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));
