参考： http://www.layui.com/doc/modules/upload.html
<1> 文件上传(以下函数必须要在js文件加载时执行) ???upload.render({ ?????elem: ‘#id‘, ?????url: ‘/api/upload/‘, ?????before: function(obj){ //obj参数包含的信息，跟 choose回调完全一致，可参见上文。 ???????layer.load(); //上传loading ?????}, ?????done: function(res, index, upload){ ???????layer.closeAll(‘loading‘); //关闭loading ?????}, ?????error: function(index, upload){ ???????layer.closeAll(‘loading‘); //关闭loading ?????} ???}); ??
<2> 文件下载 参考：https://memorynotfound.com/spring-mvc-download-file-examples/
package com.memorynotfound.controller;import org.springframework.core.io.FileSystemResource;import org.springframework.core.io.Resource;import org.springframework.http.HttpEntity;import org.springframework.http.HttpHeaders;import org.springframework.http.MediaType;import org.springframework.stereotype.Controller;import org.springframework.util.FileCopyUtils;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;import javax.servlet.http.HttpServletResponse;import java.io.*;@Controller@RequestMapping("/download")public class DownloadController { ???private static final String FILE_PATH = "/tmp/example.pdf"; ???private static final String APPLICATION_PDF = "application/pdf"; ???@RequestMapping(value = "/a", method = RequestMethod.GET, produces = APPLICATION_PDF) ???public @ResponseBody void downloadA(HttpServletResponse response) throws IOException { ???????File file = getFile(); ???????InputStream in = new FileInputStream(file); ???????response.setContentType(APPLICATION_PDF); ???????response.setHeader("Content-Disposition", "attachment; filename=" + file.getName()); ???????response.setHeader("Content-Length", String.valueOf(file.length())); ???????FileCopyUtils.copy(in, response.getOutputStream()); ???} ???@RequestMapping(value = "/b", method = RequestMethod.GET, produces = APPLICATION_PDF) ???public @ResponseBody HttpEntity<byte[]> downloadB() throws IOException { ???????File file = getFile(); ???????byte[] document = FileCopyUtils.copyToByteArray(file); ???????HttpHeaders header = new HttpHeaders(); ???????header.setContentType(new MediaType("application", "pdf")); ???????header.set("Content-Disposition", "inline; filename=" + file.getName()); ???????header.setContentLength(document.length); ???????return new HttpEntity<byte[]>(document, header); ???} ???@RequestMapping(value = "/c", method = RequestMethod.GET, produces = APPLICATION_PDF) ???public @ResponseBody Resource downloadC(HttpServletResponse response) throws FileNotFoundException { ???????File file = getFile(); ???????response.setContentType(APPLICATION_PDF); ???????response.setHeader("Content-Disposition", "inline; filename=" + file.getName()); ???????response.setHeader("Content-Length", String.valueOf(file.length())); ???????return new FileSystemResource(file); ???} ???private File getFile() throws FileNotFoundException { ???????File file = new File(FILE_PATH); ???????if (!file.exists()){ ???????????throw new FileNotFoundException("file with path: " + FILE_PATH + " was not found."); ???????} ???????return file; ???}出现的问题：
1. 上传后，出现文件下载框（一般为ie下），那么你需要在服务端对response的header设置 Content-Type: text/html
??? response.addHeader("Content-Type","text/html");
2. 如果上传后，文件名称回显为乱码
?? response.addHeader("Content-Type","text/html;charset=utf-8");
layerui上传文件
原文地址：https://www.cnblogs.com/lvlin241/p/9313317.html