httpclient访问restful

最新推荐文章于 2025-05-07 20:30:00 发布

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本文介绍如何使用Apache HttpClient实现JAX-RS RESTful客户端，并通过示例代码展示了如何发送POST请求到RESTful API。具体步骤包括创建HttpClient实例、构造请求体、设置请求头以及发送请求并处理响应。

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转：http://howtodoinjava.com/2013/05/21/jax-rs-restful-client-using-apache-httpclient/ 
JAX-RS RESTful client using apache httpclient 
 
  public 
  static 
  void 
  demoPostRESTAPI() 
  throws 
  Exception 
 
  {
 
  DefaultHttpClient httpClient = 
  new 
  DefaultHttpClient(); 
 
  User user = 
  new 
  User(); 
 
  user.setId(
  100
  ); 
 
  user.setFirstName(
  "Lokesh"
  ); 
 
  user.setLastName(
  "Gupta"
  ); 
 
  StringWriter writer = 
  new 
  StringWriter(); 
 
  JAXBContext jaxbContext = JAXBContext.newInstance(User.
  class
  ); 
 
  Marshaller jaxbMarshaller = jaxbContext.createMarshaller(); 
 
  jaxbMarshaller.marshal(user, writer); 
 
  try 
 
  { 
 
  //Define a postRequest request 
 
  HttpPost postRequest = 
  new 
  HttpPost(
  "http://localhost:8080/RESTfulDemoApplication/user-management/users"
  ); 
 
  //Set the API media type in http content-type header 
 
  postRequest.addHeader(
  "content-type"
  , 
  "application/xml"
  ); 
 
  //Set the request post body 
 
  StringEntity userEntity = 
  new 
  StringEntity(writer.getBuffer().toString()); 
 
  postRequest.setEntity(userEntity); 
 
  //Send the request; It will immediately return the response in HttpResponse object if any 
 
  HttpResponse response = httpClient.execute(postRequest); 
 
  //verify the valid error code first 
 
  int 
  statusCode = response.getStatusLine().getStatusCode(); 
 
  if 
  (statusCode != 
  201
  ) 
 
  { 
 
  throw 
  new 
  RuntimeException(
  "Failed with HTTP error code : " 
  + statusCode); 
 
  } 
 
  } 
 
  finally 
 
  { 
 
  //Important: Close the connect 
 
  httpClient.getConnectionManager().shutdown(); 
 
  } 
 
  }
 
  就是关键的
  postRequest.addHeader(
  "content-type"
  , 
  "application/xml"
  );