文件下载
Jsp:
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>download</title>
</head>
<body>
<a href="/DownLoadServlet?name=test">test.jpg</a>
<a href="/DownLoadServlet?name=ceshi">ceshi.txt</a>
</body>
</html>
Servlet:
package com.wildfire.servlet.upload;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
@WebServlet("/DownLoadServlet")
public class DownLoadServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String name=req.getParameter("name");
String fileName="";
switch (name){
case "test":
fileName="test.jpg";
break;
case "ceshi":
fileName="ceshi.txt";
break;
}
//设置响应模式
resp.setContentType("application/x-msdownload");
//设置下载之后的文件名
resp.setHeader("Content-Disposition","attachment;filename="+fileName);
//获取输出流
OutputStream outputStream=resp.getOutputStream();
String path=req.getServletContext().getRealPath("file/"+fileName);
InputStream inputStream=new FileInputStream(path);
int temp=0;
while((temp=inputStream.read())!=-1){
outputStream.write(temp);
}
//关闭输入输出流
inputStream.close();
outputStream.close();
}
}
使用IDEA的时候要注意，在WEB-INF下创建file目录，将图片和文件粘贴到该目录下，然后使用工具栏Build--》Rebuild Project，否则可能无法同步到out下。