页面代码：
<!DOCTYPE html> <html lang="utf-8"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <head> <title>标题</title> </head> <body> <h2>It works!</h2> <a href="/downloadLocalXlsxFile">Local xlsx file download</a> </body> </html> <script type="text/javascript"> <!-- // 脚本 //--> </script>
后台代码：
package com.example.demo; import java.io.FileInputStream; import java.net.URLDecoder; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller @SpringBootApplication public class SpringBootWeb1Application { public static void main(String[] args) { SpringApplication.run(SpringBootWeb1Application.class, args); } @RequestMapping("/") public String index() { return "index.html"; } @RequestMapping("/downloadLocalXlsxFile") public void downloadLocalXlsxFile(HttpServletResponse res, HttpServletRequest req) throws Exception { String localFilename = "Book1.xlsx"; String localFilepath = getClass().getResource("/templates/" + localFilename).getPath(); res.setContentType("multipart/form-data"); res.setCharacterEncoding("UTF-8"); res.setContentType("text/html"); String userAgent = req.getHeader("User-Agent"); if (userAgent.contains("MSIE") || userAgent.contains("Trident")) { // IE Core localFilename = java.net.URLEncoder.encode(localFilename, "UTF-8"); } else { // Non-IE Core localFilename = new String((localFilename).getBytes("UTF-8"), "ISO-8859-1"); } res.setHeader("Content-Disposition", "attachment;fileName=" + localFilename); localFilepath = URLDecoder.decode(localFilepath, "UTF-8"); FileInputStream instream = new FileInputStream(localFilepath); ServletOutputStream outstream = res.getOutputStream(); int b = 0; byte[] buffer = new byte[1024]; while ((b = instream.read(buffer)) != -1) { outstream.write(buffer, 0, b); } instream.close(); if (outstream != null) { outstream.flush(); outstream.close(); } } }