package cn.itcast.servlet;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class Download
*/
@WebServlet("/Download")
public class Download extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Download() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//获取图片的路径
String path=getServletContext().getRealPath("/image/1.jpg");
//获取输入流
InputStream in=new FileInputStream(path);
//设置头以附件的形式,如果不设置的话他就直接显示了
response.setHeader("Content-Disposition", "attachment;filename=1.jpg");
//获取输出流
ServletOutputStream out=response.getOutputStream();
byte[] b=new byte[1024];
int len=0;
//读写操作
while((len=in.read(b))!=-1){
out.write(b,0,len);
}
in.close();
out.close();
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
javaweb之打开一个页面,以附件的形式进行下载一个文件(原码)
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转载自blog.csdn.net/qq_41901915/article/details/85236020
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