快速学习JasperReport-父子报表

 	//测试父子模板
    @GetMapping("/testJasper07")
    public void createPdf(HttpServletRequest request, HttpServletResponse response) 
throws Exception {
        //1.引入jasper文件
        Resource resource = new ClassPathResource("templates/main.jasper");
        FileInputStream fis = new FileInputStream(resource.getFile());
        //2.创建JasperPrint,向jasper文件中填充数据
        ServletOutputStream os = response.getOutputStream();
        try {
            HashMap parameters = new HashMap();
            Resource subResource = new ClassPathResource("templates/sub-group.jasper");
            parameters.put("subpath",subResource.getFile().getPath());
            parameters.put("sublist",getUserList());
            parameters.put("sublist",getUserList());
            JRBeanCollectionDataSource ds = new
JRBeanCollectionDataSource(getUserList());
            JasperPrint print = JasperFillManager.fillReport(fis, parameters,new
JREmptyDataSource());
            //3.将JasperPrint已PDF的形式输出
            JasperExportManager.exportReportToPdfStream(print,os);
            response.setContentType("application/pdf");
       } catch (JRException e) {
            e.printStackTrace();
       }finally {
            os.flush();
       }
   }
    //创建数据库Connection
    public List<User> getUserList() throws Exception {
        List<User> list = new ArrayList<>();
        for(int i=1;i<=3;i++) {
            User user = new User("it00"+i, "itcast"+i, "1380000000"+i, "传智播客", "讲 师");
            list.add(user);
       }
        for(int i=1;i<=3;i++) {
            User user = new User("hm00"+i, "itheima"+i, "1880000000"+i, "黑马程序员", "讲 师");
            list.add(user);
       }
        return list;
   }