java中调用kettle转换文件
java中调用kettle转换文件 通过命令行也可以调用,然后java中调用命令行代码也可以;这样没有和java代码逻辑无缝集成。本文说明kettle5.1中如果通过其他API和java代码无缝集成;网上大多数资料都是低版本的,在kettle5.x中已经不能运行。 1、 需要哪些jar文
java中调用kettle转换文件
通过命令行也可以调用,然后java中调用命令行代码也可以;这样没有和java代码逻辑无缝集成。本文说明kettle5.1中如果通过其他API和java代码无缝集成;网上大多数资料都是低版本的,在kettle5.x中已经不能运行。
1、 需要哪些jar文件
以kettle开头的是必须,上图最下面三个也要;红色框中的两个是我测试转换用到的,分别是生成UUID和文件。
要是少了jar文件,运行程序一定报错,大家根据错误到kettle安装目录LIB中找相应的jar加到编译路径中。
2、 示例说明如何通过java调用转换
示例是把一个excel的内容导入到数据中,excel只有两列,所以需要在kettle中生成一列uuid,然后导入到数据库中。
默认生成的uuid有‘-’间隔符,所以通过“Replace in string”替换为空;
excel步骤,使用了命名参数,所以要在转换配置设置命名参数。
示例代码如下:
publicclass KettleUtil2 { public String RES_DIR = "res"; private String fullFileName ; public KettleUtil2(String fileName){ fullFileName = System.getProperty("user.dir") + File.separator + RES_DIR; fullFileName += File.separator + fileName; } /** * 没有参数是,设置参数为null * @param paras */ publicvoid runTransformation(Map<String,String> paras) { try { KettleEnvironment.init(); TransMeta transMeta = new TransMeta(fullFileName); Trans transformation =new Trans(transMeta); for(Map.Entry<String, String> entry: paras.entrySet()) { transformation.setParameterValue(entry.getKey(), entry.getValue()); } transformation.execute(null); transformation.waitUntilFinished(); if (transformation.getErrors() > 0) { thrownew RuntimeException( "There wereerrors during transformation execution."); } } catch (KettleException e) { System.out.println(e); } } }
最后调用代码如下:
publicclass EtlTest { publicstaticvoid main(String[] args) { KettleUtil2 etl = new KettleUtil2("testimport.ktr"); Map<String,String> para = new HashMap<String,String>(); //给转换中命名参数赋值 para.put("XlsName", "data"); etl.runTransformation(para); } }

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