上传文件springboot所需的请求部分“文件"不存在

本文介绍了上传文件springboot所需的请求部分“文件"不存在的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！

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

包 org.sid.web;导入 java.io.BufferedOutputStream；导入java.io.File；导入 java.io.FileOutputStream；导入 java.io.IOException；导入 java.nio.file.Files；导入 java.nio.file.Path；导入 java.nio.file.Paths；导入 java.util.ArrayList；导入 java.util.List；导入 javax.servlet.ServletContext；导入 org.springframework.beans.factory.annotation.Autowired；导入 org.springframework.http.HttpEntity；导入 org.springframework.http.HttpHeaders；导入 org.springframework.http.HttpStatus；导入 org.springframework.http.MediaType；导入 org.springframework.http.ResponseEntity；导入 org.springframework.stereotype.Controller；导入 org.springframework.util.LinkedMultiValueMap；导入 org.springframework.web.bind.annotation.GetMapping；导入 org.springframework.web.bind.annotation.PostMapping；导入 org.springframework.web.bind.annotation.RequestMapping；导入 org.springframework.web.bind.annotation.RequestMethod；导入 org.springframework.web.bind.annotation.RequestParam；导入 org.springframework.web.bind.annotation.ResponseBody；导入 org.springframework.web.bind.annotation.RestController；导入 org.springframework.web.client.RestTemplate；导入 org.springframework.web.multipart.MultipartFile；导入 org.springframework.web.servlet.mvc.support.RedirectAttributes；导入 org.springframework.core.env.Environment；导入 org.springframework.core.io.ClassPathResource；导入 org.springframework.core.io.FileSystemResource；导入 org.sid.entities.FileInfo；@RestController公共类 UploadController {@自动连线ServletContext 上下文；@RequestMapping(value = "/fileupload/file", headers = ("content-type=multipart/*"), method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)公共响应实体<文件信息>上传(@RequestParam(文件")MultipartFile inputFile){文件信息文件信息 = 新文件信息()；HttpHeaders 标头 = 新的 HttpHeaders();if (!inputFile.isEmpty()) {尝试 {String originalFilename = inputFile.getOriginalFilename();文件目标文件 = 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);return new ResponseEntity(fileInfo, headers, HttpStatus.OK);} 捕捉(异常 e){返回新的 ResponseEntity<FileInfo>(HttpStatus.BAD_REQUEST);}} 别的 {返回新的 ResponseEntity<FileInfo>(HttpStatus.BAD_REQUEST);}}}

但是当在邮递员中插入

我的示例代码:

application.properties

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

主要应用类:

Application.java

import org.springframework.boot.SpringApplication;导入 org.springframework.boot.autoconfigure.SpringBootApplication；@SpringBootApplication公共类应用程序{公共静态无效主要(字符串[]参数){SpringApplication.run(Application.class, args);}}

Rest 控制器类:

import org.springframework.http.MediaType;导入 org.springframework.stereotype.Controller；导入 org.springframework.ui.Model；导入 org.springframework.web.bind.annotation.RequestBody；导入 org.springframework.web.bind.annotation.RequestMapping；导入 org.springframework.web.bind.annotation.RequestMethod；导入 org.springframework.web.bind.annotation.RequestParam；导入 org.springframework.web.bind.annotation.ResponseBody；导入 org.springframework.web.multipart.MultipartFile；@控制器@RequestMapping("/文件上传")公共类 MyRestController {@RequestMapping(值 = "/file", 方法 = RequestMethod.POST, 产生 = MediaType.APPLICATION_JSON_VALUE)public @ResponseBody String myService(@RequestParam("file") MultipartFile 文件，@RequestParam("id") String id) 抛出异常 {如果(！file.isEmpty()){//你的逻辑}返回一些json"；}}

pom.xml

//...<父母><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.2.RELEASE</version><相对路径/><!-- 从存储库中查找父级--></父母>……<依赖性><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web-services</artifactId></依赖>//...

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>

//...

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上传文件springboot所需的请求部分“文件"不存在

问题描述

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