeta = new TransMeta(transFileName);  
        // 转换  
        Trans trans = new Trans(transMeta);  
        String[] params = {};  
        // 执行转换  
        trans.execute(params);  
        // 等待转换执行结束  
        trans.waitUntilFinished();  
  
    }  
  
    /** 
     * 执行存储在数据库资源库中的转换 
     *  
     * @Description: 
     * @throws KettleException 
     */  
    public static void executeTrans() throws KettleException {  
        // 初始化  
        EnvUtil.environmentInit();  
        StepLoader.init();  
        // 日志  
        LogWriter log = LogWriter.getInstance("TransTest.log", true, LogWriter.LOG_LEVEL_DEBUG);  
        // 用户  
        UserInfo userInfo = new UserInfo();  
        userInfo.setLogin("admin");  
        userInfo.setPassword("admin");  
        // 数据库连接元对象(连接名称，不必与kettle中配置的保持一致：数据库类型：连接方式（kettle支持的连接方式）：资源库IP：资源库实例名：资源库端口：资源库用户名：资源库用户密码)  
        DatabaseMeta connection = new DatabaseMeta("", "Oracle", "Native", "192.168.3.232", "NSDEV", "1521", "nstcsa3441", "671468");  
        // 资源库元对象  
        RepositoryMeta repinfo = new RepositoryMeta();  
        repinfo.setConnection(connection);  
        // 资源库  
        Repository rep = new Repository(log, repinfo, userInfo);  
        // 连接资源库  
        rep.connect("");  
        // 资源库目录对象  
        RepositoryDirectory dir = new RepositoryDirectory(rep);  
        // 转换元对象  
        TransMeta transMeta = new TransMeta(rep, "凭证（N9->EVC2）", dir);  
        // 转换  
        Trans trans = new Trans(transMeta);  
        // 执行转换  
        trans.execute(null);  
        // 等待转换执行结束  
        trans.waitUntilFinished();  
    }  
  
    /** 
     * 执行本地的任务文件 
     *  
     * @Description: 
     * @param jobFileName 
     * @throws KettleException 
     */  
    public static void callNativeJob(String jobFileName) throws KettleException {  
        // 初始化  
        EnvUtil.environmentInit();  
        JobEntryLoader.init();  
        StepLoader.init();  
        // 日志  
        LogWriter log = LogWriter.getInstance("TransTest.log", true, LogWriter.LOG_LEVEL_DETAILED);  
        // job元对象  
        JobMeta jobMeta = new JobMeta(log, jobFileName, null);  
        // job  
        Job job = new Job(log, StepLoader.getInstance(), null, jobMeta);  
        jobMeta.setInternalKettleVariables(job);  
        // 执行job  
        job.execute();  
        // 等待job执行结束  
        job.waitUntilFinished();  
    }  
  
    /** 
     * 执行数据库资源库中的任务 
     *  
     * @Description: 
     * @throws KettleException 
     */  
    public static void executeJobs() throws KettleException {  
        // 初始化  
        EnvUtil.environmentInit();  
        JobEntryLoader.init();  
        StepLoader.init();  
        // 日志  
        LogWriter log = LogWriter.getInstance("TransTest.log", true, LogWriter.LOG_LEVEL_DETAILED);  
        // 用户  
        UserInfo userInfo = new UserInfo();  
        userInfo.setLogin("admin");  
        userInfo.setPassword("admin");  
        // 数据库连接元对象  
        DatabaseMeta connection = new DatabaseMeta("", "Oracle", "Native", "192.168.3.232", "NSDEV", "1521", "nstcsa3441", "671468");  
        // 资源库元对象  
        RepositoryMeta repinfo = new RepositoryMeta();  
        repinfo.setConnection(connection);  
        // 资源库  
        Repository rep = new Repository(log, repinfo, userInfo);  
        // 连接资源库  
        rep.connect("");  
        // 资源库目录对象  
        RepositoryDirectory dir = new RepositoryDirectory(rep);  
        // 步骤加载对象  
        StepLoader steploader = StepLoader.getInstance();  
        // job元对象  
        JobMeta jobmeta = new JobMeta(log, rep, "4.账户每日余额", dir);  
        // job  
        Job job = new Job(log, steploader, rep, jobmeta);  
        // 执行job  
        job.execute();  
        // 等待job执行结束  
        job.waitUntilFinished();  
  
    }  
  
}