package com.lijiaming.servlet;
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;
/**
* @基本功能:
* @ClassName: FileServlet
* @Description: TODO
* @Author: lijiaming
* @Date: 2022/2/17 21:45
* @Version 1.0
*/
public class FileServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1、要获取下载文件的路径 C:\Users\李嘉明\Desktop\Java学习\JavaWeb\Maven_parent\Servlet01\src\main\resources\1.jpg
String realPath = "C:\\Users\\李嘉明\\Desktop\\Java学习\\JavaWeb\\Maven_parent\\Servlet01\\src\\main\\resources\\1.jpg";
System.out.println("下载文件的路径:"+ realPath);
//2、下载的文件名是啥
String fileName = realPath.substring(realPath.lastIndexOf("\\") + 1);
System.out.println("文件名字为:"+fileName);
//3、设置想办法让浏览器能够支持(Content-Disposition)下载我们需要的东西,中文文件 名URLEncoder.encode编码,否则有可能乱码
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OutputStream对象
ServletOutputStream outputStream = resp.getOutputStream();
// 7. 将FileOutputStream流写入到buffer缓冲区,使用OutputStream将缓冲区中的数据 输出到客户端!
while((len=in.read(buffer))>0){
outputStream.write(buffer,0,len);
}
in.close();
outputStream.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req,resp);
}
}
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Origin blog.csdn.net/weixin_43605266/article/details/122992937
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