教你学会下载图片，文档，excel导入导出

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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.pluginsorg.eclipse.wst.server.core	mp0wtpwebappsAjaxResultimages12.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();
    }

}

技术分享图片

--点击下载时

技术分享图片

 

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
";
        
        for (int i = 1; i <=10; i++) {
            result+="2018-06-"+i+","+(i*10)+"万
";
        }
        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
";
            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()+"
";
            }
            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 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

技术分享图片

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

 

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