本文源码 GitHub地址:知了一笑 https://github.com/cicadasmile/spring-boot-base
文件上传是项目开发中一个很常用的功能,常见的如头像上传,各类文档数据上传等。SpringBoot使用MultiPartFile接收来自表单的file文件,然后执行上传文件。该案例基于SpringBoot2.0中yml配置,管理文件上传的常见属性。该案例演示单文件上传和多文件上传。
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency>
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <body> <hr/> <h3>1、单文件上传</h3> <form method="POST" action="/upload1" enctype="multipart/form-data"> 上传人:<input type="text" name="userName" /><br/> 文件一:<input type="file" name="file" /><br/> <input type="submit" value="Submit" /> </form> <hr/> <h3>2、多文件上传</h3> <form method="POST" action="/upload2" enctype="multipart/form-data"> 上传人:<input type="text" name="userName" /><br/> 文件一:<input type="file" name="file" /><br/> 文件二:<input type="file" name="file" /><br/><br/> <input type="submit" value="Submit" /> </form> </body> </html> <hr/>
import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; @Controller public class PageController { /** * 上传页面 */ @GetMapping("/uploadPage") public String uploadPage (){ return "upload" ; } }
上传文件单个限制
max-file-size: 5MB
上传文件总大小限制
max-request-size: 6MB
spring: application: # 应用名称 name: node14-boot-file servlet: multipart: # 启用 enabled: true # 上传文件单个限制 max-file-size: 5MB # 总限制 max-request-size: 6MB
如果单个文件大小超出1MB,抛出异常
FileSizeLimitExceededException:
如果上传文件总大小超过6MB,抛出异常
SizeLimitExceededException:
这样就完全验证了YML文件中的配置,有效且正确。
import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletRequest; import java.io.File; import java.util.Map; @RestController public class FileController { private static final Logger LOGGER = LoggerFactory.getLogger(FileController.class) ; /** * 测试单个文件上传 */ @RequestMapping("/upload1") public String upload1 (HttpServletRequest request, @RequestParam("file") MultipartFile file){ Map<String, String[]> paramMap = request.getParameterMap() ; if (!paramMap.isEmpty()){ LOGGER.info("paramMap == >>{}",paramMap); } try{ if (!file.isEmpty()){ // 打印文件基础信息 LOGGER.info("Name == >>{}",file.getName()); LOGGER.info("OriginalFilename == >>{}",file.getOriginalFilename()); LOGGER.info("ContentType == >>{}",file.getContentType()); LOGGER.info("Size == >>{}",file.getSize()); // 文件输出地址 String filePath = "F:/boot-file/" ; new File(filePath).mkdirs(); File writeFile = new File(filePath, file.getOriginalFilename()); file.transferTo(writeFile); } return "success" ; } catch (Exception e){ e.printStackTrace(); return "系统异常" ; } } /** * 测试多文件上传 */ @RequestMapping("/upload2") public String upload2 (HttpServletRequest request, @RequestParam("file") MultipartFile[] fileList){ Map<String, String[]> paramMap = request.getParameterMap() ; if (!paramMap.isEmpty()){ LOGGER.info("paramMap == >>{}",paramMap); } try{ if (fileList.length > 0){ for (MultipartFile file:fileList){ // 打印文件基础信息 LOGGER.info("Name == >>{}",file.getName()); LOGGER.info("OriginalFilename == >>{}",file.getOriginalFilename()); LOGGER.info("ContentType == >>{}",file.getContentType()); LOGGER.info("Size == >>{}",file.getSize()); // 文件输出地址 String filePath = "F:/boot-file/" ; new File(filePath).mkdirs(); File writeFile = new File(filePath, file.getOriginalFilename()); file.transferTo(writeFile); } } return "success" ; } catch (Exception e){ return "fail" ; } } }
GitHub地址:知了一笑 https://github.com/cicadasmile/spring-boot-base 码云地址:知了一笑 https://gitee.com/cicadasmile/spring-boot-base