上传文件springboot所需的请求部分“文件”不存在 [英] upload file springboot Required request part 'file' is not present

问题描述

我想在我的spring boot应用程序中添加一个上传功能；
这是我上传的Rest Controller

  package org.sid.web; 
 
 import java.io.BufferedOutputStream; 
 import java.io.File; 
 import java.io.FileOutputStream; 
 import java.io.IOException; 
 import java.nio.file.Files; 
 import java.nio.file.Path; 
 import java.nio.file.Paths; 
 import java.util.ArrayList; 
 import java.util.List; 
 
 import javax.servlet.ServletContext; 
 
导入org.springframework.beans.factory.annotation.Autowired; 
 import org.springframework.http.HttpEntity; 
 import org.springframework.http.HttpHeaders; 
 import org.springframework.http.HttpStatus; 
 import org.springframework.http.MediaType; 
 import org.springframework.http.ResponseEntity; 
 import org.springframework.stereotype.Controller; 
 import org.springframework.util.LinkedMultiValueMap; 
 import org.springframework.web.bind.annotation.GetMapping; 
 import org.springframework.web.bind.annotation.PostMapping; 
 import org.springframework.web.bind.annotation.RequestMapping; 
 import org.springframework.web.bind.annotation.RequestMethod; 
 import org.springframework.web.bind.annotation.RequestParam; 
 import org.springframework.web.bind.annotation.ResponseBody; 
 import org.springframework.web.bind.annotation.RestController; 
 import org.springframework.web.client.RestTemplate; 
 import org.springframework.web.multipart.MultipartFile; 
 import org.springframework.web.servlet.mvc.support.RedirectAttributes; 
 import org.springframework.core.env.Environment; 
 import org.springframework.core.io.ClassPathResource; 
 import org.springframework.core.io.FileSystemResource; 
 import org.sid.entities.FileInfo; 
 
 @RestController 
公共类UploadController {
 @Autowired 
 ServletContext上下文； 
 
 @RequestMapping（值= / fileupload / file，标头=（ content-type = multipart / *），方法= RequestMethod.POST，消耗= MediaType.MULTIPART_FORM_DATA_VALUE）
公共ResponseEntity< FileInfo> upload（@RequestParam（ file）MultipartFile inputFile）{
 FileInfo fileInfo = new FileInfo（）; 
 HttpHeaders标头= new HttpHeaders（）; 
 if（！inputFile.isEmpty（））{
 try {
 String originalFilename = inputFile.getOriginalFilename（）; 
文件destinationFile =新文件（
 context.getRealPath（ C：/ Users / kamel / workspace / credit_app / uploaded）+ File.separator + originalFilename）; 
 inputFile.transferTo（destinationFile）; 
 fileInfo.setFileName（destinationFile.getPath（））; 
 fileInfo.setFileSize（inputFile.getSize（））; 
 headers.add（文件上传成功-，originalFilename）; 
返回新的ResponseEntity< FileInfo>（fileInfo，标头，HttpStatus.OK）; 
} catch（Exception e）{
返回新的ResponseEntity< FileInfo>（HttpStatus.BAD_REQUEST）; 
} 
} else {
返回新的ResponseEntity< FileInfo>（HttpStatus.BAD_REQUEST）; 
} 
} 
} 
  

但是在邮递员中进行测试时插入

我的示例代码：

application.properties

  #max文件和请求大小
 spring.http.multipart.max-file- size = 10MB 
 spring.http.multipart.max-request-size = 11MB 
  

Main应用分类屁股：

Application.java

  import org.springframework.boot.SpringApplication; 
 import org.springframework.boot.autoconfigure.SpringBootApplication; 
 
 @SpringBootApplication 
公共类应用程序{
 
 public static void main（String [] args）{
 SpringApplication.run（Application.class，args ）; 
} 
} 
  

其他控制器类：

  import org.springframework.http.MediaType; 
 import org.springframework.stereotype.Controller; 
 import org.springframework.ui.Model; 
 import org.springframework.web.bind.annotation.RequestBody; 
 import org.springframework.web.bind.annotation.RequestMapping; 
 import org.springframework.web.bind.annotation.RequestMethod; 
 import org.springframework.web.bind.annotation.RequestParam; 
 import org.springframework.web.bind.annotation.ResponseBody; 
 import org.springframework.web.multipart.MultipartFile; 
 
 
 @Controller 
 @RequestMapping（ / fileupload）
公共类MyRestController {
 
 @RequestMapping（value = / file ，方法= RequestMethod.POST，产生= MediaType.APPLICATION_JSON_VALUE）
 public @ResponseBody String myService（@RequestParam（ file）MultipartFile文件，
 @RequestParam（ id）字符串ID）引发异常{
 
 if（！file.isEmpty（））{
 
 //您的逻辑
} 
返回 some json； 
 
} 
} 
  

pom .xml

  // ... 
 
< parent> ; 
< groupId> org.springframework.boot< / groupId> 
< artifactId> spring-boot-starter-parent< / artifactId> 
< version> 1.5.2.RELEASE< / version> 
< relativePath /> <！-从存储库中查找父级-> 
< / parent> 
 
 .... 
 
 
 
<依赖关系> 
< groupId> org.springframework.boot< / groupId> 
< artifactId> spring-boot-starter-web-services< / artifactId> 
< / dependency> 
 
 // ... 
  

I want to add an upload function to my spring boot application; this is my upload Rest Controller

package org.sid.web;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletContext;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.FileSystemResource;
import org.sid.entities.FileInfo;

@RestController
public class UploadController {
  @Autowired
  ServletContext context;

  @RequestMapping(value = "/fileupload/file", headers = ("content-type=multipart/*"), method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
  public ResponseEntity<FileInfo> upload(@RequestParam("file") MultipartFile inputFile) {
    FileInfo fileInfo = new FileInfo();
    HttpHeaders headers = new HttpHeaders();
    if (!inputFile.isEmpty()) {
      try {
        String originalFilename = inputFile.getOriginalFilename();
        File destinationFile = new File(
            context.getRealPath("C:/Users/kamel/workspace/credit_app/uploaded") + File.separator + originalFilename);
        inputFile.transferTo(destinationFile);
        fileInfo.setFileName(destinationFile.getPath());
        fileInfo.setFileSize(inputFile.getSize());
        headers.add("File Uploaded Successfully - ", originalFilename);
        return new ResponseEntity<FileInfo>(fileInfo, headers, HttpStatus.OK);
      } catch (Exception e) {
        return new ResponseEntity<FileInfo>(HttpStatus.BAD_REQUEST);
      }
    } else {
      return new ResponseEntity<FileInfo>(HttpStatus.BAD_REQUEST);
    }
  }
}

but when testing this in postman with inserting http://localhost:8082/fileupload/file and adding a file to the body i got this error: "exception": "org.springframework.web.multipart.support.MissingServletRequestPartException", "message": "Required request part 'file' is not present",

解决方案

This is how your request in Postman should look like:

My sample code:

application.properties

#max file and request size 
spring.http.multipart.max-file-size=10MB
spring.http.multipart.max-request-size=11MB

Main Application Class:

Application.java

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Rest controller class:

import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;


    @Controller
    @RequestMapping("/fileupload")
    public class MyRestController {

    @RequestMapping(value = "/file", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
        public @ResponseBody String myService(@RequestParam("file") MultipartFile file,
                @RequestParam("id") String id) throws Exception {

    if (!file.isEmpty()) { 

           //your logic
                        }
return "some json";

                }
    }

pom.xml

//...

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

....



<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web-services</artifactId>
</dependency>

//...

这篇关于上传文件springboot所需的请求部分“文件”不存在的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！