使用Spring Boot和JasperReports生成报表

import net.sf.jasperreports.engine.*;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
 
@Service
public class ReportService {
 
    @Resource
    private ResourceLoader resourceLoader;
 
    public JasperPrint generateReport(String reportSource, Map<String, Object> parameters) throws Exception {
        Resource resource = resourceLoader.getResource("classpath:" + reportSource);
        FileInputStream fis = new FileInputStream(resource.getFile());
        JasperReport jasperReport = (JasperReport) JRLoader.loadObject(fis);
        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, new JREmptyDataSource());
        fis.close();
        return jasperPrint;
    }
 
    public byte[] exportReport(JasperPrint jasperPrint, String exportFormat) throws Exception {
        Exporter exporter = new JRPdfExporter();
        exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
        exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, new ByteArrayOutputStream());
        exporter.exportReport();
        return ((ByteArrayOutputStream) exporter.getParameter(JRExporterParameter.OUTPUT_STREAM)).toByteArray();
    }
}

这个示例代码提供了一个简单的服务类，用于生成和导出报表。generateReport 方法接受报表源路径和参数，使用JasperReports库来填充和编译报表，然后返回JasperPrint对象。exportReport 方法接受JasperPrint对象和导出格式，并将报表导出为字节数组。这个服务类可以被Spring框架注入到其他需要生成报表的组件中。