1.ExportUtil 导出工具类

package com.wangzou.myweb.util;

import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExportUtil {

private XSSFWorkbook wb = null;

private XSSFSheet sheet = null;

/** 
       * @param wb 
       * @param sheet 
      */  
     public ExportUtil(XSSFWorkbook wb, XSSFSheet sheet)  
     {  
         this.wb = wb;  
          this.sheet = sheet;  
      }

/**
 * 合并单元格后给合并后的单元格加边框
 * 
 * @param region
 * @param cs
 */
public void setRegionStyle(CellRangeAddress region, XSSFCellStyle cs) {

    int toprowNum = region.getFirstRow();
    for (int i = toprowNum; i <= region.getLastRow(); i++) {
        XSSFRow row = sheet.getRow(i);
        for (int j = region.getFirstColumn(); j <= region.getLastColumn(); j++) {
            XSSFCell cell = row.getCell(j);// XSSFCellUtil.getCell(row,
                                            // (short) j);
            cell.setCellStyle(cs);
        }
    }
}

/**
 * 设置表头的单元格样式
 * 
 * @return
 */
public XSSFCellStyle getHeadStyle() {
    // 创建单元格样式
    XSSFCellStyle cellStyle = wb.createCellStyle();
    // 设置单元格的背景颜色为淡蓝色
    cellStyle.setFillForegroundColor(HSSFColor.PALE_BLUE.index);
    cellStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
    // 设置单元格居中对齐
    cellStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
    // 设置单元格垂直居中对齐
    cellStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
    // 创建单元格内容显示不下时自动换行
    cellStyle.setWrapText(true);
    // 设置单元格字体样式
    XSSFFont font = wb.createFont();
    // 设置字体加粗
    font.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);
    font.setFontName("宋体");
    font.setFontHeight((short) 200);
    cellStyle.setFont(font);
    // 设置单元格边框为细线条
    cellStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN);
    cellStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN);
    cellStyle.setBorderRight(XSSFCellStyle.BORDER_THIN);
    cellStyle.setBorderTop(XSSFCellStyle.BORDER_THIN);
    return cellStyle;
}

/**
 * 设置表体的单元格样式
 * 
 * @return
 */
public XSSFCellStyle getBodyStyle() {
    // 创建单元格样式
    XSSFCellStyle cellStyle = wb.createCellStyle();
    // 设置单元格居中对齐
    cellStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
    // 设置单元格垂直居中对齐
    cellStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
    // 创建单元格内容显示不下时自动换行
    cellStyle.setWrapText(true);
    // 设置单元格字体样式
    XSSFFont font = wb.createFont();
    // 设置字体加粗
    font.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);
    font.setFontName("宋体");
    font.setFontHeight((short) 200);
    cellStyle.setFont(font);
    // 设置单元格边框为细线条
    cellStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN);
    cellStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN);
    cellStyle.setBorderRight(XSSFCellStyle.BORDER_THIN);
    cellStyle.setBorderTop(XSSFCellStyle.BORDER_THIN);
    return cellStyle;
}
}

2. ExportExcelService 导出Excel文件的业务接口

package com.wangzou.myweb.biz;

import javax.servlet.ServletOutputStream;

public interface ExportExcelService {

public void exportExcel(String hql,String [] titles,
        ServletOutputStream outputStream);  
}

3.ExportExcelServiceImpl 导出Excel文件的业务实现类

package com.wangzou.myweb.biz.impl;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletOutputStream;

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 org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.wangzou.myweb.biz.ExportExcelService;
import com.wangzou.myweb.dao.ExportExcelDao;
import com.wangzou.myweb.entity.Product;
import com.wangzou.myweb.util.ExportUtil;

@Service
@Transactional
public class ExportExcelServiceImpl implements ExportExcelService {
@Autowired
private ExportExcelDao eed;

@Override
public void exportExcel(String hql, String[] titles, ServletOutputStream outputStream) {

    List<Product> list = eed.exportExcel(hql);
    // 创建一个workbook 对应一个excel应用文件
    XSSFWorkbook workBook = new XSSFWorkbook();
    // 在workbook中添加一个sheet,对应Excel文件中的sheet
    XSSFSheet sheet = workBook.createSheet("sheet1");
    ExportUtil exportUtil = new ExportUtil(workBook, sheet);
    XSSFCellStyle headStyle = exportUtil.getHeadStyle();
    XSSFCellStyle bodyStyle = exportUtil.getBodyStyle();
    // 构建表头
    XSSFRow headRow = sheet.createRow(0);
    XSSFCell cell = null;
    for (int i = 0; i < titles.length; i++) {
        cell = headRow.createCell(i);
        cell.setCellStyle(headStyle);
        cell.setCellValue(titles[i]);
    }
    // 构建表体数据
    if (list != null && list.size() > 0) {
        for (int j = 0; j < list.size(); j++) {
            XSSFRow bodyRow = sheet.createRow(j + 1);
            Product product = list.get(j);

            cell = bodyRow.createCell(0);
            cell.setCellStyle(bodyStyle);
            cell.setCellValue(product.getName());

            cell = bodyRow.createCell(1);
            cell.setCellStyle(bodyStyle);
            cell.setCellValue(product.getAmount());

            cell = bodyRow.createCell(2);
            cell.setCellStyle(bodyStyle);
            cell.setCellValue(product.getPrice());
        }
    }
    try {
        workBook.write(outputStream);
        outputStream.flush();
        outputStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}
}

4.ExportExcelDao 导出Excel文件的持久层接口

package com.wangzou.myweb.dao;

 import java.util.List;

 import com.wangzou.myweb.entity.Product;

 public interface ExportExcelDao {
public List<Product> exportExcel(String hql);  
}

5.ExportExcelDaoImpl导出Excel文件的持久层实现类

package com.wangzou.myweb.dao.impl;

import java.util.List;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.wangzou.myweb.dao.ExportExcelDao;
import com.wangzou.myweb.entity.Product;
@Repository
public class ExportExcelDaoImpl implements ExportExcelDao {
@Autowired
private SessionFactory session;
@Override
public List<Product> exportExcel(String hql) {
    @SuppressWarnings("unchecked")
    List<Product> list = session.getCurrentSession().createQuery(hql).list();
    return list;
}

}

6.ExportExcelController导出Excel文件的控制类

package com.wangzou.myweb.controller;

import java.io.IOException;
import java.io.InputStream;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import com.wangzou.myweb.biz.ExportExcelService;

@Controller
public class ExportExcelController {
@Autowired
private ExportExcelService service;

@RequestMapping("/export")
public String exportExcel(HttpServletResponse response) {
    response.setContentType("application/binary;charset=utf-8");
    try {
        ServletOutputStream outputStream = response.getOutputStream();
        String fileName = new String(("product").getBytes(), "utf-8");
        response.setHeader("Content-disposition", "attachment; filename=" + fileName + ".xlsx");// 组装附件名称和格式
        String hql = "from Product";
        String[] titles = { "商品名", "商品总量", "商品单价" };
        service.exportExcel(hql, titles, outputStream);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

@RequestMapping("/load")
public String upload(HttpServletRequest request, HttpServletResponse response) {
    MultipartHttpServletRequest mulRequest = (MultipartHttpServletRequest) request;
    MultipartFile file = mulRequest.getFile("excel");
    String filename = file.getOriginalFilename();
    if (filename == null || "".equals(filename)) {
        return null;
    }
    try {
        InputStream input = file.getInputStream();
        @SuppressWarnings("resource")
        XSSFWorkbook workBook = new XSSFWorkbook(input);
        XSSFSheet sheet = workBook.getSheetAt(0);
        if (sheet != null) {
            for (int i = 1; i < sheet.getPhysicalNumberOfRows(); i++) {
                XSSFRow row = sheet.getRow(i);
                for (int j = 0; j < row.getPhysicalNumberOfCells(); j++) {
                    XSSFCell cell = row.getCell(j);
                    String cellStr = cell.toString();
                    System.out.print("【" + cellStr + "】 ");
                }
                System.out.println();
            }

        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return "/test/uploadExcel.jsp";
}

}

7.Maven依赖的架包

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.14</version>
</dependency>

以上的详细代码就是通过数据库查询到数据并把查询到的数据以Excel表格形式显示出来!