java SpringMVC中 POI读取数据库数据并写入Excel表格中，并实现下载功能

package cn.itcast.jk.controller.cargo.outproduct;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.CellRangeAddress;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
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.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import cn.itcast.jk.controller.BaseController;
import cn.itcast.jk.service.OutProductService;
import cn.itcast.jk.vo.OutProductVO;
import cn.itcast.util.DownloadUtil;

/**
* @Description:
* @Author: nutony
* @Company:    http://java.itcast.cn * @CreateDate: 2014年10月14日
*/
@Controller
public class OutProductController extends BaseController {
@Resource
OutProductService outProductService;

//转向编辑页面
@RequestMapping("/cargo/outproduct/toedit.action")
public String toedit(){
return "/cargo/outproduct/jOutProduct.jsp";
}

@RequestMapping("/cargo/outproduct/printNotemplate.action")
public void printNotemplate(String inputDate) throws IOException{

/*
* POI实现excel打印
* 1、大标题，合并单元格
* 2、标题，修饰
* 3、内容，修饰
*
*/

Workbook wb = new HSSFWorkbook();       //创建一个工作簿
Sheet sheet = wb.createSheet();         //创建一个工作表
Row nRow = null;
Cell nCell = null;
int rowNo = 0;                          //行号
int colNo = 1;                          //列号

//创建样式和字体对象
CellStyle curStyle = wb.createCellStyle();
Font curFont = wb.createFont();

sheet.setColumnWidth(0, 1*278);             //设置列宽 256，BUG，精度不够，总是差一点
sheet.setColumnWidth(1, 26*278);

//处理大标题 sheet.addMergedRegion(new CellRangeAddress(开始行，结束行，开始列，结束列));
sheet.addMergedRegion(new CellRangeAddress(0, 0, 1, 8));        //合并单元格
nRow = sheet.createRow(rowNo++);
nRow.setHeightInPoints(36);

nCell = nRow.createCell(1);
nCell.setCellStyle(bigTitleStyle(wb));

nCell.setCellValue(inputDate.replaceFirst("-0", "-").replaceFirst("-", "年") + "月份出货表");
1656f
//yyyy-MM

//处理标题
String[] title = new String[]{"客户","订单号","货号","数量","工厂","工厂交期","船期","贸易条款"};    //标题数组
nRow = sheet.createRow(rowNo++);
nRow.setHeightInPoints(26);

for(int i=0;i<title.length;i++){
nCell = nRow.createCell(i+1);
nCell.setCellValue(title[i]);
nCell.setCellStyle(this.titleStyle(wb));
}

//处理内容
List<OutProductVO> dataList = outProductService.find(inputDate);
for(int j=0;j<dataList.size();j++){
colNo = 1;              //初始化
OutProductVO op = dataList.get(j);

nRow = sheet.createRow(rowNo++);
nRow.setHeightInPoints(24);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getCustomName());
nCell.setCellStyle(this.textStyle(wb, curStyle, curFont));

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getContractNo());
nCell.setCellStyle(this.textStyle(wb, curStyle, curFont));

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getProductNo());
nCell.setCellStyle(this.textStyle(wb, curStyle, curFont));

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getCnumber());
nCell.setCellStyle(this.textStyle(wb, curStyle, curFont));

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getFactoryName());
nCell.setCellStyle(this.textStyle(wb, curStyle, curFont));

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getDeliveryPeriod());
nCell.setCellStyle(this.textStyle(wb, curStyle, curFont));

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getShipTime());
nCell.setCellStyle(this.textStyle(wb, curStyle, curFont));

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getTradeTerms());
nCell.setCellStyle(this.textStyle(wb, curStyle, curFont));
}

OutputStream os = new FileOutputStream("c:\\outproduct.xls");
wb.write(os);

os.flush();
os.close();
}

//模板开发
@RequestMapping("/cargo/outproduct/printHSSF.action")
public void printHSSF(String inputDate, HttpServletRequest request, HttpServletResponse response) throws IOException{
//linux下jdk1.8 方法获取时，不会拼接自己写的目录
String path = request.getSession().getServletContext().getRealPath("/") + "/make/xlsprint/";
InputStream is = new FileInputStream(new File(path + "tOUTPRODUCT.xls"));

Workbook wb = new HSSFWorkbook(is);     //打开一个模板文件，工作簿
Sheet sheet = wb.getSheetAt(0);         //获取到第一个工作表

Row nRow = null;
Cell nCell = null;
int rowNo = 0;                          //行号
int colNo = 1;                          //列号

//获取模板上的单元格样式
nRow = sheet.getRow(2);

//客户的样式
nCell = nRow.getCell(1);
CellStyle customStyle = nCell.getCellStyle();

//订单号的样式
nCell = nRow.getCell(2);
CellStyle contractNoStyle = nCell.getCellStyle();

//货号的样式
nCell = nRow.getCell(3);
CellStyle productNoStyle = nCell.getCellStyle();

//数量的样式
nCell = nRow.getCell(4);
CellStyle numStyle = nCell.getCellStyle();

//生产厂家的样式
nCell = nRow.getCell(5);
CellStyle factoryStyle = nCell.getCellStyle();

//日期的样式
nCell = nRow.getCell(6);
CellStyle dateStyle = nCell.getCellStyle();

//贸易条款的样式
nCell = nRow.getCell(8);
CellStyle tradeStyle = nCell.getCellStyle();

//处理大标题
nRow = sheet.getRow(rowNo++);           //获取一个行对象
nCell = nRow.getCell(colNo);            //获取一个单元格对象
nCell.setCellValue(inputDate.replaceFirst("-0", "-").replaceFirst("-", "年") + "月份出货表");     //yyyy-MM

rowNo++;                                //跳过静态表格头

//处理内容
List<OutProductVO> dataList = outProductService.find(inputDate);
for(int j=0;j<dataList.size();j++){
colNo = 1;              //初始化
OutProductVO op = dataList.get(j);

nRow = sheet.createRow(rowNo++);
nRow.setHeightInPoints(24);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getCustomName());
nCell.setCellStyle(customStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getContractNo());
nCell.setCellStyle(contractNoStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getProductNo());
nCell.setCellStyle(productNoStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getCnumber());
nCell.setCellStyle(numStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getFactoryName());
nCell.setCellStyle(factoryStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getDeliveryPeriod());
nCell.setCellStyle(dateStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getShipTime());
nCell.setCellStyle(dateStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getTradeTerms());
nCell.setCellStyle(tradeStyle);
}

//      OutputStream os = new FileOutputStream("c:\\outproduct.xls");
//      wb.write(os);
//
//      os.flush();
//      os.close();

ByteArrayOutputStream os = new ByteArrayOutputStream();
wb.write(os);

DownloadUtil downloadUtil = new DownloadUtil();             //直接弹出下载框，用户可以打开，可以保存
downloadUtil.download(os, response, "出货表.xls");

os.flush();
os.close();
}

//模板开发XSSF
@RequestMapping("/cargo/outproduct/print.action")
public void print(String inputDate, HttpServletRequest request, HttpServletResponse response) throws IOException{
//linux下jdk1.8 方法获取时，不会拼接自己写的目录
String path = request.getSession().getServletContext().getRealPath("/") + "/make/xlsprint/";
InputStream is = new FileInputStream(new File(path + "tOUTPRODUCT.xlsx"));

Workbook wb = new XSSFWorkbook(is);     //打开一个模板文件，工作簿 2007以上版本
Sheet sheet = wb.getSheetAt(0);         //获取到第一个工作表

Row nRow = null;
Cell nCell = null;
int rowNo = 0;                          //行号
int colNo = 1;                          //列号

//获取模板上的单元格样式
nRow = sheet.getRow(2);

//客户的样式
nCell = nRow.getCell(1);
CellStyle customStyle = nCell.getCellStyle();

//订单号的样式
nCell = nRow.getCell(2);
CellStyle contractNoStyle = nCell.getCellStyle();

//货号的样式
nCell = nRow.getCell(3);
CellStyle productNoStyle = nCell.getCellStyle();

//数量的样式
nCell = nRow.getCell(4);
CellStyle numStyle = nCell.getCellStyle();

//生产厂家的样式
nCell = nRow.getCell(5);
CellStyle factoryStyle = nCell.getCellStyle();

//日期的样式
nCell = nRow.getCell(6);
CellStyle dateStyle = nCell.getCellStyle();

//贸易条款的样式
nCell = nRow.getCell(8);
CellStyle tradeStyle = nCell.getCellStyle();

//处理大标题
nRow = sheet.getRow(rowNo++);           //获取一个行对象
nCell = nRow.getCell(colNo);            //获取一个单元格对象
nCell.setCellValue(inputDate.replaceFirst("-0", "-").replaceFirst("-", "年") + "月份出货表");     //yyyy-MM

rowNo++;                                //跳过静态表格头

//处理内容
List<OutProductVO> dataList = outProductService.find(inputDate);
for(int j=0;j<dataList.size();j++){
colNo = 1;              //初始化
OutProductVO op = dataList.get(j);

nRow = sheet.createRow(rowNo++);
nRow.setHeightInPoints(24);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getCustomName());
nCell.setCellStyle(customStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getContractNo());
nCell.setCellStyle(contractNoStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getProductNo());
nCell.setCellStyle(productNoStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getCnumber());
nCell.setCellStyle(numStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getFactoryName());
nCell.setCellStyle(factoryStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getDeliveryPeriod());
nCell.setCellStyle(dateStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getShipTime());
nCell.setCellStyle(dateStyle);

nCell = nRow.createCell(colNo++);
nCell.setCellValue(op.getTradeTerms());
nCell.setCellStyle(tradeStyle);
}

//      OutputStream os = new FileOutputStream("c:\\outproduct.xls");
//      wb.write(os);
//
//      os.flush();
//      os.close();

ByteArrayOutputStream os = new ByteArrayOutputStream();
wb.write(os);

DownloadUtil downloadUtil = new DownloadUtil();             //直接弹出下载框，用户可以打开，可以保存
downloadUtil.download(os, response, "出货表.xlsx");

os.flush();
os.close();
}

//大标题样式
private CellStyle bigTitleStyle(Workbook wb){
CellStyle curStyle = wb.createCellStyle();
Font curFont = wb.createFont();

curFont.setFontName("宋体");
curFont.setFontHeightInPoints((short)16);
curFont.setBoldweight(Font.BOLDWEIGHT_BOLD);                    //字体加粗

curStyle.setFont(curFont);                                      //绑定字体

curStyle.setAlignment(CellStyle.ALIGN_CENTER);                  //横向居中
curStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);       //纵向居中

return curStyle;
}

//小标题样式
private CellStyle titleStyle(Workbook wb){
CellStyle curStyle = wb.createCellStyle();
Font curFont = wb.createFont();

curFont.setFontName("黑体");
curFont.setFontHeightInPoints((short)12);

curStyle.setFont(curFont);                                      //绑定字体

curStyle.setAlignment(CellStyle.ALIGN_CENTER);                  //横向居中
curStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);       //纵向居中

curStyle.setBorderTop(CellStyle.BORDER_THIN);                   //设置四周边线，细线
curStyle.setBorderBottom(CellStyle.BORDER_THIN);
curStyle.setBorderLeft(CellStyle.BORDER_THIN);
curStyle.setBorderRight(CellStyle.BORDER_THIN);

return curStyle;
}

//文字样式
private CellStyle textStyle(Workbook wb, CellStyle curStyle, Font curFont){

curFont.setFontName("Times New Roman");
curFont.setFontHeightInPoints((short)10);

curStyle.setFont(curFont);                                      //绑定字体

curStyle.setAlignment(CellStyle.ALIGN_LEFT);                    //横向居左
curStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);       //纵向居中

curStyle.setBorderTop(CellStyle.BORDER_THIN);                   //设置四周边线，细线
curStyle.setBorderBottom(CellStyle.BORDER_THIN);
curStyle.setBorderLeft(CellStyle.BORDER_THIN);
curStyle.setBorderRight(CellStyle.BORDER_THIN);

return curStyle;
}
}

package cn.itcast.util;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

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

public class DownloadUtil {

/**
* @param filePath 要下载的文件路径
* @param returnName 返回的文件名
* @param response HttpServletResponse
* @param delFlag 是否删除文件
*/
protected void download(String filePath,String returnName,HttpServletResponse response,boolean delFlag){
this.prototypeDownload(new File(filePath), returnName, response, delFlag);
}

/**
* @param file 要下载的文件
* @param returnName 返回的文件名
* @param response HttpServletResponse
* @param delFlag 是否删除文件
*/
protected void download(File file,String returnName,HttpServletResponse response,boolean delFlag){
this.prototypeDownload(file, returnName, response, delFlag);
}

/**
* @param file 要下载的文件
* @param returnName 返回的文件名
* @param response HttpServletResponse
* @param delFlag 是否删除文件
*/
public void prototypeDownload(File file,String returnName,HttpServletResponse response,boolean delFlag){
// 下载文件
FileInputStream inputStream = null;
ServletOutputStream outputStream = null;
try {
if(!file.exists()) return;
response.reset();
//设置响应类型    PDF文件为"application/pdf"，WORD文件为："application/msword"， EXCEL文件为："application/vnd.ms-excel"。
response.setContentType("application/octet-stream;charset=utf-8");

//设置响应的文件名称,并转换成中文编码
//returnName = URLEncoder.encode(returnName,"UTF-8");
returnName = response.encodeURL(new String(returnName.getBytes(),"iso8859-1")); //保存的文件名,必须和页面编码一致,否则乱码

//attachment作为附件下载；inline客户端机器有安装匹配程序，则直接打开；注意改变配置，清除缓存，否则可能不能看到效果
response.addHeader("Content-Disposition",   "attachment;filename="+returnName);

//将文件读入响应流
inputStream = new FileInputStream(file);
outputStream = response.getOutputStream();
int length = 1024;
int readLength=0;
byte buf[] = new byte[1024];
readLength = inputStream.read(buf, 0, length);
while (readLength != -1) {
outputStream.write(buf, 0, readLength);
readLength = inputStream.read(buf, 0, length);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
outputStream.flush();
} catch (IOException e) {
e.printStackTrace();
}
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
//删除原文件

if(delFlag) {
file.delete();
}
}
}

/**
* by tony 2013-10-17
* @param byteArrayOutputStream 将文件内容写入ByteArrayOutputStream
* @param response HttpServletResponse  写入response
* @param returnName 返回的文件名
*/
public void download(ByteArrayOutputStream byteArrayOutputStream, HttpServletResponse response, String returnName) throws IOException{
response.setContentType("application/octet-stream;charset=utf-8");
returnName = response.encodeURL(new String(returnName.getBytes(),"iso8859-1"));         //保存的文件名,必须和页面编码一致,否则乱码
response.addHeader("Content-Disposition",   "attachment;filename=" + returnName);
response.setContentLength(byteArrayOutputStream.size());

ServletOutputStream outputstream = response.getOutputStream();  //取得输出流
byteArrayOutputStream.writeTo(outputstream);                    //写到输出流
byteArrayOutputStream.close();                                  //关闭
outputstream.flush();                                           //刷数据
}
}