If you want to publish the report set CustomerAnalysis.cls that uses the catalog /SampleReports/SampleReports.cat to printer immediately, the URL used for this task is as below:
http://localhost:8888/jrserver?jrs.cmd=jrs.submit_schedule &jrs.catalog=%2fSampleReports%2fSampleReports.cat &jrs.task_class=jet.server.schedule.jrtasks.PublishRptTask &jrs.launch_type=0&jrs.to_printer=true &jrs.report=%2fSampleReports%2fCustomerAnalysis.cls &jrs.param$P_StartDate=01/01/2006 &jrs.param$p_EndDate=12/31/2007 &jrs.rpt_language=en