使用easyexcel导出excel表格

想要将数据使用excel表格导出，可以使用easyexcel

pom.xml

		<dependency>
            <groupId>com.alibabagroupId>
            <artifactId>easyexcelartifactId>
            <version>3.0.5version>
        dependency>

ExcelUtil

@Component
public class ExcelUtil {

    public static Map<Integer,String> addTop(String str) {
        Map<Integer,String> topMap = new HashMap<Integer,String>();
        topMap.put(0,str);
        return topMap;
    }

    public static Map<Integer,String> addStatistic(List<ExampleInfo> list) {
        Map<Integer,String> statisticMap = new HashMap<Integer,String>();
        statisticMap.put(0,null);
        for (int i =0; i<list.size(); i++) {
            statisticMap.put( i+1 , list.get(i).getOrgName());
        }
        return statisticMap;
    }

    public static Map<Integer,String> addNum(List<ExampleInfo> list) {
        Map<Integer,String> numMap = new HashMap<Integer,String>();
        numMap.put(0,null);
        for (int i =0; i<list.size(); i++) {
            numMap.put( i+1 , list.get(i).getCount().toString());
        }
        return numMap;
    }
}

ExampleInfo

@Data
@AllArgsConstructor
@NoArgsConstructor
public class ExampleInfo {
    private Integer id;
    private String orgName;
    private Integer count = 0;
}

CustomCellWriteHandler

public class CustomCellWriteHandler implements CellWriteHandler {

    public void afterCellDispose(CellWriteHandlerContext context) {
        Cell cell = context.getCell();
        int rowIndex = cell.getRowIndex();
        int cellIndex = cell.getColumnIndex();

        // 自定义样式处理
        // 当前事件会在 数据设置到poi的cell里面才会回调
        // 判断不是头的情况 如果是fill 的情况 这里会==null 所以用not true
        if (BooleanUtils.isNotTrue(context.getHead())) {
            if (cell.getRowIndex() == 0 && StringUtils.isNotBlank(cell.getStringCellValue())) {
                // 拿到poi的workbook
                Workbook workbook = context.getWriteWorkbookHolder().getWorkbook();
                // 这里千万记住 想办法能复用的地方把他缓存起来 一个表格最多创建6W个样式
                // 不同单元格尽量传同一个 cellStyle
                CellStyle cellStyle = workbook.createCellStyle();
                Font font = workbook.createFont();
                font.setColor(Font.COLOR_RED);
                cellStyle.setFont(font);
                cellStyle.setAlignment(HorizontalAlignment.CENTER);
                cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
                cell.setCellStyle(cellStyle);
                // 由于这里没有指定dataformat 最后展示的数据 格式可能会不太正确
                // 这里要把 WriteCellData的样式清空， 不然后面还有一个拦截器 FillStyleCellWriteHandler 默认会将 WriteCellStyle 设置到
                // cell里面去 会导致自己设置的不一样（很关键）
                context.getFirstCellData().setWriteCellStyle(null);
            } else if (cell.getRowIndex() == 1 && StringUtils.isNotBlank(cell.getStringCellValue())) {
                Workbook workbook = context.getWriteWorkbookHolder().getWorkbook();
                CellStyle cellStyle = workbook.createCellStyle();
                //背景颜色
                cellStyle.setFillForegroundColor(IndexedColors.YELLOW.getIndex());
                // 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND
                cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
                cellStyle.setWrapText(true);//设置自动换行
                cellStyle.setAlignment(HorizontalAlignment.CENTER);
                cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
                cellStyle.setBorderBottom(BorderStyle.THIN); //下边框
                cellStyle.setBorderLeft(BorderStyle.THIN);//左边框
                cellStyle.setBorderTop(BorderStyle.THIN);//上边框
                cellStyle.setBorderRight(BorderStyle.THIN);//右边框
                cell.setCellStyle(cellStyle);
                Sheet sheet = cell.getSheet();
                for (int i = 0; i < cellIndex; i++) {
                    sheet.setColumnWidth(i + 1,5000);
                }
                context.getFirstCellData().setWriteCellStyle(null);
            } else if (cell.getRowIndex() == 2 && StringUtils.isNotBlank(cell.getStringCellValue())) {
                Workbook workbook = context.getWriteWorkbookHolder().getWorkbook();
                CellStyle cellStyle = workbook.createCellStyle();
                Font font = workbook.createFont();
                font.setColor(Font.COLOR_RED);
                cellStyle.setFont(font);
                cellStyle.setWrapText(true);//设置自动换行
                cellStyle.setAlignment(HorizontalAlignment.CENTER);
                cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
                cellStyle.setBorderBottom(BorderStyle.THIN); //下边框
                cellStyle.setBorderLeft(BorderStyle.THIN);//左边框
                cellStyle.setBorderTop(BorderStyle.THIN);//上边框
                cellStyle.setBorderRight(BorderStyle.THIN);//右边框
                cell.setCellStyle(cellStyle);
                context.getFirstCellData().setWriteCellStyle(null);
            } else if (cell.getRowIndex() == 3 && StringUtils.isNotBlank(cell.getStringCellValue())) {
                Workbook workbook = context.getWriteWorkbookHolder().getWorkbook();
                CellStyle cellStyle = workbook.createCellStyle();
                Font font = workbook.createFont();
                font.setColor(Font.COLOR_RED);
                cellStyle.setFont(font);
                cellStyle.setWrapText(true);//设置自动换行
                cellStyle.setAlignment(HorizontalAlignment.LEFT);
                cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
                cell.setCellStyle(cellStyle);
                context.getFirstCellData().setWriteCellStyle(null);
            } else if (cell.getRowIndex() == 4 && StringUtils.isNotBlank(cell.getStringCellValue())) {
                Workbook workbook = context.getWriteWorkbookHolder().getWorkbook();
                CellStyle cellStyle = workbook.createCellStyle();
                cellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
                cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
                cellStyle.setWrapText(true);//设置自动换行
                cellStyle.setAlignment(HorizontalAlignment.CENTER);
                cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
                cellStyle.setBorderBottom(BorderStyle.THIN); //下边框
                cellStyle.setBorderLeft(BorderStyle.THIN);//左边框
                cellStyle.setBorderTop(BorderStyle.THIN);//上边框
                cellStyle.setBorderRight(BorderStyle.THIN);//右边框
                if (cell.getColumnIndex() == 1) {
                    Font font = workbook.createFont();
                    font.setColor(Font.COLOR_RED);
                    cellStyle.setFont(font);
                }
                cell.setCellStyle(cellStyle);
                context.getFirstCellData().setWriteCellStyle(null);
            } else if (cell.getRowIndex() > 4 && cell.getColumnIndex() <= 11) {
                Workbook workbook = context.getWriteWorkbookHolder().getWorkbook();
                CellStyle cellStyle = workbook.createCellStyle();
                cellStyle.setWrapText(true);//设置自动换行
                cellStyle.setAlignment(HorizontalAlignment.CENTER);
                cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
                cellStyle.setBorderBottom(BorderStyle.THIN); //下边框
                cellStyle.setBorderLeft(BorderStyle.THIN);//左边框
                cellStyle.setBorderTop(BorderStyle.THIN);//上边框
                cellStyle.setBorderRight(BorderStyle.THIN);//右边框
                if (cell.getColumnIndex() == 1) {
                    Font font = workbook.createFont();
                    font.setColor(Font.COLOR_RED);
                    cellStyle.setFont(font);
                }
                cell.setCellStyle(cellStyle);
                context.getFirstCellData().setWriteCellStyle(null);
            }
        }
    }

}

ExcelTestController

@RestController
@Api(tags = "测试excel表格导出")
@RequestMapping("/excel")
@Slf4j
public class ExcelTestController {
    @GetMapping("/export")
    public Object exportDataReport(HttpServletResponse response) {
        List<Map<Integer,String>> firstDataList = new ArrayList<Map<Integer,String>>();
        List<Map<Integer,String>> midDataList = new ArrayList<Map<Integer,String>>();
        List<Map<Integer,String>> finDataList = new ArrayList<Map<Integer,String>>();

        //日期转换格式
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日");
        Calendar yesterday=Calendar.getInstance();
        Calendar tomorrow=Calendar.getInstance();
        Calendar theDayAfterTomorrow=Calendar.getInstance();
        //昨天
        yesterday.add(Calendar.DATE, -1);
        //明天
        tomorrow.add(Calendar.DATE, 1);
        //后天
        theDayAfterTomorrow.add(Calendar.DATE, 2);

        String firstTop = simpleDateFormat.format(new Date()) + "测试名单1";
        String midTop = simpleDateFormat.format(new Date()) + "测试名单2";
        String finTop = simpleDateFormat.format(theDayAfterTomorrow.getTime()) + "测试名单3";

        firstDataList.add(ExcelUtil.addTop(firstTop));
        midDataList.add(ExcelUtil.addTop(midTop));
        finDataList.add(ExcelUtil.addTop(finTop));

        List<ExampleInfo> firstResult = new ArrayList<ExampleInfo>();
        firstResult.add(0,new ExampleInfo(1,"测试1",1));
        firstResult.add(1,new ExampleInfo(2,"测试2",2));
        firstResult.add(2,new ExampleInfo(3,"测试3",3));
        firstResult.add(3,new ExampleInfo(4,"测试4",4));
        firstResult.add(4,new ExampleInfo(5,"测试5",5));
        List<ExampleInfo> midResult = new ArrayList<ExampleInfo>();
        midResult.add(0,new ExampleInfo(1,"测试1",1));
        midResult.add(1,new ExampleInfo(2,"测试2",2));
        midResult.add(2,new ExampleInfo(3,"测试3",3));
        midResult.add(3,new ExampleInfo(4,"测试4",4));
        midResult.add(4,new ExampleInfo(5,"测试5",5));
        List<ExampleInfo> finResult = new ArrayList<ExampleInfo>();
        finResult.add(0,new ExampleInfo(1,"测试1",1));
        finResult.add(1,new ExampleInfo(2,"测试2",2));
        finResult.add(2,new ExampleInfo(3,"测试3",3));
        finResult.add(3,new ExampleInfo(4,"测试4",4));
        finResult.add(4,new ExampleInfo(5,"测试5",5));

        firstDataList.add(ExcelUtil.addStatistic(firstResult));
        midDataList.add(ExcelUtil.addStatistic(midResult));
        finDataList.add(ExcelUtil.addStatistic(finResult));

        firstDataList.add(ExcelUtil.addNum(firstResult));
        midDataList.add(ExcelUtil.addNum(midResult));
        finDataList.add(ExcelUtil.addNum(finResult));

        Map<Integer,String> titleMap = new HashMap<Integer,String>();
        titleMap.put(0,"详细数据:");
        firstDataList.add(titleMap);
        midDataList.add(titleMap);
        finDataList.add(titleMap);

        Map<Integer,String> headMap = new HashMap<Integer,String>();
        headMap.put(0,"标题1");
        headMap.put(1,"标题2");
        headMap.put(2,"标题3");
        headMap.put(3,"标题4");
        headMap.put(4,"标题5");
        headMap.put(5,"标题6");
        headMap.put(6,"标题7");
        headMap.put(7,"标题8");
        headMap.put(8,"标题9");
        headMap.put(9,"标题10");
        firstDataList.add(headMap);
        midDataList.add(headMap);
        finDataList.add(headMap);

        firstDataList = this.addlist(firstDataList);
        midDataList = this.addlist(midDataList);
        finDataList = this.addlist(finDataList);

        String fileName = String.format("D:\\testexcel\\%s","测试表格导出.xlsx");
        ExcelWriter excelWriter = EasyExcel.write(fileName).build(); // 本地
        //前端下载
//        ExcelWriter excelWriter = EasyWriteUtils.getExcelWriter(response,"excel表格.xlsx");
        OnceAbsoluteMergeStrategy firstOnceAbsoluteMergeStrategy = new OnceAbsoluteMergeStrategy(0, 0, 0, firstResult.size());
        OnceAbsoluteMergeStrategy midOnceAbsoluteMergeStrategy = new OnceAbsoluteMergeStrategy(0, 0, 0, midResult.size());
        OnceAbsoluteMergeStrategy finOnceAbsoluteMergeStrategy = new OnceAbsoluteMergeStrategy(0, 0, 0, finResult.size());
        OnceAbsoluteMergeStrategy onceAbsoluteMergeStrategy1 = new OnceAbsoluteMergeStrategy(3, 3, 0, 9);
        WriteCellStyle headWriteCellStyle = new WriteCellStyle();

        //内容策略
        WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
        //设置 水平居中
        contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);

        //设置 自动换行
        contentWriteCellStyle.setWrapped(true);
        //设置 垂直居中
        contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        //设置 水平居中
        contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);

        HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);

        WriteSheet sheet1 = EasyExcel.writerSheet(1, "模板1").registerWriteHandler(firstOnceAbsoluteMergeStrategy).registerWriteHandler(onceAbsoluteMergeStrategy1).registerWriteHandler(horizontalCellStyleStrategy).registerWriteHandler(new CustomCellWriteHandler()).build();
        WriteSheet sheet2 = EasyExcel.writerSheet(2, "模板2").registerWriteHandler(midOnceAbsoluteMergeStrategy).registerWriteHandler(onceAbsoluteMergeStrategy1).registerWriteHandler(horizontalCellStyleStrategy).registerWriteHandler(new CustomCellWriteHandler()).build();
        WriteSheet sheet3 = EasyExcel.writerSheet(3, "模板3").registerWriteHandler(finOnceAbsoluteMergeStrategy).registerWriteHandler(onceAbsoluteMergeStrategy1).registerWriteHandler(horizontalCellStyleStrategy).registerWriteHandler(new CustomCellWriteHandler()).build();
        excelWriter.write(firstDataList,sheet1);
        excelWriter.write(midDataList,sheet2);
        excelWriter.write(finDataList,sheet3);
        excelWriter.finish();
        try {
            response.flushBuffer();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public List<Map<Integer,String>> addlist(List<Map<Integer,String>> list) {
        for (int i = 0; i <= 10; i++) {
            Map<Integer,String> map = new HashMap<Integer,String>();
            map.put(0,"测试1");
            map.put(1,"测试2");
            map.put(2,"测试3");
            map.put(3,"测试4");
            map.put(4,"测试5");
            map.put(5,"测试6");
            map.put(6,"测试7");
            map.put(7,"测试8");
            map.put(8,"测试9");
            map.put(9,"测试10");
            list.add(map);
        }
        return list;
    }
}

效果图