postman中几种传参方式区别：
1.form-data
form-data主要是以键值对的形式来上传参数，同时参数之间以&分隔符分开，同时也可以上传文件，文件上传要指定文件类型,具体可以看下面的图。

2.x-www-form-urlencode
这种参数的传递与form-data最大的区别是，x-www-form-urlencode只能是以键值对的形式传参，不能上传文件。

3.raw
这个比较强大，可以上传任意格式文件，具体的可以上传text文本文件、json文件、xml文件、html文件等。

4.binary
这种只能上传二进制文件，就是通常所说的文本文件。具体可以参见下图。

然后上次在用java实现一个向后台传参的形式时，在postman里以form-data的形式传参，我就尝试利用map进行数据的的封装Map<String,String>，结果发现后台无法正确解析参数。是因为map封装后并不是以&链接的。需要传递的参数和参数形式如下所示：

利用spring来作为后端框架，form-data利用LinkedMultiValueMap对象来包装多个参数，参数以key-value形式，中间以&连接。利用java代码的实现如下：

public ResponseData baseApi(String args,String bizContent){
        if(args == null || args.equals("")){
            ResponseData responseData = new ResponseData(false,"the param methodArg is null","");
            return responseData;
        }
        if(bizContent == null || bizContent.equals("")){
            ResponseData responseData = new ResponseData(false,"the param bizContent is null","");
            return responseData;
        }
            String apiUrl = Contants.publicUrl  +"/"+ args;
            HttpHeaders headers = new HttpHeaders();
            MultiValueMap<String, String> map= new LinkedMultiValueMap<>();
            headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
            map.add("app_id", Contants.clientId);
            map.add("method",args);
            map.add("format","json");
            map.add("charset","utf-8");
            map.add("timestamp",Contants.timeStamp);
            map.add("token",Contants.accessToken);
            map.add("biz_content",bizContent);
            HttpEntity<MultiValueMap<String, String>> requestParams = new HttpEntity<>(map, headers);
            ResponseEntity<String> response = restTemplate.postForEntity(apiUrl,requestParams,String.class);
            String result =response.getBody();
            JSONObject jsStr = JSONObject.parseObject(result);
            String resultCode = jsStr.getString("code");

            if(Integer.parseInt(resultCode)!= 0){
                ResponseData responseData = new ResponseData(false,"error",result);
                return responseData;
            }

            ResponseData responseData = new ResponseData(true,"success",result);
            return responseData;
    }

Http post 发送 multipart/form-data 格式数据-Java 实现

package awesome.data.structure.http;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
 * http 工具类
 *
 * @author: 
 * @time: 2019/9/9 17:09
 * @since
 */
public class HttpUtils {
    private static final Logger LOGGER = LoggerFactory.getLogger(HttpUtils.class);
    /**
     * multipart/form-data 格式发送数据时各个部分分隔符的前缀,必须为 --
     */
    private static final String BOUNDARY_PREFIX = "--";
    /**
     * 回车换行,用于一行的结尾
     */
    private static final String LINE_END = "\r\n";

    /**
     * post 请求：以表单方式提交数据
     * <p>
     * 由于 multipart/form-data 不是 http 标准内容，而是属于扩展类型，
     * 因此需要自己构造数据结构，具体如下：
     * <p>
     * 1、首先，设置 Content-Type
     * <p>
     * Content-Type: multipart/form-data; boundary=${bound}
     * <p>
     * 其中${bound} 是一个占位符，代表我们规定的分割符，可以自己任意规定，
     * 但为了避免和正常文本重复了，尽量要使用复杂一点的内容
     * <p>
     * 2、设置主体内容
     * <p>
     * --${bound}
     * Content-Disposition: form-data; name="userName"
     * <p>
     * Andy
     * --${bound}
     * Content-Disposition: form-data; name="file"; filename="测试.excel"
     * Content-Type: application/octet-stream
     * <p>
     * 文件内容
     * --${bound}--
     * <p>
     * 其中${bound}是之前头信息中的分隔符，如果头信息中规定是123，那这里也要是123；
     * 可以很容易看到，这个请求提是多个相同部分组成的：
     * 每一部分都是以--加分隔符开始的，然后是该部分内容的描述信息，然后一个回车换行，然后是描述信息的具体内容；
     * 如果传送的内容是一个文件的话，那么还会包含文件名信息以及文件内容类型。
     * 上面第二部分是一个文件体的结构，最后以--分隔符--结尾，表示请求体结束
     *
     * @param urlStr      请求的url
     * @param filePathMap key 参数名，value 文件的路径
     * @param keyValues   普通参数的键值对
     * @param headers
     * @return
     * @throws IOException
     */
    public static HttpResponse postFormData(String urlStr, Map<String, String> filePathMap, Map<String, Object> keyValues, Map<String, Object> headers) throws IOException {
        HttpResponse response;
        HttpURLConnection conn = getHttpURLConnection(urlStr, headers);
        //分隔符，可以任意设置，这里设置为 MyBoundary+ 时间戳（尽量复杂点，避免和正文重复）
        String boundary = "MyBoundary" + System.currentTimeMillis();
        //设置 Content-Type 为 multipart/form-data; boundary=${boundary}
        conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

        //发送参数数据
        try (DataOutputStream out = new DataOutputStream(conn.getOutputStream())) {
            //发送普通参数
            if (keyValues != null && !keyValues.isEmpty()) {
                for (Map.Entry<String, Object> entry : keyValues.entrySet()) {
                    writeSimpleFormField(boundary, out, entry);
                }
            }
            //发送文件类型参数
            if (filePathMap != null && !filePathMap.isEmpty()) {
                for (Map.Entry<String, String> filePath : filePathMap.entrySet()) {
                    writeFile(filePath.getKey(), filePath.getValue(), boundary, out);
                }
            }

            //写结尾的分隔符--${boundary}--,然后回车换行
            String endStr = BOUNDARY_PREFIX + boundary + BOUNDARY_PREFIX + LINE_END;
            out.write(endStr.getBytes());
        } catch (Exception e) {
            LOGGER.error("HttpUtils.postFormData 请求异常！", e);
            response = new HttpResponse(500, e.getMessage());
            return response;
        }

        return getHttpResponse(conn);
    }

    /**
     * 获得连接对象
     *
     * @param urlStr
     * @param headers
     * @return
     * @throws IOException
     */
    private static HttpURLConnection getHttpURLConnection(String urlStr, Map<String, Object> headers) throws IOException {
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        //设置超时时间
        conn.setConnectTimeout(50000);
        conn.setReadTimeout(50000);
        //允许输入流
        conn.setDoInput(true);
        //允许输出流
        conn.setDoOutput(true);
        //不允许使用缓存
        conn.setUseCaches(false);
        //请求方式
        conn.setRequestMethod("POST");
        //设置编码 utf-8
        conn.setRequestProperty("Charset", "UTF-8");
        //设置为长连接
        conn.setRequestProperty("connection", "keep-alive");

        //设置其他自定义 headers
        if (headers != null && !headers.isEmpty()) {
            for (Map.Entry<String, Object> header : headers.entrySet()) {
                conn.setRequestProperty(header.getKey(), header.getValue().toString());
            }
        }

        return conn;
    }

    private static HttpResponse getHttpResponse(HttpURLConnection conn) {
        HttpResponse response;
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()))) {
            int responseCode = conn.getResponseCode();
            StringBuilder responseContent = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                responseContent.append(line);
            }
            response = new HttpResponse(responseCode, responseContent.toString());
        } catch (Exception e) {
            LOGGER.error("获取 HTTP 响应异常！", e);
            response = new HttpResponse(500, e.getMessage());
        }
        return response;
    }

    /**
     * 写文件类型的表单参数
     *
     * @param paramName 参数名
     * @param filePath  文件路径
     * @param boundary  分隔符
     * @param out
     * @throws IOException
     */
    private static void writeFile(String paramName, String filePath, String boundary,
                                  DataOutputStream out) {
        try (BufferedReader fileReader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath)))) {
            /**
             * 写分隔符--${boundary}，并回车换行
             */
            String boundaryStr = BOUNDARY_PREFIX + boundary + LINE_END;
            out.write(boundaryStr.getBytes());
            /**
             * 写描述信息(文件名设置为上传文件的文件名)：
             * 写 Content-Disposition: form-data; name="参数名"; filename="文件名"，并回车换行
             * 写 Content-Type: application/octet-stream，并两个回车换行
             */
            String fileName = new File(filePath).getName();
            String contentDispositionStr = String.format("Content-Disposition: form-data; name=\"%s\"; filename=\"%s\"", paramName, fileName) + LINE_END;
            out.write(contentDispositionStr.getBytes());
            String contentType = "Content-Type: application/octet-stream" + LINE_END + LINE_END;
            out.write(contentType.getBytes());

            String line;
            while ((line = fileReader.readLine()) != null) {
                out.write(line.getBytes());
            }
            //回车换行
            out.write(LINE_END.getBytes());
        } catch (Exception e) {
            LOGGER.error("写文件类型的表单参数异常", e);
        }
    }

    /**
     * 写普通的表单参数
     *
     * @param boundary 分隔符
     * @param out
     * @param entry    参数的键值对
     * @throws IOException
     */
    private static void writeSimpleFormField(String boundary, DataOutputStream out, Map.Entry<String, Object> entry) throws IOException {
        //写分隔符--${boundary}，并回车换行
        String boundaryStr = BOUNDARY_PREFIX + boundary + LINE_END;
        out.write(boundaryStr.getBytes());
        //写描述信息：Content-Disposition: form-data; name="参数名"，并两个回车换行
        String contentDispositionStr = String.format("Content-Disposition: form-data; name=\"%s\"", entry.getKey()) + LINE_END + LINE_END;
        out.write(contentDispositionStr.getBytes());
        //写具体内容：参数值，并回车换行
        String valueStr = entry.getValue().toString() + LINE_END;
        out.write(valueStr.getBytes());
    }

    public static void main(String[] args) throws IOException {
        //请求 url
        String url = "http://127.0.0.1:8080/settlement/createTaskSettlement";

        // keyValues 保存普通参数
        Map<String, Object> keyValues = new HashMap<>();
        String taskDescription = "众包测试";
        String taskExpiredTime = "2019-09-12";
        String taskRequirement = "1";
        String taskTitle = "测试测试啊";
        keyValues.put("task_description", taskDescription);
        keyValues.put("task_expired_time", taskExpiredTime);
        keyValues.put("task_requirement", taskRequirement);
        keyValues.put("task_title", taskTitle);

        // filePathMap 保存文件类型的参数名和文件路径
        Map<String, String> filePathMap = new HashMap<>();
        String paramName = "file";
        String filePath = "C:\\Users\\magos\\Downloads\\Andy测试模板001.xlsx";
        filePathMap.put(paramName, filePath);

        //headers
        Map<String, Object> headers = new HashMap<>();
        //COOKIE: Name=Value;Name2=Value2
        headers.put("COOKIE", "token=OUFFNzQ0OUU5RDc1ODM0Q0M3QUM5NzdENThEN0Q1NkVEMjhGNzJGNEVGRTNCN0JEODM5NzAyNkI0OEE0MDcxNUZCMjdGNUMxMzdGRUE4MTcwRjVDNkJBRTE2ODgzQURDRjNCQjdBMTdCODc0MzA4QzFFRjlBQkM1MTA0N0MzMUU=");

        HttpResponse response = postFormData(url, filePathMap, keyValues, headers);
        System.out.println(response);

    }

    /**
     * 发送文本内容
     *
     * @param urlStr
     * @param filePath
     * @return
     * @throws IOException
     */
    public static HttpResponse postText(String urlStr, String filePath) throws IOException {
        HttpResponse response;
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "text/plain");
        conn.setDoOutput(true);
        conn.setConnectTimeout(5000);
        conn.setReadTimeout(5000);

        try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream()));
             BufferedReader fileReader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath)))) {
            String line;
            while ((line = fileReader.readLine()) != null) {
                writer.write(line);
            }

        } catch (Exception e) {
            LOGGER.error("HttpUtils.postText 请求异常！", e);
            response = new HttpResponse(500, e.getMessage());
            return response;
        }

        return getHttpResponse(conn);
    }
}


package awesome.data.structure.http;

/**
 * @author:  
 * @time: 2019/7/10 14:41
 * @since
 */
public class HttpResponse {
    private int code;
    private String content;

    public HttpResponse(int status, String content) {
        this.code = status;
        this.content = content;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String toString(){
        return new StringBuilder("[ code = ").append(code)
                .append(" , content = ").append(content).append(" ]").toString();
    }
}

 Spring Boot 文件上传与下载

参数配置

项目创建完成之后，需要设置一些必要的参数，打开项目resources目录下配置文件application.properties，在其中添加以下参数：

 

server.port=80

## MULTIPART (MultipartProperties)
# 开启 multipart 上传功能
spring.servlet.multipart.enabled=true
# 文件写入磁盘的阈值
spring.servlet.multipart.file-size-threshold=2KB
# 最大文件大小
spring.servlet.multipart.max-file-size=200MB
# 最大请求大小
spring.servlet.multipart.max-request-size=215MB

## 文件存储所需参数
# 所有通过 REST APIs 上传的文件都将存储在此目录下
file.upload-dir=./uploads

其中file.upload-dir=./uploads参数为自定义的参数，创建FileProperties.javaPOJO类，使配置参数可以自动绑定到POJO类。

 

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix = "file")
public class FileProperties {
    private String uploadDir;

    public String getUploadDir() {
        return uploadDir;
    }
    public void setUploadDir(String uploadDir) {
        this.uploadDir = uploadDir;
    }
}

然后在@SpringBootApplication注解的类中添加@EnableConfigurationProperties注解以开启ConfigurationProperties功能。

SpringBootFileApplication.java

 

@SpringBootApplication
@EnableConfigurationProperties({
        FileProperties.class
})
public class SpringBootFileApplication {

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

配置完成，以后若有file前缀开头的参数需要配置，可直接在application.properties配置文件中配置并更新FileProperties.java即可。

另外再创建一个上传文件成功之后的Response响应实体类UploadFileResponse.java及异常类FileException.java来处理异常信息。

UploadFileResponse.java

 

public class UploadFileResponse {
    private String fileName;
    private String fileDownloadUri;
    private String fileType;
    private long size;

    public UploadFileResponse(String fileName, String fileDownloadUri, String fileType, long size) {
        this.fileName = fileName;
        this.fileDownloadUri = fileDownloadUri;
        this.fileType = fileType;
        this.size = size;
    }
    // getter and setter ...
}

FileException.java

 

public class FileException extends RuntimeException{
    public FileException(String message) {
        super(message);
    }

    public FileException(String message, Throwable cause) {
        super(message, cause);
    }
}

创建接口

下面需要创建文件上传下载所需的 REST APIs 接口。创建文件FileController.java。

 

import com.james.sample.file.dto.UploadFileResponse;
import com.james.sample.file.service.FileService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

@RestController
public class FileController {

    private static final Logger logger = LoggerFactory.getLogger(FileController.class);

    @Autowired
    private FileService fileService;

    @PostMapping("/uploadFile")
    public UploadFileResponse uploadFile(@RequestParam("file") MultipartFile file){
        String fileName = fileService.storeFile(file);

        String fileDownloadUri = ServletUriComponentsBuilder.fromCurrentContextPath()
                .path("/downloadFile/")
                .path(fileName)
                .toUriString();

        return new UploadFileResponse(fileName, fileDownloadUri,
                file.getContentType(), file.getSize());
    }


    @PostMapping("/uploadMultipleFiles")
    public List<UploadFileResponse> uploadMultipleFiles(@RequestParam("files") MultipartFile[] files) {
        return Arrays.stream(files)
                .map(this::uploadFile)
                .collect(Collectors.toList());
    }

    @GetMapping("/downloadFile/{fileName:.+}")
    public ResponseEntity<Resource> downloadFile(@PathVariable String fileName, HttpServletRequest request) {
        // Load file as Resource
        Resource resource = fileService.loadFileAsResource(fileName);

        // Try to determine file's content type
        String contentType = null;
        try {
            contentType = request.getServletContext().getMimeType(resource.getFile().getAbsolutePath());
        } catch (IOException ex) {
            logger.info("Could not determine file type.");
        }

        // Fallback to the default content type if type could not be determined
        if(contentType == null) {
            contentType = "application/octet-stream";
        }

        return ResponseEntity.ok()
                .contentType(MediaType.parseMediaType(contentType))
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + resource.getFilename() + "\"")
                .body(resource);
    }
}

FileController类在接收到用户的请求后，使用FileService类提供的storeFile()方法将文件写入到系统中进行存储，其存储目录就是之前在application.properties配置文件中的file.upload-dir参数的值./uploads。

下载接口downloadFile()在接收到用户请求之后，使用FileService类提供的loadFileAsResource()方法获取存储在系统中文件并返回文件供用户下载。

FileService.java

 

import com.james.sample.file.exception.FileException;
import com.james.sample.file.property.FileProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.Resource;
import org.springframework.core.io.UrlResource;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.net.MalformedURLException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;

@Service
public class FileService {

    private final Path fileStorageLocation; // 文件在本地存储的地址

    @Autowired
    public FileService(FileProperties fileProperties) {
        this.fileStorageLocation = Paths.get(fileProperties.getUploadDir()).toAbsolutePath().normalize();
        try {
            Files.createDirectories(this.fileStorageLocation);
        } catch (Exception ex) {
            throw new FileException("Could not create the directory where the uploaded files will be stored.", ex);
        }
    }

    /**
     * 存储文件到系统
     *
     * @param file 文件
     * @return 文件名
     */
    public String storeFile(MultipartFile file) {
        // Normalize file name
        String fileName = StringUtils.cleanPath(file.getOriginalFilename());

        try {
            // Check if the file's name contains invalid characters
            if(fileName.contains("..")) {
                throw new FileException("Sorry! Filename contains invalid path sequence " + fileName);
            }

            // Copy file to the target location (Replacing existing file with the same name)
            Path targetLocation = this.fileStorageLocation.resolve(fileName);
            Files.copy(file.getInputStream(), targetLocation, StandardCopyOption.REPLACE_EXISTING);

            return fileName;
        } catch (IOException ex) {
            throw new FileException("Could not store file " + fileName + ". Please try again!", ex);
        }
    }

    /**
     * 加载文件
     * @param fileName 文件名
     * @return 文件
     */
    public Resource loadFileAsResource(String fileName) {
        try {
            Path filePath = this.fileStorageLocation.resolve(fileName).normalize();
            Resource resource = new UrlResource(filePath.toUri());
            if(resource.exists()) {
                return resource;
            } else {
                throw new FileException("File not found " + fileName);
            }
        } catch (MalformedURLException ex) {
            throw new FileException("File not found " + fileName, ex);
        }
    }
}

接口测试

在完成上述的代码之后，打开SpringBootFileApplication.java并运行，运行完成之后就可以使用 Postman 进行测试了。

单个文件上传结果：

 

多个文件上传结果：

 

 参照： https://github.com/JemGeek/spring-boot-sample/tree/master/spring-boot-file-upload

Spring Cloud Feign的文件上传实现

服务提供方（接收文件）

服务提供方的实现比较简单，就按Spring MVC的正常实现方式即可，比如：

 

@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class Application {

    @RestController
    public class UploadController {

        @PostMapping(value = "/uploadFile", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
        public String handleFileUpload(@RequestPart(value = "file") MultipartFile file) {
            return file.getName();
        }

    }

    public static void main(String[] args) {
        new SpringApplicationBuilder(Application.class).web(true).run(args);
    }

}

feign调用接口 注解中加入配置类

@FeignClient(value = "xxx", configuration = FeignMultipartSupportConfig.class)
public interface IUploadService {
    /**
     * 文件上传
     * @param file 文件
     * @return
     */
    @RequestMapping(value = "upload/uppic", method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    ResultModel<String> uppic(@RequestPart(value = "file")MultipartFile file, @RequestParam Map<String,Object> map);

}

 

服务消费方（发送文件）

在服务消费方由于会使用Feign客户端，所以在这里需要在引入feign对表单提交的依赖，具体如下：

 

<dependency>
   <groupId>io.github.openfeign.form</groupId>
   <artifactId>feign-form</artifactId>
   <version>3.0.3</version>
</dependency>
<dependency>
   <groupId>io.github.openfeign.form</groupId>
   <artifactId>feign-form-spring</artifactId>
   <version>3.0.3</version>
</dependency>
<dependency>
   <groupId>commons-fileupload</groupId>
   <artifactId>commons-fileupload</artifactId>
   <version>1.3.3</version>
</dependency>

定义文件上传方的应用主类和FeignClient，假设服务提供方的服务名为eureka-feign-upload-server

 

@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        new SpringApplicationBuilder(Application.class).web(true).run(args);
    }

}

@FeignClient(value = "upload-server", configuration = UploadService.MultipartSupportConfig.class)
public interface UploadService {
 
    @PostMapping(value = "/uploadFile", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    String handleFileUpload(@RequestPart(value = "file") MultipartFile file);
 
    @Configuration
    class MultipartSupportConfig {
        @Bean
        public Encoder feignFormEncoder() {
            return new SpringFormEncoder();
        }
    }
 
}

在启动了服务提供方之后，尝试在服务消费方编写测试用例来通过上面定义的Feign客户端来传文件，比如：

 

@Slf4j
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class UploadTester {

    @Autowired
    private UploadService uploadService;

    @Test
    @SneakyThrows
    public void testHandleFileUpload() {

        File file = new File("upload.txt");
        DiskFileItem fileItem = (DiskFileItem) new DiskFileItemFactory().createItem("file",
                MediaType.TEXT_PLAIN_VALUE, true, file.getName());

        try (InputStream input = new FileInputStream(file); OutputStream os = fileItem.getOutputStream()) {
            IOUtils.copy(input, os);
        } catch (Exception e) {
            throw new IllegalArgumentException("Invalid file: " + e, e);
        }

        MultipartFile multi = new CommonsMultipartFile(fileItem);

        log.info(uploadService.handleFileUpload(multi));
    }

}

@RequestParam与@RequestPart的区别

 

RequestParam：请求参数到处理器功能处理方法的方法参数上的绑定；
@RequestPart：提供对“multipart/form-data”请求的全面支持，支持Servlet 3.0文件上传（javax.servlet.http.Part）、支持内容的HttpMessageConverter（即根据请求头的Content-Type，来判断内容区数据是什么类型，如JSON、XML，能自动转换为命令对象），比@RequestParam更强大（只能对请求参数数据绑定，key-alue格式），而@RequestPart支持如JSON、XML内容区数据的绑定；

完整示例：

读者可以根据喜好选择下面的两个仓库中查看eureka-feign-upload-server和eureka-feign-upload-client两个项目：

• Github：https://github.com/dyc87112/SpringCloud-Learning/
• Gitee：https://gitee.com/didispace/SpringCloud-Learning/