代码示例:

@GetMapping("/download")
public void download(HttpServletResponse response) {
	try {
		String filename = "测试.xls";
		OutputStream outputStream = response.getOutputStream();
		// 获取springboot resource 路径下的文件
		InputStream inputStream = this.getClass().getResourceAsStream("/excel/text.xls");
		response.setContentType("application/vnd.ms-excel");
		response.setHeader("Content-Disposition", "attachment;fileName=" + new String(filename.getBytes("utf-8"), "iso-8859-1"));
		IOUtils.copy(inputStream, outputStream);
		inputStream.close();
		outputStream.flush();
	} catch (Exception e) {
		throw new ResponseStatusException(HttpStatus.INTERNAL_SERVER_ERROR, e.toString());
	}
}

提示：如果 inputStream 为null ，或者提示 文件路径不存在，执行 mvn clean 并 重启项目，查看target 目录下是否存在该文件

pom文件中添加一下配置，防止excel文件中文乱码

 <plugin>
	<groupId>org.apache.maven.plugins</groupId>
	<artifactId>maven-resources-plugin</artifactId>
	<version>2.6</version>
	<configuration>
		<encoding>UTF-8</encoding>
		<nonFilteredFileExtensions>
			<nonFilteredFileExtension>xls</nonFilteredFileExtension>
			<nonFilteredFileExtension>xlsx</nonFilteredFileExtension>
			<nonFilteredFileExtension>dat</nonFilteredFileExtension>
		</nonFilteredFileExtensions>
	</configuration>
</plugin>