kettle 设计完成之后，可以在设计工具中进行调用，也可以使用java代码进行调用。

 

1.通过文件方式执行转换。

public static void runTransfer(String[] params, String ktrPath) {  
        Trans trans = null;  
        try {  
            // // 初始化  
            // 转换元对象  
            KettleEnvironment.init();// 初始化              EnvUtil.environmentInit();  
            TransMeta transMeta = new TransMeta(ktrPath);  
            // 转换  
            trans = new Trans(transMeta);  
              
            // 执行转换              trans.execute(params);  
            // 等待转换执行结束              trans.waitUntilFinished();  
            // 抛出异常  
            if (trans.getErrors() > 0) {  
                throw new Exception(  
                        "There are errors during transformation exception!(传输过程中发生异常)");  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }

 

2.通过文件方式执行job

public static void runJob(Map<String,String> maps, String jobPath) {  
        try {  
            KettleEnvironment.init();  
            // jobname 是Job脚本的路径及名称  
            JobMeta jobMeta = new JobMeta(jobPath, null);  
            Job job = new Job(null, jobMeta);  
            // 向Job 脚本传递参数，脚本中获取参数值：${参数名}  
            // job.setVariable(paraname, paravalue);  
            Set<Entry<String, String>> set=maps.entrySet(); 
            for(Iterator<Entry<String, String>> it=set.iterator();it.hasNext();){ 
                Entry<String, String> ent=it.next(); 
                job.setVariable(ent.getKey(), ent.getValue());  
            } 
            job.start();  
            job.waitUntilFinished();  
            if (job.getErrors() > 0) {  
                throw new Exception(  
                        "There are errors during job exception!(执行job发生异常)");  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }

 

3.执行资源库的中的转换。

public static void runWithDb() throws KettleException{ 
        KettleEnvironment.init(); 
        //创建DB资源库 
        KettleDatabaseRepository repository=new KettleDatabaseRepository(); 
        DatabaseMeta databaseMeta=new DatabaseMeta("kettle","mysql","jdbc","localhost","kettle","3306","root","root"); 
        //选择资源库 
        KettleDatabaseRepositoryMeta kettleDatabaseRepositoryMeta=new KettleDatabaseRepositoryMeta("kettle","kettle","Transformation description",databaseMeta); 
        repository.init(kettleDatabaseRepositoryMeta); 
        //连接资源库 
        repository.connect("admin","admin"); 
        RepositoryDirectoryInterface directoryInterface=repository.loadRepositoryDirectoryTree(); 
        //选择转换 
        TransMeta transMeta=repository.loadTransformation("demo1",directoryInterface,null,true,null); 
        Trans trans=new Trans(transMeta); 
        trans.execute(null); 
        trans.waitUntilFinished();//等待直到数据结束 
        if(trans.getErrors()>0){ 
            System.out.println("transformation error"); 
        }else{ 
            System.out.println("transformation successfully"); 
        } 
   }

 

可以将转换文件存储到资源库，通过程序进行调用。