标签:添加 tip cat port inpu position int orm catch
本篇文章主要介绍的是SpringBoot实现文件上传下载。
GitHub源码链接位于文章底部。
<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.8</java.version>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
</properties>
<!--父级依赖,它用来提供相关的 Maven 默认依赖。使用它之后,常用的springboot包依赖可以省去version 标签-->
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.3.RELEASE</version>
    <relativePath ></relativePath>
</parent>
<dependencies>
    <!-- Spring Boot Web 依赖 核心 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.16.20</version>
    </dependency>
</dependencies>
server:
  port: 8080
spring:
  servlet:
    multipart:
      enabled: true
#      最大支持文件大小
      max-file-size: 100MB
#      最大支持请求大小
      max-request-size: 100MB
#文件存储路径
filepath: D:/file/文件存储路径可以修改,文件上传的大小限制这里设置的100M
在controller文件夹下创建FileController在controller文件夹下创建FileController
因为这里只进行文件上传下载,不进行业务逻辑处理,因此只用在控制层实现即可,定义文件上传、下载的接口。
@RestController
@RequestMapping("/file")
@Slf4j
public class FileController {
    @Value("${filepath}")
    private String filepath;
    /**
     * 处理文件上传
     */
    @PostMapping(value = "/upload")
    public String uploading(@RequestParam("file") MultipartFile file) {
        File targetFile = new File(filepath);
        if (!targetFile.exists()) {
            targetFile.mkdirs();
        }
        try (FileOutputStream out = new FileOutputStream(filepath + file.getOriginalFilename());){
            out.write(file.getBytes());
        } catch (Exception e) {
            e.printStackTrace();
            log.error("文件上传失败!");
            return "uploading failure";
        }
        log.info("文件上传成功!");
        return "uploading success";
    }
    @RequestMapping("/download")
    public void downLoad(HttpServletResponse response) throws UnsupportedEncodingException {
        String filename="JAVA核心知识点整理.pdf";
        String filePath = "D:/file" ;
        File file = new File(filePath + "/" + filename);
        if(file.exists()){
            response.setContentType("application/octet-stream");
            response.setHeader("content-type", "application/octet-stream");
            response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(filename,"utf8"));
            byte[] buffer = new byte[1024];
            //输出流
            OutputStream os = null;
            try(FileInputStream fis= new FileInputStream(file);
                BufferedInputStream bis = new BufferedInputStream(fis);) {
                os = response.getOutputStream();
                int i = bis.read(buffer);
                while(i != -1){
                    os.write(buffer);
                    i = bis.read(buffer);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}在resource下创建static文件夹,在static文件夹下创建file.html
springboot项目中,静态资源默认访问目录就是resource下的static文件夹
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>文件上传</title>
</head>
<body>
<form enctype="multipart/form-data" method="post" action="file/upload">
    <input type="file" name="file"/>
    <input type="submit" value="上传"/>
</form>
<a href="/file/download">文件下载</a>
</body>
</html>在controller同级的目录下创建启动类FileApplication
@SpringBootApplication
public class FileApplication {
    public static void main(String[] args) {
        SpringApplication.run(FileApplication.class, args);
    }
}测试:运行启动类,访问localhost:8080/file.html ,进行相关操作。
本文GitHub源码:https://github.com/lixianguo5097/springboot/tree/master/springboot-file
CSDN:https://blog.csdn.net/qq_27682773
简书:https://www.jianshu.com/u/e99381e6886e
博客园:https://www.cnblogs.com/lixianguo
个人博客:https://www.lxgblog.com
标签:添加 tip cat port inpu position int orm catch
原文地址:https://www.cnblogs.com/lixianguo/p/12518970.html