JAVA及jsp下导出Excel表格
本篇文章就举例示范如何利用Java 创建和读取Excel文档，并设置单元格的字体和格式。为了保证示例程序的运行，必须安装Java 2 sdk1.4.0 和Jakarta POI，Jakarta POI的Web站点是: http://jakarta.apache.org/poi/
第一：创建Excel 文档
示例1将演示如何利用Jakarta POI API 创建Excel 文档。
示例1程序如下：
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFCell;
import java.io.FileOutputStream;
public class CreateXL {
/** Excel 文件要存放的位置，假定在D盘JTest目录下*/
public static String outputFile="D:/JTest/ gongye.xls";
public static void main(String argv[]){
try{
// 创建新的Excel 工作簿
HSSFWorkbook workbook = new HSSFWorkbook();
// 在Excel工作簿中建一工作表，其名为缺省值
// 如要新建一名为"效益指标"的工作表，其语句为：
// HSSFSheet sheet = workbook.createSheet("效益指标");
HSSFSheet sheet = workbook.createSheet();
// 在索引0的位置创建行（最顶端的行）
HSSFRow row = sheet.createRow((short)0);
//在索引0的位置创建单元格（左上端）
HSSFCell cell = row.createCell((short) 0);
// 定义单元格为字符串类型
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
// 在单元格中输入一些内容
cell.setCellValue("增加值");
// 新建一输出文件流
FileOutputStream fOut = new FileOutputStream(outputFile);
// 把相应的Excel 工作簿存盘
workbook.write(fOut);
fOut.flush();
// 操作结束，关闭文件
fOut.close();
System.out.println("文件生成...");
}catch(Exception e) {
System.out.println("已运行 xlCreate() : " + e );
}
}
}
第二：读取Excel文档中的数据
示例2将演示如何读取Excel文档中的数据。假定在D盘JTest目录下有一个文件名为gongye.xls的Excel文件。
示例2程序如下：
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFCell;
import java.io.FileInputStream;
public class ReadXL {
/** Excel文件的存放位置。注意是正斜线*/
public static String fileToBeRead="D:/JTest/ gongye.xls";
public static void main(String argv[]){
try{
// 创建对Excel工作簿文件的引用
HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(fileToBeRead));
// 创建对工作表的引用。
// 本例是按名引用（让我们假定那张表有着缺省名"Sheet1"）
HSSFSheet sheet = workbook.getSheet("Sheet1");
// 也可用getSheetAt(int index)按索引引用，
// 在Excel文档中，第一张工作表的缺省索引是0，
// 其语句为：HSSFSheet sheet = workbook.getSheetAt(0);
// 读取左上端单元
HSSFRow row = sheet.getRow(0);
HSSFCell cell = row.getCell((short)0);
// 输出单元内容，cell.getStringCellValue()就是取所在单元的值
System.out.println("左上端单元是： " + cell.getStringCellValue());
}catch(Exception e) {
System.out.println("已运行xlRead() : " + e );
}
}
}
第三： 设置单元格格式
在这里，我们将只介绍一些和格式设置有关的语句，我们假定workbook就是对一个工作簿的引用。在Java中，第一步要做的就是创建和设置字体和单元格的格式，然后再应用这些格式：
1、创建字体，设置其为红色、粗体：
HSSFFont font = workbook.createFont();
font.setColor(HSSFFont.COLOR_RED);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
2、创建格式
HSSFCellStyle cellStyle= workbook.createCellStyle();
cellStyle.setFont(font);
3、应用格式
HSSFCell cell = row.createCell((short) 0);
cell.setCellStyle(cellStyle);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue("标题 ");
第四： 小例子
1.最简单的实现，可以让你一下就看到效果
<%@ page contentType="application/msexcel" %><!-- 以上这行设定本网页为excel格式的网页 --><% response.setHeader("Content-disposition","inline; filename=test1.xls"); //以上这行设定传送到前端浏览器时的档名为test1.xls //就是靠这一行，让前端浏览器以为接收到一个excel档%><html><head><title>Excel档案呈现方式</title></head><body><table border="1" width="100%"> <tr> <td>姓名</td><td>身份证字号</td><td>生日</td> </tr> <tr> <td>李玟</td><td>N111111111</td><td>1900/11/12</td> </tr> <tr> <td>梁静如</td><td>N222222222</td><td>1923/10/1</td> </tr> <tr> <td>张惠妹</td><td>N333333333</td><td>1934/12/18</td> </tr></table></body></html>
2.第二种，在页面可以写入数据
<%@ page import="org.apache.poi.hssf.usermodel.HSSFCell" %><%@ page import="org.apache.poi.hssf.usermodel.HSSFRow" %><%@ page import="org.apache.poi.hssf.usermodel.HSSFSheet" %><%@ page import="org.apache.poi.hssf.usermodel.HSSFWorkbook" %><%@ page import="java.util.List" %><% //这是我获取我们系统种的数据，上面的代码我删掉了，只要得到一个List就可以了 List userList = (List) ret.getObject("users"); String filename = ""; filename = "activeUserList.xls"; String[] tableHeader = {"userName", "registTime", "lastLoginTime"}; response.setContentType("APPLICATION/OCTET-STREAM "); response.setContentType("application/x-msdownload;charset=utf-8"); response.setCharacterEncoding("utf-8"); response.setHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes("GBK"), "ISO8859_1")); HSSFWorkbook wb = new HSSFWorkbook(); HSSFSheet sheet = wb.createSheet(); wb.setSheetName(0, "userList", HSSFWorkbook.ENCODING_UTF_16); // 表头为第一行 HSSFRow headerRow = sheet.createRow(0); for (int i = 0; i < tableHeader.length; i++) { HSSFCell headerCell = headerRow.createCell((short) i); headerCell.setEncoding(HSSFCell.ENCODING_UTF_16); headerCell.setCellValue(tableHeader); } UserVo user; HSSFRow row; HSSFCell cell; if (userList != null) { for (int i = 0; i < userList.size(); i++) { user = (UserVo) userList.get(i); row = sheet.createRow(i + 1); cell = row.createCell((short) 0);// cell.setEncoding(HSSFCell.ENCODING_UTF_16); cell.setCellValue(user.getName()); cell = row.createCell((short) 1); cell.setCellValue(user.getRegistTime().toString()); cell = row.createCell((short) 2); cell.setCellValue(user.getLastLoginTime().toString()); } } wb.write(response.getOutputStream()); response.getOutputStream().flush(); response.getOutputStream().close();%> Java生成代码编写
1。
public ActionForward toExcelModif(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response) {try {String title = "员工号,员工姓名,金额,结束日期";String records = new String();records = "";String records2 = new String();records2 = "";int ai = 0;// 输出ExcelHttpSession s = request.getSession(false);Employee emp = (Employee) s.getAttribute(Constants.USER_IN_SESSION);String str1=System.getProperty("user.dir");String str2=System.getProperty("file.separator");String strf = str1+str2+ emp.getEmpEname()+ "_output.xls";File file = new File(str1+str2);if (!file.exists()) {file.mkdirs();}File fileWrite = new File(strf);fileWrite.createNewFile();OutputStream os = new FileOutputStream(fileWrite);HashMap<String, Object> map2 = new HashMap<String, Object>();String reviewBatchNo =request.getParameter("reviewBatchNo2");map2.put("reviewBatchNo", reviewBatchNo.trim());List<PteExpenditures> list2 = expendituresService.findExpenditures(map2);if (list2!=null){Iterator<PteExpenditures> ite = list2.iterator();while (ite.hasNext()) {PteExpenditures pteExpenditures = ite.next();records2 = records2+ pteExpenditures.getEmpNo()+ ","+ pteExpenditures.getEmpName()+ ","+ pteExpenditures.getTotalAmount()+ pteExpenditures.getVerifyEmpName()+ ","+ pteExpenditures.getAcceptEmpName()+ ",";ai++;}}if (!records2.equals("")) {records = records + records2;}ExcelHandle eh = new ExcelHandle();SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String strDate = formatter.format(new Date());String remark = "复核批号：," + reviewBatchNo.trim()+ ",总份数：," + ai;DecimalFormat s1 = new DecimalFormat( ".00"); String rmbstr= s1.format(rmb) ;String usdstr= s1.format(usd) ;String gbstr= s1.format(gb) ;remark = remark + ",人民币金额：," +rmbstr+ ",美元金额：," +usdstr + ",港币金额：," +gbstr+",打印日期：," + strDate;writeExcel_add(os, title,records, remark);} catch (Exception e) {e.printStackTrace();}download(mapping, form, request, response);return null;} 2。
public void writeExcel_add(OutputStream os, String title, String records,String remark) {try {WritableWorkbook wwb = Workbook.createWorkbook(os);WritableSheet ws = wwb.createSheet("TestCreateExcel",0);WritableFont titleFont = new WritableFont(WritableFont.ARIAL, 12,WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.BLACK);WritableCellFormat titleFormat = new WritableCellFormat(titleFont);WritableFont detFont = new WritableFont(WritableFont.ARIAL, 10,WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.BLACK);WritableCellFormat detFormat = new WritableCellFormat(detFont);String Title[] = title.split(",");int n = Title.length;for (int i = 0; i < n; i++) {Label label = new Label(i, 0, Title, titleFormat);ws.setColumnView(i, 12);ws.addCell(label);}String Records[] = records.split(",");int r = 0, l = 0;for (int i = 0; i < Records.length; i++) {if (l % n == 0) {r++;l = 0;}// ����Label label = new Label(l, r, Records, detFormat);l++;ws.addCell(label);}r++;String Remarks[] = remark.split(",");for (int i = 0; i < Remarks.length; i++) {if (l % n == 0) {r++;l = 0;}// ����Label label = new Label(l, r, Remarks, detFormat);l++;ws.addCell(label);}wwb.write();wwb.close();} catch (Exception e) {e.printStackTrace();}}
3。
public static void download(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response) {java.io.BufferedInputStream bis = null;java.io.BufferedOutputStream bos = null;try {response.setCharacterEncoding("UTF-8");response.setContentType("application/x-msdownload");response.setHeader("Content-disposition", "attachment; filename="+ "exceltest.xls");HttpSession s = request.getSession(false);Employee emp = (Employee) s.getAttribute(Constants.USER_IN_SESSION);String str1=System.getProperty("user.dir");String str2=System.getProperty("file.separator");String strf = str1+str2+ emp.getEmpEname()+ "_output.xls";bis = new java.io.BufferedInputStream(new java.io.FileInputStream(strf));bos = new java.io.BufferedOutputStream(response.getOutputStream());byte[] buff = new byte;int bytesRead;while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {bos.write(buff, 0, bytesRead);}bos.flush();} catch (Exception e) {e.printStackTrace();} finally {if (bis != null) {try {bis.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}bis = null;}if (bos != null) {try {bos.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}bos = null;}}}
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