文件上传

Spring Boot代码

代码结构：

Controller层

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;
    }

}

跨域拦截器配置

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);
    }
}

application.properties配置

# 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

前端页面

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>Multiple File Upload</title>
  </head>
  <body>
    <h1>Multiple File Upload</h1>
    <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>

效果展示

获取图片的url并且读取图片

修改tomcat的server.xml文件

加上下面这句

<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"