springboot 整合 jasperreport 问题

Question

网上资料也不多，问题比较困扰
config:

@Configuration
@EnableWebMvc
public class JasperConfig extends WebMvcConfigurerAdapter {
    @Override
    public void configureDefaultServletHandling(final DefaultServletHandlerConfigurer configurer) {

        configurer.enable();
    }

    @Bean
    public JasperReportsViewResolver getJasperReportsViewResolver() {

        JasperReportsViewResolver resolver = new JasperReportsViewResolver();
        resolver.setPrefix("classpath:templates/");
        resolver.setSuffix(".jrxml");

        resolver.setReportDataKey("datasource");
        resolver.setViewNames("*tb*");//jrxml模板名
        resolver.setViewClass(JasperReportsMultiFormatView.class);
        resolver.setOrder(0);
        return resolver;
    }
  }

controller:

@Controller
@RequestMapping(value = "/reports")
public class UserController {

    private static final String REPORT_NAME = "reportName";
    private static final String FILE_FORMAT = "format";
    private static final String DATASOURCE = "datasource";

    @GetMapping("/{reportName}")
    @ResponseBody
    public ModelAndView getReportByParam(final ModelMap modelMap,
                                         @PathVariable(REPORT_NAME) final String reportName,
                                         @RequestParam(FILE_FORMAT) final String format) {
        JRDataSource dbSource = new JRBeanCollectionDataSource(Name.getList());
//    数据源没有自动注入，自己写了实体类模拟查询，数据源应该没有问题
        modelMap.put(DATASOURCE, dbSource);
        modelMap.put(FILE_FORMAT, format);
        ModelAndView modelAndView = new ModelAndView(reportName, modelMap);
        return modelAndView;
    }

最终的报错：

PDF应该是Format里写好的属性 ，为什么会读不到，跪求解答

Answer 1

format值小写，format=pdf
源码里:

  /**
   * Creates a new {@code JasperReportsMultiFormatView} instance
   * with a default set of mappings.
   */
    public JasperReportsMultiFormatView() {
        this.formatMappings = new HashMap<String, Class<? extends AbstractJasperReportsView>>(4);
        this.formatMappings.put("csv", JasperReportsCsvView.class);
        this.formatMappings.put("html", JasperReportsHtmlView.class);
        this.formatMappings.put("pdf", JasperReportsPdfView.class);
        this.formatMappings.put("xls", JasperReportsXlsView.class);
        this.formatMappings.put("xlsx", JasperReportsXlsxView.class);
    }