springboot+thymeleaf 文件上传功能的实现代码

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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