import java.io.IOException;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
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.Region;
public class ExcelTest {
/**
* @param args
*/
public static void main(String[] args) throws IOException {
try {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("new sheet");
HSSFCellStyle style = wb.createCellStyle(); // 样式对象
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 水平
HSSFRow row = sheet.createRow((short) 0);
HSSFRow row2 = sheet.createRow((short) 1);
sheet.addMergedRegion(new Region(0, (short) 0, 1, (short) 0));
HSSFCell ce = row.createCell((short) 0);
ce.setEncoding(HSSFCell.ENCODING_UTF_16);// 中文处理
ce.setCellValue("项目\\日期"); // 表格的第一行第一列显示的数据
ce.setCellStyle(style); // 样式，居中
int num = 0;
for (int i = 0; i < 9; i++) { // 循环9次，每一次都要跨单元格显示
// 计算从那个单元格跨到那一格
int celln = 0;
int celle = 0;
if (i == 0) {
celln = 0;
celle = 1;
} else {
celln = (i * 2);
celle = (i * 2 + 1);
}
// 单元格合并
// 四个参数分别是：起始行，起始列，结束行，结束列
sheet.addMergedRegion(new Region(0, (short) (celln + 1), 0,
(short) (celle + 1)));
HSSFCell cell = row.createCell((short) (celln + 1));
cell.setCellValue("merging" + i); // 跨单元格显示的数据
cell.setCellStyle(style); // 样式
// 不跨单元格显示的数据，如：分两行，上一行分别两格为一格，下一行就为两格，“数量”，“金额”
HSSFCell cell1 = row2.createCell((short) celle);
HSSFCell cell2 = row2.createCell((short) (celle + 1));
cell1.setEncoding(HSSFCell.ENCODING_UTF_16);
cell1.setCellValue("数量");
cell1.setCellStyle(style);
cell2.setEncoding(HSSFCell.ENCODING_UTF_16);
cell2.setCellValue("金额");
cell2.setCellStyle(style);
num++;
}
// 在后面加上合计百分比
// 合计 在最后加上，还要跨一个单元格
sheet.addMergedRegion(new Region(0, (short) (2 * num + 1), 0,
(short) (2 * num + 2)));
HSSFCell cell = row.createCell((short) (2 * num + 1));
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("合计");
cell.setCellStyle(style);
HSSFCell cell1 = row2.createCell((short) (2 * num + 1));
HSSFCell cell2 = row2.createCell((short) (2 * num + 2));
cell1.setEncoding(HSSFCell.ENCODING_UTF_16);
cell1.setCellValue("数量");
cell1.setCellStyle(style);
cell2.setEncoding(HSSFCell.ENCODING_UTF_16);
cell2.setCellValue("金额");
cell2.setCellStyle(style);
// 百分比 同上
sheet.addMergedRegion(new Region(0, (short) (2 * num + 3), 0,
(short) (2 * num + 4)));
HSSFCell cellb = row.createCell((short) (2 * num + 3));
cellb.setEncoding(HSSFCell.ENCODING_UTF_16);
cellb.setCellValue("百分比");
cellb.setCellStyle(style);
HSSFCell cellb1 = row2.createCell((short) (2 * num + 3));
HSSFCell cellb2 = row2.createCell((short) (2 * num + 4));
cellb1.setEncoding(HSSFCell.ENCODING_UTF_16);
cellb1.setCellValue("数量");
cellb1.setCellStyle(style);
cellb2.setEncoding(HSSFCell.ENCODING_UTF_16);
cellb2.setCellValue("金额");
cellb2.setCellStyle(style);
/***这里是问题的关键，将这个工作簿写入到一个流中就可以输出相应的名字，这里需要写路径就ok了。
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
**/
/**第二种是输出到也面中的excel名称
* pName="栏目统计表";
response.reset();
response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition","attachment; filename="+new String(pName.getBytes("gb2312"),"ISO-8859-1")+".xls");
ServletOutputStream outStream=null;
try{
outStream = response.getOutputStream();
wb.write(outStream);
}catch(Exception e)
{
e.printStackTrace();
}finally{
outStream.close();
}
* */
System.out.print("OK");
} catch (Exception ex) {
ex.printStackTrace();
}
}
/**
* 合并单元格
* @param sheet 要合并单元格的excel 的sheet
* @param cellLine 要合并的列
* @param startRow 要合并列的开始行
* @param endRow 要合并列的结束行
*/
private static void addMergedRegion(HSSFSheet sheet, int cellLine, int startRow, int endRow,HSSFWorkbook workBook){
HSSFCellStyle style = workBook.createCellStyle(); // 样式对象
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 水平
//获取第一行的数据,以便后面进行比较
String s_will = sheet.getRow(startRow).getCell(cellLine).getStringCellValue();
int count = 0;
boolean flag = false;
for (int i = 1; i <= endRow; i++) {
String s_current = sheet.getRow(i).getCell(0).getStringCellValue();
if(s_will.equals(s_current))
{
s_will = s_current;
if(flag)
{
sheet.addMergedRegion(new CellRangeAddress(startRow-count,startRow,cellLine,cellLine));
HSSFRow row = sheet.getRow(startRow-count);
String cellValueTemp = sheet.getRow(startRow-count).getCell(0).getStringCellValue();
HSSFCell cell = row.createCell(0);
cell.setCellValue(cellValueTemp); // 跨单元格显示的数据
cell.setCellStyle(style); // 样式
count = 0;
flag = false;
}
startRow=i;
count++;
}else{
flag = true;
s_will = s_current;
}
//由于上面循环中合并的单元放在有下一次相同单元格的时候做的，所以最后如果几行有相同单元格则要运行下面的合并单元格。
if(i==endRow&&count>0)
{
sheet.addMergedRegion(new CellRangeAddress(endRow-count,endRow,cellLine,cellLine));
String cellValueTemp = sheet.getRow(startRow-count).getCell(0).getStringCellValue();
HSSFRow row = sheet.getRow(startRow-count);
HSSFCell cell = row.createCell(0);
cell.setCellValue(cellValueTemp); // 跨单元格显示的数据
cell.setCellStyle(style); // 样式
}
}
}
}