JavaWeb中导入导出Excel数据

//数据
ArrayList<DemoClass> list = new ArrayList<DemoClass>();
        for(int i=0;i<3;i++){
            DemoClass demoClass = new DemoClass();
            demoClass.setId(String.valueOf(i));
            demoClass.setPassword("password"+i);
            demoClass.setUsername("username"+i);
            list.add(demoClass);
        }
        //列头
        String[] headers = { "id","username","password"};
        ExportExcel<DemoClass> excel = new ExportExcel<DemoClass>();
        //输出
        OutputStream out = new FileOutputStream("d://test.xls");  
        excel.exportExcel("hcp信息", headers, list, out);
        System.out.println("创建成功");