1、业务需求

发送请求给第三方服务的接口，且请求报文格式为multipart/form-data的数据。支持复杂类型的参数，包含文件类型

2、 依赖包

<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastJSON</artifactId><version>1.2.58</version></dependency><dependency>            <groupId>org.apache.Httpcomponents</groupId>            <artifactId>httpclient</artifactId>            <version>4.5</version>        </dependency>        <dependency>            <groupId>org.apache.httpcomponents</groupId>            <artifactId>httpmime</artifactId>            <version>4.5</version>        </dependency>

3、 请求方式实现

    public static <T> T doPostFORMData(String url, Map<String, Object> param,Class<T> clazz) {        return doPostFormData(url, param,new TypeReference<T>() {@Overridepublic Type getType() {return clazz;}});    }        public static <T> T doPostFormData(String url, Map<String, Object> param,TypeReference<T> type) {        // 创建Http实例        CloseableHttpClient httpClient = HttpClients.createDefault();        // 创建HttpPost实例        HttpPost httpPost = new HttpPost(url);               // 请求参数配置        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000)                .setConnectionRequestTimeout(10000).build();        httpPost.setConfig(requestConfig);               try {            MultipartEntityBuilder builder = MultipartEntityBuilder.create();            builder.setCharset(java.NIO.charset.Charset.forName("UTF-8"));            builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);            //表单中其他参数           if(param != null) {           for(Map.Entry<String, Object> entry: param.entrySet()) {           Object value = entry.getValue();           System.err.println(entry.geTKEy());                   if(value instanceof File) {                   // 文件流                   builder.addBinaryBody(entry.getKey(), (File)value);                   }else {                   builder.addPart(entry.getKey(),new StringBody(String.valueOf(entry.getValue()), ContentType.create("text/plain", Consts.UTF_8)));                      }      }           }                       HttpEntity entity = builder.build();            httpPost.setEntity(entity);            HttpResponse response = httpClient.execute(httpPost);// 执行提交            if (response.getStatusLine().getStatusCode() == httpstatus.OK.value()) {                // 返回                String res = EntityUtils.toString(response.getEntity(), java.nio.charset.Charset.forName("UTF-8"));                return jsON.parseObject(res).toJavaObject(type);            }                   } catch (Exception e) {            e.printStackTrace();            log.error("调用HttpPost失败！" ,e);        } finally {            if (httpClient != null) {                try {                    httpClient.close();                } catch (IOException e) {                log.error("关闭HttpPost连接失败！",e);                }            }        }               return null;    }

4、 其他

4.1、 MultipartFile对象转换File对象

4.1.1、 依赖包

commons-iocommons-io2.6

4.1.1、 实现

public static File getFile(String path,MultipartFile multipartFile) {try {File file = new File(path); FileUtils.copyInputStreamToFile(multipartFile.getInputStream(), file);return file;} catch (IOException e) {e.printStackTrace();}return null;}

来源地址：https://blog.csdn.net/qq_43432189/article/details/130563323