Q1：下载图片，文档
--1：Fileio.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<p>
<a href="Download?filename=images/猴哥.jpg">下载猴哥0</a><br /> <a
href="Download?filename=images/pic(10).jpg">下载图片1</a><br /> <a
href="Download?filename=images/pic(11).jpg">下载图片2</a><br /> <a
href="Download?filename=images/pic(12).jpg">下载图片3</a>
</p>
<p>
<a href="Download?filename=LICENSE.txt">下载文本</a>
</p>
</body>
</html>
-2:servlet(Download)
package com.action;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/Download")
public class Download extends HttpServlet {
private static final long serialVersionUID = 1L;
public Download() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String filename = request.getParameter("filename");
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
//获得要下载的文件路径
String path=getServletContext().getRealPath(filename);
System.out.println(path);
//获得文件名
//H:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\AjaxResult\images\12.jpg
String name=path.substring(path.lastIndexOf("\\")+1);
//转码
name=URLEncoder.encode(name,"utf-8");
//修改http头部，设置输出为附件
response.setHeader("Content-Disposition", "attachment;filename="+name);
//输入流，获得文件的字节流
InputStream is=new FileInputStream(path);
byte[] bytes=new byte[is.available()];
is.read(bytes);
//将字节流写入response中
response.getOutputStream().write(bytes);
is.close();
response.flushBuffer();
response.getOutputStream().flush();
}
}
--点击下载时
提示：本文的最后会有java编译器图片附上
Q2：Excel导出的第一种方式，也是比较简单的一种方式
1.html用上面的就好，只是加了一点代码
<P>
<a href="DownloadXLS">导出xls</a>
</P>
2:servlet(DownloadXLS)--此方法用于不连接数据库操作
package com.action;
import java.io.IOException;
import java.net.URLEncoder;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/DownloadXLS")
public class DownloadXLS extends HttpServlet {
private static final long serialVersionUID = 1L;
public DownloadXLS() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String filename = request.getParameter("filename");
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
// 写入bom头
byte[] uft8bom={(byte)0xef,(byte)0xbb,(byte)0xbf};
String name=URLEncoder.encode("月度收入报表.csv","utf-8");
//修改http头部，设置输出为附件
response.setHeader("Content-Disposition", "attachment;filename="+name);
String result="日期,收入\r\n";
for (int i = 1; i <=10; i++) {
result+="2018-06-"+i+","+(i*10)+"万\r\n";
}
result=new String(result.getBytes(),"utf-8");
//将字节流写入response中
response.getOutputStream().write(uft8bom); //写入头部解决乱码问题
response.getOutputStream().write(result.getBytes("utf-8"));
response.flushBuffer();
response.getOutputStream().flush();
}
}
3:servlet(DownloadXLS)--此方法用于连接数据库操作
package com.action;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.bos.Menuboimpl;
import com.vos.Menu;
@WebServlet("/DownloadXLS")
public class DownloadXLS extends HttpServlet {
private static final long serialVersionUID = 1L;
public DownloadXLS() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String filename = request.getParameter("filename");
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
response.setContentType("application/vnd.ms-excel");//此处我是用了火狐浏览器，这句话非常重要,下面会有介绍
// 写入bom头
byte[] uft8bom={(byte)0xef,(byte)0xbb,(byte)0xbf};
String name=URLEncoder.encode("月度收入报表.csv","utf-8");
//修改http头部，设置输出为附件
response.setHeader("Content-Disposition", "attachment;filename="+name);
String result="编号,类型,名称,价格,状态,折扣,日期\r\n";
Menuboimpl mi=new Menuboimpl();
int mmtid=Integer.parseInt(request.getParameter("mmtid"));
System.out.println(mmtid);
//int mmtid=1;
List<Menu> list=null;
if(mmtid==0) {
list=mi.getMenuAllListAll();
}else {
list=mi.getMenuAllList(mmtid);
}
for(Menu item:list) {
result+=item.getMid()+","+item.getMmtid()+","+item.getMname()+","+item.getMprice()+","+
item.getStatus()+","+item.getMdiscount()+","+item.getMdate()+"\r\n";
}
result=new String(result.getBytes("utf-8"),"utf-8");
//将字节流写入response中
response.getOutputStream().write(uft8bom); //写入头部解决乱码问题
response.getOutputStream().write(result.getBytes("utf-8"));
response.flushBuffer();
response.getOutputStream().flush();
}
}
获取数据的来源大家应该都会了
上面的那句话不同浏览器可能会有不同
按照内容类型排列的 Mime 类型列表
| 类型/子类型 | 扩展名 |
|---|---|
| application/envoy | evy |
| application/fractals | fif |
| application/futuresplash | spl |
| application/hta | hta |
| application/internet-property-stream | acx |
| application/mac-binhex40 | hqx |
| application/msword | doc |
| application/msword | dot |
| application/octet-stream | * |
| application/octet-stream | bin |
| application/octet-stream | class |
| application/octet-stream | dms |
| application/octet-stream | exe |
| application/octet-stream | lha |
| application/octet-stream | lzh |
| application/oda | oda |
| application/olescript | axs |
| application/pdf | |
| application/pics-rules | prf |
| application/pkcs10 | p10 |
| application/pkix-crl | crl |
| application/postscript | ai |
| application/postscript | eps |
| application/postscript | ps |
| application/rtf | rtf |
| application/set-payment-initiation | setpay |
| application/set-registration-initiation | setreg |
| application/vnd.ms-excel | xla |
| application/vnd.ms-excel | xlc |
| application/vnd.ms-excel | xlm |
| application/vnd.ms-excel | xls |
| application/vnd.ms-excel | xlt |
| application/vnd.ms-excel | xlw |
| application/vnd.ms-outlook | msg |
| application/vnd.ms-pkicertstore | sst |
| application/vnd.ms-pkiseccat | cat |
| application/vnd.ms-pkistl | stl |
| application/vnd.ms-powerpoint | pot |
| application/vnd.ms-powerpoint | pps |
| application/vnd.ms-powerpoint | ppt |
| application/vnd.ms-project | mpp |
| application/vnd.ms-works | wcm |
| application/vnd.ms-works | wdb |
| application/vnd.ms-works | wks |
| application/vnd.ms-works | wps |
| application/winhlp | hlp |
| application/x-bcpio | bcpio |
| application/x-cdf | cdf |
| application/x-compress | z |
| application/x-compressed | tgz |
| application/x-cpio | cpio |
| application/x-csh | csh |
| application/x-director | dcr |
| application/x-director | dir |
| application/x-director | dxr |
| application/x-dvi | dvi |
| application/x-gtar | gtar |
| application/x-gzip | gz |
| application/x-hdf | hdf |
| application/x-internet-signup | ins |
| application/x-internet-signup | isp |
| application/x-iphone | iii |
| application/x-javascript | js |
| application/x-latex | latex |
| application/x-msaccess | mdb |
| application/x-mscardfile | crd |
| application/x-msclip | clp |
| application/x-msdownload | dll |
| application/x-msmediaview | m13 |
| application/x-msmediaview | m14 |
| application/x-msmediaview | mvb |
| application/x-msmetafile | wmf |
| application/x-msmoney | mny |
| application/x-mspublisher | pub |
| application/x-msschedule | scd |
| application/x-msterminal | trm |
| application/x-mswrite | wri |
| application/x-netcdf | cdf |
| application/x-netcdf | nc |
| application/x-perfmon | pma |
| application/x-perfmon | pmc |
| application/x-perfmon | pml |
| application/x-perfmon | pmr |
| application/x-perfmon | pmw |
| application/x-pkcs12 | p12 |
| application/x-pkcs12 | pfx |
| application/x-pkcs7-certificates | p7b |
| application/x-pkcs7-certificates | spc |
| application/x-pkcs7-certreqresp | p7r |
| application/x-pkcs7-mime | p7c |
| application/x-pkcs7-mime | p7m |
| application/x-pkcs7-signature | p7s |
| application/x-sh | sh |
| application/x-shar | shar |
| application/x-shockwave-flash | swf |
| application/x-stuffit | sit |
| application/x-sv4cpio | sv4cpio |
| application/x-sv4crc | sv4crc |
| application/x-tar | tar |
| application/x-tcl | tcl |
| application/x-tex | tex |
| application/x-texinfo | texi |
| application/x-texinfo | texinfo |
| application/x-troff | roff |
| application/x-troff | t |
| application/x-troff | tr |
| application/x-troff-man | man |
| application/x-troff-me | me |
| application/x-troff-ms | ms |
| application/x-ustar | ustar |
| application/x-wais-source | src |
| application/x-x509-ca-cert | cer |
| application/x-x509-ca-cert | crt |
| application/x-x509-ca-cert | der |
| application/ynd.ms-pkipko | pko |
| application/zip | zip |
| audio/basic | au |
| audio/basic | snd |
| audio/mid | mid |
| audio/mid | rmi |
| audio/mpeg | mp3 |
| audio/x-aiff | aif |
| audio/x-aiff | aifc |
| audio/x-aiff | aiff |
| audio/x-mpegurl | m3u |
| audio/x-pn-realaudio | ra |
| audio/x-pn-realaudio | ram |
| audio/x-wav | wav |
| image/bmp | bmp |
| image/cis-cod | cod |
| image/gif | gif |
| image/ief | ief |
| image/jpeg | jpe |
| image/jpeg | jpeg |
| image/jpeg | jpg |
| image/pipeg | jfif |
| image/svg+xml | svg |
| image/tiff | tif |
| image/tiff | tiff |
| image/x-cmu-raster | ras |
| image/x-cmx | cmx |
| image/x-icon | ico |
| image/x-portable-anymap | pnm |
| image/x-portable-bitmap | pbm |
| image/x-portable-graymap | pgm |
| image/x-portable-pixmap | ppm |
| image/x-rgb | rgb |
| image/x-xbitmap | xbm |
| image/x-xpixmap | xpm |
| image/x-xwindowdump | xwd |
| message/rfc822 | mht |
| message/rfc822 | mhtml |
| message/rfc822 | nws |
| text/css | css |
| text/h323 | 323 |
| text/html | htm |
| text/html | html |
| text/html | stm |
| text/iuls | uls |
| text/plain | bas |
| text/plain | c |
| text/plain | h |
| text/plain | txt |
| text/richtext | rtx |
| text/scriptlet | sct |
| text/tab-separated-values | tsv |
| text/webviewhtml | htt |
| text/x-component | htc |
| text/x-setext | etx |
| text/x-vcard | vcf |
| video/mpeg | mp2 |
| video/mpeg | mpa |
| video/mpeg | mpe |
| video/mpeg | mpeg |
| video/mpeg | mpg |
| video/mpeg | mpv2 |
| video/quicktime | mov |
| video/quicktime | qt |
| video/x-la-asf | lsf |
| video/x-la-asf | lsx |
| video/x-ms-asf | asf |
| video/x-ms-asf | asr |
| video/x-ms-asf | asx |
| video/x-msvideo | avi |
| video/x-sgi-movie | movie |
| x-world/x-vrml | flr |
| x-world/x-vrml | vrml |
| x-world/x-vrml | wrl |
| x-world/x-vrml | wrz |
| x-world/x-vrml | xaf |
| x-world/x-vrml |
Q3：Excel导出的第二种方式
此方法需要导入几个架包，需要的联系我，我把压缩包发给你
具体是哪一个我也不太清楚，所以我就全部导入了
--第一个类(Util)，这个类用余测试数据，没有数据库连接
package ExcelUtil;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.junit.Test;
public class Util {
public static void main(String[] args) throws Exception {
//writIntoExcel();
testReadExcel();
}
public static void writIntoExcel(){
/**
* 注意这只是07版本以前的做法对应的excel文件的后缀名为.xls
* 07版本和07版本以后的做法excel文件的后缀名为.xlsx
*/
//创建新工作簿
HSSFWorkbook workbook = new HSSFWorkbook();
//新建工作表
HSSFSheet sheet = workbook.createSheet("hello");
//创建行,行号作为参数传递给createRow()方法,第一行从0开始计算
HSSFRow row = sheet.createRow(0);
//创建单元格,row已经确定了行号,列号作为参数传递给createCell(),第一列从0开始计算
HSSFCell cell = row.createCell(2);
//设置单元格的值,即C1的值(第一行,第三列)
cell.setCellValue("hello china");
//输出到磁盘中
FileOutputStream fos;
try {
fos = new FileOutputStream(new File("D:11.xls"));
workbook.write(fos);
workbook.close();
fos.close();
System.out.println("写入成功!");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Test
public static void testReadExcel() throws Exception
{
//创建输入流
FileInputStream fis = new FileInputStream(new File("D:11.xls"));
//通过构造函数传参
HSSFWorkbook workbook = new HSSFWorkbook(fis);
//获取工作表
HSSFSheet sheet = workbook.getSheetAt(0);
//获取行,行号作为参数传递给getRow方法,第一行从0开始计算
HSSFRow row = sheet.getRow(0);
//获取单元格,row已经确定了行号,列号作为参数传递给getCell,第一列从0开始计算
HSSFCell cell = row.getCell(2);
//设置单元格的值,即C1的值(第一行,第三列)
String cellValue = cell.getStringCellValue();
System.out.println("第一行第三列的值是"+cellValue);
workbook.close();
fis.close();
}
}
--第二个类(ExcelControl)，这个类可以连接数据库
package ExcelUtil;
import java.io.FileOutputStream;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
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.ss.usermodel.HorizontalAlignment;
import dao.UinfoDao;
import vo.uinfo;
public class ExcelControl {
/**
* @功能：手工构建一个简单格式的Excel
*/
/*private static List<uinfo> getMember() throws Exception
{
List list = new ArrayList();
SimpleDateFormat df = new SimpleDateFormat("yyyy-mm-dd");
//javabean 实体类
uinfo user1 = new uinfo(1,"1998-05-13","男","广东韶关");
uinfo user2 = new uinfo(2,"1999-10-13","女","广东珠海");
uinfo user3 = new uinfo(3,"2000-07-13","男","广东广州");
list.add(user1);
list.add(user2);
list.add(user3);
return list;
} */
private static UinfoDao uinfodao=new UinfoDao();
public static List<uinfo> getMember(){
List<uinfo>list=uinfodao.getAllUinfo();
return list;
}
public static void main(String[] args) throws Exception
{
// 第一步，创建一个webbook，对应一个Excel文件
HSSFWorkbook wb = new HSSFWorkbook();
// 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
HSSFSheet sheet = wb.createSheet("信息表一");
// 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
HSSFRow row = sheet.createRow((int) 0);
// 第四步，创建单元格，并设置值表头 设置表头居中
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HorizontalAlignment.CENTER);// 创建一个居中格式
HSSFCell cell = row.createCell((short) 0);
cell.setCellValue("编号");
cell.setCellStyle(style);
cell = row.createCell((short) 1);
cell.setCellValue("出生日期");
cell.setCellStyle(style);
cell = row.createCell((short) 2);
cell.setCellValue("性别");
cell.setCellStyle(style);
cell = row.createCell((short) 3);
cell.setCellValue("籍贯");
cell.setCellStyle(style);
// 第五步，写入实体数据 实际应用中这些数据从数据库得到，
List list = ExcelControl.getMember();
for (int i = 0; i < list.size(); i++)
{
row = sheet.createRow((int) i + 1);
uinfo info = (uinfo) list.get(i);
// 第四步，创建单元格，并设置值
row.createCell((short) 0).setCellValue((double) info.getUid());
row.createCell((short) 1).setCellValue(info.getUsex());
row.createCell((short) 2).setCellValue((String)info.getUbirthday());
row.createCell((short) 3).setCellValue(info.getUaddress());
//cell.setCellValue(new SimpleDateFormat("yyyy-mm-dd").format(info.getUaddress()));
}
// 第六步，将文件存到指定位置
try
{
FileOutputStream fout = new FileOutputStream("C:\\Users\\one\\Desktop\\Members.xls");
wb.write(fout);
fout.close();
System.out.println("写入成功!");
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
--上面从数据库读取文件就需要各位自己弄了，大家把代码好好看看就明白了
原文地址：https://www.cnblogs.com/zywds/p/9362310.html
时间： 2024-07-31 19:40:11