JavaEE_POI导出Excel (网络下载) +（本地导出） 工具类的编写
博主这几天忙活了报表数据用Excel导出的功能：
这里给出这个Demo的下载地址（MyEclipse2014 下开发，喜欢的朋友在文章下面评论 或给个赞）
http://pan.baidu.com/s/1hr9qcLY
涉及到了几方面的知识，总结如下：
1.POI 导出Excel
2.JavaEE 通过HttpResponseSevlet 实现文件下载
3.Excel 文件名下载中文的显示
http://blog.csdn.net/u010003835/article/details/50857611
1.POI 导出Excel:
先讲解步骤：
（1）.导入POI包 本文这里用的是POI 3.9 链接 http://pan.baidu.com/s/1i4xAAjz
（2）.POI 创建 Excel
0. 创建工作本
// 0.创建工作本 HSSFWorkbook excelWorkBook = new HSSFWorkbook();
1. 创建Excel表
excelName是指定当前Excel的表名
// 1.创建表
HSSFSheet excelSheet = null;
if (this.excelName == null) {
this.excelName = new String();
}
excelSheet = excelWorkBook.createSheet(this.excelName);
2. 创建表头并设置表头项
表头即第0行,其他的数据即从第1行开始，当然可以不创建表头
// 2.创建表头: 创建一行
HSSFRow headerRow = excelSheet.createRow((short) 0);
for (int i = 0; i < this.excelHeaders.length; i++) {
// 创建一个单元格
HSSFCell headerCell = headerRow.createCell((short) i);
// headerCell.setEncoding(HSSFCell.ENCODING_UTF_16);
// CellStyle cs = new CellStyle();
// 设置cell的值
headerCell.setCellValue(excelHeaders[i]);
}
3. 根据查询出来的值(JavaBean)设置单元格
// 3.根据查询出来的结果集results，填写excel表格
if (results != null) {
T objectT = null;
for (int index = 0; index < results.size(); index++) {
// 4.创建一行
HSSFRow tableRow = excelSheet.createRow((short) index + 1); // 创建行，因为第一行是表头,
// 即row(0)
objectT = results.get(index);
//this.selectedTableCells(tableRow, objectT);
// ********** selectedTableCell的大致实现 ***********
HSSFRow row = demoSheet.createRow((short) index);
for (short i = 0; i < cells.size(); i++) {
// 创建第i个单元格
HSSFCell cell = row.createCell((short) i);
// cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue(cells.get(i));
}
}
}
4. 导出Excel文件，通过IO流
//判断是下载到指定路径，还是网络下载，
//本地下载，创建本地文件流，
//否则，利用repsonse的文件流
if(this.getResponse() == null){
OutputStream ioFileStream = null;
try {
ioFileStream = new FileOutputStream(this.filePath + this.fileName +".xls");
excelWorkBook.write(ioFileStream);
ioFileStream.flush();
ioFileStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
（3）.一个完整的栗子（还用到了JDBC连接。。。，不熟悉的同学去网上找个栗子，需要JDBC链接包）
简单例子：存粹的POI导出Excel
文档目录结构：
JavaBean: User
package bean;
public class User {
private Integer index;
private String userName;
private String password;
public Integer getIndex() {
return index;
}
public void setIndex(Integer index) {
this.index = index;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public static void main(String[] args) {
User user = null;
user.getIndex();
}
}
Excel导出类: ExcelUtilVersionTwo.java
package util;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import javax.swing.JOptionPane;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
public abstract class ExcelUtilVersionTwo<T> implements TableCells<T> {
private String[] excelHeaders = new String[] {};// excel表头
private String excelName = new String(); // execl表名
private Integer cellsNum = 0; // 导出的单元格有几列
private String fileName = new String(); // 导出的文件的名字
public String[] getExcelHeaders() {
return excelHeaders;
}
public void setExcelHeaders(String[] excelHeaders) {
this.excelHeaders = excelHeaders;
}
public String getExcelName() {
return excelName;
}
public void setExcelName(String excelName) {
this.excelName = excelName;
}
public Integer getCellsNum() {
return cellsNum;
}
public void setCellsNum(Integer cellsNum) {
this.cellsNum = cellsNum;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
@Override
public abstract void selectedTableCells(HSSFRow tableRow, T t);
@SuppressWarnings("deprecation")
public void exportExcel(List<T> results) {
// 0.创建工作本
HSSFWorkbook excelWorkBook = new HSSFWorkbook();
// 1.创建表
HSSFSheet excelSheet = null;
if (this.excelName == null) {
this.excelName = new String();
}
excelSheet = excelWorkBook.createSheet(this.excelName);
// 2.创建表头: 创建一行
HSSFRow headerRow = excelSheet.createRow((short) 0);
for (int i = 0; i < this.excelHeaders.length; i++) {
// 创建一个单元格
HSSFCell headerCell = headerRow.createCell((short) i);
// headerCell.setEncoding(HSSFCell.ENCODING_UTF_16);
// CellStyle cs = new CellStyle();
// 设置cell的值
headerCell.setCellValue(excelHeaders[i]);
}
// 3.根据查询出来的结果集results，填写excel表格
if (results != null) {
T objectT = null;
for (int index = 0; index < results.size(); index++) {
// 4.创建一行
HSSFRow tableRow = excelSheet.createRow((short) index + 1); // 创建行，因为第一行是表头,
// 即row(0)
objectT = results.get(index);
this.selectedTableCells(tableRow, objectT);
// ********** selectedTableCell的大致实现 ***********
// HSSFRow row = demoSheet.createRow((short) index);
// for (short i = 0; i < cells.size(); i++) {
// // 创建第i个单元格
// HSSFCell cell = row.createCell((short) i);
// // cell.setEncoding(HSSFCell.ENCODING_UTF_16);
// cell.setCellValue(cells.get(i));
// }
}
}
// 4.将excel导出到文件中
FileOutputStream out = null;
// 如果没有名字则文件名为data时间+excelName
if (this.fileName.equals(new String())) {
SimpleDateFormat tmp = new SimpleDateFormat("yyyyMMddHHmmssSSS");
String dateStr = tmp.format(new Date());
this.setFileName(dateStr + this.getExcelName());
}
try {
out = new FileOutputStream(fileName);
// excelSheet.setGridsPrinted(true);
// HSSFFooter footer = excelSheet.getFooter();
// footer.setRight("Page " + HSSFFooter.page() + " of "
// + HSSFFooter.numPages());
excelWorkBook.write(out);
JOptionPane.showMessageDialog(null, "表格已成功导出到 : " + fileName);
} catch (Exception e) {
JOptionPane.showMessageDialog(null, "表格导出出错，错误信息 ：" + e
+ "\n错误原因可能是表格已经打开。");
e.printStackTrace();
}
}
public void exportExcel(List<T> results, String[] headers, String excelName) {
this.setExcelHeaders(headers);
this.setExcelName(excelName);
this.exportExcel(results);
}
/**
* @note 导出excel报表
* @param results
* 查询出来的结果集
* @param headers
* 表格的头
* @param excelName
* excel报表名
* @param fileName
* 导出的excel文件名
*/
public void exportExcel(List<T> results, String[] headers,
String excelName, String fileName) {
this.setExcelHeaders(headers);
this.setExcelName(excelName);
this.setFileName(fileName);
this.exportExcel(results);
}
public static void main(String[] args) {
Date date = new Date();
String fileName = "D:\\用户导出报表" + date.toString() + ".xls";
System.out.println(fileName);
String[] list = new String[] {};
System.out.println(list.length);
}
}
接口： TableCells<T>
package util;
import org.apache.poi.hssf.usermodel.HSSFRow;
/**
* @author szh
* @date 2016-3-9
* @param <T>
*/
public interface TableCells<T> {
/**
* @note 该接口在ExcelUtil中被实现，主要功能： 根据 T(po类)指定字段 设置tableRow的数据,
* 并可以做一定的业务处理，（更好的实现方式，在ExcelUtil中做成抽象方法）
* @param tableRow
* @param t
*/
void selectedTableCells(HSSFRow tableRow, T t);
}
导出Excel测试类：ExportExcelUser
package service;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import util.ExcelUtilVersionTwo;
import bean.User;
public class ExportExcelUser extends ExcelUtilVersionTwo<User> {
@Override
public void selectedTableCells(HSSFRow tableRow, User t) {
HSSFCell indexCell = tableRow.createCell(0);
indexCell.setCellValue(t.getIndex());
HSSFCell userNameCell = tableRow.createCell(1);
userNameCell.setCellValue(t.getUserName());
HSSFCell passCell = tableRow.createCell(2);
passCell.setCellValue(t.getPassword());
}
public List<User> getAllUser() {
List<User> useList = new ArrayList<User>();
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/test", "root", "123456");
Statement sm = conn.createStatement();
ResultSet rs = sm.executeQuery("select id,name,password from user");
while (rs.next()) {
List<String> list = new ArrayList<String>();
for (int i = 1; i <= 3; i++) {
list.add(rs.getString(i));
}
User user = new User();
user.setIndex(Integer.valueOf(list.get(0)));
user.setUserName(list.get(1));
user.setPassword(list.get(2));
useList.add(user);
}
} catch (Exception e) {
e.printStackTrace();
}
return useList;
}
public static void main(String[] args) {
ExportExcelUser exportExcelUser = new ExportExcelUser();
List<User> list = exportExcelUser.getAllUser();
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i).getIndex() + " "
+ list.get(i).getUserName() + " "
+ list.get(i).getPassword());
}
exportExcelUser.exportExcel(list, new String[] { "序号", "用户名", "密码" },
"用户信息表", "D:\\user表信息.xls");
}
}
表结构：
测试用例：
2.JavaEE 通过HttpResponseSevlet 实现文件下载
http://www.cnblogs.com/xdp-gacl/p/4200090.html
这里结合前后台给大家讲解一下： 项目中用到的框架是Spring+SpringMvc+Mybatis
前台页面：
前台页面中的Html 部分
点击导出按钮的js效果：（注意这里不能通过JQuery Post,Get等Ajax方法，因为JavaScrip中没有文件流的概念，讲解请参考博文
1. JAVA WEB用servlet下载文件不能弹出对话框
http://bbs.csdn.net/topics/390630180
2. http://www.jb51.net/article/53479.htm）
/* 导出excel */
$(function(){
$("#exportExcel").click(function(){
var url = appCtx+"userClassDailyTotal/exportExcel.do"+"?"+$("#listForm").serialize();
//将表单序列化提交
window.location.href = url;
});
});
后台SpringMvc
Controller部分：
/**
* @param userClassMonthlyTotal
* @param request
* @param response
* @param session
* @return
* @throws Exception
*/
@SuppressWarnings("unused")
@RequestMapping(value = "/exportExcel.do")
public ModelAndView exportExcel(UserClassMonthlyTotal userClassMonthlyTotal, HttpServletRequest request, HttpServletResponse response, HttpSession session) throws Exception {
Object obj = session.getAttribute(ConstantAdmin.SESSION_ADMIN_INFO);
if (obj instanceof UserOrganization) {
UserOrganization userOrg = (UserOrganization) obj;
int organizationId = userOrg.getOrganizationId();
userClassMonthlyTotal.setOrganizationId(organizationId);
} else if (obj instanceof SysUser) {
SysUser user = (SysUser) obj;
}
userClassMonthlyTotalService.selectExportExcel(userClassMonthlyTotal, response);
return null;
}
Service部分：
@Transactional(propagation=Propagation.NOT_SUPPORTED)
public void selectExportExcel(UserClassMonthlyTotal userClassMonthlyTotal, HttpServletResponse response){
List<UserClassMonthlyTotal> list = userClassMonthlyTotalMapper.selectBySelectiveNoPage(userClassMonthlyTotal);
class UserClassMonthlyStatExcel extends ExcelUtilVersionTwo<UserClassMonthlyTotal>{
@Override
public void selectedTableCells(HSSFRow tableRow,
UserClassMonthlyTotal t) {
DecimalFormat floatConvert = new DecimalFormat("##0.00");
SimpleDateFormat monthConvert = new SimpleDateFormat("yyyy-MM");
tableRow.createCell(0).setCellValue(t.getUserName());
tableRow.createCell(1).setCellValue(floatConvert.format(t.getShouldHour()));
tableRow.createCell(2).setCellValue(floatConvert.format(t.getActualHour()));
tableRow.createCell(3).setCellValue(floatConvert.format(t.getOvertimeHour()));
tableRow.createCell(4).setCellValue(floatConvert.format(t.getAbsentDay()));
tableRow.createCell(5).setCellValue(t.getDelayCount());
tableRow.createCell(6).setCellValue(t.getEarlyLeaveCount());
tableRow.createCell(7).setCellValue(monthConvert.format(t.getUserClassMonth()));
}
}
UserClassMonthlyStatExcel userMonthlyStat = new UserClassMonthlyStatExcel();
SimpleDateFormat convert = new SimpleDateFormat("yyyyMMddHHmmssSSS");
Date now = new Date();
String nowString = convert.format(now);
userMonthlyStat.exportExcel(list, new String[]{"用户名","应工作时长(时)","实际工作时长(时)","加班时长(时)","缺勤时长(时)","迟到次数(次)","早退次数(次)","统计月份"},"每月统计报表", nowString+"每月统计报表", response);
}
编写的接口：selectTableCells
package cn._2vin.yannan.util;
import org.apache.poi.hssf.usermodel.HSSFRow;
/**
* @author szh
* @date 2016-3-9
* @param <T>
*/
public interface TableCells<T> {
/**
* @note 该接口在ExcelUtil中被实现，主要功能： 根据 T(po类)指定字段 设置tableRow的数据,
* 并可以做一定的业务处理，（更好的实现方式，在ExcelUtil中做成抽象方法）
* @param tableRow
* @param t
*/
void selectedTableCells(HSSFRow tableRow, T t);
}
包装的接口类：可以实现下载数据到本地指定路径和从网络下载两种功能。里面涵盖了中文文件名下载解决地方法：http://blog.csdn.net/u010003835/article/details/50857611
package cn._2vin.yannan.util;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
public abstract class ExcelUtilVersionTwo<T> implements TableCells<T> {
private String[] excelHeaders = new String[] {};// excel表头
private String excelName = new String(); // execl表名
private String filePath = new String(); // 存储到本地的实际路径
private String fileName = new String(); // 导出的文件的名字
private HttpServletResponse response = null; //HttpResponse
public String[] getExcelHeaders() {
return excelHeaders;
}
public void setExcelHeaders(String[] excelHeaders) {
this.excelHeaders = excelHeaders;
}
public String getExcelName() {
return excelName;
}
public void setExcelName(String excelName) {
this.excelName = excelName;
}
public String getFilePath() {
return filePath;
}
public void setFilePath(String filePath) {
this.filePath = filePath;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
private HttpServletResponse getResponse() {
return response;
}
private void setResponse(HttpServletResponse response) {
this.response = response;
}
@Override
public abstract void selectedTableCells(HSSFRow tableRow, T t);
@SuppressWarnings("deprecation")
private void exportExcel(List<T> results){
// 0.创建工作本
HSSFWorkbook excelWorkBook = new HSSFWorkbook();
// 1.创建表
HSSFSheet excelSheet = null;
if (this.excelName == null) {
this.excelName = new String();
}
excelSheet = excelWorkBook.createSheet(this.excelName);
// 2.创建表头: 创建一行
HSSFRow headerRow = excelSheet.createRow((short) 0);
for (int i = 0; i < this.excelHeaders.length; i++) {
// 创建一个单元格
HSSFCell headerCell = headerRow.createCell((short) i);
// headerCell.setEncoding(HSSFCell.ENCODING_UTF_16);
// CellStyle cs = new CellStyle();
// 设置cell的值
headerCell.setCellValue(excelHeaders[i]);
}
// 3.根据查询出来的结果集results，填写excel表格
if (results != null) {
T objectT = null;
for (int index = 0; index < results.size(); index++) {
// 4.创建一行
HSSFRow tableRow = excelSheet.createRow((short) index + 1); // 创建行，因为第一行是表头,
// 即row(0)
objectT = results.get(index);
this.selectedTableCells(tableRow, objectT);
// ********** selectedTableCell的大致实现 ***********
// HSSFRow row = demoSheet.createRow((short) index);
// for (short i = 0; i < cells.size(); i++) {
// // 创建第i个单元格
// HSSFCell cell = row.createCell((short) i);
// // cell.setEncoding(HSSFCell.ENCODING_UTF_16);
// cell.setCellValue(cells.get(i));
// }
}
}
// 4.将excel导出到文件中
// 如果没有名字则文件名为data时间+excelName
if (this.fileName.equals(new String()) || this.fileName==null) {
SimpleDateFormat tmp = new SimpleDateFormat("yyyyMMddHHmmssSSS");
String dateStr = tmp.format(new Date());
this.setFileName(dateStr + this.getExcelName());
}
//判断是下载到指定路径，还是网络下载，
//本地下载，创建本地文件流，
//否则，利用repsonse的文件流
if(this.getResponse() == null){
OutputStream ioFileStream = null;
try {
ioFileStream = new FileOutputStream(this.filePath + this.fileName +".xls");
excelWorkBook.write(ioFileStream);
ioFileStream.flush();
ioFileStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
else{
this.response.setContentType("application/vnd.ms-excel");
this.response.setHeader("Cache-Control", "no-store");
SimpleDateFormat createDayConvert = new SimpleDateFormat("yyyyMMddHHmmssSSS"); //日期转换器
String fileString = createDayConvert.format(new Date())+this.excelName + ".xls";
//解决中文乱码问题
try {
response.setHeader("Content-Disposition", "attachment; filename="
+ new String( fileString.getBytes("utf-8"), "ISO8859-1" ));
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
OutputStream ioWebStream = null;
try {
ioWebStream = response.getOutputStream();
excelWorkBook.write(ioWebStream);
ioWebStream.flush();
ioWebStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
/**
* @note 从页面上下载excel表格
* @param results 查询出来的结果集
* @param headers 表格的头
* @param excelName excel表名
* @param fileName 导出的excel文件名
* @param response HttpServletResponse
*/
public void exportExcel(List<T> results, String[] headers, String excelName, String fileName, HttpServletResponse response) {
this.setExcelHeaders(headers);
this.setExcelName(excelName);
this.setFileName(fileName);
this.setResponse(response);
this.exportExcel(results);
}
/**
* @note 导出excel报表到本地的指定路径
* @param results 查询出来的结果集
* @param headers 表格的头
* @param excelName excel表名
* @param filePath 本地的存储路径
* @param fileName 导出的excel文件名
*/
public void exportExcel(List<T> results, String[] headers,
String excelName, String filePath, String fileName) {
this.setExcelHeaders(headers);
this.setExcelName(excelName);
this.setFilePath(filePath);
this.setFileName(fileName);
this.exportExcel(results);
}
}