poi读取excel并输出到jsp页面
代码来源于网络，只做了部分修改，我也是刚用到很多都不懂，找了一些例子之类的自己用，有些不错的分享给大家，仅供参考。
下面这个是用servlet做(注意web.xml )；其实原理一样；源码如下
readExcelServlet.java
package com.test.servlet;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import https://www.wendangku.net/doc/286190405.html,ermodel.HSSFCell;
import https://www.wendangku.net/doc/286190405.html,ermodel.HSSFDateUtil;
import https://www.wendangku.net/doc/286190405.html,ermodel.HSSFRow;
import https://www.wendangku.net/doc/286190405.html,ermodel.HSSFSheet;
import https://www.wendangku.net/doc/286190405.html,ermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
/**
* author:wx * describe:Reads the Excel example *
*/
public class readExcelServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* * Constructor of the object.
*/
public readExcelServlet() {
super();
}
/**
* Destruction of the servlet.
*
*/
public void destroy() {
super.destroy();
}// Just puts "destroy" string in log
// Put your code here
/**
* doGet
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* doPost
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=gb2312");
PrintWriter out = response.getWriter();
String filePath = new String(request.getParameter("file").getBytes(
"GBK"), "gb2312");//注意如果这里出现乱码导致文件路径错误试着改下GBK，换成ISO-8859-1
out.print("文件路径：" + filePath + "
");
try {
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(
filePath));
// 创建工作簿
HSSFWorkbook workBook = new HSSFWorkbook(fs);
/**
* 获得Excel中工作表个数
*/
out.println("工作表个数 :" + workBook.getNumberOfSheets() + "
");
for (int i = 0; i < workBook.getNumberOfSheets(); i++) {
out.println(" " + i
+ " ***************工作表名称："+ workBook.getSheetName(i)
+ " ************
");
// 创建工作表
HSSFSheet sheet = workBook.getSheetAt(i);
int rows = sheet.getPhysicalNumberOfRows(); // 获得行数
if (rows > 0) {
sheet.getMargin(HSSFSheet.TopMargin);
for (int j = 0; j < rows; j++) { // 行循环
HSSFRow row = sheet.getRow(j);
if (row != null) {
int cells = row.getLastCellNum();// 获得列数
for (short k = 0; k < cells; k++) { // 列循环
HSSFCell cell = row.getCell(k);
if (cell != null) {
String value = "";
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC:
if (HSSFDateUtil
.isCellDateFormatted(cell)) {
// 如果是date类型则，获取该cell的date值
value = HSSFDateUtil.getJavaDate(
cell.getNumericCellValue())
.toString();
out.println("第"+ j + "行,第" + k
+ "列值：" + value + "
");
} else {// 纯数字
value = String.valueOf(cell
.getNumericCellValue());
out.println("第"+ j + "行,第" + k
+ "列值：" + value + "
");
}
break;
/* 此行表示单元格的内容为string类型*/
case HSSFCell.CELL_TYPE_STRING: // 字符串型
value = cell.getRichStringCellValue()
.toString();
out.println("第" + j + "行,第" + k + "列值："
+ value + "
");
break;
case
HSSFCell.CELL_TYPE_FORMULA:// 公式型
// 读公式计算值
value = String.valueOf(cell .getNumericCellValue());
if(value.equals("NaN")) {// 如果获取的数据值为非法值,则转换为获取字符串
//
value = cell .getRichStringCellValue()
.toString();
}
// cell.getCellFormula();读公
式
out.println("第" + j + "行,第" + k + "列值："
+ value + "
");
break;
case
HSSFCell.CELL_TYPE_BOOLEAN:// 布尔
value = " "
+
cell.getBooleanCellValue();
out.println("第" + j + "行,第" + k + "列值："
+ value + "
");
break;
/* 此行表示该单元格值为空 */
case HSSFCell.CELL_TYPE_BLANK: // 空值
value = "";
out.println("第" + j + "行,第" + k + "列值："
+ value + "
");
break;
case HSSFCell.CELL_TYPE_ERROR: // 故障
value = "";
out.println("第" + j + "行,第" + k + "列值："
+ value + "
");
break;
default:
value = cell.getRichStringCellValue()
.toString();
out.println("第" + j + "行,第" + k + "列值："
+ value + "
");
}
}
}
}
}
}
}
} catch (Exception ex) {
ex.printStackTrace();
}
out.print("");
out.flush();
out.close();
}
public void init() throws ServletException {
// Put your code here
}
}
下面是jsp页面；
readExcel.jsp
<%@page language="java"import="java.util.*"pageEncoding="gb2312"%> <%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>