实现以form-data参数发送post请求

在对接一个第三方接口的时候，发现 请求参数Body要以multipart/form-data 方式提交。然后就去收集了一下资料，特此记录一下

/** * 以post方式调用第三方接口,以form-data 形式 发送数据 * * @param url post请求url * @param paramMap 表单里其他参数 * @return */
public static String doPost(String url, Map<String, String> paramMap) {
    
  // 创建Http实例
  CloseableHttpClient httpClient = HttpClients.createDefault();
  // 创建HttpPost实例
  HttpPost httpPost = new HttpPost(url);       
  try {
    
      MultipartEntityBuilder builder = MultipartEntityBuilder.create();
      builder.setCharset(java.nio.charset.Charset.forName("UTF-8"));
      builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
      
      //表单中参数
     for(Map.Entry<String, String> entry: paramMap.entrySet()) {
    
          builder.addPart(entry.getKey(),new StringBody(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.SC_OK) {
    
          // 返回
          String res = EntityUtils.toString(response.getEntity(), java.nio.charset.Charset.forName("UTF-8"));
          return res;
      }
     
  } catch (Exception e) {
    
      e.printStackTrace();
      logger.error("调用HttpPost失败！" + e.toString());
  } finally {
    
      if (httpClient != null) {
    
          try {
    
              httpClient.close();
          } catch (IOException e) {
    
              logger.error("关闭HttpPost连接失败！");
          }
      }
  }       
  return null;              
}

---

然后放一下我使用的依赖

<!-- httpclient 相关依赖-->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpcore</artifactId>
    <version>4.4.10</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.6</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpmime</artifactId>
    <version>4.5</version>
</dependency>

然后如果使用PostMan以这种方式测试的话，是这样的。

参考：https://blog.csdn.net/LYY1448019681/article/details/115124407