package cn.itcast.request;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import javax.print.attribute.standard.OutputDeviceAssigned;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class DownFile extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//得到文件的完全路径
String path=getServletContext().getRealPath("/img/psb.jpg");
//得到名称 截取字符串
//找到最后一个斜杠
int lens=path.lastIndexOf("\\");
//截取
String filename=path.substring(lens+1);
//处理ie中文文件名的问题
URLEncoder.encode(filename, "utf-8");
//设置头
response.setHeader("Content-Disposition", "attachment;filename"+filename);
//使用输入流来拿到这个文件
InputStream in=new FileInputStream(path);
//使用输出流 把文件写到浏览器
OutputStream out=response.getOutputStream();
//流对接
int len=0;
byte[] b=new byte[1024];
while((len=in.read(b))!=-1){
out.write(b,0,len);
}
//关闭流
in.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}