Springboot 文件下载

<!-- pom.xml -->
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- 其他依赖 -->
</dependencies>

package com.sh.system.controller;

import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

@RestController
@RequestMapping("/files")
public class FileController {

    // 从服务器文件系统下载文件
    @GetMapping("/download/server")
    public ResponseEntity<byte[]> downloadFromServer(HttpServletResponse response) throws IOException {
        Path filePath = Paths.get("D:\\测试下载.docx");
        byte[] data = Files.readAllBytes(filePath);
        //
        String originalFileName = filePath.getFileName().toString();
        String fileName = new String(originalFileName.getBytes("UTF-8"), "ISO-8859-1");
        // 设置响应头
        HttpHeaders headers = new HttpHeaders();
        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + fileName + "\"");
        headers.add(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_OCTET_STREAM_VALUE);

        return ResponseEntity.ok()
                .headers(headers)
                .contentLength(data.length)
                .body(data);
    }



    // 从类路径下下载文件
    @GetMapping("/download/classpath")
    public ResponseEntity<Resource> downloadFromClasspath(HttpServletResponse response) throws IOException {
        Resource resource = new ClassPathResource("static/deepSeek说明.docx");
        String originalFileName = resource.getFilename();
        String fileName = new String(originalFileName.getBytes("UTF-8"), "ISO-8859-1");
        // 设置响应头
        HttpHeaders headers = new HttpHeaders();
        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + fileName + "\"");
        headers.add(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_OCTET_STREAM_VALUE);

        return ResponseEntity.ok()
                .headers(headers)
                .body(resource);
    }
}

放置测试文件：
如果你选择从类路径下载文件，将文件（例如example.txt）放在src/main/resources/static/目录下。
如果你选择从服务器文件系统下载文件，确保文件路径正确，并且Spring Boot应用有权限访问该文件。
运行应用：启动Spring Boot应用，并访问以下URL测试文件下载功能：
类路径文件下载：http://localhost:8080/files/download/classpath
服务器文件系统文件下载：http://localhost:8080/files/download/server