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本文介紹了上傳文件springboot所需的請求部分“文件"不存在的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

我想在我的 Spring Boot 應用程序中添加一個上傳功能；這是我上傳的 Rest Controller

包 org.sid.web;導入 java.io.BufferedOutputStream；導入java.io.File；導入 java.io.FileOutputStream；導入 java.io.IOException；導入 java.nio.file.Files；導入 java.nio.file.Path；導入 java.nio.file.Paths；導入 java.util.ArrayList；導入 java.util.List；導入 javax.servlet.ServletContext；導入 org.springframework.beans.factory.annotation.Autowired；導入 org.springframework.http.HttpEntity；導入 org.springframework.http.HttpHeaders；導入 org.springframework.http.HttpStatus；導入 org.springframework.http.MediaType；導入 org.springframework.http.ResponseEntity；導入 org.springframework.stereotype.Controller；導入 org.springframework.util.LinkedMultiValueMap；導入 org.springframework.web.bind.annotation.GetMapping；導入 org.springframework.web.bind.annotation.PostMapping；導入 org.springframework.web.bind.annotation.RequestMapping；導入 org.springframework.web.bind.annotation.RequestMethod；導入 org.springframework.web.bind.annotation.RequestParam；導入 org.springframework.web.bind.annotation.ResponseBody；導入 org.springframework.web.bind.annotation.RestController；導入 org.springframework.web.client.RestTemplate；導入 org.springframework.web.multipart.MultipartFile；導入 org.springframework.web.servlet.mvc.support.RedirectAttributes；導入 org.springframework.core.env.Environment；導入 org.springframework.core.io.ClassPathResource；導入 org.springframework.core.io.FileSystemResource；導入 org.sid.entities.FileInfo；@RestController公共類 UploadController {@自動連線ServletContext 上下文；@RequestMapping(value = "/fileupload/file", headers = ("content-type=multipart/*"), method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)公共響應實體<文件信息>上傳(@RequestParam(文件")MultipartFile inputFile){文件信息文件信息 = 新文件信息()；HttpHeaders 標頭 = 新的 HttpHeaders();if (!inputFile.isEmpty()) {嘗試 {String originalFilename = inputFile.getOriginalFilename();文件目標文件 = 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("文件上傳成功-", originalFilename);return new ResponseEntity(fileInfo, headers, HttpStatus.OK);} 捕捉(異常 e){返回新的 ResponseEntity<FileInfo>(HttpStatus.BAD_REQUEST);}} 別的 {返回新的 ResponseEntity<FileInfo>(HttpStatus.BAD_REQUEST);}}}

但是當在郵遞員中插入

我的示例代碼:

application.properties

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

主要應用類:

Application.java

import org.springframework.boot.SpringApplication;導入 org.springframework.boot.autoconfigure.SpringBootApplication；@SpringBootApplication公共類應用程序{公共靜態無效主要(字符串[]參數){SpringApplication.run(Application.class, args);}}

Rest 控制器類:

import org.springframework.http.MediaType;導入 org.springframework.stereotype.Controller；導入 org.springframework.ui.Model；導入 org.springframework.web.bind.annotation.RequestBody；導入 org.springframework.web.bind.annotation.RequestMapping；導入 org.springframework.web.bind.annotation.RequestMethod；導入 org.springframework.web.bind.annotation.RequestParam；導入 org.springframework.web.bind.annotation.ResponseBody；導入 org.springframework.web.multipart.MultipartFile；@控制器@RequestMapping("/文件上傳")公共類 MyRestController {@RequestMapping(值 = "/file", 方法 = RequestMethod.POST, 產生 = MediaType.APPLICATION_JSON_VALUE)public @ResponseBody String myService(@RequestParam("file") MultipartFile 文件，@RequestParam("id") String id) 拋出異常 {如果(！file.isEmpty()){//你的邏輯}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><相對路徑/><!-- 從存儲庫中查找父級--></父母>……<依賴性><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web-services</artifactId></依賴>//...

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,

解決方案

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>

//...

這篇關于上傳文件springboot所需的請求部分“文件"不存在的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！

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上傳文件springboot所需的請求部分“文件"不存

問題描述

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