借助于apathe的poi.jar,由于上传文件不支持.jar所以请下载后将文件改为.jar,在应用程序中添加poi.jar包,并将需要读取的excel文件放入根目录即可

本例使用java来读取excel的内容并展出出结果,代码如下:  

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
 
import org.apache.poi.hssf.usermodel.HSSFCell;
importorg.apache.poi.hssf.usermodel.HSSFDateUtil;
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.poifs.filesystem.POIFSFileSystem;
 
publicclass ExcelOperate {
 
    publicstaticvoid main(String[] args) throws Exception {
       File file = new File("ExcelDemo.xls");
       String[][] result = getData(file, 1);
       int rowLength = result.length;
       for(int i=0;i<rowLength;i++) {
           for(int j=0;j<result[i].length;j++) {
              System.out.print(result[i][j]+"\t\t");
           }
           System.out.println();
       }
       
    }
    /**
     *读取Excel的内容,第一维数组存储的是一行中格列的值,二维数组存储的是多少个行
     *@paramfile读取数据的源Excel
     *@paramignoreRows读取数据忽略的行数,比喻行头不需要读入忽略的行数为1
     *@return读出的Excel中数据的内容
     *@throwsFileNotFoundException
     *@throwsIOException
     */
    publicstatic String[][] getData(File file, int ignoreRows)
           throws FileNotFoundException, IOException {
       List<String[]> result = new ArrayList<String[]>();
       int rowSize = 0;
       BufferedInputStream in = new BufferedInputStream(new FileInputStream(
              file));
       // 打开HSSFWorkbook
       POIFSFileSystem fs = new POIFSFileSystem(in);
       HSSFWorkbook wb = new HSSFWorkbook(fs);
       HSSFCell cell = null;
       for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) {
           HSSFSheet st = wb.getSheetAt(sheetIndex);
           // 第一行为标题,不取
           for (int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++) {
              HSSFRow row = st.getRow(rowIndex);
              if (row == null) {
                  continue;
              }
              int tempRowSize = row.getLastCellNum() + 1;
              if (tempRowSize > rowSize) {
                  rowSize = tempRowSize;
              }
              String[] values = new String[rowSize];
              Arrays.fill(values, "");
              boolean hasValue = false;
              for (short columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++) {
                  String value = "";
                  cell = row.getCell(columnIndex);
                  if (cell != null) {
                      // 注意:一定要设成这个,否则可能会出现乱码
                     cell.setEncoding(HSSFCell.ENCODING_UTF_16);
                     switch (cell.getCellType()) {
                     case HSSFCell.CELL_TYPE_STRING:
                         value = cell.getStringCellValue();
                         break;
                     case HSSFCell.CELL_TYPE_NUMERIC:
                         ifHSSFDateUtil.isCellDateFormatted(cell)) {
                            Date date = cell.getDateCellValue();
                            if (date != null) {
                                 value = new SimpleDateFormat("yyyy-MM-dd")
                                       
                            } else {
                                 value = "";
                            }
                         } else {
                            value = new DecimalFormat("0").format(cell
                                   
                         }
                         break;
                     case HSSFCell.CELL_TYPE_FORMULA:
                         // 导入时如果为公式生成的数据则无值
                         if (!cell.getStringCellValue().equals("")) {
                            value = cell.getStringCellValue();
                         } else {
                            value = cell.getNumericCellValue() + "";
                         }
                         break;
                     case HSSFCell.CELL_TYPE_BLANK:
                         break;
                     case HSSFCell.CELL_TYPE_ERROR:
                         value = "";
                         break;
                     case HSSFCell.CELL_TYPE_BOOLEAN:
                         value = (cell.getBooleanCellValue() == true ? "Y"
                                 : "N");
                         break;
                     default:
                         value = "";
                     }
                  }
                  if (columnIndex == 0 && value.trim().equals("")) {
                     break;
                  }
                  values[columnIndex] = rightTrim(value);
                  hasValue = true;
              }
 
              if (hasValue) {
                  result.add(values);
              }
           }
       }
       in.close();
       String[][] returnArray = new String[result.size()][rowSize];
       for (int i = 0; i < returnArray.length; i++) {
           returnArray[i] = (String[]) result.get(i);
       }
       return returnArray;
    }
    
    /**
     *去掉字符串右边的空格
     *@paramstr要处理的字符串
     *@return处理后的字符串
     */
     publicstatic String rightTrim(String str) {
       if (str == null) {
           return"";
       }
       int length = str.length();
       for (int i = length - 1; i >= 0; i--) {
           if (str.charAt(i) != 0x20) {
              break;
           }
           length--;
       }
       return str.substring(0, length);
    }
}


jsp页面内容导出到Excel中


日常使用网络资源时经常需要把网页中的内容下载到本地,并且导出到Excel中,现在介绍一种非常简单的方式实现网络资源的下载。只需要讲jsp的最上面加上一句话

<%
   response.reset(); 
   response.setContentType("application/vnd.ms-excel;charset=GBK");
%>

就可以将网页的内容导出为Excel。

目前给出的例子为了方便起见,就是使用了纯粹的静态页面,一个table其中有一行是标题,一行是内容,但是实际使用中不可能这么简单,都是保持静态的内容,如果需要保存的内容是从数据库中取出,则只需要循环遍历取出的内容,添加行就行了,假如从数据库中取出的数据存入UserList中,可以使用struts标签进行遍历如下

<table class="common1" cellpadding="5" cellspacing="1" align="center" >
        <tr>
          <td class=formtitle colspan="4"><CENTER>清单</CENTER></td>
        </tr>    
        <tr>
          <td class=formtitle align="center" nowrap style="width:13%">姓名</td>
          <td class=formtitle align="center" nowrap style="width:13%">年龄</td>
          <td class=formtitle align="center" nowrap style="width:13%">性别</td>
          <td class=formtitle align="center" nowrap style="width:13%">住址</td>
        </tr>  
        <logic:present name="UserList">
             <logic:iterate  id="user" name="UserList">
              <tr>
                  <td align="center" nowrap style="width:13%">
                      <bean:write  name = "user",property="name"/>
                  </td>
                  <td align="center" nowrap style="width:13%">
                      <bean:write  name = "user",property="age"/>
                  </td>
                 <td align="center" nowrap style="width:13%">
                 <bean:write  name = "user",property="sex"/>
                 </td>
                 <td align="center" nowrap style="width:13%">
                 <bean:write  name = "user",property="address"/>
                 </td>
               </tr>      
            </logic:iterate>
           </logic:present>
   </table>

下面是完整的例子,新建Dynamic Web Project,在WebContent下新建一个index.jsp,里面只需要一个超链接<a href = 'DownLoadExcel.jsp'>导出Excel</a>

再新建一个DownLoadExcel.jsp,内容如下

<%
   response.reset(); 
   response.setContentType("application/vnd.ms-excel;charset=GBK");
%>
 
<html>
    <head>
        <title>刷卡消费情况</title>
        <style type="text/css">
            table.common1 { width: 100%;
                  font-size: 9pt;
                  style-align: center;
                  background-color: #ffffff;
                 }
                 
            td.formtitle { font-size: 9pt;
              background:#a480b2;
              color:#ffffff;
              height:30px;
              text-align: center;}
</style>
    </head>
    <body>
    <form name="fm" method="post" >
      <table class="common1" cellpadding="5" cellspacing="1" align="center" >
        <tr>
          <td class=formtitle colspan="4"><CENTER>清单</CENTER></td>
        </tr>    
        <tr>
          <td class=formtitle align="center" nowrap style="width:13%">姓名</td>
          <td class=formtitle align="center" nowrap style="width:13%">年龄</td>
          <td class=formtitle align="center" nowrap style="width:13%">性别</td>
          <td class=formtitle align="center" nowrap style="width:13%">家庭住址</td>
        </tr>  
        
         <tr>
         <td align="center" nowrap style="width:13%">张三</td>
             <td align="center" nowrap style="width:13%">25</td>
             <td align="center" nowrap style="width:13%">男</td>
             <td align="center" nowrap style="width:13%">北京中关村</td>
        </tr>       
    
     </table>
        </form>
     </body>
</html>

部署好程序,在index.jsp中点击超链接就可以完成导出了!有更好的方式希望大家能够提出,我们一起学习!