1、通用的导出函数
需要的jar包：
- servlet-api.jar
- poi-3.9.jar
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;
import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
/**
* 导出Excel公共方法
*
* @author zhanghb
* @version 1.0
*/
public class CommonExcel {
//显示的导出表的标题
private String title;
//导出表的列名
private String[] rowName;
//导出的文件名
private String fileName;
private List<Object[]> dataList = new ArrayList<Object[]>();
private HttpServletResponse response;
//构造方法，传入要导出的数据
public CommonExcel(String title, String[] rowName, List<Object[]> dataList, HttpServletResponse response, String fileName) {
this.dataList = dataList;
this.rowName = rowName;
this.title = title;
this.response = response;
this.fileName = fileName;
}
/*
* 导出数据
*/
public void downloadExcel() throws Exception {
try {
HSSFWorkbook 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);
//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
sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1)));
cellTiltle.setCellStyle(columnTopStyle);
cellTiltle.setCellValue(title);
// 定义所需列数
int columnNum = rowName.length;
HSSFRow rowRowName = sheet.createRow(2); // 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 + 3);//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;
if (columnWidth < length) {
columnWidth = length;
}
}
}
}
if (colNum == 0) {
sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
} else {
sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
}
}
if (workbook != null) {
try {
if (response != null) {
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename=\""+new String(fileName.getBytes("gb2312"),"ISO8859-1"));
OutputStream out = response.getOutputStream();
workbook.write(out);
out.close();
} else {
FileOutputStream outputStream = new FileOutputStream("D:/"+fileName);
workbook.write(outputStream);
outputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/*
* 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) 12);
//字体加粗
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
//设置字体名字
font.setFontName("微软雅黑");
//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();
//设置字体名字
font.setFontName("微软雅黑");
//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;
}
}测试方法：
public static void main(String[] args)throws Exception {
HttpServletResponse response=null;
String title = "xx报表";
String[] rowsName = new String[]{"oo","xx","oo","xx","xx","oo"};
List<Object[]> dataList = new ArrayList<Object[]>();
Object[] objs = null;
for (int i = 0; i < 10; i++) {
objs = new Object[rowsName.length];
objs[0] = i;
objs[1] = i;
objs[2] = i;
objs[3] = i;
objs[4] = i;
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String date = df.format(new Date());
objs[5] = date;
dataList.add(objs);
}
String fileName="xx报表-"+String.valueOf(System.currentTimeMillis()).substring(4,13)+".xls";
CommonExcel ex = new CommonExcel(title, rowsName, dataList,response,fileName);
ex.downloadExcel();
}结果：
由于遇到自动设置列宽时报空指针错误，数据为空时自动赋值为表头标题以及自身需求，所以进行了以下修改：主要时去掉自动设置列宽和表头标题，重新设置起始位置。
【response】为项目框架提供，所以不需要赋值。
/*
* 导出数据
*/
public void downloadExcel(String title, String[] rowName, List<Object[]> dataList, String fileName) throws Exception {
logger.info("============进入数据导出方法==============");
try {
HSSFWorkbook 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);*/
//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
/* sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1)));
cellTiltle.setCellStyle(columnTopStyle);
cellTiltle.setCellValue(title);*/
// 定义所需列数
int columnNum = rowName.length;
HSSFRow rowRowName = sheet.createRow(0); // 在索引0的位置创建行
// 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;
if (columnWidth < length) {
columnWidth = length;
}
}
}
}
if (colNum == 0) {
sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
} else {
sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
}
}*/
if (workbook != null) {
try {
if (response != null) {
logger.info("=======正在导出数据========");
// response.reset();
//response.getWriter().close();
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename=\""+new String(fileName.getBytes("gb2312"),"ISO8859-1"));
OutputStream out = response.getOutputStream();
workbook.write(out);
out.close();
logger.info("=======数据导出完毕=========");
} else {
FileOutputStream outputStream = new FileOutputStream("D:/"+fileName);
workbook.write(outputStream);
outputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}2、调用
public void ajaxGetPreRegisterOrderActivityList() throws Exception {
String [] rowName = {"序号","唯一标识","用户名","登记号码"};
title = "数据";
fileName = "数据"+createTime+"--"+endTime+"数据"+String.valueOf(System.currentTimeMillis()).substring(4,13)+".xls";
List<PreRegisterOrderVO> list = exportDataToExcelService.findPreRegisterOrderList(createTime,endTime);//获取该时间段的数据
List<Object[]> dataList = new ArrayList<Object[]>();
Object[] objs = null;
for (int i = 0; i < list.size(); i++) {
objs = new Object[rowName.length];
objs[0] = String.valueOf(i);
objs[1] = list.get(i).getId();
objs[2] = list.get(i).getUserName();
objs[3] = list.get(i).getMobile();
dataList.add(objs);
}
downloadExcel(title, rowName,dataList, fileName);
}3、前端执行【利用js执行】(后台设置createTime,endTime的Getter和Setter方法)
window.location.href = "${baseURL}/exportDataToExcel/exportDataToExcelAction!ajaxGetPreRegisterOrderActivityList.action?createTime="+beginTime+"&endTime="+endTime;本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
