邮差:所需的请求部分'文件'不存在

Question

我想通过邮递员将图像上传到我的Rest API.我正在使用spring boot框架.这是屏幕截图:

我也没有像我在其他堆栈溢出答案中找到的那样设置任何头文件,因为它给出了多部分边界错误.

现在,下面是我的控制器代码:

package com.practice.rest.assignment1.controller;

import java.io.IOException;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
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.RestController;
import org.springframework.web.multipart.MultipartFile;
import com.practice.rest.assignment1.model.Product;
import com.practice.rest.assignment1.service.CatalogueService;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;

@RestController
@RequestMapping("/CatalogueController/")
public class CatalogueController{

    @Autowired
    private CatalogueService catalogueService;

    @RequestMapping(value = "addProduct", method = RequestMethod.POST , consumes = "multipart/form-data")
    public Product addProduct(@RequestParam String productJson, @RequestParam MultipartFile file) throws JsonParseException, JsonMappingException, IOException {


        Product product = new ObjectMapper().readValue(productJson, Product.class);
        byte[] mediaBytes = file.getBytes();
        product.setImage(mediaBytes);
        return catalogueService.saveInDb(product);

    }

}

现在,我正在使用一个Product对象,该对象内部包含一个定义为byte []数组的图像.我把它作为字符串和图像分别作为Multipart文件.

以下是我定义的产品类属性:

    private Long pId;
    private String model;
    private String brand;
    private byte[] image; // This is where I want the image to save
    private Long price;
    private String currency;
    private String transmissionType;
    private String fuelType;

既然,我正在使用spring boot,这是我的Main类:

package com.practice.rest.assignment1;

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


@SpringBootApplication
public class App {

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

}

我得到的邮差错误是:

{
  "timestamp": 1478611635977,
  "status": 400,
  "error": "Bad Request",
  "exception": "org.springframework.web.multipart.support.MissingServletRequestPartException",
  "message": "Required request part 'file' is not present",
  "path": "/CatalogueController/addProduct"
}

我哪里错了？

Answer 1

尝试删除'Content-Type: multipart/form-data...'标题的 , 部分。它为我解决了这个问题。

Answer 2

我认为问题出在您发送的 JSON 参数上。在邮递员中，您不需要放置开头和结尾的“来将参数表示为字符串。而且，如果您使用开头和结尾“，那么在JSON（对于JSON对象意味着属性键和值）中，您应该使用'（单引号）。