后端导出excel自定义样式(easyExcel)
vue页面/** 导出按钮操作 */exportClick() {this.$confirm('是否确认导出所有离寝情况?', "警告", {confirmButtonText: "确定",cancelButtonText: "取消",type: "warning"}).then(() => {this.exportLoading = true;axios.requ
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话不多说直接上代码。。。。。
依赖，最新的poi放前面（最短路径优先原则），这样可以同时使用poi和easyexcel两种方式导入导出
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.1.2</version>
</dependency>
<!--easyexcel-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.2.8</version>
</dependency>
vue页面
/** 导出按钮操作 */
exportClick() {
this.$confirm('是否确认导出所有离寝情况?', "警告", {
confirmButtonText: "确定",
cancelButtonText: "取消",
type: "warning"
}).then(() => {
this.exportLoading = true;
axios.request({
method: 'post',
url: process.env.VUE_APP_BASE_API +`/modules/room/exportOnlineLeave`,
data: this.dataForm,
headers: {
Authorization: "Bearer " + getToken(),
},
responseType: 'blob'
}).then(res => {
const blob = new Blob([res.data], {type: 'application/vnd.ms-excel'})
let filename = '实时离寝情况报表.xlsx'
// 创建一个超链接，将文件流赋进去，然后实现这个超链接的单击事件
const elink = document.createElement('a')
elink.download = filename
elink.style.display = 'none'
elink.href = URL.createObjectURL(blob)
document.body.appendChild(elink)
elink.click()
URL.revokeObjectURL(elink.href) // 释放URL 对象
document.body.removeChild(elink)
this.exportLoading = false;
}).catch(() => {
});
})
},
后端controller
/**
* 导出学生实时在寝情况报表
*/
@PreAuthorize("@ss.hasPermi('modules:room:export')")
@PostMapping("/exportOnlineReturn")
public void exportDetailReturn(@RequestBody Map<String, Object> params, HttpServletResponse response) {
params.remove("pageSize");
List<BedExcelTemplateVo> list = faceBedService.selectBedOnlineBy(params);
response.setContentType("application/vnd.ms-excel");
response.setCharacterEncoding("utf-8");
response.setHeader("Content-disposition", "attachment;");
// 标题所占列数,数字取决于表头数量
String[] header = new String[5];
String fileName = "实时在寝情况报表";
try {
EasyExcel.write(response.getOutputStream(), BedExcelTemplateVo.class)
// 表头、内容样式设置
.registerWriteHandler(EasyExcelUtil.STYLE_STRATEGY)
// 行高,列宽
.registerWriteHandler(new CustomCellWriteHandler())
// 第一行标题样式设置
.registerWriteHandler(new FirstCellWriteHandler(fileName, header))
//设置写入表头信息开始的行数,0行为标题所占行数,因此从1行开始
.relativeHeadRowIndex(1)
.sheet(fileName)
.doWrite(list);
}catch (Exception e) {
throw new RuntimeException("下载报表异常");
}
}
三个拦截器: CustomCellWriteHandler,EasyExcelUtil,FirstCellWriteHandler
第一个设置表头、内容的行高、列宽样式,CustomCellWriteHandler
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.handler.AbstractCellWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import org.apache.poi.ss.usermodel.*;
import java.util.List;
public class CustomCellWriteHandler extends AbstractCellWriteHandler {
@Override
public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
if (row.getRowNum() == 1) {
row.setHeight((short) 500);
}else {
short height = 400;
row.setHeight(height);
}
}
@Override
public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
int cellIndex = cell.getColumnIndex();
int columnWidth = 25;
writeSheetHolder.getSheet().setColumnWidth(cellIndex, columnWidth * 256);
}
}
第二个设置标题样式,FirstCellWriteHandler
import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
public class FirstCellWriteHandler implements SheetWriteHandler {
private final String title;
private final String[] header;
public FirstCellWriteHandler(String title, String[] header) {
this.title = title;
this.header = header;
}
@Override
public void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
}
@Override
public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
Workbook workbook = writeWorkbookHolder.getWorkbook();
Sheet sheet = workbook.getSheetAt(0);
//设置标题
Row row1 = sheet.createRow(0);
row1.setHeight((short) 600);
Cell cell = row1.createCell(0);
//设置单元格内容
cell.setCellValue(title);
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
cellStyle.setAlignment(HorizontalAlignment.CENTER);
Font font = workbook.createFont();
font.setBold(true);
font.setFontHeight((short) 300);
cellStyle.setFont(font);
cell.setCellStyle(cellStyle);
// 第一行大标题占位设置
sheet.addMergedRegionUnsafe(new CellRangeAddress(0, 0, 0, header.length-1));
}
}
第三个设置表头、内容的样式,EasyExcelUtil
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import org.apache.poi.ss.usermodel.*;
import java.util.LinkedList;
import java.util.List;
public class EasyExcelUtil {
// 样式策略封装
public final static HorizontalCellStyleStrategy STYLE_STRATEGY;
static {
STYLE_STRATEGY = new HorizontalCellStyleStrategy(getHeadStyle(),getContentStyle());
}
/**动态头传入,设置标题,难以自定义标题样式与表头样式不同*/
public static List<List<String>> head(String[] header, String bigTitle) {
List<String> head0 = null;
List<List<String>> list = new LinkedList<List<String>>();
for (String h : header) {
head0 = new LinkedList<>();
head0.add(bigTitle);
head0.add(h);
list.add(head0);
}
return list;
}
/**动态头传入,不设置标题, 标题另外拦截处理*/
public static List<List<String>> head2(String[] header) {
List<String> head0 = null;
List<List<String>> list = new LinkedList<List<String>>();
for (String h : header) {
head0 = new LinkedList<>();
head0.add(h);
list.add(head0);
}
return list;
}
/**
* 简单样式，合并定义
*/
public static HorizontalCellStyleStrategy styleWrite() {
// 头的策略
WriteCellStyle headWriteCellStyle = new WriteCellStyle();
//背景设置为白色
headWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
WriteFont headWriteFont = new WriteFont();
headWriteFont.setFontHeightInPoints((short)20);
headWriteCellStyle.setWriteFont(headWriteFont);
// 内容的策略
WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
// 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND 不然无法显示背景颜色.头默认了 FillPatternType所以可以不指定
contentWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
// 背景绿色
contentWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
WriteFont contentWriteFont = new WriteFont();
// 字体大小
contentWriteFont.setFontHeightInPoints((short)20);
contentWriteCellStyle.setWriteFont(contentWriteFont);
// 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现
return new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);
}
/**
* 分开定义，表头样式
*/
public static WriteCellStyle getHeadStyle(){
// 头的策略
WriteCellStyle headWriteCellStyle = new WriteCellStyle();
// 背景颜色
headWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
headWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
// 字体
WriteFont headWriteFont = new WriteFont();
//设置字体名字
headWriteFont.setFontName("黑体");
//设置字体大小
headWriteFont.setFontHeightInPoints((short)12);
//字体加粗
headWriteFont.setBold(true);
//在样式用应用设置的字体;
headWriteCellStyle.setWriteFont(headWriteFont);
//样式 设置底边框;
headWriteCellStyle.setBorderBottom(BorderStyle.THIN);
//设置底边框颜色;
headWriteCellStyle.setBottomBorderColor((short) 0);
//设置左边框;
headWriteCellStyle.setBorderLeft(BorderStyle.THIN);
//设置左边框颜色;
headWriteCellStyle.setLeftBorderColor((short) 0);
//设置右边框;
headWriteCellStyle.setBorderRight(BorderStyle.THIN);
//设置右边框颜色;
headWriteCellStyle.setRightBorderColor((short) 0);
//设置顶边框;
headWriteCellStyle.setBorderTop(BorderStyle.THIN);
//设置顶边框颜色;
headWriteCellStyle.setTopBorderColor((short) 0);
//设置自动换行;
headWriteCellStyle.setWrapped(true);
//设置水平对齐的样式为居中对齐;
headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
//设置垂直对齐的样式为居中对齐;
headWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
// headWriteCellStyle.setShrinkToFit(true);//设置文本收缩至合适
return headWriteCellStyle;
}
/**
* 分开定义，内容样式
*/
public static WriteCellStyle getContentStyle(){
// 内容的策略
WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
// 背景绿色
// 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND 不然无法显示背景颜色.头默认了 FillPatternType所以可以不指定
contentWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
contentWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
// 设置字体
WriteFont contentWriteFont = new WriteFont();
//设置字体大小
contentWriteFont.setFontHeightInPoints((short) 10);
//设置字体名字
contentWriteFont.setFontName("宋体");
//在样式用应用设置的字体;
contentWriteCellStyle.setWriteFont(contentWriteFont);
//样式 设置底边框;
contentWriteCellStyle.setBorderBottom(BorderStyle.THIN);
//设置底边框颜色;
contentWriteCellStyle.setBottomBorderColor(IndexedColors.GREY_25_PERCENT.getIndex());
//设置左边框;
contentWriteCellStyle.setBorderLeft(BorderStyle.THIN);
//设置左边框颜色;
contentWriteCellStyle.setLeftBorderColor(IndexedColors.GREY_25_PERCENT.getIndex());
//设置右边框;
contentWriteCellStyle.setBorderRight(BorderStyle.THIN);
//设置右边框颜色;
contentWriteCellStyle.setRightBorderColor(IndexedColors.GREY_25_PERCENT.getIndex());
//设置顶边框;
contentWriteCellStyle.setBorderTop(BorderStyle.THIN);
///设置顶边框颜色;
contentWriteCellStyle.setTopBorderColor(IndexedColors.GREY_25_PERCENT.getIndex());
// 水平居中
contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
// 垂直居中
contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
//设置自动换行;
contentWriteCellStyle.setWrapped(true);
//设置单元格格式是：文本格式，方式长数字文本科学计数法
contentWriteCellStyle.setDataFormat((short)49);
// contentWriteCellStyle.setShrinkToFit(true);//设置文本收缩至合适
return contentWriteCellStyle;
}
}
ps:除了自定义拦截器CustomCellWriteHandler(适用于不封装实体类，动态表头)更改行高列宽外，行高也可以通过@HeadRowHeight(xx)和@ContentRowHeight(xx)注解实现，列宽可以通过@ColumnWidth(xx)实现，前提都要封装实体类。这里最好自定义一个vo类（一种实体类类型）——视图对象，用于展示层，它的作用是把某个指定页面（或组件）的所有数据封装起来。作为导出模板，BedExcelTemplateVo就不贴出来了，就是简单的实体类。不搞个实体类封装真的很头疼，搞动态头之类的东西浪费时间（除非真的需要动态字段）
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