通过angular 5将文件对象发送到Spring Rest控制器 [英] Sending file object to Spring Rest controller through angular 5
问题描述
我正在尝试在客户端上传文件,并将HTTP Post请求发送到Spring Rest Controller.但是,当我在Rest控制器中收到文件对象时,我可以将其视为空". HTML代码:
I am trying to upload a file on client side and send HTTP Post request to Spring Rest Controller. But when I receive the file object in Rest controller I could see it as 'null'. HTML code :
<input type="file" id="myFile" (change) = "onFileChange($event)" #fileInput>
对应的.ts文件:
onFileChange($event) : void {
let file:File = $event.target.files[0];
let myReader: FileReader = new FileReader();
myReader.onloadend = function(e) {
}
myReader.readAsText(file);
const req = this.http.post('/abc',myReader.result, {
headers: new HttpHeaders().set('content-type','application/pdf')
});
req.subscribe(
(data) => {
console.log(data);
},
(err: HttpErrorResponse) => {
if(err.error instanceof Error) {
//client side error
console.log('An error occured: ',err.error.message);
} else {
console.log('Backend returned code', err.status, 'body was ',err.error);
}
}
)
}
我的Spring Rest控制器:
My Spring Rest Controller :
@RequestMapping(value="/abc", method = RequestMethod.POST, consumes = "application/pdf")
public ResponseEntity<String> uploadFile(@RequestBody MultipartFile file) {
System.out.println("Inside Controller");
return new ResponseEntity<>("true", HttpStatus.CREATED);
}
任何人都可以在这里帮助找到问题.
Could anyone please help to find out the issue here.
推荐答案
尝试以下代码
HTML模板
<input type="file" id="myFile" (change)="onFileChange(fileInput.files)" #fileInput>
TypeScript
import { Headers, RequestOptions } from '@angular/http'; // Import header and requestOptions
//On File Select
onFileChange(files: any) {
let file: File = files[0];
let headers = new Headers();
let options = new RequestOptions({ headers: headers }); // Create header
let formData = new FormData();
formData.append('file', file); // Append file to formdata
const req = this.http.post('/abc', formData, options);
req.subscribe( (data) => {
console.log(data); // Sucess response
}, (err: HttpErrorResponse) => {
// Erro response
if(err.error instanceof Error) {
//client side error
console.log('An error occured: ',err.error.message);
}
else {
console.log('Backend returned code', err.status, 'body was ',err.error);
}
})
}
Spring Controller
@RequestMapping(value="/abc", method = RequestMethod.POST)
public ResponseGenerator uploadFile(@RequestParam MultipartFile file) {
ResponseGenerator responseGenerator = new ResponseGenerator();
try {
if (file != null) {
System.out.println(file.getOriginalFilename());
}
return responseGenerator;
} catch (Exception e) {
logger.error("Error while updating user : ", e);
return responseGenerator;
}
}
如果创建一个service
并将http
方法code
放入该service
中,则将是更好的方法.请参阅此链接 Angular 2模板输入type = file和spring boot的表单
It will be better way if you create one service
and put your http
method code
in that service
. refer this link Angular 2 template form with input type=file and spring boot
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