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-db.jar、kettle-engine.jar ,其它jar根据情况进行添加,所需的jar在<kettle-home>\lib、<kettle-home>\libext下面都可以找到,本示例引用的jar如下图:
之后编写代码测试Java调用,调用前先使用Kettle的设计器设计了一个转换,取名为voucher.ktr。另外,本示例使用的是Kettle3.2的版本,据说4.1版本调用方法会有不同。
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(); }}
本示例只能实现一次调用,暂时不知道如何通过API设定运行时间,但可以结合Spring和Quartz,设定定时调度,以便实现调度目标。