poi导出excel文件（桃）

1、基本可以通用的工具类

package com.idcsol.apps.common.excel;

import java.io.IOException;
import java.io.OutputStream;
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.CellRangeAddress;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.Region;

@SuppressWarnings("deprecation")
public class ExportExcel{

//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[]>();

HttpServletResponse response;

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

/*
* 导出数据
* */
public void export() 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 row2 = sheet.createRow(2);
HSSFRow rowRowName = sheet.createRow(3); // 在索引2的位置创建行(最顶端的行开始的第二行)

//根据自己的需要合并单元格
sheet.addMergedRegion(new Region(2,(short)0,3,(short)0));//（四个参数分别是）合并开始行，合并开始列，合并结束行，合并结束列
sheet.addMergedRegion(new Region(2,(short)1,3,(short)1));
sheet.addMergedRegion(new Region(2,(short)2,3,(short)2));
sheet.addMergedRegion(new Region(2,(short)3,3,(short)3));
sheet.addMergedRegion(new Region(2,(short)4,2,(short)6));
sheet.addMergedRegion(new Region(2,(short)7,3,(short)7));
sheet.addMergedRegion(new Region(2,(short)8,2,(short)9));
sheet.addMergedRegion(new Region(2,(short)10,3,(short)10));
sheet.addMergedRegion(new Region(2,(short)11,3,(short)11));
sheet.addMergedRegion(new Region(2,(short)12,3,(short)12));

// 将列头设置到sheet的单元格中
for(int n=0;n<columnNum;n++){
HSSFCell cellRowName = null; //创建列头对应个数的单元格
HSSFCell cellRowNamei_n = null; //创建列头对应个数的单元格
if(n < 4 || n==7 || n>9){
cellRowName = row2.createCell(n);
cellRowNamei_n = rowRowName.createCell(n);
}else{
cellRowName = rowRowName.createCell(n);
cellRowNamei_n = row2.createCell(n);
if (n==4) {
cellRowNamei_n.setCellValue("任（兼职状况）");
}else if (n==8){
cellRowNamei_n.setCellValue("资格种类");
}
}
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
cellRowNamei_n.setCellStyle(columnTopStyle);
}

//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+4);//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(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 = 0;
if (null != currentCell) {
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
{
String fileName = title + ".xls";
fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");
String headStr = "attachment; filename="" + fileName + """;
response.setContentType("APPLICATION/OCTET-STREAM");
response.setHeader("Content-Disposition", headStr);
OutputStream out = response.getOutputStream();
workbook.write(out);
}
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)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;

}
}

2、控制器中的使用方法

public void exportPostState(@ModelAttribute Page<PostState> page,
HttpSession httpSession,HttpServletResponse response) throws Exception {
PostState postState=new PostState();//可以替换成需要的类
// postState.setPostNo(orgId);
User user = (User) httpSession.getAttribute("user");
Organization organization = new Organization();
String title = "聘岗信息";//可以替换成需要的文件名
if (! "1".equals(user.getRoletype())) {
postState.setUnitNo(user.getUnitno());
organization = organizationService.selectByKey(user.getUnitno());
title = organization.getOrganizationName()+"-聘岗信息";
}
page.setRows(500);
List<PostState> list = postStateService.selectAll(page, postState).getRecords();//查询数据库中的相关数据
String[] rowsName = new String[]{"序号","姓名","岗位分类","所聘岗位名",
"周课时","任课年级","所数学科","无任课备注","教师资格种类","学科",
"现职称","年度考核","备注"}; //可以替换成需要的表头
List<Object[]> dataList = new ArrayList<Object[]>();
Object[] objs = null;
for (int i = 0; i < list.size(); i++) {
PostState post = list.get(i);
objs = new Object[rowsName.length];
objs[0] = i;
objs[1] = post.getPersonName() == null ? "":post.getPersonName();
objs[2] = post.getPostTypeName() == null ? "":post.getPostTypeName();
objs[3] = post.getPostName() == null ? "":post.getPostName();
objs[4] = post.getWorkload() == null ? "":post.getWorkload();
objs[5] = post.getGrade() == null ? "":post.getGrade();
objs[6] = post.getObjectName() == null ? "":post.getObjectName();
objs[7] = post.getOverworkRemarks() == null ? "":post.getOverworkRemarks();
objs[8] = post.getTeacherTypeName() == null ? "":post.getTeacherTypeName();
objs[9] = post.getTeacherObjectName() == null ? "":post.getTeacherObjectName();
objs[10] = post.getTitleName() == null ? "":post.getTitleName();
objs[11] = post.getCheckResultName() == null ? "":post.getCheckResultName();
objs[12] = post.getRemarks() == null ? "":post.getRemarks();
dataList.add(objs);
}
ExportExcel ex = new ExportExcel(title, rowsName, dataList,response);
ex.export();
}

注：导出不能用ajax连接后台，否则不会弹出选择文件保存位置的框

需要导入poi的jar包

maven中pom的写法：

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.8</version>
<exclusions>
<exclusion>
<artifactId>commons-codec</artifactId>
<groupId>commons-codec</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.8</version>
</dependency>