SpringMVC 实现POI读取Excle文件中数据导入数据库（上传）、导出数据库中数据到Excle文件中（下载）

读取Excale表返回一个集合：

package com.shiliu.game.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;

/**
 * SpringMVC 读取Excle工具类
 * @author  otowa
 * @Date    2016-12-04 14:57
 *
 * @param <T>
 */
public class LeadingInExcel<T> {

    //log4j输出
    private Logger logger = Logger.getLogger(this.getClass());
    // 时间的格式
    private String format="yyyy-MM-dd";

    /**
     * 无参构造
     */
    public LeadingInExcel() {
        super();
    }

    /**
     * 构造设置显示时间的格式
     * @param format 例："yyyy-MM-dd"
     */
    public LeadingInExcel(String format) {
        super();
        this.format = format;
    }

    /**
     * 设置显示时间的格式
     * @param format 例："yyyy-MM-dd"
     */
    public void setFormat(String format) {
        this.format = format;
    }

    /**
     * 上传Excle文件、并读取其中数据、返回list数据集合
     * @param multipart
     * @param propertiesFileName    properties文件名称
     * @param kyeName                properties文件中上传存储文件的路径
     * @param sheetIndex            读取Excle中的第几页中的数据
     * @param titleAndAttribute        标题名与实体类属性名对应的Map集合
     * @param clazz                    实体类.class
     * @return                        返回读取出的List集合
     * @throws Exception
     */
    public List<T> uploadAndRead(MultipartFile multipart,String propertiesFileName, String kyeName,int sheetIndex,
            Map<String, String> titleAndAttribute,Class<T> clazz) throws Exception{

            String originalFilename=null;
            int i = 0;
            boolean isExcel2003 = false;

            //取出文件名称
            originalFilename = multipart.getOriginalFilename();

            //判断Excel是什么版本
            i = isExcleVersion(originalFilename);
            if(i==0)return null; else if(i==1)isExcel2003=true;

            String filePath = readPropertiesFilePathMethod( propertiesFileName, kyeName);
            File filePathname = this.upload(multipart, filePath, isExcel2003);
            List<T> judgementVersion = judgementVersion(filePathname, sheetIndex, titleAndAttribute, clazz, isExcel2003);

        return judgementVersion;
    }

    /**
     * @描述：判断Excel是什么版本
     * @param originalFilename
     * @return
     *         1 ：2003
     *         2 ：2007
     *         0 ：不是Excle版本
     */
    public int isExcleVersion(String originalFilename){
        int i = 0;

        if(originalFilename.matches("^.+\\.(?i)(xls)$"))i = 1;
        else
        if(originalFilename.matches("^.+\\.(?i)(xlsx)$"))i = 2;

        return i;
    }

    /**
     * 读取properties文件中对应键的值
     * @param propertiesFileName
     * @param kyeName
     * @return value值
     */
    public String readPropertiesFilePathMethod(String propertiesFileName, String kyeName){

        //读取properties文件
        InputStream inputStream=null;
        Properties properties=null;
        String filePath=null;//读取出的文件路径
        try {
          inputStream= new FileInputStream(this.getClass().getClassLoader().getResource("/"+propertiesFileName+".properties").getPath());
          properties=new Properties();
          properties.load(inputStream);
          filePath = properties.getProperty(kyeName);
        } catch (FileNotFoundException e1) {
            logger.error("未找到properties文件！", e1);
        } catch (IOException e1) {
            logger.error("打开文件流异常！", e1);
        } finally{
            //关闭流
            if(inputStream!=null){
                try {
                    inputStream.close();
                } catch (IOException e) {
                    logger.error("关闭文件流异常！", e);
                }
            }
        }
        return filePath;
    }

    /**
     * SpringMVC 上传Excle文件至本地
     * @param multipart
     * @param filePath        上传至本地的文件路径    例：D:\\fileupload
     * @param isExcel2003    是否是2003版本的Excle文件
     * @return                返回上传文件的全路径
     * @throws Exception
     */
    public File upload(MultipartFile multipart,String filePath,boolean isExcel2003) throws Exception{
        //文件后缀
        String extension=".xlsx";
        if(isExcel2003)extension=".xls";
        //指定上传文件的存储路径
        File file=new File(filePath);

        //接口强转实现类
        CommonsMultipartFile commons=(CommonsMultipartFile) multipart;

        //判断所属路径是否存在、不存在新建
        if(file.exists())file.mkdirs();

        /*
         * 新建一个文件
         * LongIdWorker longID工具类
         */
        File filePathname=new File(file+File.separator+LongIdWorker.getDataId()+extension);

        //将上传的Excel写入新建的文件中
        try {
            commons.getFileItem().write(filePathname);
        } catch (Exception e) {
            logger.error("写入文件异常", e);
        }

        return filePathname;
    }

    /**
     * 读取本地Excel文件返回List集合
     * @param filePathname
     * @param sheetIndex
     * @param titleAndAttribute
     * @param clazz
     * @param isExcel2003
     * @return
     * @throws Exception
     */
    public List<T> judgementVersion(File filePathname,int sheetIndex,Map<String, String> titleAndAttribute,Class<T> clazz,boolean isExcel2003) throws Exception{

        FileInputStream is=null;
        POIFSFileSystem fs=null;
        Workbook workbook=null;
            try {
                //打开流
                is=new FileInputStream(filePathname);
                if(isExcel2003){
                    //把excel文件作为数据流来进行传入传出
                    fs=new POIFSFileSystem(is);
                    //解析Excel 2003版
                    workbook = new HSSFWorkbook(fs);
                }else{
                    //解析Excel 2007版
                    workbook=new XSSFWorkbook(is);
                }

            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        return readExcelTitle(workbook,sheetIndex,titleAndAttribute,clazz);
    }

    /**
     * 判断接收的Map集合中的标题是否于Excle中标题对应
     * @param workbook
     * @param sheetIndex
     * @param titleAndAttribute
     * @param clazz
     * @return
     * @throws Exception
     */
    private List<T> readExcelTitle(Workbook workbook,int sheetIndex,Map<String, String> titleAndAttribute,Class<T> clazz) throws Exception{

        //得到第一个shell
        Sheet sheet = workbook.getSheetAt(sheetIndex);

        // 获取标题
        Row titelRow = sheet.getRow(0);
        Map<Integer, String> attribute = new HashMap<Integer, String>();
        if (titleAndAttribute != null) {
            for (int columnIndex = 0; columnIndex < titelRow.getLastCellNum(); columnIndex++) {
                Cell cell = titelRow.getCell(columnIndex);
                if (cell != null) {
                    String key = cell.getStringCellValue();
                    String value = titleAndAttribute.get(key);
                    if (value == null) {
                        value = key;
                    }
                    attribute.put(Integer.valueOf(columnIndex), value);
                }
            }
        } else {
            for (int columnIndex = 0; columnIndex < titelRow.getLastCellNum(); columnIndex++) {
                Cell cell = titelRow.getCell(columnIndex);
                if (cell != null) {
                    String key = cell.getStringCellValue();
                    attribute.put(Integer.valueOf(columnIndex), key);
                }
            }
        }

        return readExcelValue(workbook,sheet,attribute,clazz);

    }

    /**
     * 获取Excle中的值
     * @param workbook
     * @param sheet
     * @param attribute
     * @param clazz
     * @return
     * @throws Exception
     */
    private List<T> readExcelValue(Workbook workbook,Sheet sheet,Map<Integer, String> attribute,Class<T> clazz) throws Exception{
        List<T> info=new ArrayList<T>();
        //获取标题行列数
        int titleCellNum = sheet.getRow(0).getLastCellNum();
        // 获取值
        for (int rowIndex = 1; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
            Row row = sheet.getRow(rowIndex);
//            logger.debug("第--" + rowIndex);

            //    1.若当前行的列数不等于标题行列数就放弃整行数据(若想放弃此功能注释4个步骤即可)
            int lastCellNum = row.getLastCellNum();
            if(titleCellNum !=  lastCellNum){
                continue;
            }

            // 2.标记
            boolean judge = true;
            T obj = clazz.newInstance();
            for (int columnIndex = 0; columnIndex < row.getLastCellNum(); columnIndex++) {//这里小于等于变成小于
                Cell cell = row.getCell(columnIndex);

                //处理单元格中值得类型
                String value = getCellValue(cell);

                // 3.单元格中的值等于null或等于"" 就放弃整行数据
                if(value == null || "".equals(value)){
                    judge = false;
                    break;
                }

                /*
                 * 测试：查看自定义的title Map集合中定义的Excle标题和实体类中属性对应情况！
                   System.out.println("c:"+columnIndex+"\t"+attribute.get(Integer.valueOf(columnIndex)));
                 */
                Field field = clazz.getDeclaredField(attribute.get(Integer
                        .valueOf(columnIndex)));
                Class<?> fieldType = field.getType();
                Object agge = null;
                if (fieldType.isAssignableFrom(Integer.class)) {
                    agge = Integer.valueOf(value);
                } else if (fieldType.isAssignableFrom(Double.class)) {
                    agge = Double.valueOf(value);
                } else if (fieldType.isAssignableFrom(Float.class)) {
                    agge = Float.valueOf(value);
                } else if (fieldType.isAssignableFrom(Long.class)) {
                    agge = Long.valueOf(value);
                } else if (fieldType.isAssignableFrom(Date.class)) {
                    agge = new SimpleDateFormat(format).parse(value);
                } else if (fieldType.isAssignableFrom(Boolean.class)) {
                    agge = "Y".equals(value) || "1".equals(value);
                } else if (fieldType.isAssignableFrom(String.class)) {
                    agge = value;
                }
                // 个人感觉char跟byte就不用判断了 用这两个类型的很少如果是从数据库用IDE生成的话就不会出现了
                Method method = clazz.getMethod("set"
                        + toUpperFirstCase(attribute.get(Integer
                                .valueOf(columnIndex))), fieldType);
                method.invoke(obj, agge);

            }
            // 4. if
            if(judge)info.add(obj);
        }
        return info;
    }

    /**
     *  @ 首字母大写
     */
    private String toUpperFirstCase(String str) {
        return str.replaceFirst(str.substring(0, 1), str.substring(0, 1)
                .toUpperCase());
    }

    /**
     * 功能:处理单元格中值得类型
     * @param cell
     * @return
     */
    private String getCellValue(Cell cell) {
        Object result = "";
        if (cell != null) {
            switch (cell.getCellType()) {
            case Cell.CELL_TYPE_STRING:
                result = cell.getStringCellValue();
                break;
            case Cell.CELL_TYPE_NUMERIC:
                //判断是是日期型，转换日期格式，否则转换数字格式。
                if(DateUtil.isCellDateFormatted(cell)){
                    Date dateCellValue = cell.getDateCellValue();
                    if(dateCellValue != null){
                        result = new SimpleDateFormat(this.format).format(dateCellValue);
                    }else{
                        result="";
                    }
                }else{
                    result = new DecimalFormat("0").format(cell.getNumericCellValue());
                };
                break;
            case Cell.CELL_TYPE_BOOLEAN:
                result = cell.getBooleanCellValue();
                break;
            case Cell.CELL_TYPE_FORMULA:
                /*
                 *  导入时如果为公式生成的数据则无值
                 *
                    if (!cell.getStringCellValue().equals("")) {
                        value = cell.getStringCellValue();
                    } else {
                        value = cell.getNumericCellValue() + "";
                    }
                */
                result = cell.getCellFormula();
                break;
            case Cell.CELL_TYPE_ERROR:
                result = cell.getErrorCellValue();
                break;
            case Cell.CELL_TYPE_BLANK:
                break;
            default:
                break;
            }
        }
        return result.toString();
    }
}

使用例子（项目代码只能模仿）：

    /**
     * 读取Excel中的用户信息插入数据库
     * @param multipart
     * @param session
     * @return
     */
    @RequestMapping(value="/batchimport")
    @ResponseBody
    public String batchImportMethod(
            @RequestParam(value="gameId") String gameId,
            @RequestParam(value="filename") MultipartFile multipart
    ){
        //局部变量
        LeadingInExcel<UserWhiteList> testExcel=null;
        List<UserWhiteList> uploadAndRead=null;
        boolean judgement = false;
        String Msg =null;
        String error = "";

        //定义需要读取的数据
        String formart = "yyyy-MM-dd";
        String propertiesFileName = "config";
        String kyeName = "file_path";
        int sheetIndex = 0;
        Map<String, String> titleAndAttribute=null;
        Class<UserWhiteList> clazz=UserWhiteList.class;
            //定义对应的标题名与对应属性名
            titleAndAttribute=new HashMap<String, String>();
            titleAndAttribute.put("手机号码", "phone");
            titleAndAttribute.put("总抽奖次数", "playtimes");

        //调用解析工具包
        testExcel=new LeadingInExcel<UserWhiteList>(formart);
        //解析excel，获取客户信息集合
        try {
            uploadAndRead = testExcel.uploadAndRead(multipart, propertiesFileName, kyeName, sheetIndex, titleAndAttribute, clazz);
        } catch (Exception e) {
            log.error("读取Excel文件错误！",e);
        }
        if(uploadAndRead != null && !"[]".equals(uploadAndRead.toString()) && uploadAndRead.size()>=1){
            judgement = true;
        }
        if(judgement){

            //把客户信息分为没100条数据为一组迭代添加客户信息（注：将customerList集合作为参数，在Mybatis的相应映射文件中使用foreach标签进行批量添加。）
            //int count=0;
            int listSize=uploadAndRead.size();
            int toIndex=100;
            for (int i = 0; i < listSize; i+=100) {
                if(i+100>listSize){
                    toIndex=listSize-i;
                }
                List<UserWhiteList> subList = uploadAndRead.subList(i, i+toIndex);
                /*
                 * 测试数据：
                     count=count+subList.size();
                    System.out.println("subList长度："+subList.size()+"\t总长度："+count);
                 *
                     for (UserJHDX userJHDX : subList) {
                        System.out.println("手机号："+userJHDX.getPhone()+"截止日期:"+userJHDX.getUptodate()+"流量值"+userJHDX.getFlux()+"总次数"+userJHDX.getTotal());
                    }
                 */

                /** 此处执行集合添加 */
                userWhiteListService.batchInport(subList, gameId);
            }

             Msg ="批量导入EXCEL成功！";
        }else{
             Msg ="批量导入EXCEL失败！";
        }

        String res = "{ error:'" + error + "', msg:'" + Msg + "'}";
        return res;
    }

读取一个集合输出Excle:

package com.shiliu.game.utils;

import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;  

import javax.servlet.http.HttpServletResponse;  

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;  

/**
 * 导出Excel公共方法
 *
 * @author wkr
 *
 */
public class LeadingOutExcel {  

    //导出文件的名字
    private String fileName;
    //显示的导出表的标题
    private String title;
    //导出表的列名
    private String[] rowName;

    private List<Object[]>  dataList = new ArrayList<Object[]>();  

    private HttpServletResponse  response = null;

    private HSSFWorkbook workbook = null;

    private OutputStream out = null;

    //构造方法，传入要导出的数据
    public LeadingOutExcel(String fileName,String title,String[] rowName,List<Object[]>  dataList,HttpServletResponse response){
        this.fileName = fileName;
        this.dataList = dataList;
        this.rowName = rowName;
        this.title = title;
        this.response = response;
    }

    public void export () throws Exception{

        HSSFWorkbook createExcel = this.createExcel();
        this.writeInOutputStream(createExcel);
    }

    /*
     * 导出数据
     * */
    public HSSFWorkbook createExcel() throws Exception{
        try{
            workbook = new HSSFWorkbook();                     // 创建工作簿对象
            HSSFSheet sheet = workbook.createSheet(title);                  // 创建工作表  

            /*
             *  产生表格标题行
            HSSFRow rowm = sheet.createRow(0);
            HSSFCell cellTiltle = rowm.createCell(0);//设置开头两行

                 * 使用条件：
                 * HSSFRow rowRowName = sheet.createRow(0);设置索引2的位置创建行
                 * HSSFRow row = sheet.createRow(i+1);//创建所需的行数     改为i+3
                 *
             */

            //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
            HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
            HSSFCellStyle style = this.getStyle(workbook);                  //单元格样式对象  

            /*
             *  产生表格标题行
            sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1))); //设置开头两行合并
            cellTiltle.setCellStyle(columnTopStyle);  //设置列头单元格样式
            cellTiltle.setCellValue("");//设置空单元格的内容。比如传入List的值是空的。
             */
            // 定义所需列数
            int columnNum = rowName.length;
            HSSFRow rowRowName = sheet.createRow(0);                // 在索引2的位置创建行(最顶端的行开始的第二行)  

            // 将列头设置到sheet的单元格中
            for(int n=0;n<columnNum;n++){
                HSSFCell  cellRowName = rowRowName.createCell(n);               //创建列头对应个数的单元格
                cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);             //设置列头单元格的数据类型
                HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                cellRowName.setCellValue(text);                                 //设置列头单元格的值
                cellRowName.setCellStyle(columnTopStyle);                       //设置列头单元格样式
            }  

            //将查询出的数据设置到sheet对应的单元格中
            for(int i=0;i<dataList.size();i++){  

                Object[] obj = dataList.get(i);//遍历每个对象
                HSSFRow row = sheet.createRow(i+1);//创建所需的行数  

                for(int j=0; j<obj.length; j++){
                    HSSFCell  cell = null;   //设置单元格的数据类型
                    if(j == 0){
                        cell = row.createCell(j,HSSFCell.CELL_TYPE_NUMERIC);
                        cell.setCellValue(i+1);
                    }else{
                        cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING);
                        if(!"".equals(obj[j]) && obj[j] != null){
                            cell.setCellValue(obj[j].toString());               //设置单元格的值
                        }
                    }
                    cell.setCellStyle(style);                                   //设置单元格样式
                }
            }
            //让列宽随着导出的列长自动适应
            for (int colNum = 0; colNum < columnNum; colNum++) {
                int columnWidth = sheet.getColumnWidth(colNum) / 256;
                for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                    HSSFRow currentRow;
                    //当前行未被使用过
                    if (sheet.getRow(rowNum) == null) {
                        currentRow = sheet.createRow(rowNum);
                    } else {
                        currentRow = sheet.getRow(rowNum);
                    }
                    if (currentRow.getCell(colNum) != null) {
                        HSSFCell currentCell = currentRow.getCell(colNum);
                        if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                            //int length = currentCell.getStringCellValue().getBytes().length;
                            String stringCellValue = null;
                            try {
                                stringCellValue = currentCell.getStringCellValue();
                            } catch (Exception e) {
                                continue;
                            }
                            int length = stringCellValue==null?50:stringCellValue.getBytes().length;  

                            if (columnWidth < length) {
                                columnWidth = length;
                            }
                        }
                    }
                }
                if(colNum == 0){
                    sheet.setColumnWidth(colNum, (columnWidth-2) * 256);
                }else{
                    sheet.setColumnWidth(colNum, (columnWidth+4) * 256);
                }
            }  

        }catch(Exception e){
            e.printStackTrace();
        }
        return workbook;  

    }

    public void writeInOutputStream(HSSFWorkbook workbook) throws Exception{

        //设置响应类型、与头信息
        response.setContentType("application/x-msdownload");
        response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fileName+".xls", "UTF-8"));
        out = response.getOutputStream();
        workbook.write(out);

          //清除资源
        out.close();
    }

    /*
     * 列头单元格样式
     */
    public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {  

          // 设置字体
          HSSFFont font = workbook.createFont();
          //设置字体大小
          font.setFontHeightInPoints((short)11);
          //字体加粗
          font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
          //设置字体名字
          font.setFontName("Courier New");
          //设置样式;
          HSSFCellStyle style = workbook.createCellStyle();
          //设置底边框;
          style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
          //设置底边框颜色;
          style.setBottomBorderColor(HSSFColor.BLACK.index);
          //设置左边框;
          style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
          //设置左边框颜色;
          style.setLeftBorderColor(HSSFColor.BLACK.index);
          //设置右边框;
          style.setBorderRight(HSSFCellStyle.BORDER_THIN);
          //设置右边框颜色;
          style.setRightBorderColor(HSSFColor.BLACK.index);
          //设置顶边框;
          style.setBorderTop(HSSFCellStyle.BORDER_THIN);
          //设置顶边框颜色;
          style.setTopBorderColor(HSSFColor.BLACK.index);
          //在样式用应用设置的字体;
          style.setFont(font);
          //设置自动换行;
          style.setWrapText(false);
          //设置水平对齐的样式为居中对齐;
          style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
          //设置垂直对齐的样式为居中对齐;
          style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);  

          return style;  

    }  

    /*
     * 列数据信息单元格样式
     */
    public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
          // 设置字体
          HSSFFont font = workbook.createFont();
          //设置字体大小
          //font.setFontHeightInPoints((short)10);
          //字体加粗
          //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
          //设置字体名字
          font.setFontName("Courier New");
          //设置样式;
          HSSFCellStyle style = workbook.createCellStyle();
          //设置底边框;
          style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
          //设置底边框颜色;
          style.setBottomBorderColor(HSSFColor.BLACK.index);
          //设置左边框;
          style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
          //设置左边框颜色;
          style.setLeftBorderColor(HSSFColor.BLACK.index);
          //设置右边框;
          style.setBorderRight(HSSFCellStyle.BORDER_THIN);
          //设置右边框颜色;
          style.setRightBorderColor(HSSFColor.BLACK.index);
          //设置顶边框;
          style.setBorderTop(HSSFCellStyle.BORDER_THIN);
          //设置顶边框颜色;
          style.setTopBorderColor(HSSFColor.BLACK.index);
          //在样式用应用设置的字体;
          style.setFont(font);
          //设置自动换行;
          style.setWrapText(false);
          //设置水平对齐的样式为居中对齐;
          style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
          //设置垂直对齐的样式为居中对齐;
          style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);  

          return style;  

    }
}
package com.shiliu.game.utils;

import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;  

import javax.servlet.http.HttpServletResponse;  

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;  

/**
 * 导出Excel公共方法
 *
 * @author wkr
 *
 */
public class LeadingOutExcel {  

    //导出文件的名字
    private String fileName;
    //显示的导出表的标题
    private String title;
    //导出表的列名
    private String[] rowName;

    private List<Object[]>  dataList = new ArrayList<Object[]>();  

    private HttpServletResponse  response = null;

    private HSSFWorkbook workbook = null;

    private OutputStream out = null;

    //构造方法，传入要导出的数据
    public LeadingOutExcel(String fileName,String title,String[] rowName,List<Object[]>  dataList,HttpServletResponse response){
        this.fileName = fileName;
        this.dataList = dataList;
        this.rowName = rowName;
        this.title = title;
        this.response = response;
    }

    public void export () throws Exception{

        HSSFWorkbook createExcel = this.createExcel();
        this.writeInOutputStream(createExcel);
    }

    /*
     * 导出数据
     * */
    public HSSFWorkbook createExcel() throws Exception{
        try{
            workbook = new HSSFWorkbook();                     // 创建工作簿对象
            HSSFSheet sheet = workbook.createSheet(title);                  // 创建工作表  

            /*
             *  产生表格标题行
            HSSFRow rowm = sheet.createRow(0);
            HSSFCell cellTiltle = rowm.createCell(0);//设置开头两行

                 * 使用条件：
                 * HSSFRow rowRowName = sheet.createRow(0);设置索引2的位置创建行
                 * HSSFRow row = sheet.createRow(i+1);//创建所需的行数     改为i+3
                 *
             */

            //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
            HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
            HSSFCellStyle style = this.getStyle(workbook);                  //单元格样式对象  

            /*
             *  产生表格标题行
            sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1))); //设置开头两行合并
            cellTiltle.setCellStyle(columnTopStyle);  //设置列头单元格样式
            cellTiltle.setCellValue("");//设置空单元格的内容。比如传入List的值是空的。
             */
            // 定义所需列数
            int columnNum = rowName.length;
            HSSFRow rowRowName = sheet.createRow(0);                // 在索引2的位置创建行(最顶端的行开始的第二行)  

            // 将列头设置到sheet的单元格中
            for(int n=0;n<columnNum;n++){
                HSSFCell  cellRowName = rowRowName.createCell(n);               //创建列头对应个数的单元格
                cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);             //设置列头单元格的数据类型
                HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                cellRowName.setCellValue(text);                                 //设置列头单元格的值
                cellRowName.setCellStyle(columnTopStyle);                       //设置列头单元格样式
            }  

            //将查询出的数据设置到sheet对应的单元格中
            for(int i=0;i<dataList.size();i++){  

                Object[] obj = dataList.get(i);//遍历每个对象
                HSSFRow row = sheet.createRow(i+1);//创建所需的行数  

                for(int j=0; j<obj.length; j++){
                    HSSFCell  cell = null;   //设置单元格的数据类型
                    if(j == 0){
                        cell = row.createCell(j,HSSFCell.CELL_TYPE_NUMERIC);
                        cell.setCellValue(i+1);
                    }else{
                        cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING);
                        if(!"".equals(obj[j]) && obj[j] != null){
                            cell.setCellValue(obj[j].toString());               //设置单元格的值
                        }
                    }
                    cell.setCellStyle(style);                                   //设置单元格样式
                }
            }
            //让列宽随着导出的列长自动适应
            for (int colNum = 0; colNum < columnNum; colNum++) {
                int columnWidth = sheet.getColumnWidth(colNum) / 256;
                for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                    HSSFRow currentRow;
                    //当前行未被使用过
                    if (sheet.getRow(rowNum) == null) {
                        currentRow = sheet.createRow(rowNum);
                    } else {
                        currentRow = sheet.getRow(rowNum);
                    }
                    if (currentRow.getCell(colNum) != null) {
                        HSSFCell currentCell = currentRow.getCell(colNum);
                        if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                            //int length = currentCell.getStringCellValue().getBytes().length;
                            String stringCellValue = null;
                            try {
                                stringCellValue = currentCell.getStringCellValue();
                            } catch (Exception e) {
                                continue;
                            }
                            int length = stringCellValue==null?50:stringCellValue.getBytes().length;  

                            if (columnWidth < length) {
                                columnWidth = length;
                            }
                        }
                    }
                }
                if(colNum == 0){
                    sheet.setColumnWidth(colNum, (columnWidth-2) * 256);
                }else{
                    sheet.setColumnWidth(colNum, (columnWidth+4) * 256);
                }
            }  

        }catch(Exception e){
            e.printStackTrace();
        }
        return workbook;  

    }

    public void writeInOutputStream(HSSFWorkbook workbook) throws Exception{

        //设置响应类型、与头信息
        response.setContentType("application/x-msdownload");
        response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fileName+".xls", "UTF-8"));
        out = response.getOutputStream();
        workbook.write(out);

          //清除资源
        out.close();
    }

    /*
     * 列头单元格样式
     */
    public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {  

          // 设置字体
          HSSFFont font = workbook.createFont();
          //设置字体大小
          font.setFontHeightInPoints((short)11);
          //字体加粗
          font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
          //设置字体名字
          font.setFontName("Courier New");
          //设置样式;
          HSSFCellStyle style = workbook.createCellStyle();
          //设置底边框;
          style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
          //设置底边框颜色;
          style.setBottomBorderColor(HSSFColor.BLACK.index);
          //设置左边框;
          style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
          //设置左边框颜色;
          style.setLeftBorderColor(HSSFColor.BLACK.index);
          //设置右边框;
          style.setBorderRight(HSSFCellStyle.BORDER_THIN);
          //设置右边框颜色;
          style.setRightBorderColor(HSSFColor.BLACK.index);
          //设置顶边框;
          style.setBorderTop(HSSFCellStyle.BORDER_THIN);
          //设置顶边框颜色;
          style.setTopBorderColor(HSSFColor.BLACK.index);
          //在样式用应用设置的字体;
          style.setFont(font);
          //设置自动换行;
          style.setWrapText(false);
          //设置水平对齐的样式为居中对齐;
          style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
          //设置垂直对齐的样式为居中对齐;
          style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);  

          return style;  

    }  

    /*
     * 列数据信息单元格样式
     */
    public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
          // 设置字体
          HSSFFont font = workbook.createFont();
          //设置字体大小
          //font.setFontHeightInPoints((short)10);
          //字体加粗
          //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
          //设置字体名字
          font.setFontName("Courier New");
          //设置样式;
          HSSFCellStyle style = workbook.createCellStyle();
          //设置底边框;
          style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
          //设置底边框颜色;
          style.setBottomBorderColor(HSSFColor.BLACK.index);
          //设置左边框;
          style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
          //设置左边框颜色;
          style.setLeftBorderColor(HSSFColor.BLACK.index);
          //设置右边框;
          style.setBorderRight(HSSFCellStyle.BORDER_THIN);
          //设置右边框颜色;
          style.setRightBorderColor(HSSFColor.BLACK.index);
          //设置顶边框;
          style.setBorderTop(HSSFCellStyle.BORDER_THIN);
          //设置顶边框颜色;
          style.setTopBorderColor(HSSFColor.BLACK.index);
          //在样式用应用设置的字体;
          style.setFont(font);
          //设置自动换行;
          style.setWrapText(false);
          //设置水平对齐的样式为居中对齐;
          style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
          //设置垂直对齐的样式为居中对齐;
          style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);  

          return style;  

    }
}  

使用例子（项目代码只能模仿）：

    /**
     * 条件导出
     * @param gameId
     * @param startDate
     * @param endDate
     * @param level
     * @param response
     */
    @RequestMapping(value="/conditionalExportDate")
    public void conditionalExportDateMethod(
        @RequestParam(value="gameId") String gameId,
        @RequestParam(value="startDate") String startDate,
        @RequestParam(value="endDate") String endDate,
        @RequestParam(value="level") String level,
        HttpServletResponse response
    ){
        Map<String, Object> conditionMap = null;
        List<PlayRecord> dataSet = null;
        LeadingOutExcel leadingOutExcel = null;    //工具类

        //配置信息
        String fileName = "client";
        String format = "yyyy-MM-dd hh:mm:ss";
        String title = "用户信息";
        String[] rowName = { "编号","微信号","微信名称", "手机号", "参与活动时间","中奖等级", "获得奖品" };

        //查询条件
        conditionMap = new HashMap<String, Object>();
        conditionMap.put("gameId", gameId);
        //导出全部
        if(!"请选择日期".equals(startDate) && !"请选择日期".equals(endDate)){
            conditionMap.put("startDate", startDate);
            conditionMap.put("endDate", endDate);
        }
        if(!"请输入中奖等级".equals(level)){
            conditionMap.put("level", level);
        }

        dataSet = playRecordService.conditionQuery(conditionMap);

        List<Object[]>  dataList = new ArrayList<Object[]>();
        Object[] objs = null;
        for (int i = 0; i < dataSet.size(); i++) {
            PlayRecord man = dataSet.get(i);
            objs = new Object[rowName.length];
            objs[0] = i;
            objs[1] = man.getOpenid();
            objs[2] = man.getNickName();
            objs[3] = man.getPhoneNumber();
                //日期类型处理
                Date date = man.getPalyTime();
                String dateStr = "";
                if(date!=null){
                    SimpleDateFormat df = new SimpleDateFormat(format);
                    dateStr = df.format(date);
                }
            objs[4] = dateStr;
            objs[5] = man.getLevel();
            objs[6] = man.getAwardName();
            dataList.add(objs);
        }  

        leadingOutExcel = new LeadingOutExcel(fileName,title, rowName, dataList,response);
        try {
            leadingOutExcel.export();
        } catch (Exception e) {
            log.error("写入Excle出错！", e);
        }
    }
}

原创：意艺