Java读取Excel内容&jsp页面内容导出到Excel中

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:

                         if (HSSFDateUtil.isCellDateFormatted(cell)) {

                            Date date = cell.getDateCellValue();

                            if (date !=null) {

                                value = new SimpleDateFormat("yyyy-MM-dd")

                                       .format(date);

                            } else {

                                value = "";

                            }

                         } else {

                            value =new DecimalFormat("0").format(cell

                                   .getNumericCellValue());

                         }

                         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：

<tableclass="common1"cellpadding="5"cellspacing="1"align="center">

        <tr>

          <tdclass=formtitlecolspan="4"><CENTER>清单</CENTER></td>

        </tr>   

        <tr>

          <tdclass=formtitlealign="center"nowrap style="width:13%">姓名</td>

          <tdclass=formtitlealign="center"nowrap style="width:13%">年龄</td>

          <tdclass=formtitlealign="center"nowrap style="width:13%">性别</td>

          <tdclass=formtitlealign="center"nowrap style="width:13%">住址</td>

        </tr> 

        <logic:presentname="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<ahref = '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>

        <styletype="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>

    <formname="fm"method="post">

      <tableclass="common1"cellpadding="5"cellspacing="1"align="center">

        <tr>

          <tdclass=formtitlecolspan="4"><CENTER>清单</CENTER></td>

        </tr>   

        <tr>

          <tdclass=formtitlealign="center"nowrap style="width:13%">姓名</td>

          <tdclass=formtitlealign="center"nowrap style="width:13%">年龄</td>

          <tdclass=formtitlealign="center"nowrap style="width:13%">性别</td>

          <tdclass=formtitlealign="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！