Question

java Servlet问题：以下代码在浏览器运行时出错,出错情况如图，Why??????

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
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 PDFServlet extends HttpServlet {
protected void doGet(HttpServletRequest request,
HttpServletResponse res) throws ServletException, IOException {
res.setContentType( "application/pdf" );
ServletOutputStream out =res.getOutputStream ();
res.setHeader("Content-disposition","attachment;filename=Example.pdf");
File pdf =null;
BufferedInputStream buf=null;
try{
pdf=new File("c:\\sample.pdf");
res.setContentLength( (int) pdf.length( ) );
FileInputStream input = new FileInputStream(pdf);
buf = new BufferedInputStream(input);
int readBytes = 0;
//read from the file; write to the ServletOutputStream
while((readBytes = buf.read( )) != -1)
out.write(readBytes);
}
catch(IOException e){
System.out.println("file not found!");
}finally {
//close the input/output streams
if (out != null)
out.close( );
if (buf != null)
buf.close( );
}
}
}

在输出窗口输出：file not found! 但我可以肯定的是，我的路径绝对绝对没有错（否则我就不问了，我检查了N次）。为什么会出错呢？？

Answer 1

可能是路径分隔符的问题，不要用手写的，用JAVA API 提供的File.separator试试！

追问

File.separator怎么用

追答

pdf=new File("c:"+File.separator+"sample.pdf");

Answer 2

我也觉得很奇怪，我试了好多次，没有出现你那个错误。你的路径是正确的。补充：我用的是JDK1.6

Answer 3

分号忘点了吧