springboot+thymeleaf 文件上传功能的实现代码
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2022-03-16 21:35:35
pom.xml org.springframework.boot
pom.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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