SpringBoot获取resources目录下静态资源的两种方式

    @GetMapping("/get-template-1")
    public byte[] getTemplate() throws IOException {
        // 1.获取文件
        ClassPathResource resource = new ClassPathResource("template/excel/full/学生信息模板-填充.xlsx");

        // 2.构建响应头
        String fileName = "学生信息模板.xlsx";
        String encodedFileName = URLEncoder.encode(fileName, StandardCharsets.UTF_8);
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        headers.setContentDispositionFormData("attachment", encodedFileName);

        // 3.返回
        return ResponseEntity.ok()
                .headers(headers)
                .body(resource.getInputStream().readAllBytes()).getBody();
    }

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>17</source>
                    <target>17</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

    @GetMapping("/get-template-2")
    public void getTemplate2(HttpServletResponse response) throws IOException {
        // 1.获取文件
        ClassPathResource resource = new ClassPathResource("template/excel/full/学生信息模板-填充.xlsx");

        // 2.构建响应头
        String fileName = "学生信息模板.xlsx";
        String encodedFileName = URLEncoder.encode(fileName, StandardCharsets.UTF_8);
        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition", "attachment; filename*=UTF-8''" + encodedFileName);

        // 3.写入到响应对象中
        try (InputStream inputStream = resource.getInputStream();
             OutputStream outputStream = response.getOutputStream()) {
            inputStream.transferTo(outputStream);
            outputStream.flush();
        }
    }