| 发表于：2008-01-10 21:08:32 楼主 |
我写了个简单的下载servlet，代码如下，但点击下载附件链接时弹出下载窗口，点击下载则报错，错误如题，可这并不影响正常下载，请问为何？
package net.servlet;
import java.io.fileinputstream;
import java.io.outputstream;
import java.io.ioexception;
import java.io.printwriter;
import net.object.*;
import javax.servlet.servletexception;
import javax.servlet.servletoutputstream;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
public class getfile extends httpservlet {
public getfile（) {
super（);
}
public void destroy（) {
super.destroy（); // just puts "destroy" string in log
}
public void doget（httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
string attachid=request.getparameter（"attach");//获取附件编号
string realpath=request.getrealpath（"/");
string filepath=getservletcontext（).getinitparameter（"filepath");
fileinputstream in=null;
servletoutputstream output = null;
int id=integer.valueof（attachid);
messagedao messagedao=new messagedao（);
message message=new message（);
message=messagedao.findbyid（id);
string attachname=message.getmessageattach（);//获取附件名称
string u_name =realpath+ filepath+"\\"+ attachname ;
try
{
response.reset（);
response.setcontenttype（"application/x-msdownload");
response.setheader（"content-disposition", "attachment; filename=" + toutf8string（attachname));
in = new fileinputstream（u_name);
output=response.getoutputstream（);
output.flush（);
int aread = 0;
while（（aread = in.read（)) != -1 & in != null)
{
output.write（aread);
}
output.flush（);
}
catch（exception e)
{
e.printstacktrace（);
}
finally
{
in.close（);
output.close（);
}
}
public void init（) throws servletexception {
// put your code here
}
public static 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（);
}
}
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