Springboot实现前后端分离excel下载

    @GetMapping("export")
    public void exportExcel() {
        XSSFWorkbook workbook = placeStatService.exportExcel();
        // 设置生成的Excel的文件名，并以中文进行编码
        String fileName = null;
        try {
            fileName = URLEncoder.encode("房间预约使用统计表" + ".xlsx", "utf-8").replaceAll("\\+", "%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        response.setCharacterEncoding("UTF-8");
        response.setHeader("Content-type", "application/vnd.ms-excel");
        response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
        // 响应类型,编码
        response.setContentType("application/octet-stream;charset=UTF-8");
        try {
            // 形成输出流
            OutputStream osOut = response.getOutputStream();
            // 将指定的字节写入此输出流
            workbook.write(osOut);
            // 刷新此输出流并强制将所有缓冲的输出字节被写出
            osOut.flush();
            // 关闭流
            osOut.close();
            workbook.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

@Override
    public XSSFWorkbook exportExcel) {
        List<RoomOrderDetailModel> roomOrdersList = getRoomOrderList();
        XSSFWorkbook data = ExcelUtil.setExcelData(roomOrdersList);
        return data;
    }
 

package com.util; 
import com.curefun.place.model.RoomOrderDetailModel;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook; 
import java.text.SimpleDateFORMat;
import java.util.Date;
import java.util.List;
 

public class ExcelUtil { 
 
    
    public static XSSFWorkbook setExcelData(List<RoomOrderDetailModel> orderDetailModels) {
        //创建一个book，对应一个Excel文件
        XSSFWorkbook workbook = new XSSFWorkbook();
        //在book中添加一个sheet,对应Excel文件中的sheet
        XSSFSheet sheet = workbook.createSheet("教室预约使用记录");
        //设置六列的宽度
        sheet.setColumnWidth(0, 4000);
        sheet.setColumnWidth(1, 3000);
        sheet.setColumnWidth(2, 3800);
        sheet.setColumnWidth(3, 2800);
        sheet.setColumnWidth(4, 3200);
        sheet.setColumnWidth(5, 3600);
        sheet.setColumnWidth(6, 2850);
 
        //居中的样式
        XSSFCellStyle centerStyle = getCenterStyle(workbook);
 
        // 第三步，在sheet中添加表头第0行
        XSSFRow row0 = sheet.createRow(0);
        setFirstRow(centerStyle, row0);
 
        int rowNum = 1;
        for (RoomOrderDetailModel model : orderDetailModels) {
            XSSFRow row = sheet.createRow(rowNum);
            row.createCell(0).setCellValue(rowNum);
            rowNum++;
            row.createCell(1).setCellValue(model.getBuildingName());
            row.createCell(2).setCellValue(model.getRoomNo());
            row.createCell(3).setCellValue(model.getRoomName());
            row.createCell(4).setCellValue(model.getEventType());
            row.createCell(5).setCellValue(model.getEventName());
            row.createCell(6).setCellValue(model.getUserRealName());
        }
        return workbook;
    }  
 
    
    private static XSSFCellStyle getCenterStyle(XSSFWorkbook workbook) {
        XSSFCellStyle cellStyle = workbook.createCellStyle();
        //设置水平对齐的样式为居中对齐;
        cellStyle.setAlignment(HorizontalAlignment.CENTER);
        //垂直居中
        cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        return cellStyle;
    } 
 
    
    private static void setFirstRow(XSSFCellStyle centerStyle, XSSFRow row) {
        XSSFCell cell0 = row.createCell(0);
        cell0.setCellValue("序号");
        cell0.setCellStyle(centerStyle);
        XSSFCell cell1 = row.createCell(1);
        cell1.setCellValue("楼栋信息");
        cell1.setCellStyle(centerStyle);
        XSSFCell cell2 = row.createCell(2);
        cell2.setCellValue("房号");
        cell2.setCellStyle(centerStyle);
        XSSFCell cell3 = row.createCell(3);
        cell3.setCellValue("房间名称");
        cell3.setCellStyle(centerStyle);
        XSSFCell cell4 = row.createCell(4);
        cell4.setCellValue("活动类型");
        cell4.setCellStyle(centerStyle);
        XSSFCell cell5 = row.createCell(5);
        cell5.setCellValue("活动名称");
        cell5.setCellStyle(centerStyle);
        XSSFCell cell6 = row.createCell(6);
        cell6.setCellValue("使用人");
        cell6.setCellStyle(centerStyle); 

    } 
}

this.$.ajax({
                url :this.url + "/",
                type : 'post',
                data : formData,
                contentType: false,
                processData: false,
                xhrFields: {withCredentials: true, responseType:'arraybuffer'},
                headers : {'Access-Control-Allow-Origin': '*', "Authorization": this.ajaxRequest.getToken()},
                success: function (res, textStatus, request) {
                    var downloadFile = document.createElement('a');
                    let blob = new Blob([res], {type : "application/vnd.ms-excel;charset=UTF-8"});
                    downloadFile.href = window.URL.createObjectURL(blob);
                    console.log(request.getResponseHeader('Content-disposition'));
                    downloadFile.download = 
                    decodeURI(request.getResponseHeader('Content-disposition').split('filename=')[1] );
                    downloadFile.click();
                    window.URL.revokeObjectURL(downloadFile.href);
                },
                error : function (res) {
                  console.log(res)
                }
        })

// 输出Excel文件
OutputStream out = null;
out = response.getOutputStream();
response.reset();
response.setCharacterEncoding("UTF-8");
response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF8"));
response.setContentType("application/vnd.ms-excel; charset=utf-8");
// 输出Excel内容，生成Excel文件
wb.write(out);