springboot+thymeleaf 文件上传功能的实现代码
weize_hh 人气:1pom.xml
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>
application.yml
spring: servlet: multipart: #上传文件总的最大值 max-request-size: 10MB #上传文件的最大值 max-file-size: 10MB
index.html 文件上传页面
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>文件上传</title> </head> <body> <p>单文件上传</p> <form method="post" action="/upload" enctype="multipart/form-data"> <p><input type="file" name="file00"></p> <p><span th:text="${msg}"></span></p> <input type="submit" value="提交"> </form> <hr/> <p>多文件上传</p> <form method="post" enctype="multipart/form-data" action="/batch"> <p>文件1:<input type="file" name="file"/></p> <p>文件2:<input type="file" name="file"/></p> <p><input type="submit" value="上传"/></p> </form> </body> </html>
hello.html 上传成功的页面
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <p>单文件上传</p> <p th:text="${msg}"></p> <hr> <p>多文件上传</p> <ul> <li th:each="msg1:${msgList}" th:text="${msg1}"></li> </ul> </body> </html>
controller: 文件上传
import org.springframework.core.io.ResourceLoader; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.util.ResourceUtils; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartRequest; import javax.servlet.http.HttpServletRequest; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.UUID; @Controller public class FileUploadController { //单一文件上传 @RequestMapping("/upload") public String uploadFile(@RequestParam("file00") MultipartFile file, Model model){ String msg=""; try { if(file.isEmpty()){ model.addAttribute("msg","上传失败,请选择文件!"); return "index"; } String filename = file.getOriginalFilename(); //String filePath = request.getServletContext().getRealPath("/upload"); String filePath = ResourceUtils.getURL("classpath:").getPath()+"static/"; //避免文件重复覆盖 String uuid= UUID.randomUUID().toString().replaceAll("-", ""); //时间戳分类文件 String time = new SimpleDateFormat("YYYY-MM").format(new Date()); String realPath = filePath+time+"/"+uuid+filename; File dest = new File(realPath); //检测是否存在目录,无,则创建 if(!dest.getParentFile().exists()){ dest.getParentFile().mkdirs();//新建文件夹 多级目录 } file.transferTo(dest);//文件写入 } catch (IOException e) { e.printStackTrace(); } model.addAttribute("msg","文件上传成功!"); return "hello"; } //多文件上传 @RequestMapping("/batch") public String uploadMoreFiles(HttpServletRequest request, Model model){ MultipartRequest request1 = (MultipartRequest)request; //猜测 file为 input 类型为 file List<MultipartFile> fileList = request1.getFiles("file"); List<String> msgList = new ArrayList<>(); System.out.println(fileList.size()); try { String filepath = ResourceUtils.getURL("classpath:").getPath()+"static/"; for (int i=1;i<=fileList.size();i++){ MultipartFile file = fileList.get(i-1); if (file.isEmpty()){ msgList.add("上传第"+i+"个文件失败"); model.addAttribute("msgList",msgList); continue; } String filename = file.getOriginalFilename(); //避免文件重复覆盖 String uuid= UUID.randomUUID().toString().replaceAll("-", ""); //时间戳分类文件 String time = new SimpleDateFormat("YYYY-MM").format(new Date()); String realPath = filepath+time+"s/"+uuid+filename; File dest = new File(realPath); //System.out.println("realPath"+realPath); //检测是否存在目录,无,则创建 if(!dest.getParentFile().exists()){ dest.getParentFile().mkdirs();//新建文件夹 多级目录 } msgList.add("第"+i+"个文件,上传成功!"); file.transferTo(dest); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } model.addAttribute("msgList",msgList); return "hello"; } }
测试:
注:目前仅实现了文件的上传
计划补充:文件下载+上传的图片展示;
上传的图片展示:
遇到的问题: 直接使用 realPath 作为图片拼接地址 浏览器报 安全错误
使用字符串拼接,也会报错404
index = realPath.lastIndexOf("static"); upFilePaths.add("../"+realPath.substring(index));
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