SpringBoot上传文件并配置本地资源映射来访问文件的实例代码
1.准备工作
1、新建一个SpringBoot项目加上web依赖, 所有依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.thymeleaf</groupId> <artifactId>thymeleaf-spring5</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency>
2、application.properties
# 上传文件总的最大值 spring.servlet.multipart.max-request-size=10MB #spring.servlet.multipart.max-request-size=10KB # 单个文件的最大值 spring.servlet.multipart.max-file-size=10MB #spring.servlet.multipart.max-file-size=10KB # 文件上传路径, 当前项目根目录下的 uploadFile 目录 pro.uploadPath=uploadFile
3、新建文件上传的静态文件 index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>文件上传</title> </head> <body> <h1>文件上传</h1> <form method="post" action="/file/upload" enctype="multipart/form-data"> <input type="file" name="file"><br> <input type="submit" value="提交"> </form> </body> </html>
2. 配置本地资源映射路径 addResourceHandlers
package com.pro.conf; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; @Configuration public class WebMvcConf implements WebMvcConfigurer { @Value("${pro.uploadPath}") private String uploadPath; @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler(uploadPath + "/**") // 添加访问路径 // file: 当前项目根目录, 映射到真实的路径下的 uploadPath(变量)目录下 .addResourceLocations("file:" + uploadPath + "/"); } }
3.上传代码
package com.pro.controller; import org.springframework.beans.factory.annotation.Value; import org.springframework.util.ResourceUtils; import org.springframework.web.bind.annotation.*; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import javax.servlet.http.HttpServletRequest; import java.io.*; import java.text.SimpleDateFormat; import java.util.*; @RestController public class UploadController { @Value("${pro.uploadPath}") private String uploadPath; /** * 获取文件路径 * @param request 请求体 * @param fileName 文件名称 * @return 文件路径 */ public String getUploadPath(HttpServletRequest request, String fileName) { return request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + "/" + uploadPath + "/" + fileName; } // 文件上传, 上传到当前项目根目录下的 uploadFile 目录 @RequestMapping("/file/upload") public Object upload(@RequestParam("file") MultipartFile multipartFile, HttpServletRequest request) { Map<String, Object> map = new HashMap(); map.put("msg", "上传成功"); if (multipartFile.isEmpty()) { map.put("msg", "空文件"); return map; } // 获取文件名 String fileName = multipartFile.getOriginalFilename(); if ("".equals(fileName)) { map.put("msg", "文件名不能为空"); return map; } System.out.println("上传文件原始的名字: " + fileName); // 使用uuid生成新文件名 String newFileName = UUID.randomUUID().toString().replaceAll("-", "") + fileName.substring(fileName.lastIndexOf("."), fileName.length()); System.out.println("保存的文件的新名字: " + newFileName); // 获取年月日的日期格式 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd"); String format = simpleDateFormat.format(new Date()); // 生成以日期分割的文件路径 File readPath = new File(uploadPath + File.separator + format); System.out.println("存放的文件夹: " + readPath); System.out.println("存放文件的绝对路径: " + readPath.getAbsolutePath()); // 判断文件夹是否存在 if (!readPath.isDirectory()) { // 创建文件夹 readPath.mkdirs(); } // 文件真实的保存路径 File file = new File(readPath.getAbsolutePath() + File.separator + newFileName); try { multipartFile.transferTo(file); // 获取存储路径 String filePath = getUploadPath(request, format + "/" + newFileName); map.put("path", filePath); } catch (IOException e) { e.printStackTrace(); map.put("msg", "上传失败"); } return map; } }
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