快速学习JasperReport-Chart图表

public class UserCount {
    private String companyName;
    private Integer count;
    public UserCount(String companyName, Integer count) {
        this.companyName = companyName;
        this.count = count;
   }
    public String getCompanyName() {
        return companyName;
   }
    public void setCompanyName(String companyName) {
        this.companyName = companyName;
   }
    public Integer getCount() {
        return count;
    }
    public void setCount(Integer count) {
        this.count = count;
   }
}

//测试图表
    @GetMapping("/testJasper06")
    public void createPdf(HttpServletRequest request, HttpServletResponse response) 
throws Exception {
        //1.引入jasper文件
        Resource resource = new ClassPathResource("templates/testChart.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();
            //parameters.put("userCountList",getUserList());
            //构造javaBean数据源
            JRBeanCollectionDataSource ds = new
JRBeanCollectionDataSource(getUserList());
            /**
             * 1.jasper文件流
             * 2.参数列表
             * 3.JRBeanCollectionDataSource
             */
            JasperPrint print = JasperFillManager.fillReport(fis, parameters,ds);
            //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<UserCount> getUserList() throws Exception {
        List<UserCount> list = new ArrayList<>();
        UserCount uc1 = new UserCount("传智播客",10);
        UserCount uc2 = new UserCount("黑马程序员",10);
        list.add(uc1);
        list.add(uc2);
        return list;
   }