报表导出有很多种方法，像之前我有写过的jxl，poi，jasperreport又或者各种商业软件，这次来简单介绍下用了许久的开源*easypoi。

easypoi的底层原理就不介绍了。因为官方文档的不足，本次简单记录下使用easypoi导出excel的各种方法。

首先在具体介绍前，建议大家先看一看easypoi的官方文档，http://easypoi.mydoc.io/

文档中基础使用上的介绍还是比较详细的。

本次我以目前流行的springboot项目为例。

第一步我们需要引入easypoi的依赖，一个自定义的starter

 <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-spring-boot-starter</artifactId>
            <version>3.3.0</version>
        </dependency>

注意：引入了这个就不用再引入poi的包了，自定义的starter已经包含相关依赖了。

1、默认导出方式

导出类的配置

@Getter
@Setter
public class GroupCtrlVO {
    @Excel(name = "操作人", orderNum = "1", width = 30)
    private String ctrlUser;
    @Excel(name = "操作时间", orderNum = "2", width = 30, format = "yyyy-MM-dd HH:mm:ss")
    private Date ctrlTime;
    @Excel(name = "标签名称", orderNum = "3", width = 30)
    private String groupName;
    @Excel(name = "操作类型", orderNum = "4", width = 30)
    private String ctrlOperation;
}

service的配置

@Override
    public void export(String login, HttpServletResponse response) {
        OutputStream output = null;
        try {
            WebUserDO userDO = cmWebUserMapper.getWebUserByLogin(login);
            List<GroupCtrlVO> list = crmCustomerInfoGroupMapper.listCtrlVo(userDO.getId());
            Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(), GroupCtrlVO.class, list);
            response.setHeader("Content-disposition", "attachment; filename=" + URLEncoder.encode(login+ "标签操作记录.xls", "UTF-8"));
            response.setContentType("application/msexcel");
            output = response.getOutputStream();
            workbook.write(output);
        } catch (Exception e) {
            log.error("标签操作记录导出失败！", e);
        } finally {
            try {
                output.close();
            } catch (IOException e) {
                log.error("标签操作记录输出流关闭失败！", e);
            }
        }
    }

2、模板导出方式

excel模板：相关循环参数参考官方文档

service配置：

@Override
    public void export(String startDate, String endDate, HttpServletResponse response) {
        OutputStream output = null;
        try {
            List<Test> list = testMapper.list(startDate,endDate);
            TemplateExportParams params = new TemplateExportParams(ExcelPathUtils.convertTemplatePath("static/report/template_test_report.xlsx"));
            Map<String, Object> data = new HashMap<String, Object>();
            data.put("list", list);
            Workbook workbook = ExcelExportUtil.exportExcel(params, data);
            response.setHeader("Content-disposition", "attachment; filename=" + URLEncoder.encode(startDate+"~"+endDate + "测试报表.xlsx", "UTF-8"));
            response.setContentType("application/msexcel");
            output = response.getOutputStream();
            workbook.write(output);

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                output.close();
            } catch (IOException e) {
                log.error("测试报表输出流关闭失败！", e);
            }
        }
    }

注意：导出的字段要和模板循环到字段相同

3、模板多sheet导出

多sheet模板:

 

service配置：

@Override
    public void export(String startDate, String endDate, String strategyName, HttpServletResponse response) {
        OutputStream output = null;
        try {
            //查表1数据
            List<Test1DO> list = testMapper.listStrategy(strategyName, startDate, endDate);
            //查表2数据
            List<Test2DO> listDetail = test2Mapper.listStrategy(strategyName, startDate, endDate);
            TemplateExportParams params = new TemplateExportParams(ExcelPathUtils.convertTemplatePath("static/report/template_test_two_sheet_report.xlsx"),true);
            Map<String, Object> data = new HashMap<String, Object>();
            data.put("list", list);
            data.put("listDetail", listDetail);
            Workbook workbook = ExcelExportUtil.exportExcel(params, data);
            response.setHeader("Content-disposition", "attachment; filename=" + URLEncoder.encode(startDate+"~"+endDate + "测试多表单报表.xlsx", "UTF-8"));
            response.setContentType("application/msexcel");
            output = response.getOutputStream();
            workbook.write(output);
        } catch (Exception e) {
            log.error("测试多表单导出失败！", e);
        } finally {
            try {
                output.close();
            } catch (IOException e) {
                log.error("测试多表单输出流关闭失败！", e);
            }
        }
    }

 因为springboot打成jar包，文件读取路径的问题，上述案例中ExcelPathUtils是我按照自己需求重写的，有需要的同学可以参考下。

/**
 * poi导出路径获取，解决jar包找不到路径的问题
 * 思路：将文件写入tomcat临时文件夹中
 * @author 小卖铺的老爷爷
 * @date 2018年12月26日
 */
public class ExcelPathUtils {
    public static String convertTemplatePath(String path) {
        // 如果是windows 则直接返回
        // if (System.getProperties().getProperty("os.name").contains("Windows")) {
        // return path;
        // }
        Resource resource = new ClassPathResource(path);
        FileOutputStream fileOutputStream = null;
        // 将模版文件写入到 tomcat临时目录
        String folder = System.getProperty("catalina.home");
        File tempFile = new File(folder + File.separator + path);
        // System.out.println("文件路径：" + tempFile.getPath());
        // 文件存在时 不再写入
        if (tempFile.exists()) {
            return tempFile.getPath();
        }
        File parentFile = tempFile.getParentFile();
        // 判断父文件夹是否存在
        if (!parentFile.exists()) {
            parentFile.mkdirs();
        }
        try {
            BufferedInputStream bufferedInputStream = new BufferedInputStream(resource.getInputStream());
            fileOutputStream = new FileOutputStream(tempFile);
            byte[] buffer = new byte[10240];
            int len = 0;
            while ((len = bufferedInputStream.read(buffer)) != -1) {
                fileOutputStream.write(buffer, 0, len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fileOutputStream != null) {
                try {
                    fileOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return tempFile.getPath();
    }

}