1、pom.xml依赖

<dependencies>
	<!-- spring boot -->
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-web</artifactId>
	</dependency>
	<dependency>
		<groupId>org.apache.httpcomponents</groupId>
		<artifactId>httpclient</artifactId>
	</dependency>
	<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore -->
	<dependency>
		<groupId>org.apache.httpcomponents</groupId>
		<artifactId>httpcore</artifactId>
	</dependency>
	<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpmime -->
	<dependency>
		<groupId>org.apache.httpcomponents</groupId>
		<artifactId>httpmime</artifactId>
	</dependency>
</dependencies>

2、接口

2.1 一般参数

private Logger logger = LoggerFactory.getLogger(getClass());

private String filePath = "D:/1/";

@RequestMapping("/upLoadFile")
public User uploadFiles(@RequestParam("file") MultipartFile[] files,@RequestParam("em") String em) throws IOException {
	logger.info("em:{}",em);
	for (int i = 0; i < files.length; i++) {
		try {
			uploadFile(files[i].getBytes(), files[i].getOriginalFilename());
		} catch (Exception e) {
			e.printStackTrace();
			logger.info("上传文件发生错误");
		}
	}
	return new User("1", "张三", 12);
}

private void uploadFile(byte[] file, String fileName) throws Exception {
	File targetFile = new File(filePath);
	if (!targetFile.exists()) {
		targetFile.mkdirs();
	}
	FileOutputStream out = new FileOutputStream(filePath + fileName);
	out.write(file);
	out.flush();
	out.close();
}

2.2 对象注入

2.2.1 对象类型

import org.springframework.web.multipart.MultipartFile;

/**   
 * @Title: FormData.java 
 * @Package com.spring.pro.model 
 * @Description:  
 * @author ybwei  
 * @date 2018年11月14日 下午4:37:15 
 * @version V1.0   
 */
public class FormData {

	private String name;
    private String email;
    private MultipartFile file;
    private MultipartFile file2;
    
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public MultipartFile getFile() {
		return file;
	}
	public void setFile(MultipartFile file) {
		this.file = file;
	}
	public MultipartFile getFile2() {
		return file2;
	}
	public void setFile2(MultipartFile file2) {
		this.file2 = file2;
	}
}

2.2.2 接口

@RequestMapping("/upLoadFile2")
public User uploadFiles2(@ModelAttribute FormData fd) throws Exception {
	logger.info("fd:{}",JSON.toJSONString(fd));
	uploadFile(fd.getFile().getBytes(), fd.getFile().getOriginalFilename());
	uploadFile(fd.getFile2().getBytes(), fd.getFile2().getOriginalFilename());
	return new User("1", "张三", 12);
}

2.2.3 @ModelAttribute

1. 应用到方法
2. 应用到方法参数
3. 应用到方法上，方法使用了@RequestMapping

2.2.2 使用的是2。绑定请求参数到命令对象：放在功能处理方法的入参上时，用于将多个请求参数绑定到一个命令对象，从而简化绑定流程，而且自动暴露为模型数据用于视图页面展示时使用。

3、测试

参考https://blog.csdn.net/xixingzhe2/article/details/82982453