How can I generate a pdf with jasperReport from the controller?

I just start in this and I do not know how to implement a pdf, I'm using mvc spring, I already have a format made with iReport, now what I want is to visualize it in my jsp so I can download it, but how do I do it?

Does anyone have a code that I can use to implement it and send it to call from my controller? I want that by clicking on a button of my jsp I can visualize my format and if I want it to be downloaded

I just added this code that they said would help me, but I do not know what to do next, I hope they can help me

@Bean
public  JasperReportsViewResolver getJasperReportsViewResolver(){

JasperReportsViewResolver resolver = new JasperReportsViewResolver();
resolver.setPrefix("classpath:/jasperreports");
resolver.setSuffix(".jasper");
resolver.setReportDataKey("datasource");
resolver.setViewClass(JasperReportsMultiFormatView.class);
resolver.setOrder(1);

return resolver;



}