javaweb文件下载操作
2021/12/11 22:46:48
本文主要是介绍javaweb文件下载操作,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
package top.spirit.servlet; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; 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.net.URLEncoder; public class ServletDemo06 extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //1、获取下载文件的路径 String realPath = this.getServletContext().getRealPath("/WEB-INF/classes/中文.png"); System.out.println(realPath); //2、设置文件下载名 String fileName = realPath.substring(realPath.lastIndexOf("\\")+1); //3、设置浏览器下载头 resp.setHeader("Content-Disposition","attachment;filename="+ URLEncoder.encode(fileName,"utf-8")); //4、获取下载文件的输入流 FileInputStream in = new FileInputStream(realPath); //5、创建缓冲区 int len = 0; byte[] buffer = new byte[1024]; //6、获取OutputString对象 ServletOutputStream out = resp.getOutputStream(); //7、将FileOutputStream写入到buffer缓冲区,使用OutputStream将缓冲区数据输出到客户端 while((len=in.read(buffer))>0){ out.write(buffer,0,len); } out.close(); in.close(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } }
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