httpClient和RestTemplate的使用

1、httpClient的使用

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.3.5</version>
</dependency>

 

// 第一步：創建一個httpClient對象
CloseableHttpClient httpClient = HttpClients.createDefault();

// 第二步：創建一個HttpPost對象。需要指定一個url
// HttpPost post = new HttpPost("http://47.244.48.xxx/xxx/xxx/");
HttpPost post = new HttpPost("http://127.0.0.1:8080/xxx/xxx/");

// 攜帶cookie
String sessionId = "PHPSESSID=KSoxfJlB20JJ0...";
BasicHeader header = new BasicHeader("Cookie", sessionId);
post.setHeader(header);

// 第三步：創建一個list模擬表單，list中每個元素是一個NameValuePair對象
List<NameValuePair> formList = new ArrayList<>();
formList.add(new BasicNameValuePair("xxx", "xxx"));
formList.add(new BasicNameValuePair("xxx", "xxx"));

// 第四步：需要把表單數據包裝到Entity對象中: StringEntity
StringEntity entity = new UrlEncodedFormEntity(formList, "utf-8");
post.setEntity(entity);

// 第五步：執行請求。
CloseableHttpResponse response = httpClient.execute(post);

// 第六步：接收返回結果
HttpEntity httpEntity = response.getEntity();
String result = EntityUtils.toString(httpEntity);
System.out.println(result);

// 第七步：關閉流。
response.close();
httpClient.close();

 

2、RestTemplate的使用：get請求帶Cookie

String url = Config.XXX_BASE_URL + "/userlevel?inviterId=" + invit1;
String restInfo = MessageFormat.format("url:{0}, inviterId:{1}", url, invit1);
UtilFunctions.log.info("UserController#register call rest api info, " + restInfo);

HttpHeaders requestHeaders = new HttpHeaders();
List<String> cookieList = UtilFunctions.getCookieList(request);
requestHeaders.put("Cookie", cookieList);
HttpEntity<String> requestEntity = new HttpEntity<String>(null, requestHeaders);
restTemplate.exchange(url, HttpMethod.GET, requestEntity, JSONObject.class).getBody();

 　　

　　UtilFunctions類的getCookieList()方法

public static List<String> getCookieList(HttpServletRequest request) {
    List<String> cookieList = new ArrayList<>();
    
    Cookie[] cookies = request.getCookies();
    if (cookies == null || cookies.length == 0) {
        return cookieList;
    }

    for (Cookie cookie : cookies) {
        cookieList.add(cookie.getName() + "=" + cookie.getValue());
    }
    
    return cookieList;
}

 

 

參考資料：

　　1）Springboot — 用更優雅的方式發HTTP請求(RestTemplate詳解)