java使用poi导出Excel（Excel为双标题）

package test;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

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;
import org.apache.poi.hssf.util.Region;

public class ExportExcelPoi {
/*
* 参数：
* title：sheet页名称
* headers：标题栏数组，支持双行标题
* dataset：具体要在Excel中显示的数据链表
* out：输出路径
*/
public void exportExcel(String title, String[] headers, List<List<String>> dataset, OutputStream out) {
// 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15个字节
sheet.setDefaultColumnWidth((short) 15);
// 生成一个样式
HSSFCellStyle style = workbook.createCellStyle();
// 设置这些样式
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);
// 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);
// 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("这里是设置作者");

// 产生表格标题行
HSSFRow row = sheet.createRow(0);
HSSFRow row2 = sheet.createRow(1);
for(short i = 0, n = 0; i < headers.length; i++){//i是headers的索引，n是Excel的索引
HSSFCell cell1 = row.createCell(n);
cell1.setCellStyle(style);
HSSFRichTextString text = null;
if(headers[i].contains(":")){//双标题
String[] temp = headers[i].split(":");
text = new HSSFRichTextString(temp[0]);
String[] tempSec = temp[1].split(",");
sheet.addMergedRegion(new Region(0, n, 0, (short) (n + tempSec.length -1)));
short tempI = n;
for(int j = 0; j < tempSec.length -1; j++){
HSSFCell cellT = row.createCell(++tempI);
cellT.setCellStyle(style);
}
for(int j = 0; j < tempSec.length; j++){
HSSFCell cell2 = row2.createCell(n++);
cell2.setCellStyle(style);
cell2.setCellValue(new HSSFRichTextString(tempSec[j]));
}
}else{//单标题
HSSFCell cell2 = row2.createCell(n);
cell2.setCellStyle(style);
text = new HSSFRichTextString(headers[i]);
sheet.addMergedRegion(new Region(0, n, 1, n));
n++;
}
cell1.setCellValue(text);
}
// 遍历集合数据，产生数据行
for (int i = 0, index = 2; i < dataset.size(); i++, index++) {
row = sheet.createRow(index);
for (int j = 0; j < ((ArrayList)dataset.get(i)).size(); j++) {
HSSFCell cell = row.createCell((short) j);
cell.setCellStyle(style2);
HSSFRichTextString richString = new HSSFRichTextString(dataset.get(i).get(j));
cell.setCellValue(richString);
}
}
try{
workbook.write(out);
}catch(IOException e){
e.printStackTrace();
}
}
public static void main(String[] args) {
ExportExcelPoi eep = new ExportExcelPoi();
String[] titles = {"标题一", "标题二", "标题三:3.1,3.2", "标题四:4.1,4.2", "标题五", "标题六", "标题七", "标题八"};
String[] titles2 = {"1", "2", "3"};
List<List<String>> dataset = new ArrayList<List<String>>();//excel要显示的数据，从数据库中查出。
List<String> content = new ArrayList<String>();
content.add("我是要显示的文字");
content.add("我是要显示的文字");
content.add("我是要显示的文字");
content.add("我是要显示的文字");
content.add("我是要显示的文字");
content.add("555");
content.add("555");
content.add("555");
content.add("555");
content.add("555");
dataset.add(content);
dataset.add(content);
dataset.add(content);
dataset.add(content);
try {
OutputStream out = new FileOutputStream("D://outExcel.xls");
eep.exportExcel("第一个sheet页", titles, dataset, out);
OutputStream out2 = new FileOutputStream("D://outExcel2.xls");
eep.exportExcel("第一个sheet页", titles2, dataset, out2);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}