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import java.io.OutputStream;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.regex.Matcher;
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.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;
import org.apache.poi.hssf.util.Region;
/**
*
* @author Bruce Xu
*
* @param <T>
*/
public class ExcelUtil<T> {
/**
* 导出Excel的方法
* @param title excel中的sheet名称
* @param headers 表头
* @param result 结果集
* @param out 输出流
* @param pattern 时间格式
* @throws Exception
*/
public void exportExcel(String title, String[] headers,String[] columns, Collection<T> result, OutputStream out, String pattern) throws Exception{
// 声明一个工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
// 生成一个表格
HSSFSheet sheet = workbook.createSheet(title);
// 设置表格默认列宽度为20个字节
sheet.setDefaultColumnWidth((short)20);
// 生成一个样式
HSSFCellStyle style = workbook.createCellStyle();
// 设置这些样式
style.setFillForegroundColor(HSSFColor.GOLD.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);
// 生成一个字体
HSSFFont font = workbook.createFont();
font.setColor(HSSFColor.VIOLET.index);
//font.setFontHeightInPoints((short) 12);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 把字体应用到当前的样式
style.setFont(font);
// 指定当单元格内容显示不下时自动换行
style.setWrapText(true);
// 声明一个画图的顶级管理器
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
/*
以下可以用于设置导出的数据的样式
// 生成并设置另一个样式
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);
// 生成另一个字体
HSSFFont font2 = workbook.createFont();
font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式
style2.setFont(font2);
// 声明一个画图的顶级管理器
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
// 定义注释的大小和位置,详见文档
HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0, 0, 0, 0, (short) 4, 2, (short) 6, 5));
// 设置注释内容
comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
// 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
comment.setAuthor("leno");*/
// 产生表格标题行
//表头的样式
HSSFCellStyle titleStyle = workbook.createCellStyle();// 创建样式对象
titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER_SELECTION);// 水平居中
titleStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直居中
// 设置字体
HSSFFont titleFont = workbook.createFont(); // 创建字体对象
titleFont.setFontHeightInPoints((short) 15); // 设置字体大小
titleFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 设置粗体
// titleFont.setFontName("黑体"); // 设置为黑体字
titleStyle.setFont(titleFont);
sheet.addMergedRegion(new Region(0,(short)0,0,(short)(headers.length-1)));//指定合并区域
HSSFRow rowHeader = sheet.createRow(0);
HSSFCell cellHeader = rowHeader.createCell((short)0); //只能往第一格子写数据，然后应用样式，就可以水平垂直居中
HSSFRichTextString textHeader = new HSSFRichTextString(title);
cellHeader.setCellStyle(titleStyle);
cellHeader.setCellValue(textHeader);
HSSFRow row = sheet.createRow(1);
for (int i = 0; i < headers.length; i++) {
HSSFCell cell = row.createCell((short)i);
cell.setCellStyle(style);
HSSFRichTextString text = new HSSFRichTextString(headers[i]);
cell.setCellValue(text);
}
// 遍历集合数据，产生数据行
if(result != null){
int index = 2;
for(T t:result){
// Field[] fields = t.getClass().getDeclaredFields();
row = sheet.createRow(index);
index++;
for(short i = 0; i < columns.length; i++) {
HSSFCell cell = row.createCell(i);
// Field field = fields[i];
// String fieldName = field.getName();
String fieldName = columns[i];
String getMethodName = "get"
+ fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
Class tCls = t.getClass();
Method getMethod = tCls.getMethod(getMethodName, new Class[]{});
// getMethod.getReturnType().isInstance(obj);
Object value = getMethod.invoke(t, new Class[]{});
String textValue = null;
if(value == null) {
textValue = "";
}else if (value instanceof Date) {
Date date = (Date) value;
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
textValue = sdf.format(date);
} else if (value instanceof byte[]) {
// 有图片时，设置行高为60px;
row.setHeightInPoints(60);
// 设置图片所在列宽度为80px,注意这里单位的一个换算
sheet.setColumnWidth(i, (short) (35.7 * 80));
// sheet.autoSizeColumn(i);
byte[] bsValue = (byte[]) value;
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,
1023, 255, (short) 6, index, (short) 6, index);
anchor.setAnchorType(2);
patriarch.createPicture(anchor, workbook.addPicture(
bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
} else{
//其它数据类型都当作字符串简单处理
textValue = value.toString();
}
if(textValue!= null){
Pattern p = Pattern.compile("^//d+(//.//d+)?$");
Matcher matcher = p.matcher(textValue);
if(matcher.matches()){
//是数字当作double处理
cell.setCellValue(Double.parseDouble(textValue));
}else{
HSSFRichTextString richString = new HSSFRichTextString(textValue);
// HSSFFont font3 = workbook.createFont();
// font3.setColor(HSSFColor.BLUE.index);
// richString.applyFont(font3);
cell.setCellValue(richString);
}
}
}
}
}
workbook.write(out);
}
}
调用示例：以springmvc为例，导出数据库记录到Excel,弹出下载对话框
@RequestMapping(value="/exprotExcel")
public @ResponseBody String exprotExcel(HttpServletResponse response,NjWorkLog njWorkLog,@RequestParam(value="createUserIds",required=false) String createUserIds,@RequestParam(value="workLogGrantUsersName",required=false)String workLogGrantUsersName,@RequestParam(value="strWorkEndDate",required=false)String strWorkEndDate)
{
ExcelUtil<NjWorkLog> excelUtil=new ExcelUtil<NjWorkLog>();
OutputStream out=null;
try
{
out = response.getOutputStream();// 取得输出流
//out.flush();
response.reset();// 清空输出流
response.setHeader("Content-disposition", "attachment; filename="+new String("工作日志".getBytes("GB2312"),"8859_1")+".xls");// 设定输出文件头
response.setContentType("application/msexcel");// 定义输出类型
} catch (IOException e)
{
e.printStackTrace();
}
String[] headers ={"跟踪目标","工作时间","事项类型","项目名称","完成情况自述","工作量","进度","配合人员","加班","作者","附件名称"};
String[]columns={ "strTarget", "strWorkDate", "dictTypeId", "projectId", "strDesc", "bdWorkload", "strSchedule", "strCooperate","isOverTime","createUserId", "strFileName"};
if("on".equals(njWorkLog.getIsOverTime()))
njWorkLog.setIsOverTime("1");
else
njWorkLog.setIsOverTime("");
if(StringUtils.isNotBlank(createUserIds))
njWorkLog.setTempArray(createUserIds.split(","));
List<NjWorkLog> dataset=njWorkLogService.findMyAttentionExcel(njWorkLog);
try
{
excelUtil.exportExcel("工作日志", headers, columns, dataset, out, "");
} catch (Exception e1)
{
e1.printStackTrace();
}
try
{
out.close();
} catch (IOException e)
{
e.printStackTrace();
}
return null;
}