数据导出客户端自动下载

package com.lala.teamtoneback.code.common.util;

import java.io.BufferedOutputStream;

import java.io.OutputStream;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.UnderlineStyle;
import jxl.write.Label;
import jxl.write.NumberFormats;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;

public class ExcelUtil{
/**
* Excle数据导出
* @param workbook 工作薄
* @param sheet 工作表
* @param str 表头
* @param list 写入数据，数据格式list<list<String>>
* @throws Exception
*/
public static void writeExcel(String workbook,String sheet,List<String> str,
List<List<String>> list) throws Exception{
HttpServletResponse response = ServletActionContext.getResponse();
// 清空response
response.reset();
// 设置response的Header
response.addHeader("Content-Disposition", "attachment;filename=" + new String(workbook.getBytes("gb2312"), "ISO8859-1" ));
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
//创建工作簿
WritableWorkbook wwb = Workbook.createWorkbook(response.getOutputStream());

//创建工作表
WritableSheet ws = wwb.createSheet(sheet, 0);
//创建表头,第一行
for (int i = 0; i < str.size(); i++)
{
ws.addCell(new Label(i, 0, str.get(i),getHeaderCellStyle()));
}
//写入数据到Excel
for (int j = 0; j <list.size(); j++)
{
for (int i = 0; i < str.size(); i++)
{
ws.addCell(new Label(i, j+1, list.get(j).get(i).toString()));
}
}

wwb.write();
wwb.close();
toClient.flush();
toClient.close();
}
/**
* 表头单元格样式的设定
*/
public static WritableCellFormat getHeaderCellStyle(){

/*
* WritableFont.createFont("宋体")：设置字体为宋体
* 10：设置字体大小
* WritableFont.BOLD:设置字体加粗（BOLD：加粗 NO_BOLD：不加粗）
* false：设置非斜体
* UnderlineStyle.NO_UNDERLINE：没有下划线
*/
WritableFont font = new WritableFont(WritableFont.createFont("宋体"),
10,
WritableFont.BOLD,
false,
UnderlineStyle.NO_UNDERLINE);

WritableCellFormat headerFormat = new WritableCellFormat(NumberFormats.TEXT);
try {
//添加字体设置
headerFormat.setFont(font);
//设置单元格背景色：表头为黄色
//headerFormat.setBackground(Colour.YELLOW);
//设置表头表格边框样式
//整个表格线为粗线、黑色
//headerFormat.setBorder(Border.ALL, BorderLineStyle.THICK, Colour.BLACK);
//表头内容水平居中显示
headerFormat.setAlignment(Alignment.CENTRE);
} catch (WriteException e) {
System.out.println("表头单元格样式设置失败！");
}
return headerFormat;
}
}