poi 对查询结果导出到excel

poi 对查询出来的list数据进行导出至excel表格中。

工具类:

import java.io.IOException;

import java.io.OutputStream;

import java.util.List;

import java.util.Map;

import java.util.regex.Pattern;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;

import org.apache.poi.hssf.usermodel.HSSFClientAnchor;

import org.apache.poi.hssf.usermodel.HSSFComment;

import org.apache.poi.hssf.usermodel.HSSFFont;

import org.apache.poi.hssf.usermodel.HSSFPatriarch;

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.HSSFColor;

public class ExportUtils {

@SuppressWarnings("unchecked")

public static void exportExcel(String title, String[] headers,String[] fields,List<Map<String, Object>> dataset,HSSFWorkbook workbook){

HSSFSheet sheet = workbook.createSheet(title);

sheet.setDefaultColumnWidth(25);

HSSFCellStyle style = workbook.createCellStyle();

style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);

style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

style.setBorderBottom(HSSFCellStyle.BORDER_THIN);

style.setBorderLeft(HSSFCellStyle.BORDER_THIN);

style.setBorderRight(HSSFCellStyle.BORDER_THIN);

style.setBorderTop(HSSFCellStyle.BORDER_THIN);

style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

HSSFFont font = workbook.createFont();

font.setColor(HSSFColor.VIOLET.index);

font.setFontHeightInPoints((short) 12);

font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

style.setFont(font);

HSSFCellStyle style2 = workbook.createCellStyle();

style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);

style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);

style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);

style2.setBorderRight(HSSFCellStyle.BORDER_THIN);

style2.setBorderTop(HSSFCellStyle.BORDER_THIN);

style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);

style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

HSSFFont font2 = workbook.createFont();

font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);

style2.setFont(font2);

HSSFPatriarch patriarch = sheet.createDrawingPatriarch();

HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,

0, 0, 0, (short) 4, 2, (short) 6, 5));

comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));

HSSFRow row = sheet.createRow(0);

for (int i = 0; i < headers.length; i++) {

HSSFCell cell = row.createCell(i);

cell.setCellStyle(style);

HSSFRichTextString text = new HSSFRichTextString(headers[i]);

cell.setCellValue(text);

}

int j = 1;

for (Map<String, Object> map : dataset) {

HSSFRow datarow = sheet.createRow( j++);

for(int i=0;i<fields.length;i++){

String fieldName= fields[i];

HSSFCell cell = datarow.createCell(i);

cell.setCellStyle(style2);

try {

HSSFRichTextString richString = new HSSFRichTextString(

map.get(fieldName)==null?"":map.get(fieldName).toString());

HSSFFont font3 = workbook.createFont();

font3.setColor(HSSFColor.BLUE.index);

richString.applyFont(font3);

// 解决数字格式的值导出到excel中变成文本格式

Pattern pattern = Pattern.compile("[-+]?[0-9]+(\\.[0-9]+)?"); //判断是否为double类型

if (richString != null && pattern.matcher(richString.toString()).matches())

cell.setCellValue(Double.parseDouble(richString.toString()));

else

cell.setCellValue(richString);

} catch (SecurityException e) {

e.printStackTrace();

}

}

}

}

}

方法调用：

public void exportExcel(HttpServletRequest request,HttpServletResponse response)

throws Exception {

List list = historyDataService.getReportExcel();

List reportExcelList = new ArrayList();

Iterator it = list.iterator();

while (it.hasNext()) {

ReportExcel reportExcel = (ReportExcel) it.next();

Map reportExceMap = new HashMap();

reportExceMap.put("name", reportExcel.getNAME());

reportExceMap.put("c1", reportExcel.getC1());

reportExceMap.put("c2", reportExcel.getC2());

reportExceMap.put("c3", reportExcel.getC3());

reportExceMap.put("c4", reportExcel.getC4());

reportExceMap.put("c5", reportExcel.getC5());

reportExceMap.put("c6", reportExcel.getC6());

reportExcelList.add(reportExceMap);

}

HSSFWorkbook workbook = new HSSFWorkbook();

Calendar cal = Calendar.getInstance();

cal.add(Calendar.DATE, -1);

SimpleDateFormat format1=new SimpleDateFormat("yyyy.MM.dd");

SimpleDateFormat format2=new SimpleDateFormat("MM.dd");

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式

String years = dateFormat.format(new Date());

int years_value = Integer.parseInt(years);

years_value--;

String presentYearYesterday=format1.format(cal.getTime());

String previousYearYesterday=years_value+"."+format2.format(cal.getTime());

String yesterday=format2.format(cal.getTime());

String[] headers = {"单位名称", presentYearYesterday+"当天销售额", previousYearYesterday+"当天销售额","同比增长率", "2014.7.1-"+yesterday+"累计销售额", "2013.7.1-"+yesterday+"累计销售额","同比增长率"};

String[] fields = {"name", "c1", "c2", "c3","c4", "c5", "c6"};

ExportUtils.exportExcel("分部每日销售跟进数据", headers, fields, reportExcelList,

workbook);

String agent = request.getHeader("User-Agent");

try {

boolean isFireFox = (agent != null && agent.toLowerCase().indexOf(

"firefox") != -1);

if (isFireFox) {

response.addHeader(

"Content-Disposition",

"attachment; filename*="

+ URLEncoder.encode("分部每日销售跟进表(to信息)", "utf-8") + ".xls");

} else {

response.addHeader(

"Content-Disposition",

"attachment; filename=\""

+ URLEncoder.encode("分部每日销售跟进表(to信息)", "utf-8") + ".xls"

+ "\"");

}

} catch (Exception e) {

response.addHeader("Content-Disposition", "attachment; filename=\""

+ URLEncoder.encode("分部每日销售跟进表(to信息)", "utf-8") + ".xls" + "\"");

}

response.setContentType("application/vnd.ms-excel");

workbook.write(response.getOutputStream());

}