1.前端

function downloadFile() {let pictureSourceServer = "http://192.168.1.1:8080/downFile/";let fileName = "测试文档.xlsx";let fileURL = pictureSourceServer + fileName;// 创建一个隐藏的链接元素let link = document.createElement("a");link.href = fileURL;link.download = fileName;  // 设置下载时文件名document.body.appendChild(link);// 模拟点击链接，触发文件下载link.click();// 下载后移除链接document.body.removeChild(link);
}

2.Tomcat服务器内配置

web.xml的最下边

<Context docBase="E:\tomcat\downFile" path="/downFile" />	<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"prefix="localhost_access_log" suffix=".txt"pattern="%h %l %u %t &quot;%r&quot; %s %b" />

3.在Tomcat映射的文件内放置文件

4.重启Tomcat，下载测试