我尝试使用axios从页面上载文件，但无法在控制器上获取它。在前端，我将Vue.js与axios一起使用，并在后端使用Spring MVC Controller。看来我的控制器无法在春季将FormData（）转换为MultipartFile。我读了很多问题，但没有答案。这是我的代码：
<!DOCTYPE html>
<html lang="en" xmlns:v-on="http://www.w3.org/1999/xhtml">
<head>
<meta charset="UTF-8">
<title>Title</title>
<!-- Vue.js development version, includes helpful console warnings -->
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<!--Axios dependency-->
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<!--Bootstrap-->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
</head>
<body>
<h4>Uploading files with Vue.js</h4>
<div id="uploadSingle" class="container">
<h5>Single file uploading</h5>
<div class="large-12 medium-12 small-12 cell">
<div class="form-row" >
<div class="col-md-4 mb-3">
<input type="file" ref="file" id="customFile"
v-on:change="handleFileUpload($event)"
class="custom-file-input"
enctype="multipart/form-data">
<label class="custom-file-label" for="customFile">{{chosenFile}}</label>
</div>
</div>
<button v-on:click="submitFile()" class="btn btn-primary">Submit</button>
</div>
</div>
<div id="uploadMultiple" class="container">
<h5>Multiple files uploading</h5>
</div>
<script >
var app = new Vue({
el: '#uploadSingle',
data() {
return {
message: 'Hello Vue!',
singleFile: '',
refFile: '',
chosenFile: 'Chose file'
};
},
methods:{
handleFileUpload(event){
this.singleFile = event.target.files[0];
this.chosenFile=this.singleFile.name;
},
submitFile(){
var formData = new FormData();
formData.append("file", this.singleFile);
axios.post( '/single-file',
formData,{
headers: {
'Content-Type': 'multipart/form-data'
}
}
).then(function(){console.log('SUCCESS!')})
.catch((error) => console.log( error ) )
},
},
})
</script>
</body>
</html>
和控制器文件：
package com.yurets_y.webdevelopment_uploading_file_with_vue.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import java.io.IOException;
@CrossOrigin("*")
@Controller
public class UploadController {
@Value("${upload.path}")
private String uploadPath;
@ResponseBody
@PostMapping(value="/single-file", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public ResponseEntity<?> uploadSingle(
@RequestParam(name="file", required = false) MultipartFile file
) {
System.out.println("uploaded");
System.out.println(file);
return ResponseEntity.ok().build();
}
}
我将非常感谢您的建议。
P.S。当我使用@RequestParam（name =“ file”，required = true）MultipartFile文件时，出现错误POSThttp://localhost:8080/single-file400（错误请求），看来spring无法从FormData获取MultipartFile文件。在后端我没有任何错误，只有MultipartFile file = null
@PostMapping(path = "/single-file", headers = "content-type=multipart/*")name更改为value