postman form-data传参java实现

java实现：

    /**
     * form表单提交
     * @param url
     * @param map
     * @return
     */
    public static String doPostForm(String url, Map map) {
        String strResult = "";
        // 1. 获取默认的client实例
        CloseableHttpClient client = HttpClients.createDefault();
        // 2. 创建httppost实例
        HttpPost httpPost = new HttpPost(url);
        httpPost.setHeader("Content-Type","application/x-www-form-urlencoded;charset=UTF-8");
        // 3. 创建参数队列（键值对列表）
        List paramPairs = new ArrayList<>();
        Set keySet = map.keySet();
        for (String key : keySet) {
            Object val = map.get(key);
            paramPairs.add(new BasicNameValuePair(key, val.toString()));
        }
        UrlEncodedFormEntity entity;
        try {
            // 4. 将参数设置到entity对象中
            entity = new UrlEncodedFormEntity(paramPairs, "UTF-8");
            System.out.println("封装的参数："+entity);
            // 5. 将entity对象设置到httppost对象中
            httpPost.setEntity(entity);
            // 6. 发送请求并回去响应
            CloseableHttpResponse resp = client.execute(httpPost);
            try {
                // 7. 获取响应entity
                HttpEntity respEntity = resp.getEntity();
                strResult = EntityUtils.toString(respEntity, "UTF-8");
            } finally {
                // 9. 关闭响应对象
                resp.close();
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 10. 关闭连接，释放资源
            try {
                client.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return strResult;
    }

第二种方式：

导入依赖：

  
        
            org.apache.httpcomponents
            httpmime
            4.5.8
        
        
            commons-httpclient
            commons-httpclient
            3.1
        

    /**
     * @param params 非文件参数
     * @param url    请求地址
     * @param header 请求头信息（没有传null）
     * @return String
     **/
    public static String sendPostRequest(String url, Map params, Map header) {
        try {
            PostMethod postMethod = new PostMethod(url);
            postMethod.setRequestHeader("Content-Type", AppConsts.CONTENT_TYPE_FORM + ";charset=" + AppConsts.ENCODING_UTF8);
            if (!CollectionUtils.isEmpty(header)){
                header.forEach(postMethod::setRequestHeader);
            }
            NameValuePair[] data = new NameValuePair[params.size()];
            int i = 0;
            for (String key : params.keySet()) {
                data[i] = new NameValuePair(key, params.get(key) == null ? "" : params.get(key).toString());
                i++;
            }

            postMethod.setRequestBody(data);

            HttpClient httpClient = new HttpClient();
            int response = httpClient.executeMethod(postMethod); // 执行POST方法
            String result = postMethod.getResponseBodyAsString();

            return result;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }