Servlet------文件的下载

package cui.ys.request;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.net.URLEncoder;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ResponseDemo2 extends HttpServlet {

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

// TODO Auto-generated method stub

String path=this.getServletContext().getRealPath("/download/截图.png");

System.out.println(path);

String filename =path.substring(path.lastIndexOf('\\'));

// resp.setHeader("content-disposition", "attachment;filename="+filename);

resp.setHeader("content-disposition", "attachment;filename="+URLEncoder.encode(filename,"UTF-8"));

InputStream in= null;

OutputStream out =null;

in=new FileInputStream(path);

try {

int len=0;

byte buffer[] = new byte[1024];

out=resp.getOutputStream();

while ((len=in.read(buffer))>0) {

out.write(buffer, 0, len);

}

} finally {

if (in!=null) {

in.close();

}

}

}

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

// TODO Auto-generated method stub

doGet(req, resp);

}

}