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; @RestController public 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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