kettle 3：java调用transformation

/**
	 * 调用资源库中的trans
	 * 
	 * @throws KettleException
	 */
	public void executeTrans() throws KettleException {
		// 初始化
		EnvUtil.environmentInit();
		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("merit113", "Oracle",
				"Native", "localhost", "merit113", "1521", "kettle", "merit");

		// 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, "code_trans", 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();

	}

 /**

	 * 调用本地trans
	 * 
	 * @param transFileName
	 *            trans文件路径
	 * @throws KettleException
	 */
	public 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();

	}