1.spring boot 1.x 版本

application.properties 文件中 位置在（resources下）

spring.http.multipart.maxFileSize = 10Mb

spring.http.multipart.maxRequestSize=100Mb

2.spring boot 2.x 版本

application.properties 文件中 位置在（resources下）

spring.servlet.multipart.max-file-size=1024MB
spring.servlet.multipart.max-request-size=1024MB

代码 前台：

<form name="serForm" action="uploadFileController" method="post" enctype="multipart/form-data">
<h1>采用流的方式上传文件</h1>
<input type="file" name="file">
<input type="submit" value="upload"/>
</form>

后台：

@RestController
public class UploadFileController {

@RequestMapping("/uploadFileController")
@ResponseBody
public Map<String,Object> uploadFile(MultipartFile file) throws RuntimeException, IOException{

Map<String,Object> map = new HashMap<String, Object>();

System.out.println("fileName"+file.getOriginalFilename());

file.transferTo(new File("E:\\workspace\\190620-springbootmvc\\src\\main\\resources\\static\\"+file.getOriginalFilename()));

map.put("msg", "ok");
return map;
}
}

启动类

package com.zjx;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;

import com.zjx.filter.SecondFilter;
import com.zjx.listener.SecondListener;
import com.zjx.servlet.SecondServlet;

@SpringBootApplication
public class AppTwo {

public static void main(String[] args) {
// TODO Auto-generated method stub
SpringApplication.run(AppTwo.class, args);
}

}