Spring Boot实现文件上传

程序员文章站 2022-06-02 14:09:47

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Spring Boot实现文件上传功能

环境：maven3.3.3
     jdk1.8
     Spring Boot 1.5.15.RELEASE

1. pom文件中引入相关的依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.15.RELEASE</version>
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>

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

2. 在classpath的static目录下新建一个html文件upload.html,编写前段代码

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form action="fileupload" method="post" enctype="multipart/form-data">
        <input type="file" name="file">
        <input type="submit" name="提交">
    </form>
</body>
</html>

3. 编写controller

/**
 * 文件上传，文件上传后保存在D盘根目录下，文件保存后的名字为原文件名称
 *
 */
@RestController
public class FileUploadController {

    @RequestMapping("/fileupload")
    public Map<String, Object> uploadFile(MultipartFile file) throws Exception{
        file.transferTo(new File("d:/"+file.getOriginalFilename()));
        Map<String, Object> map = new HashMap<>();
        map.put("msg", "ok");
        return map;
    }
}

4. 编写启动类，启动测试

@SpringBootApplication
public class App {

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

5. 设置文件上传的默认值

需要在classpath下添加SpringBoot的配置文件：application.properties
在配置文件中加入以下配置：
设置单个上传文件的大小：spring.http.multipart.maxFileSize=200MB
设置一次请求上传文件的总容量：spring.http.multipart.maxRequestSize=200MB

6. 测试结果

Spring Boot实现文件上传