java如何调用kettle设置变量和参数

public class JobMail {
	public static void main(String[] args) throws KettleException {

		KettleDatabaseRepository repository = KettleUtils.kettleDbRepository;
		String job_path = "/201811_JOB";
		String job_name = "A_邮件job_para";
		execJob(repository, job_path, job_name);
	}

	/**
	 * 执行 JOB
	 * 
	 * @param repository
	 *            kettle数据库资源库
	 * @param job_path
	 *            JOB 目录
	 * @param job_name
	 *            JOB 名称
	 * @throws KettleException
	 */
	private static void execJob(KettleDatabaseRepository repository, String job_path, String job_name) throws KettleException {
		RepositoryDirectoryInterface dir = repository.findDirectory(job_path);
		JobMeta jobMeta = repository.loadJob(repository.getJobId(job_name, dir), null);
		Job job = new Job(repository, jobMeta);
		// 设置参数
		jobMeta.setParameterValue("sql_file", "d://12");
		jobMeta.setParameterValue("sql_file_para", "java中参数");
		job.setLogLevel(LogLevel.DEBUG);
		// 设置变量 java代码中变量会覆盖kettle里面设置的变量
		job.setVariable("sql_file", "d://13");
		// 启动执行指定的job
		job.start();
		job.waitUntilFinished();// 等待job执行完；
		job.setFinished(true);
		System.out.println(job.getResult());

	}
}

public class KettleUtils {
	private static Logger logger = Logger.getLogger(KettleUtils.class);

	private KettleUtils() throws Exception {
		throw new Exception("工具类不允许创建");
	}

	/**
	 * kettle 资源库
	 */
	public static KettleDatabaseRepository kettleDbRepository;

	static {
		if (kettleDbRepository == null) {
			kettleDbRepository = getKettleDatabaseRepository();
			logger.info("实例化kettle资源库");
		}
	}

	/**
	 * 设置kettle资源库连接信息
	 * 
	 * @return
	 */
	public static DatabaseMeta setDatabaseMeta() {
		return new DatabaseMeta(PropUtils.getConfigValByKey("name"), PropUtils.getConfigValByKey("type"), PropUtils.getConfigValByKey("access"), PropUtils.getConfigValByKey("host"), PropUtils.getConfigValByKey("db"), PropUtils.getConfigValByKey("port"), PropUtils.getConfigValByKey("user"), PropUtils.getConfigValByKey("pass"));
	}

	/**
	 * kettle 资源库 获取
	 * 
	 * @return
	 */
	private static KettleDatabaseRepository getKettleDatabaseRepository() {
		try {
			KettleEnvironment.init();
			// 创建DB资源库
			KettleDatabaseRepository repository = new KettleDatabaseRepository();
			DatabaseMeta databaseMeta = KettleUtils.setDatabaseMeta();
			// 选择资源库 此处参我与本地不一致还是正确执行
			KettleDatabaseRepositoryMeta kettleDatabaseRepositoryMeta = new KettleDatabaseRepositoryMeta("Kettle", "Kettle", "Transformation description", databaseMeta);
			repository.init(kettleDatabaseRepositoryMeta);
			// 连接资源库 DatabaseMeta中已经设置了，不明白此处为何还要再次设置
			repository.connect("admin", "admin");
			return repository;
		} catch (KettleException e) {
			e.printStackTrace();
			logger.error("kettle资源库连接失败");
		}
		return null;
	}
}