最近工作中接觸到httpClient類，於是簡單總結了下，發現形式並不複雜：

這裡對於get請求形式，比較簡單，只需要把引數加到地址上，一起執行即可

CloseableHttpAsyncClient httpclient = HttpAsyncClients.createDefault();
		try {
			httpclient.start();
			HttpGet request = new HttpGet(url + "?" + param);
			Future<HttpResponse> future = httpclient.execute(request, null);
			HttpResponse response = future.get();
 

對於post傳送引數的形式就比較多樣了，但是儲存的位置都是在請求的body中：

通過HttpPost可以設定各種傳輸的格式，有好多好多種，但是總結起來最常用的包含以下三種：

可以通過HttpPost物件的setHeader屬性來設定：

形式如：

HttpPost.addHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");

其中Content-Type代表傳送的資料的格式，後面的引數可以根據需要設定，最常用到的如下：

application/json ： JSON資料格式

application/xml ： XML資料格式（被JSON替代了）

application/x-www-form-urlencoded :<form encType=””>中預設的encType，form表單資料被編碼為key/value格式傳送到伺服器（表單預設的提交資料的格式）

1：以form形式傳送引數

HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
		CloseableHttpClient closeableHttpClient = httpClientBuilder.build();
		HttpPost httpPost = new HttpPost(url);
		httpPost.setConfig(requestLogConfig);
		if (parasMap != null && parasMap.size() > 0) {
			List<NameValuePair> parasList = new ArrayList<NameValuePair>();
			Iterator<String> keys = parasMap.keySet().iterator();
			while (keys.hasNext()) {
				String key = keys.next();
				parasList.add(new BasicNameValuePair(key, parasMap.get(key)));
			}
			httpPost.setEntity(new UrlEncodedFormEntity(parasList, "UTF-8"));
 

而下面的JSON則直接可以通過setEntity賦值即可

2：以json形式傳送引數

		     HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
		CloseableHttpClient closeableHttpClient = httpClientBuilder.build();
		HttpPost httpPost = new HttpPost(url);
		httpPost.addHeader("Content-Type", "application/json;charset=UTF-8");
		String jsonStr = JSON.toJSONString(parasMap);
		if (parasMap != null && parasMap.size() > 0) {
			StringEntity strEntity = new StringEntity(URLEncoder.encode(
					jsonStr, "UTF-8"));
			// StringEntity strEntity = new StringEntity(jsonStr);
			httpPost.setEntity(strEntity);
		}
		try {
			CloseableHttpResponse response = closeableHttpClient
					.execute(httpPost);
			HttpEntity entity = response.getEntity();