java合并单元格同时导出excel

POI进行跨行需要用到对象HSSFSheet对象，现在就当我们程序已经定义了一个HSSFSheet对象sheet。 

跨第1行第1个到第2个单元格的操作为 
sheet.addMergedRegion(new Region(0,(short)0,0,(short)1)); 

跨第1行第1个到第2行第1个单元格的操作为 
sheet.addMergedRegion(new Region(0,(short)0,1,(short)0)); 


重点注意事项： 
1.单元格CELL和ROW对象下标都是从0开始的。 
2.单元格合并时Region(1,2,3,4)第1个值的行号必须要比3位置的行号小，如果大于3就不能正常合并单元格 
3.合并单元格的时候要合并的单单元格必须先创建，这样方便后面再次获取这个单元格来填充数据，主要就是因为合并时不能由后向前进行合并引起的。 

Java代码  

1. import java.io.IOException;  
2.   
3. import org.apache.poi.hssf.usermodel.HSSFCell;  
4. import org.apache.poi.hssf.usermodel.HSSFCellStyle;  
5. import org.apache.poi.hssf.usermodel.HSSFRow;  
6. import org.apache.poi.hssf.usermodel.HSSFSheet;  
7. import org.apache.poi.hssf.usermodel.HSSFWorkbook;  
8. import org.apache.poi.hssf.util.Region;  
9.   
10.   
11. public class ExcelTest {      
12.      
13.     /**    
14.      * @param args    
15.      */     
16.     public static void main(String[] args) throws IOException {      
17.      
18.         try {      
19.             HSSFWorkbook wb = new HSSFWorkbook();      
20.             HSSFSheet sheet = wb.createSheet("new   sheet");      
21.             HSSFCellStyle style = wb.createCellStyle(); // 样式对象      
22.      
23.             style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直      
24.             style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 水平      
25.             HSSFRow row = sheet.createRow((short) 0);      
26.             HSSFRow row2 = sheet.createRow((short) 1);      
27.      
28.             sheet.addMergedRegion(new Region(0, (short) 0, 1, (short) 0));      
29.             HSSFCell ce = row.createCell((short) 0);      
30.             ce.setEncoding(HSSFCell.ENCODING_UTF_16);// 中文处理      
31.             ce.setCellValue("项目\\日期"); // 表格的第一行第一列显示的数据      
32.             ce.setCellStyle(style); // 样式，居中      
33.             int num = 0;      
34.             for (int i = 0; i < 9; i++) { // 循环9次，每一次都要跨单元格显示      
35.                 // 计算从那个单元格跨到那一格      
36.                 int celln = 0;      
37.                 int celle = 0;      
38.                 if (i == 0) {      
39.                     celln = 0;      
40.                     celle = 1;      
41.                 } else {      
42.                     celln = (i * 2);      
43.                     celle = (i * 2 + 1);      
44.                 }      
45.                 // 单元格合并      
46.                 // 四个参数分别是：起始行，起始列，结束行，结束列      
47.                 sheet.addMergedRegion(new Region(0, (short) (celln + 1), 0,      
48.                         (short) (celle + 1)));      
49.                 HSSFCell cell = row.createCell((short) (celln + 1));      
50.                 cell.setCellValue("merging" + i); // 跨单元格显示的数据      
51.                 cell.setCellStyle(style); // 样式      
52.                 // 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”      
53.                 HSSFCell cell1 = row2.createCell((short) celle);      
54.                 HSSFCell cell2 = row2.createCell((short) (celle + 1));      
55.                 cell1.setEncoding(HSSFCell.ENCODING_UTF_16);      
56.                 cell1.setCellValue("数量");      
57.                 cell1.setCellStyle(style);      
58.                 cell2.setEncoding(HSSFCell.ENCODING_UTF_16);      
59.                 cell2.setCellValue("金额");      
60.                 cell2.setCellStyle(style);      
61.                 num++;      
62.             }      
63.      
64.             // 在后面加上合计百分比      
65.      
66.             // 合计 在最后加上，还要跨一个单元格      
67.             sheet.addMergedRegion(new Region(0, (short) (2 * num + 1), 0,      
68.                     (short) (2 * num + 2)));      
69.             HSSFCell cell = row.createCell((short) (2 * num + 1));      
70.             cell.setEncoding(HSSFCell.ENCODING_UTF_16);      
71.             cell.setCellValue("合计");      
72.             cell.setCellStyle(style);      
73.             HSSFCell cell1 = row2.createCell((short) (2 * num + 1));      
74.             HSSFCell cell2 = row2.createCell((short) (2 * num + 2));      
75.             cell1.setEncoding(HSSFCell.ENCODING_UTF_16);      
76.             cell1.setCellValue("数量");      
77.             cell1.setCellStyle(style);      
78.             cell2.setEncoding(HSSFCell.ENCODING_UTF_16);      
79.             cell2.setCellValue("金额");      
80.             cell2.setCellStyle(style);      
81.      
82.             // 百分比 同上      
83.             sheet.addMergedRegion(new Region(0, (short) (2 * num + 3), 0,      
84.                     (short) (2 * num + 4)));      
85.             HSSFCell cellb = row.createCell((short) (2 * num + 3));      
86.             cellb.setEncoding(HSSFCell.ENCODING_UTF_16);      
87.              
88.             cellb.setCellValue("百分比");      
89.             cellb.setCellStyle(style);      
90.               
91.             HSSFCell cellb1 = row2.createCell((short) (2 * num + 3));      
92.             HSSFCell cellb2 = row2.createCell((short) (2 * num + 4));      
93.             cellb1.setEncoding(HSSFCell.ENCODING_UTF_16);      
94.             cellb1.setCellValue("数量");      
95.             cellb1.setCellStyle(style);      
96.             cellb2.setEncoding(HSSFCell.ENCODING_UTF_16);      
97.             cellb2.setCellValue("金额");      
98.             cellb2.setCellStyle(style);      
99.      
100.             /***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。 
101.             FileOutputStream fileOut = new FileOutputStream("workbook.xls");     
102.             wb.write(fileOut);     
103.             fileOut.close(); 
104.              **/  
105.               
106.               
107.             /**第二种是输出到也面中的excel名称 
108.              * pName="栏目统计表";    
109.     response.reset();    
110.     response.setContentType("application/x-msdownload");    
111.     response.setHeader("Content-Disposition","attachment; filename="+new String(pName.getBytes("gb2312"),"ISO-8859-1")+".xls");    
112.     ServletOutputStream outStream=null;    
113.    
114.     try{    
115.         outStream = response.getOutputStream();    
116.         wb.write(outStream);    
117.     }catch(Exception e)    
118.     {    
119.      e.printStackTrace();    
120.     }finally{    
121.         outStream.close();    
122.     }    
123.              * */  
124.             System.out.print("OK");      
125.         } catch (Exception ex) {      
126.             ex.printStackTrace();      
127.         }      
128.      
129.     }      
130.      
131. }    

java合并单元格同时导出excel

原文：http://www.cnblogs.com/langtianya/p/6345012.html