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How SpringBoot implements multiple file uploads

王林
王林forward
2023-05-11 16:40:063566browse

1. Code structure:

How SpringBoot implements multiple file uploads

2.Controller layer

package com.yqifei.upload.controller;

import io.swagger.annotations.Api;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

/**
 * @ClassName UploadController
 * @Description TODO
 * @Author jiangyuntao
 * @Data 2023/3/7 23:52
 * @Version 1.0
 * @Email yuntaojiang@foxmail.com
 */

@RestController
@CrossOrigin
@RequestMapping("/posts")
@Api(tags = "文件上传控制器")
public class UploadController {

/*
http://localhost:8088/swagger-ui.html#
*/
    @PostMapping(value="/upload")
    @CrossOrigin
    public List<String> fileload(@RequestParam(value = "file") MultipartFile[] file, HttpServletRequest request) throws IOException {
        System.out.println(file.length);
        String savaLaction="d:/data/";
        String fileSaveName;
        List<String> imageUri = new ArrayList<>();
        for (MultipartFile multipartFile:file) {
            System.out.println("文件"+multipartFile.getOriginalFilename());
            fileSaveName = UUID.randomUUID().toString()+multipartFile.getOriginalFilename();
            multipartFile.transferTo(new File(savaLaction,fileSaveName));
            String res = request.getScheme()+"://"+request.getServerName()+":"+"8080"+savaLaction+"/"+fileSaveName;
            imageUri.add(res);
        }
        System.out.println(imageUri);
        return imageUri;
    }

}

3. Cross-domain interceptor configuration

package com.yqifei.upload.utils;

import org.springframework.context.annotation.Configuration;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebFilter(filterName = "CorsFilter")
@Configuration
public class CorsFilter implements Filter {
    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;
        response.setHeader("Access-Control-Allow-Origin","*");
        response.setHeader("Access-Control-Allow-Credentials", "true");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, PATCH, DELETE, PUT");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
        chain.doFilter(req, res);
    }
}

4. application.properties configuration

# 应用名称
spring.application.name=upload
# 应用服务 WEB 访问端口
server.port=8088

spring.web.resources.static-locations=file:d:/data/

spring.servlet.multipart.max-request-size=50MB
spring.servlet.multipart.max-file-size=50MB

5. Front-end page

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>Multiple File Upload</title>
  </head>
  <body>
    <h2>Multiple File Upload</h2>
    <form>
      <input type="file" id="fileInput" multiple />
      <button type="button" onclick="uploadFiles()">Upload</button>
    </form>
    <div id="progress"></div>
    <div>图片返回值地址：</div>
    <div id="result"></div>
  </body>
  <script>
    function uploadFiles() {
      const files = document.getElementById("fileInput").files;
      const xhr = new XMLHttpRequest();
      const formData = new FormData();

      for (let i = 0; i < files.length; i++) {
        formData.append("file", files[i]);
      }

      xhr.open("POST", "http://localhost:8088/posts/upload");
      xhr.upload.addEventListener("progress", function (event) {
        if (event.lengthComputable) {
          const percent = Math.round((event.loaded / event.total) * 100);
          const progress = document.getElementById("progress");
          progress.innerHTML = "Upload progress: " + percent + "%";
        }
      });
      xhr.addEventListener("load", function (event) {
        const response = JSON.parse(event.target.responseText);
        console.log(response);
        // 在HTML页面上找到需要显示响应结果的元素
        const resultElement = document.getElementById("result");
        // 更新元素的文本内容为服务器返回的值
        resultElement.textContent = response;
      });
      xhr.send(formData);
    }
  </script>
</html>

6. Effect display

How SpringBoot implements multiple file uploads

7. Get the url of the image and read it Picture

How SpringBoot implements multiple file uploads

Modify tomcat’s server.xml file

How SpringBoot implements multiple file uploads

Add the following sentence

<Context docBase ="/home/springbootVue/files" path ="/home/springbootVue/files" debug ="0" reloadable ="true"/>
// 	docBase代表文件路径，path是浏览器访问时的路径。
// 若自己创建的文件夹在tomcat目录的webapps中,不同之处： docBase直接写文件夹文字即可（注意：没有/） 例如 docBase ="home/springbootVue/files"

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