一份完整的POI导出Excel代码

HTML:

<a href="#" class="easyui-linkbutton" onclick="exportExcel()" data-options="iconCls:'icon-excel',plain:true">导出报表</a>

JS:

//导出报表
function exportExcel() {
    window.top.$.messager.confirm("提示", "确认导出吗? ", function(r) {
        if (r) {
            window.open("/xxexport/entranceToExport");
        }
    });
}

 JAVA:

package com.missy.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.net.URLEncoder;

import org.apache.commons.io.FileUtils;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.github.pagehelper.Page;
import com.github.pagehelper.util.StringUtil;
import com.gomai.sinomach.oms.mcagency.data.XxData;
import com.gomai.sinomach.oms.mcagency.service.XxService;
import com.siims.framework.utils.ActionUtil;
import com.siims.sinomach.sys.org.data.SysOrgData;
import com.siims.sinomach.sys.org.service.SysOrgService;

import net.sf.json.JSONObject;

/**
 * XXexcel导出
 * 
 * @author ywy
 * @date 2020-09-02
 */
@RestController
@RequestMapping("/xxexport")
public class XxExportController {

    @Autowired
    private XxService XxService;

    /**
     * 导表入口
     * 
     * @param entity     查询条件
     * @author ywy
     * @date 2020-09-02
     * @return
     */
    @SuppressWarnings("resource")
    @RequestMapping(value = "/entranceToExport")
    public ResponseEntity<?> entranceToExport(XxData entity) {
        JSONObject json = new JSONObject();
        json.put("success", false);
        json.put("msg", "导出失败！");
        OutputStream out = null;
        try {
            FileInputStream tps = new FileInputStream(
                    new File(new StringBuffer().append(ActionUtil.getRequest().getServletContext().getRealPath("/"))
                            .append("fileTemplate/xx导出模板.xlsx").toString()));// 拿到模板文件
            File file = new File(new StringBuffer().append(System.getProperty("java.io.tmpdir")).append(File.separator)
                    .append("xx统计表.xlsx").toString());// 提示下载文件
            out = new FileOutputStream(file);
            XSSFWorkbook workbook = new XSSFWorkbook();// 新建一个Excel的工作空间
            workbook = new XSSFWorkbook(tps);// 把模板复制到新建的Excel
            setSheetOne(workbook, entity);// 填充数据
            workbook.write(out);// 输出Excel内容，生成Excel文件
            out.flush();
            out.close();

            HttpHeaders headers = new HttpHeaders();
            headers.setContentDispositionFormData("attachment", URLEncoder.encode(file.getName(), "UTF-8"));
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.OK);
        } catch (Exception e) {
            json.put("success", false);
            json.put("msg", "导出失败！");
            e.printStackTrace();
        }
        return null;

    }

    /**
     * 处理数据
     * 
     * @param workbook
     * @param entity     查询条件
     * @return XSSFWorkbook
     * @author ywy
     * @date 2020-09-02
     */
    private XSSFWorkbook setSheetOne(XSSFWorkbook workbook, XxData entity) throws Exception {
        Sheet sheet = workbook.getSheetAt(0);
        Page<XxData> list = XxService.getXxList(entity);
        if (list.size() > 0) {
            XSSFCellStyle cellStyle = workbook.createCellStyle();// 单元格样式
            cellStyle.setWrapText(true);// 自动换行
            cellStyle.setAlignment(HorizontalAlignment.CENTER);// 水平居中
            cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 垂直居中
            cellStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderRight(XSSFCellStyle.BORDER_THIN);
            cellStyle.setBorderTop(XSSFCellStyle.BORDER_THIN);
            Font font = workbook.createFont();
            font.setFontName("仿宋_GB2312");
            font.setFontHeightInPoints((short) 12);
            cellStyle.setFont(font);
            int rowNum = 3;// 行索引
            for (int i = 0; i < list.size(); i++) {
                if(list.get(i) != null) {
                    handelRowData(sheet.createRow(rowNum++), list.get(i), cellStyle, (i+1));
                }
            }
        }
        return workbook;
    }

    /**
     * 处理行数据
     * 
     * @param tempRow         行对象
     * @param XxData   要处理的信息
     * @param cellStyle 单元格样式
     * @param dataNum 数据的序号
     * @return Row
     * @throws Exception
     * @author ywy
     * @date 2020-09-02
     */
    private Row handelRowData(Row tempRow, XxData XxData, XSSFCellStyle cellStyle, int dataNum)
            throws Exception {
        int cellIndex = 0;// 单元格索引
        final String EMPTY = "无";// 空字符
        // 给单元格插入值
        handleCell(tempRow, cellIndex++, cellStyle, dataNum);// 序号
        handleCell(tempRow, cellIndex++, cellStyle, StringUtil.isEmpty(XxData.getUserName) ? EMPTY : XxData.getUserName());// 姓名
        handleCell(tempRow, cellIndex++, cellStyle, StringUtil.isEmpty(XxData.getPhoneNum()) ? EMPTY : XxData.getPhoneNum());// 电话
        return tempRow;
    }
    

    /**
     * 给单元格插入值
     * @param row 行对象
     * @param cellIndex 单元格索引
     * @param cellStyle 单元格样式
     * @param cellValue 单元格的值 Integer类型
     * @return Cell
     * @throws Exception
     * @author ywy
     * @date 2020-09-02
     */
    private Cell handleCell(Row row, int cellIndex, XSSFCellStyle cellStyle, Integer cellValue) throws Exception {
        Cell cell = row.createCell(cellIndex);
        cell.setCellStyle(cellStyle);
        cell.setCellValue(cellValue);
        return cell;
    }
    
    /**
     * 给单元格插入值
     * @param row 行对象
     * @param cellIndex 单元格索引
     * @param cellStyle 单元格样式
     * @param cellValue 单元格的值 String类型
     * @return Cell
     * @throws Exception
     * @author ywy
     * @date 2020-09-02
     */
    private Cell handleCell(Row row, int cellIndex, XSSFCellStyle cellStyle, String cellValue) throws Exception {
        Cell cell = row.createCell(cellIndex);
        cell.setCellStyle(cellStyle);
        cell.setCellValue(cellValue);
        return cell;
    }
    
}

导出模板文件存放：