CloseableHttpClient 和 MultipartFile 配合上传文件

时间：2025-03-16 07:19:32

1 后台

（1）java

@RequestMapping(value = "/showapi", method = RequestMethod.POST)
public ResponseEntity showapi(@RequestParam("file") MultipartFile multipartFile) {
        byte[] byteImg = ();
}
 

普通的接口，只不过接收参数类型为MultipartFile
 

 

（2）spring配置
 

 

<bean id="multipartResolver" class="">
    <property name="maxUploadSize" value="100000" />
    <property name="maxInMemorySize" value="100000" />
</bean>
 

dispatcherServlet是没有处理multipart/form-data,需要单独配置一个resolver，id="multipartResolver"默认如此设置
 



 （3）maven依赖 

 

 

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.2.1</version> <!-- makesure correct version here -->
</dependency>
 



 

2 客户端
 



 

public static String decaptcha(File file) {
    CloseableHttpClient client = HttpClients.createDefault();
    HttpPost post = new HttpPost(ReadProperties.read(""));
    RequestConfig config = RequestConfig.custom().setSocketTimeout(30000).setConnectTimeout(20000).build();
    (config);
    
 

    FileBody fileBody = new FileBody(file, ContentType.DEFAULT_BINARY);
    MultipartEntityBuilder builder = MultipartEntityBuilder.create();
    (HttpMultipartMode.BROWSER_COMPATIBLE);
    ("file", fileBody);
 

    // 相当于 <input type="file" class="file" name="file">,匹配@RequestParam("file")
    // .addPart()可以设置模拟浏览器<input/>的表单提交
 

    HttpEntity entity = ();
    (entity);
    String result = "";

    try {
        CloseableHttpResponse e = (post);
        HttpEntity resEntity = ();
        if(entity != null) {
            result = EntityUtils.toString(resEntity);
            System.out.println("response content:" + result);
        }
    } catch (IOException var10) {
        logger.error("请求解析验证码io异常",var10);
        ();
    }

    return result;
}
 


 

附录（浏览器请求数据格式）：
 

------WebKitFormBoundaryqgkaBn8IHJCuNmiW
 

Content-Disposition: form-data; name="firstName"Charles
 

------WebKitFormBoundaryqgkaBn8IHJCuNmiW
 

Content-Disposition: form-data; name="lastName"Xavier
 

------WebKitFormBoundaryqgkaBn8IHJCuNmiW
 

Content-Disposition: form-data; name="email"charles@
 

------WebKitFormBoundaryqgkaBn8IHJCuNmiW
 

Content-Disposition: form-data; name="username"professorx
 

------WebKitFormBoundaryqgkaBn8IHJCuNmiW
 

Content-Disposition: form-data; name="password"letmein01
 

------WebKitFormBoundaryqgkaBn8IHJCuNmiW
 

Content-Disposition: form-data; name="profilePicture"; filename=""Content-Type: image/jpeg
 

[[ Binary image data goes here ]]
 

------WebKitFormBoundaryqgkaBn8IHJCuNmiW--
 


 

这些name就是映射到@RequestParam(name)
 

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