jsp+javaBean实现文件下载
文件下载
package
mybean;
import
java.io.*;
public
class
FileNameAccept
implements
FilenameFilter{
@Override
public
boolean
accept(File dir, String filename) {
//
TODO
Auto-generated method stub
boolean
boo=
false
;
if
(filename.endsWith(
".doc"
)||filename.endsWith(
".DOC"
))
{
System.
out
.println(
"
是
doc
文件
..."
);
boo=
true
;
}
return
boo;
}
}
//
文件下载
package mybean;
import java.io.*;
import javax.servlet.http.*;
public class downFileBean {
HttpServletResponse response;
String fileName;
String dirPath;
String fileMIME;
public void setFileMIME(String fileMIME)
{
System.out.println("setFileMIME...");
this.fileMIME=fileMIME;
}
public void setResponse(HttpServletResponse response)
{
System.out.println("setResponse...");
this.response=response;
}
public void setDirPath(String dirPath)
{
System.out.println("setDirPath...");
this.dirPath=dirPath;
}
public void setFileName(String fileName)
{
System.out.println("
设置
filename...");
this.fileName=fileName;
try{
//
得到向客户端输出的输出流
System.out.println("outputStream...");
OutputStream outStream1=response.getOutputStream();
//
输出文件用的字符数组
byte bb[]=new byte[600];
//
要下载的文件
File fileload=new File(dirPath,this.fileName);
//
客户端打开保存文件对话框
response.setHeader("content-disposition","attachment;filename="+fileName);
response.setContentType(fileMIME);
long filelength=fileload.length();
String length=String.valueOf(filelength);
//
通知客户端文件长度
response.setHeader("content_length",length);
//
读取文件并发送给客户端
FileInputStream in=new FileInputStream(fileload);
int n=0;
while((n=in.read(bb))!=-1)
{
outStream1.write(bb,0,n);
}
}
catch(Exception e)
{
System.out.println(e.toString());
}
}
}
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="mybean.downFileBean"%>
<jsp:useBean id="downf" class="mybean.downFileBean" scope="page"/>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>ch6_9_down.jsp</title>
</head>
<body>
<jsp:setProperty name="downf" property="dirPath" value="d:\\data"/>
<jsp:setProperty name="downf" property="response" value="<%=response%>"></jsp:setProperty>
<jsp:setProperty name="downf" property="fileMIME" value="application/msword"/>
<jsp:setProperty name="downf" property="fileName" value="<%=request.getParameter("filename")%>"/>
</body>
</html>
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="mybean.FileNameAccept"%>
<%@ page import="java.util.*"%>
<%@ page import="java.io.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>ch6_9.jsp</title>
</head>
<body>
<%
File file1=new File("d:\\data");
File filelist[]=file1.listFiles(new FileNameAccept());
int count=0;
out.print("<table border>");
out.print("<tr><td colspan=4 align=center>");
out.print("d:\\data
目录文件列表
</td></tr>");
out.print("<tr><td width=40>"+"
序号
"+"</td>");
out.print("<td width=300>"+"
文件名
"+"</td>");
out.print("<<td width=80>"+"
文件长度
"+"</td>");
out.print("<td width=80>"+"
下载吗
?"+"</td>");
out.print("</tr>");
for(File me:filelist)
{
count++;
out.print("<tr>");
out.print("<td>"+count+"</td>");
out.print("<td>"+me.getName()+"</td>");
out.print("<td>"+me.length()+"</td>");
out.print("<td><a href='ch6_9_down.jsp?filename="+me.getName()+"'>
我要下载
</a></td>");
out.print("</tr>");
}
%>
</body>
</html>3/7/2011 11:04:37 PM