数据库表导出成Excel工具类

package com.chinasofti.articlesys.util;

import java.io.FileOutputStream;
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.HSSFHeader;
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.ss.usermodel.HorizontalAlignment;
import org.apache.struts2.ServletActionContext;

import com.chinasofti.articlesys.bean.ArchiveBean;
import com.chinasofti.articlesys.bean.ArchiveBean;
import com.chinasofti.articlesys.service.ArchiveTypeService;

public class ExportUtilForQuery {

public static void export(List<ArchiveBean> list)throws Exception
{
if(list==null){
return;
}

/*HSSFWorkbook wb = new HSSFWorkbook();
// 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
HSSFSheet sheet = wb.createSheet("档案表");
sheet.setDefaultColumnWidth(20);
sheet.setDefaultRowHeight((short)15);
// 创建字体对象
HSSFCellStyle style = wb.createCellStyle();
HSSFFont font = wb.createFont();
font.setFontHeightInPoints((short)12);
//	       font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
font.setBold(true);

style.setAlignment(HorizontalAlignment.CENTER); // 居中
style.setFont(font);
// 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
HSSFRow row = sheet.createRow(0);

HSSFCell cell = row.createCell(0);
cell.setCellValue("档案编号");
cell.setCellStyle(style);
cell=row.createCell(1);
cell.setCellValue("档案标题");
cell.setCellStyle(style);
cell=row.createCell(2);
cell.setCellValue("档案内容");
cell.setCellStyle(style);
cell=row.createCell(3);
cell.setCellValue("创建人");
cell.setCellStyle(style);

for (int i = 0; i < list.size(); i++)
{
row = sheet.createRow(i+1);
ArchiveBean bean =list.get(i);
// 第四步，创建单元格，并设置值
row.createCell(0).setCellValue(bean.getArchiveNo());
row.createCell(1).setCellValue(bean.getTitle());
row.createCell(2).setCellValue(bean.getContent());
row.createCell(3).setCellValue(bean.getCreater().getName());
}  */

String []tableHeader={"档案编号","档案标题","档案内容","创建人"};
/*
*下面的都可以拷贝不用编写
*/
short cellNumber=(short)tableHeader.length;//表的列数
HSSFWorkbook workbook = new HSSFWorkbook(); //创建一个excel
HSSFCell cell = null; //Excel的列
HSSFRow row = null; //Excel的行
HSSFCellStyle style = workbook.createCellStyle(); //设置表头的类型
//	 	    style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
style.setAlignment(HorizontalAlignment.CENTER);
HSSFCellStyle style1 = workbook.createCellStyle(); //设置数据类型
//	 	    style1.setAlignment(HSSFCellStyle.ALIGN_CENTER);
style1.setAlignment(HorizontalAlignment.CENTER);
HSSFFont font = workbook.createFont(); //设置字体
HSSFSheet sheet = workbook.createSheet("sheet1"); //创建一个sheet
HSSFHeader header = sheet.getHeader();//设置sheet的头
try {              /**
*根据是否取出数据，设置header信息
*
*/
if(list.size() < 1 ){
header.setCenter("查无资料");
}else{
header.setCenter("档案表");
row = sheet.createRow(0);
row.setHeight((short)400);
for(int k = 0;k < cellNumber;k++){
cell = row.createCell(k);//创建第0行第k列
cell.setCellValue(tableHeader[k]);//设置第0行第k列的值
sheet.setColumnWidth(k,8000);//设置列的宽度
font.setColor(HSSFFont.COLOR_NORMAL); // 设置单元格字体的颜色.
font.setFontHeight((short)350); //设置单元字体高度
style1.setFont(font);//设置字体风格
cell.setCellStyle(style1);
}
/*
* // 给excel填充数据这里需要编写
*
*/
for(int i = 0 ;i < list.size() ;i++){
ArchiveBean beanType = list.get(i);//获取sign对象
row = sheet.createRow((short) (i + 1));//创建第i+1行
row.setHeight((short)400);//设置行高

if(beanType.getArchiveNo()!= null){
cell = row.createCell(0);//创建第i+1行第0列
cell.setCellValue(beanType.getArchiveNo());//设置第i+1行第0列的值
cell.setCellStyle(style);//设置风格
}
if(beanType.getTitle() != null){
cell = row.createCell(1); //创建第i+1行第1列

cell.setCellValue(beanType.getTitle());//设置第i+1行第1列的值

cell.setCellStyle(style); //设置风格
}
//由于下面的和上面的基本相同，就不加注释了
if(beanType.getContent() != null){
cell = row.createCell(2);
cell.setCellValue(beanType.getContent());
cell.setCellStyle(style);
}
if(beanType.getCreater()!= null){
cell = row.createCell(3);
cell.setCellValue(""+beanType.getCreater());
cell.setCellStyle(style);
}
/*if(sign.getSclass() != null){
cell = row.createCell(4);
cell.setCellValue(sign.getSclass());
cell.setCellStyle(style);
}
if(sign.getMdate()!= null){
cell = row.createCell(5);
cell.setCellValue(sign.getMdate());
cell.setCellStyle(style);
}*/

}

}

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

try
{   HttpServletResponse response=null;
OutputStream out = null;//创建一个输出流对象
try {
response = ServletActionContext.getResponse();//初始化HttpServletResponse对象
out = response.getOutputStream();//
response.setHeader("Content-disposition","attachment; filename="+"SearchResult"+".xls");//filename是下载的xls的名，建议最好用英文
response.setContentType("application/msexcel;charset=UTF-8");//设置类型
response.setHeader("Pragma","No-cache");//设置头
response.setHeader("Cache-Control","no-cache");//设置头
response.setDateHeader("Expires", 0);//设置日期头
workbook.write(out);
out.flush();

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

if(out!=null){
out.close();
}

}catch(IOException e){
e.printStackTrace();
}

}

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

}

//	        return null;
}
}