使用Struts1从数据库下载，打印exsl表格
1、建立实体类
package Exsl;
import java.util.Date;
import org.apache.struts.action.ActionForm;
public class ARCHIVE extends ActionForm{
int ARCHIVE_ID;
int ARCHIVE_YEAR;
String ARCHIVE_TITLE;
String ARCHIVE_MARK;
Date START_DATE;
public int getARCHIVE_ID() {
return ARCHIVE_ID;
}
public void setARCHIVE_ID(int aRCHIVE_ID) {
ARCHIVE_ID = aRCHIVE_ID;
}
public int getARCHIVE_YEAR() {
return ARCHIVE_YEAR;
}
public void setARCHIVE_YEAR(int aRCHIVE_YEAR) {
ARCHIVE_YEAR = aRCHIVE_YEAR;
}
public String getARCHIVE_TITLE() {
return ARCHIVE_TITLE;
}
public void setARCHIVE_TITLE(String aRCHIVE_TITLE) {
ARCHIVE_TITLE = aRCHIVE_TITLE;
}
public String getARCHIVE_MARK() {
return ARCHIVE_MARK;
}
public void setARCHIVE_MARK(String aRCHIVE_MARK) {
ARCHIVE_MARK = aRCHIVE_MARK;
}
public Date getSTART_DATE() {
return START_DATE;
}
public void setSTART_DATE(Date sTART_DATE) {
START_DATE = sTART_DATE;
}
}
2、写入action ---ExslAtion
package Exsl;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
public class ExslAtion extends DispatchAction {
public void getexsl(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws Exception{
ExslServlet exsl = new ExslServlet();
exsl.getarchive(response);
}
}
3、从数据库查询数据语句 ExslServlet
package Exsl;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.jstl.sql.Result;
import com.cn.servlet.BaseDAO;
public class ExslServlet {
public boolean getarchive(HttpServletResponse response) throws Exception{
String sql = "select * from ARCHIVE";
Result result = BaseDAO.runSelectSql(sql);
List lists = new ArrayList();
Map[] rows = result.getRows();
String[] title={"序号","备注","页数","备注","日期"};
for(Map row:rows){
List list=new ArrayList();
list.add(row.get("ARCHIVE_ID"));
list.add(row.get("ARCHIVE_YEAR"));
list.add(row.get("ARCHIVE_MARK"));
list.add(row.get("ARCHIVE_TITLE"));
list.add(row.get("START_DATE"));
lists.add(list);
}
new OutExcel().outExcel(response,title,lists);
return false;
}
}
4、至关重要的一点就是写入下载exsl表格的封印方法
package Exsl;
import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
//打出excel表格OutExcel
public class OutExcel {
public boolean outExcel(HttpServletResponse response,String[] title,List lists){
Date date=new Date();
SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMddHHmmss");
String fileName=sdf.format(date);
File f=new File("D://"+fileName+".xls");
try{
f.createNewFile();
Excel.writeExcel(new FileOutputStream(f),title,lists);
Files.exportFile(response, f, true);
return true;
}catch(Exception e){
e.printStackTrace();
return false;
}
}
}
5、封印打印exsl的方法里调用了两个方法 Excel和exportFile
package Exsl;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;
public class Excel {
public static void writeExcel(OutputStream os, String[] title, List lists) throws IOException, RowsExceededException, WriteException {
// 创建可以写入的Excel工作�?默认运行生成的文件在tomcat/bin�?)
WritableWorkbook wwb = Workbook.createWorkbook(os);
// 生成工作�?(name:First Sheet,参数0表示这是第一�?
WritableSheet sheet = wwb.createSheet("First Sheet", 0);
// �?��写入第一�?即标题栏)
for (int i=0; i<title.length; i++) {
// 用于写入文本内容到工作表中去
Label label = null;
// 在Label对象的构造中指明单元格位�?参数依次代表列数、行数�?内容 )
label = new Label(i, 0, title[i]);
// 将定义好的单元格添加到工作表�?
sheet.addCell(label);
}
// �?��写入内容
for (int row=0; row<lists.size(); row++) {
// 获取�?��(�?��)记录
List list = (List) lists.get(row);
// 数据是文本时(用label写入到工作表�?
for (int col=0; col<list.size(); col++) {
String listvalue = (String) list.get(col).toString();
Label label = null;
label = new Label(col, row+1, listvalue);
sheet.addCell(label);
}
}
/*
生成�?��保存数字的单元格,必须使用Number的完整包路径,否则有语法歧�?值为789.123
jxl.write.Number number = new jxl.write.Number(col, row, 555.12541);
sheet.addCell(number);
*/
/*
生成�?��保存日期的单元格,必须使用DateTime的完整包路径,否则有语法歧�?值为new Date()
jxl.write.DateTime date = new jxl.write.DateTime(col, row, new java.util.Date());
sheet.addCell(date);
*/
// 写入数据
wwb.write();
// 关闭文件
wwb.close();
// 关闭输出�?
os.close();
}
}
package Exsl;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletResponse;
public class Files {
public static void exportFile(HttpServletResponse response, File file, boolean isDel) throws IOException {
OutputStream out = null;
InputStream in = null;
// 获得文件�?
String filename = URLEncoder.encode(file.getName(), "UTF-8");
// 定义输出类型(下载)
response.setContentType("application/force-download");
response.setHeader("Location", filename);
// 定义输出文件�?
response.setHeader("Content-Disposition", "attachment;filename=" + filename);
out = response.getOutputStream();
in = new FileInputStream(file.getPath());
byte[] buffer = new byte[1024];
int i = -1;
while ((i = in.read(buffer)) != -1) {
out.write(buffer, 0, i);
}
in.close();
out.close();
if (isDel) {
//删除文件,删除前关闭所有的Stream.
file.delete();
}
}
}
6、配置Struts的文件
7、写JSP
<a href="exsl.do?method=getexsl">打印表格</a>
8、即可从数据库里打印出exsl表格，如图