struts1.x的例子,struts2.x可以参考自己修改
1.action的写法
import java.io.*;
import java.sql.*;
import java.util.ArrayList;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.*;
import org.apache.struts.action.*;
import org.apache.struts.upload.FormFile;
import org.apache.commons.beanutils.BeanUtils;
public class Action {
/**//*
* 把数据库中的字段导入到Excel ,并生成Excel文档
**/
public ActionForward getDownload(ActionMapping actionMapping,
ActionForm actionForm, HttpServletRequest request,
HttpServletResponse response) throws Exception {
Form fm = (Form) actionForm;
// Excel 文件存放在服务器的相对路径下
String outputFile = request.getRealPath("/tmp/Excel.xls");
try {
// 创建新的Excel 工作簿
HSSFWorkbook workbook = new HSSFWorkbook();
// 在Excel 工作簿中建一工作表
HSSFSheet sheet = workbook.createSheet("Sheet1");
// 设置单元格格式(文本)
HSSFCellStyle cellStyle = workbook.createCellStyle();
cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("@"));
// 在索引0的位置创建行(第一行)
HSSFRow row = sheet.createRow((short) 0);
HSSFCell cell1 = row.createCell((short) 0);// 第一列
HSSFCell cell2 = row.createCell((short) 1);
HSSFCell cell3 = row.createCell((short) 2);
// 定义单元格为字符串类型
cell1.setCellType(HSSFCell.CELL_TYPE_STRING);
cell2.setCellType(HSSFCell.CELL_TYPE_STRING);
cell3.setCellType(HSSFCell.CELL_TYPE_STRING);
cell1.setEncoding(HSSFCell.ENCODING_UTF_16);
cell2.setEncoding(HSSFCell.ENCODING_UTF_16);
cell3.setEncoding(HSSFCell.ENCODING_UTF_16);
// 在单元格中输入数据
cell1.setCellValue("姓名");
cell2.setCellValue("性别");
cell3.setCellValue("年龄");
Connection connection = session.connection();
String sql = "Select t.name, t.sex, t.age from table t where t.sex = ?";
try {
PreparedStatement ps = connection.prepareStatement(sql);
ps.setString(1, fm.getSex());// 传入查询条件
ResultSet rs = ps.executeQuery();// 查询结果存入rs
connection.commit();// 执行SQL
while (rs.next()) {
//设置j行从第二行开始
int j = 1;
row = sheet.createRow((short) j);
//设置i列从第二列开始
for (int i = 1; i <= 3; i++) {
HSSFCell cell = row.createCell((short) (i-1));
// 设置单元格格式
cell.setCellStyle(cellStyle);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue(rs.getString(i));
}
j++;
}
request.setAttribute("message", "文件生成成功!");
} catch (SQLException e) {
request.setAttribute("message", "创建文件失败!");
e.printStackTrace();
}
// 删除路径下同名的Excel 文件
File path = new File(outputFile);
path.delete();
// 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);
// 操作结束,关闭文件
fOut.flush();
fOut.close();
//该处如果Excel过大会影响效率,谁有好的想法可以提出来参考(不过从页面下载完后就会清空)
request.getSession().setAttribute("Download", outputFile);
} catch (Exception ioexception) {
request.setAttribute("message", "创建文件失败!");
return actionMapping.findForward("outJSP");
}
return actionMapping.findForward("outJSP");
}
/**//*
* 从Excel文件中读取数据,并导入到数据库中
**/
public ActionForward getUpload(ActionMapping actionMapping,
ActionForm actionForm, HttpServletRequest request,
HttpServletResponse response) throws Exception {
// 获取excel 文件
Form fm = (Form) actionForm;
FormFile formfile = fm.getUploadfile();
InputStream inputstream = formfile.getInputStream();
fm.clear();// 清空
Session session = HibernateSession.currentSession();
ArrayList list = new ArrayList();
int input = 0; //导入记数
String name = null;
String sex = null;
String age = null;
try {
//通过得到的文件输入流inputstream创建一个HSSFWordbook对象
HSSFWorkbook hssfworkbook = new HSSFWorkbook(inputstream);
HSSFSheet hssfsheet = hssfworkbook.getSheetAt(0);//第一个工作表
HSSFRow hssfrow = hssfsheet.getRow(0);//第一行
//遍历该表格中所有的工作表,i表示工作表的数量 getNumberOfSheets表示工作表的总数
for (int i = 0; i < hssfworkbook.getNumberOfSheets(); i++) {
hssfsheet = hssfworkbook.getSheetAt(i);
//遍历该行所有的行,j表示行数 getPhysicalNumberOfRows行的总数
for (intfont-size: 10pt; color
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