首先下载Kettle工具,最新的版本是Kettle 5.0.1-stable,Kettle 5.0.1-stable的下载页面:Kettle 5.0.1-stable
Java调用Kettle执行任务或转换,需要使用Kettle中的jar,可以先导入lib目录中的几个基本的jar,如:kettle-core.jar、kettle-engine.jar、kettle-db.jar ,所需的jar在\lib、\libext 下面都可以找到,其它jar根据情况进行添加,本示例引用的kettle的jar如下图:
![43d97196a436704a1985766d2b055577.png](https://img-blog.csdnimg.cn/img_convert/43d97196a436704a1985766d2b055577.png)
然后后编写代码测试Java调用,调用前先使用Kettle的设计器设计了一个转换,取名为mysql_to_oracle.ktr。另外,本示例使用的是Kettle 4.4.0-stable版,Kettle 4.4.0-stable的下载页: Kettle 4.4.0-stable 。
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;
import org.pentaho.di.core.KettleEnvironment;
//Java调用Kettle示例代码
// 李文锴
public class KettleTest {
public static void main(String[] args) throws KettleException {
String filename = "mysql_to_oracle.ktr";
// callNativeTrans(filename);
// executeTrans();
// executeJobs();
callNativeTransWithParam(filename);
System.out.println("ok");
}
//调用本地的转换文件
public static void callNativeTrans(String transFileName) throws KettleException {
// 初始化
EnvUtil.environmentInit();
KettleEnvironment.init();
//kettle3.2以后下面这句就不要了
//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();
if ( trans.getErrors() > 0 ){
System.out.println("转换失败!");
}
}
//调用本地的转换文件(带参数)
public static void callNativeTransWithParam(String transFileName) throws KettleException {
// 初始化
EnvUtil.environmentInit();
KettleEnvironment.init();
//kettle3.2以后下面这句就不要了
//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
public static void executeTrans() throws KettleException {
// 初始化
EnvUtil.environmentInit();
KettleEnvironment.init();
//kettle3.2以后下面这句就不要了
//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
public static void callNativeJob(String jobFileName) throws KettleException {
// 初始化
EnvUtil.environmentInit();
KettleEnvironment.init();
//kettle3.2以后下面这句就不要了
//StepLoader.init();
JobEntryLoader.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
public static void executeJobs() throws KettleException {
// 初始化
EnvUtil.environmentInit();
JobEntryLoader.init();
KettleEnvironment.init();
//kettle3.2以后下面这句就不要了
//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();
}
}
参考资料地址:http://blog.csdn.net/scorpio3k/article/details/7869196 作者:scorpio3k