一、jsp代码
<html>
<head>
<title></title>
</head>
<body>
<a href="./download">下载</a>
</body>
</html>
二、servlet代码
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
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.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
@WebServlet(name = "downloadServlet")
public class downloadServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取系要下载的文件
File file = new File("D:\\下载\\BaiduNetdisk_6.2.0.exe");
//获得输出流
OutputStream os = response.getOutputStream();
//获得文件扩展名
String extfilename = FilenameUtils.getExtension("D:\\下载\\BaiduNetdisk_6.2.0.exe");
//指定文件下载名 并指定编码格式
response.setHeader("Content-disposition","attachment;filename="+ URLEncoder.encode("百度云盘."+extfilename,"utf-8"));
//将文件写到输出流
IOUtils.copy(new FileInputStream(file),os);
//刷新流
os.flush();
//关闭流
os.close();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
}三、xml配置
<servlet>
<servlet-name>downloadServlet</servlet-name>
<servlet-class>downloadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>downloadServlet</servlet-name>
<url-pattern>/download</url-pattern>
</servlet-mapping>