Spring Boot 2.X - (多)文件上传

ゝ一纸荒年。 2022-03-27 11:46 213阅读 0赞

# spring-boot-v2-fileupload #

> Spring Boot 2.X 上传(多)文件 Demo

1.  导入相关依赖:

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>

1.  修改配置application.properties:

# 设置访问端口号为80
    server.port=80
    # 禁用thymeleaf缓存
    spring.thymeleaf.cache=false
    # 默认上传文件最大1M
    spring.servlet.multipart.max-file-size=2MB
    # 上传请求最大为10M(默认10M)
    spring.servlet.multipart.max-request-size=10MB
    # 是否支持批量上传，默认支持
    spring.servlet.multipart.enabled=true

注:上传文件超出大小报异常:

org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 2097152 bytes.

1.  创建上传页面：  
    `在src\main\resources\templates\下新建index.html`

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>文件上传Demo</title>
    </head>
    <body>
    <h2>单文件上传示例</h2>
    <div>
        <form method="POST" enctype="multipart/form-data" action="/upload1">
            <p>
                文件：<input type="file" name="file"/>
                <input type="submit" value="上传"/>
            </p>
        </form>
    </div>
    
    <hr/>
    <h2>多文件上传示例</h2>
    <div>
        <form method="POST" enctype="multipart/form-data" action="/upload2">
            <p>
                文件1：<input type="file" name="file"/>
            </p>
            <p>
                文件2：<input type="file" name="file"/>
            </p>
            <p>
                <input type="submit" value="上传"/>
            </p>
        </form>
    </div>
    </body>
    </html>

1.  编写后端代码:  
    `新建controller.UploadController`

@RestController
    @Slf4j
    public class UploadController { 
        /** * 访问上传页面 * @return */
        @GetMapping("/index")
        public Object index(){ 
            return new ModelAndView("index");
        }
    
        /** * 单文件上传 * @param file * @return * @throws IOException */
        @PostMapping("/upload1")
        public Object upload1(MultipartFile file) throws IOException { 
            log.info("[文件类型] - [{}]", file.getContentType());
            log.info("[文件名称] - [{}]", file.getOriginalFilename());
            log.info("[文件大小] - [{}]", file.getSize());
            Path dest = Paths.get("D:\\upload\\" + file.getOriginalFilename());
            file.transferTo(dest);
            Map<String,Object> result = getResult(file);
            return result;
        }
    
        /** * 多文件上传 * @param files * @return * @throws IOException */
        @PostMapping("/upload2")
        public Object upload2(@RequestParam("file") MultipartFile[] files) throws IOException { 
            if (ObjectUtils.isEmpty(files)) { 
                return "文件不能为空";
            }
            List<Map<String,Object>> list = new ArrayList<>();
            String basePath = "D:\\upload\\multi\\";
            for (MultipartFile file : files) { 
                file.transferTo(new File(basePath + file.getOriginalFilename()));
                Map<String,Object> result = getResult(file);
                list.add(result);
            }
            return list;
        }
    
        private Map<String,Object> getResult(MultipartFile file) { 
            Map<String,Object> result = new HashMap<>(4);
            result.put("contentType", file.getContentType());
            result.put("fileName", file.getOriginalFilename());
            result.put("fileSize", file.getSize() + "");
            return result;
        }
    }

1.  启动主方法

@SpringBootApplication
    public class SpringBootV2FileuploadApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(SpringBootV2FileuploadApplication.class, args);
        }
    }

1.  访问`http://localhost/index`:  
    ![上传页面][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0UwOTYyMDEyNg_size_16_color_FFFFFF_t_70]

> 详细代码：
> 
> > GitHub：[https://github.com/xudc0521/spring-boot-v2/tree/master/spring-boot-v2-fileupload][https_github.com_xudc0521_spring-boot-v2_tree_master_spring-boot-v2-fileupload]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0UwOTYyMDEyNg_size_16_color_FFFFFF_t_70]: /images/20220327/7a5777bd22134a18bd0d8000d6ef0f12.png
[https_github.com_xudc0521_spring-boot-v2_tree_master_spring-boot-v2-fileupload]: https://github.com/xudc0521/spring-boot-v2/tree/master/spring-boot-v2-fileupload