导出excel，java后台生成

1、效果图

2、代码
1）工具类

package com.bootdo.common.utils;

import com.bootdo.biz.domain.ExcelDO;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder.BorderSide;

import javax.servlet.http.HttpServletResponse;
import java.awt.Color;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

public class ExcelUtils {

    /**
     * 使用浏览器选择路径下载
     * @param response
     * @param fileName
     * @param data
     * @throws Exception
     */
    public static void exportExcel(HttpServletResponse response, String fileName, ExcelDO data) throws Exception {
        // 告诉浏览器用什么软件可以打开此文件
        response.setHeader("content-Type", "application/vnd.ms-excel");
        // 下载文件的默认名称
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName + ".xls", "utf-8"));
        exportExcel(data, response.getOutputStream());
    }

    public static int generateExcel(ExcelDO ExcelDO, String path) throws Exception {
        File f = new File(path);
        FileOutputStream out = new FileOutputStream(f);
        return exportExcel(ExcelDO, out);
    }

    private static int exportExcel(ExcelDO data, OutputStream out) throws Exception {
        XSSFWorkbook wb = new XSSFWorkbook();
        int rowIndex = 0;
        try {
            String sheetName = data.getName();
            if (null == sheetName) {
                sheetName = "Sheet1";
            }
            XSSFSheet sheet = wb.createSheet(sheetName);
            rowIndex = writeExcel(wb, sheet, data);
            wb.write(out);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //此处需要关闭 wb 变量
            out.close();
        }
        return rowIndex;
    }

    /**
     * 表不显示字段
     * @param wb
     * @param sheet
     * @param data
     * @return
     */
//    private static int writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelDO data) {
//        int rowIndex = 0;
//        writeTitlesToExcel(wb, sheet, data.getTitles());
//        rowIndex = writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
//        autoSizeColumns(sheet, data.getTitles().size() + 1);
//        return rowIndex;
//    }

    /**
     * 表显示字段
     * @param wb
     * @param sheet
     * @param data
     * @return
     */
    private static int writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelDO data) {
        int rowIndex = 0;
        rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
        rowIndex = writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
        autoSizeColumns(sheet, data.getTitles().size() + 1);
        return rowIndex;
    }
    /**
     * 设置表头
     *
     * @param wb
     * @param sheet
     * @param titles
     * @return
     */
    private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List<String> titles) {
        int rowIndex = 0;
        int colIndex = 0;
        Font titleFont = wb.createFont();
        //设置字体
        titleFont.setFontName("simsun");
        //设置粗体
        titleFont.setBoldweight(Short.MAX_VALUE);
        //设置字号
        titleFont.setFontHeightInPoints((short) 14);
        //设置颜色
        titleFont.setColor(IndexedColors.BLACK.index);
        XSSFCellStyle titleStyle = wb.createCellStyle();
        //水平居中
        titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        //垂直居中
        titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        //设置图案颜色
        titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));
        //设置图案样式
        titleStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
        titleStyle.setFont(titleFont);
        setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));
        Row titleRow = sheet.createRow(rowIndex);
        titleRow.setHeightInPoints(25);
        colIndex = 0;
        for (String field : titles) {
            Cell cell = titleRow.createCell(colIndex);
            cell.setCellValue(field);
            cell.setCellStyle(titleStyle);
            colIndex++;
        }
        rowIndex++;
        return rowIndex;
    }

    /**
     * 设置内容
     *
     * @param wb
     * @param sheet
     * @param rows
     * @param rowIndex
     * @return
     */
    private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List<List<Object>> rows, int rowIndex) {
        int colIndex;
        Font dataFont = wb.createFont();
        dataFont.setFontName("simsun");
        dataFont.setFontHeightInPoints((short) 14);
        dataFont.setColor(IndexedColors.BLACK.index);

        XSSFCellStyle dataStyle = wb.createCellStyle();
        dataStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        dataStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
        dataStyle.setFont(dataFont);
        setBorder(dataStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));
        for (List<Object> rowData : rows) {
            Row dataRow = sheet.createRow(rowIndex);
            dataRow.setHeightInPoints(25);
            colIndex = 0;
            for (Object cellData : rowData) {
                Cell cell = dataRow.createCell(colIndex);
                if (cellData != null) {
                    cell.setCellValue(cellData.toString());
                } else {
                    cell.setCellValue("");
                }
                cell.setCellStyle(dataStyle);
                colIndex++;
            }
            rowIndex++;
        }
        return rowIndex;
    }

    /**
     * 自动调整列宽
     *
     * @param sheet
     * @param columnNumber
     */
    private static void autoSizeColumns(Sheet sheet, int columnNumber) {
        for (int i = 0; i < columnNumber; i++) {
            int orgWidth = sheet.getColumnWidth(i);
            sheet.autoSizeColumn(i, true);
            int newWidth = (int) (sheet.getColumnWidth(i) + 100);
            if (newWidth > orgWidth) {
                sheet.setColumnWidth(i, newWidth);
            } else {
                sheet.setColumnWidth(i, orgWidth);
            }
        }
    }

    /**
     * 设置边框
     *
     * @param style
     * @param border
     * @param color
     */
    private static void setBorder(XSSFCellStyle style, BorderStyle border, XSSFColor color) {
        style.setBorderTop(border);
        style.setBorderLeft(border);
        style.setBorderRight(border);
        style.setBorderBottom(border);
        style.setBorderColor(BorderSide.TOP, color);
        style.setBorderColor(BorderSide.LEFT, color);
        style.setBorderColor(BorderSide.RIGHT, color);
        style.setBorderColor(BorderSide.BOTTOM, color);
    }

    /**
     * 导入数据
     * @param inputStream
     * @return
     */
    public static List<Object[]> importExcel(InputStream inputStream) {
        try {
            List<Object[]> list = new ArrayList<>();
            Workbook workbook = WorkbookFactory.create(inputStream);
            Sheet sheet = workbook.getSheetAt(0);
            //获取sheet的行数
            int rows = sheet.getPhysicalNumberOfRows();
            for (int i = 0; i < rows; i++) {
                //过滤表头行
                if (i == 0) {
                    continue;
                }
                //获取当前行的数据
                Row row = sheet.getRow(i);
                Object[] objects = new Object[row.getPhysicalNumberOfCells()];
                int index = 0;
                for (Cell cell : row) {
                    if(cell.getCellType()==0) {
                        objects[index] = cell.getNumericCellValue();
                    }
                    if(cell.getCellType()==1){
                        objects[index] = cell.getStringCellValue();
                    }
                    index++;
                }
                list.add(objects);
            }
            return list;
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }
}

2）控制层

	@ResponseBody
	@RequestMapping(value="/excel")
	public void excel(@RequestParam Map<String, Object> params, HttpServletResponse response){

		int rowIndex = 0;
		ExcelDO data = new ExcelDO();
		data.setName("exports");
		List<String> titles = new ArrayList();
		titles.add("生产日期");	//1
		titles.add("入库日期");	//2
		titles.add("产品批号");	//3
		titles.add("规格（盒/箱）");	//4
		titles.add("产品箱数");	//5
		titles.add("产品盒数");	//6
		titles.add("产品总盒数");	//7
		titles.add("破损箱数");	//8
		titles.add("破损盒数");	//9
		titles.add("破损总盒数");	//10
		titles.add("实收箱数");	//11
		titles.add("实收盒数");	//12
		titles.add("实收总盒数");	//13
		titles.add("出库数量");	//14
		titles.add("库存盒数");	//15
		titles.add("存放地点");	//16
		data.setTitles(titles);
		
		List<CInstorageDO> cInstorageList = cInstorageService.list(params);
		List<List<Object>> rows = new ArrayList();
		for(int i = 0, length = cInstorageList.size();i<length;i++){
			CInstorageDO cInstorageDO = cInstorageList.get(i);
			List<Object> row = new ArrayList();

			row.add(DataCodeUtil.getStringDate(cInstorageDO.getProductDate()));
			row.add(DataCodeUtil.getStringDate(cInstorageDO.getInstorageDate()));
			row.add(cInstorageDO.getProductSn());
			row.add(cInstorageDO.getSpecsNum());
			row.add(cInstorageDO.getRecievedPackageNum());
			row.add(cInstorageDO.getReceivedBoxNum());
			row.add(cInstorageDO.getReceivedTotal());
			row.add(cInstorageDO.getDamagedPackageNum());
			row.add(cInstorageDO.getDamagedBoxNum());
			row.add(cInstorageDO.getDamagedTotal());
			row.add(cInstorageDO.getRealPackageNum());
			row.add(cInstorageDO.getRealBoxNum());
			row.add(cInstorageDO.getRealTotal());
			row.add(cInstorageDO.getOutNum());
			row.add(cInstorageDO.getStockNum());
			row.add(cInstorageDO.getStoragePlace());

			rows.add(row);
		}
		data.setRows(rows);

		try{
			String fileName ="县级库存";
			ExcelUtils.exportExcel(response,fileName,data);
		}catch (Exception e){
			e.printStackTrace();
		}
	}

3）前端js

function exports() {
    //运算符
    var comparisonOperator = $('#comparisonOperator').val();
    //库存盒数
    var stockNum = $('#stockNum').val();
    //生产批号
    var productSn = $('#productSn').val();
    //生产厂家
    var factoryId = $('#factoryId').val();
    //入库日期
    var instorageDate = $('#instorageDate').val();

    location.href = "/yyb/cInstorage/excel?comparisonOperator="+comparisonOperator+"&stockNum="+stockNum+"&productSn"
        +productSn+"&factoryId"+factoryId+"&instorageDate"+instorageDate;
}