1.上篇文章已经讲到，怎么新建一个转换，当然，那只是很简单的操作，下面我们将学习怎么将在kettle新建的转换或任务，放入到程序中，由程序调用执行

首先，我们需要将kettle的jar包放入到程序的lib目录下，当然不只kettle包，还有其他一些重要的包，可以直接到http://download.csdn.net/download/xiaosemei/9967136进行下载，

2.新建项目kettle ，我这里用来演示，

3.kettle初始化代码（我这里执行和初始是分开的。。方便在次执行的时候不需要初始化）

import org.pentaho.di.core.KettleEnvironment;
import org.pentaho.di.core.database.DatabaseMeta;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.repository.RepositoryDirectoryInterface;
import org.pentaho.di.repository.kdr.KettleDatabaseRepository;
import org.pentaho.di.repository.kdr.KettleDatabaseRepositoryMeta;

/**
 * Created by 31767 on 2017/8/16.
 */
public class KettleEnvironments {
    public  static KettleDatabaseRepository repository;
    public  static DatabaseMeta databaseMeta;
    public  static KettleDatabaseRepositoryMeta kettleDatabaseMeta;
    public  static RepositoryDirectoryInterface directory;
    /*
    * KETTLE初始化*/
    public static  String  KettleEnvironments() {
         try {
            KettleEnvironment.init();repository = new KettleDatabaseRepository();
         databaseMeta = new DatabaseMeta("ETL", "Oracle", "Native", "172.14.5.6","cdr", "1521",
                "ETL", "xin");//资源库数据库地址，我这里采用oracle数据库
         kettleDatabaseMeta = new KettleDatabaseRepositoryMeta("ETL", "ERP",
                "Transformation description", databaseMeta);
        repository.init(kettleDatabaseMeta);
        repository.connect("adm", "adm");//资源库用户名和密码
        directory = repository.loadRepositoryDirectoryTree();
        } catch (KettleException e) {
            e.printStackTrace();
            return  e.getMessage();
        }
        return null;
      }

}

/**
 * Created by DEH on 2017/7/3.
 */

import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.job.Job;
import org.pentaho.di.job.JobMeta;
import org.pentaho.di.repository.Repository;
import org.pentaho.di.repository.RepositoryDirectoryInterface;
import org.pentaho.di.repository.kdr.KettleDatabaseRepository;
import org.pentaho.di.trans.Trans;
import org.pentaho.di.trans.TransMeta;

public class ExecRepository {

/*测试代码，*/
      public static void main(String[] args) {
         KettleEnvironments.KettleEnvironments();
        String transName=null;//转换或作业名称
        String[] params=null;//参数
        try {
            String result = ExecuteDataBaseRepTran(KettleEnvironments.repository, transName, params, null);
        } catch (KettleException e) {
            e.printStackTrace();
        }
    }



    /*执行转换文件*/
    private static String ExecuteDataBaseRepTran(KettleDatabaseRepository repository, String transName, String param[], String jgname) throws KettleException {
        //根据变量查找到模型所在的目录对象,此步骤很重要。
        RepositoryDirectoryInterface directory = repository.findDirectory("/");
        //创建ktr元对象
        TransMeta transformationMeta = ((Repository) repository).loadTransformation(transName, directory, null, true, null);
        //创建ktr
        Trans trans = new Trans(transformationMeta);
        //执行ktr
        trans.execute(param);
        //等待执行完毕
        trans.waitUntilFinished();
        if (trans.getErrors() > 0) {
            return "NO";
        } else {
            return "OK";
        }
    }

    private static String execRepositoryJobs(KettleDatabaseRepository repository, RepositoryDirectoryInterface directory, String jobName, String jhid) throws KettleException {
        JobMeta jobMeta = ((Repository) repository).loadJob(jobName, directory, null, null);
        Job job = new Job(repository, jobMeta);
        job.setVariable("id", jhid);
        job.start();
        job.waitUntilFinished();
        if (job.getErrors() > 0) {
            return "NO";
        } else {
            return "OK";
        }
    }

}