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: 2024-10-10 13:49:29