文件上传SpringBoot后端MultipartFile参数报空问题的解决办法
最近写了一个文件上传的小demo，就是简单的前端html页面，后端controller接收，但是后端一直报错文件为null，看了很多文章，有说spring-boot自带的org.springframework.web.multipart.MultipartFile和Multipart冲突了，要在启动类中加入@EnableAutoConfiguration(exclue={MultipartAutoConfiguration.class})，有说要在MultipartFile参数前加上@RequestParam(“file”)以表明该参数类型是文件类型，还有说是前端表单没有设置enctype=“multipart/form-data”，参照上面方法我还是没有解决问题，后来更换了spring-boot版本就好了，代码如下：
1、pom.xml(注意我这里用的是2.0.4版本)
<?xml version='1.0' encoding='UTF-8'?><project xmlns='http://maven.apache.org/POM/4.0.0' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd'> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.4.RELEASE</version> </parent> <groupId>org.sang</groupId> <artifactId>chapter01</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> <build> <plugins> <plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>
2、upload.html页面
<!DOCTYPE html><html lang='en'><head> <meta charset='UTF-8'> <title>Title</title></head><body><form action='/upload' method='post' enctype='multipart/form-data'> <input type='file' name='uploadFile' value='请选择文件'> <input type='submit' value='上传'></form></body></html>
3、后端controller
import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.multipart.MultipartFile;import javax.servlet.http.HttpServletRequest;import java.io.File;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.UUID;@RestControllerpublic class FileUploadController { SimpleDateFormat sdf = new SimpleDateFormat('yyyy/MM/dd'); @PostMapping('upload') public String upload(MultipartFile uploadFile, HttpServletRequest req){ String realPath = req.getSession().getServletContext().getRealPath('/uploadFile'); String format = sdf.format(new Date()); File folder = new File(realPath+format); if(!folder.isDirectory()){ folder.mkdirs(); } String oldName = uploadFile.getOriginalFilename(); String newName = UUID.randomUUID().toString()+oldName.substring(oldName.lastIndexOf('.'),oldName.length()); try{ uploadFile.transferTo(new File(folder,newName)); String path = req.getScheme()+'://'+req.getServerName()+':'+req.getServerPort()+'/uploadFile/'+format+newName; return path; }catch (IOException e){ e.printStackTrace(); } return '上传失败'; }}
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