文件直接下载而不用ie打开的例子

实例演示

很多文件下载都会直接用ie窗口来打开，如word、excel、图片等.但很多时侯用户都是要求直接下载,而不用ie打开.下面详细介绍其方法.
调用文件直接下载的页面use_download.jsp,代码如下
<HTML>
<HEAD>
<TITLE>北天JAVA技术网->文件直接下载而不用ie打开的例子</TITLE>
<link rel="stylesheet" type="text/css" href="site.css">
</head>

<BODY bgColor=menu topmargin=15 leftmargin=15 >
<CENTER>
<BR>
<BR>
<BR>
<BR>

<table width=100%>
    <tr>
      <td align=center>
      <a href="javascript:self.location='download.jsp?download_file=/download/testword.doc';">文件直接下载</a>
      </td>
    </tr>
</table>

</center>
</body>
</html>

//文件直接下载组件页面download.jsp,代码如下
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page import="java.io.*"%>
<%!
public String toUtf8String(String s) {
StringBuffer sb = new StringBuffer();
for (int i=0;i<s.length();i++) {
char c = s.charAt(i);
if (c >= 0 && c <= 255) {
sb.append(c);
} else {
byte[] b;
try {
b = Character.toString(c).getBytes("utf-8");
} catch (Exception ex) {
System.out.println(ex);
b = new byte[0];
}
for (int j = 0; j < b.length; j++) {
int k = b[j];
if (k < 0) k += 256;
sb.append("%" + Integer.toHexString(k).
toUpperCase());
}
}
}
return sb.toString();
}
%>
<%

String download_file=request.getParameter("download_file");

String filename=download_file.substring(download_file.lastIndexOf("/")+1,download_file.length());

//out.print("filename"+filename);
String dir= download_file.substring(0,download_file.lastIndexOf("/"));
//out.print("dir"+dir);
String dirName=application.getRealPath(dir);
java.io.File ff=null;
String dd=dirName+System.getProperties().getProperty("file.separator")+filename;
int filename_start=(filename.lastIndexOf(".")-30)<0?0:(filename.lastIndexOf(".")-20);
filename=filename.substring(filename_start,filename.length());
try{
ff=new java.io.File(dd);
}
catch(Exception e){
%>
<script language="javascript">
alert('对不起,指定的文件不存在!');
window.history.back();
</script>
<%
e.printStackTrace();
return ;
}
if (ff!=null&&ff.exists()&&ff.isFile())
{
long filelength = ff.length();
InputStream inStream=new FileInputStream(dd);
//设置输出的格式
response.reset();
response.setContentType("application/x-msdownload");
response.setContentLength((int)filelength);
response.addHeader("Content-Disposition","attachment; filename=\"" + toUtf8String(filename) + "\"");
//循环取出流中的数据
byte[] b = new byte[100];
int len;
while((len=inStream.read(b)) >0)
response.getOutputStream().write(b,0,len);
inStream.close();

} else{
%>
<script language="javascript">
alert('对不起,指定的文件不存在!');
window.history.back();
</script>
<%
return ;
}
%>
<script language="JavaScript" type="text/JavaScript">
window.close();
</script>

实例演示