Springboot 读取文件并是实现浏览器下载

原创

猫七姑娘 2024-09-06 15:19:16 ©著作权

文章标签 java springboot 下载 文章分类 spring boot 后端开发

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添加依赖

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
</dependencies>

2.编写controller

import org.springframework.core.io.FileSystemResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

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

@Controller
public class FileDownloadController {

    @GetMapping("/download")
    public ResponseEntity<FileSystemResource> downloadFile(HttpServletResponse response) throws IOException {
        String filePath = "path/to/your/file.txt"; // 替换为实际文件路径
        Path path = Paths.get(filePath);

        // 检查文件是否存在
        if (!Files.exists(path)) {
            response.sendError(HttpServletResponse.SC_NOT_FOUND, "File not found");
            return null;
        }

        FileSystemResource file = new FileSystemResource(path.toFile());

        // 设置响应头
        HttpHeaders headers = new HttpHeaders();
        headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + path.getFileName() + "\"");

        return ResponseEntity.ok()
                .headers(headers)
                .contentLength(file.contentLength())
                .contentType(MediaType.parseMediaType("text/plain"))
                .body(file);
    }
}