kill pig job

[李运田]

I  want to kill pig job using java.
now ,I can get pigserver by PigServer pigServer = new 
PigServer(ExecType.MAPREDUCE,  conf);
and I googled ,I can set pig name by 
1、pigServer.getPigContext().getProperties().setProperty(PigContext.JOB_NAME,"my 
job");
2、pigServer.setJobName("my job");
but,how can I get pig jobId and kill the job?
thank you.