EasyExcel+Mybatisplus的输出Excel工具类

对EasyExcel进一步封装，方便自己使用。

工具类

依赖

		
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>easyexcelartifactId>
            <version>3.1.1version>
        dependency>

        
        <dependency>
            <groupId>com.baomidougroupId>
            <artifactId>mybatis-plus-boot-starterartifactId>
            <version>3.5.1version>
        dependency>
        <dependency>
            <groupId>com.baomidougroupId>
            <artifactId>mybatisplus-spring-boot-starterartifactId>
            <version>1.0.5version>
        dependency>
        
        <dependency>
            <groupId>cn.hutoolgroupId>
            <artifactId>hutool-coreartifactId>
            <version>5.5.1version>
        dependency>
        
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
        dependency>

public class EasyExcelUtil {
    @Data
    @Builder
    public static class ExcelParam{
        /** 查询 Mapper */
        private BaseMapper baseMapper;

        /** Lambda查詢方式 */
        private LambdaQueryWrapper lambdaQueryWrapper;

        /** 页码，默认从1开始 */
        private Integer pageNo = 1;

        /** 分页条数，,默认每个sheet 1000 条数据 */
        private Integer pageSize = 1000;

        /** 用于存放查询到的結果，让Excel生成 */
        private Class<?> respClazz;

        /** 生成的Excel 名称，不加后缀 */
        private String fileName;

        /** Excel sheet名称 */
        private String sheetName;
    }

    public static void exportExcel(ExcelParam excelParam, HttpServletResponse response){
        response.setContentType("application/vnd.ms-excel;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        response.setHeader(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS, HttpHeaders.CONTENT_DISPOSITION);
        response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + excelParam.getFileName() + ".xls");
        try (
                ServletOutputStream outputStream = response.getOutputStream();
                ExcelWriter excelWriter = EasyExcel.write(outputStream,excelParam.getRespClazz()).build();
        ) {
            Page page = new Page(excelParam.getPageNo(), excelParam.getPageSize());
            page = (Page) excelParam.getBaseMapper().selectPage(page, excelParam.getLambdaQueryWrapper());
            /** 构建 */
            WriteSheet writeSheet1 = EasyExcel.writerSheet(1, excelParam.getSheetName() + "第" + excelParam.getPageNo() + "页").build();
            /** 获取总数 */
            Long totalPage = page.getPages();
            List records = page.getRecords();
            /** 写入内容 */
            excelWriter.write(records, writeSheet1);
            writeSheet1 = null; // GC
            // 若为空表
            if (CollUtil.isEmpty(page.getRecords())) {
                /** 生成完毕 */
                excelWriter.finish();
                /** 立即刷回 */
                outputStream.flush();
                return;
            }
            for (int i = excelParam.pageNo + 1,index = 2; i <= totalPage; i++,index++) {
                /** 清空*/
                records.clear();
                WriteSheet writeSheet = EasyExcel.writerSheet(index, excelParam.getSheetName() + "第" + i + "页").build();
                page.setCurrent(i);
                /** 新的查询 */
                page = (Page) excelParam.getBaseMapper().selectPage(page,excelParam.getLambdaQueryWrapper());
                records = page.getRecords();
                /** 输入内容內容 */
                excelWriter.write(records, writeSheet);
            }
            /** 生成完毕 */
            excelWriter.finish();
            /** 立即刷回 */
            outputStream.flush();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

测试使用

@RestController
@Slf4j
@RequestMapping("/test")
@Api(tags = "测试模块")
public class TestController {
    @Autowired
    ApplicationMapper applicationMapper;

    @GetMapping
    public void test(HttpServletResponse httpServletResponse){
        EasyExcelUtil.ExcelParam p = EasyExcelUtil.ExcelParam.builder()
                .baseMapper(applicationMapper)
                .lambdaQueryWrapper(new LambdaQueryWrapper<Application>()
                        .eq(true,Application::getApplicationStatus,0)
                )
                .pageNo(2)
                .respClazz(RespTest.class)
                .pageSize(2)
                .fileName("test")
                .sheetName("测试sheet")
                .build();

        EasyExcelUtil.exportExcel(p,httpServletResponse);
    }
}

public class RespTest {

    @ExcelProperty(value = {"测试","id"},index = 0)
    private Long id;

    @ExcelProperty(value={"测试","名称"},index = 1)
    private String applicationName;

    @ExcelProperty(value = {"测试","状态"},index = 2)
    private Short applicationStatus;

    @ExcelProperty(value = {"测试","时间"},index = 3)
    private LocalDateTime createTime;

}

@Data
@TableName("tb_application")
@ApiModel(value = "Application对象", description = "")
public class Application implements Serializable {

    private static final long serialVersionUID = 1L;

    @ApiModelProperty("ID")
    @TableId(value = "id", type = IdType.ASSIGN_ID)
    private Long id;

    @ApiModelProperty("应用名称")
    private String applicationName;

    @ApiModelProperty("状态")
    private Short applicationStatus;

    @ApiModelProperty("创建时间")
    private LocalDateTime createTime;

}