版本HttpCilent 4.5.3
1.GET请求
CloseableHttpClient httpCilent = HttpClients.createDefault();//Creates CloseableHttpClient instance with default configuration.HttpGet httpGet = new HttpGet("http://www.baidu.com");try { ???httpCilent.execute(httpGet);} catch (IOException e) { ???e.printStackTrace();}finally { ???try { ???????httpCilent.close();//释放资源 ???} catch (IOException e) { ???????e.printStackTrace(); ???}}2.GET请求，设置 超时时间
CloseableHttpClient httpCilent2 = HttpClients.createDefault(); ???????RequestConfig requestConfig = RequestConfig.custom() ???????????????.setConnectTimeout(5000) ??//设置连接超时时间 ???????????????.setConnectionRequestTimeout(5000) // 设置请求超时时间 ???????????????.setSocketTimeout(5000) ???????????????.setRedirectsEnabled(true)//默认允许自动重定向 ???????????????.build(); ???????HttpGet httpGet2 = new HttpGet("http://www.baidu.com"); ???????httpGet2.setConfig(requestConfig); ???????String srtResult = ""; ???????try { ???????????HttpResponse httpResponse = httpCilent2.execute(httpGet2); ???????????if(httpResponse.getStatusLine().getStatusCode() == 200){ ???????????????srtResult = EntityUtils.toString(httpResponse.getEntity());//获得返回的结果 ???????????????System.out.println(srtResult); ???????????}else if(httpResponse.getStatusLine().getStatusCode() == 400){ ???????????????//.......... ???????????}else if(httpResponse.getStatusLine().getStatusCode() == 500){ ???????????????//............. ???????????} ???????} catch (IOException e) { ???????????e.printStackTrace(); ???????}finally { ???????????try { ???????????????httpCilent2.close(); ???????????} catch (IOException e) { ???????????????e.printStackTrace(); ???????????} ???????}3.POST请求，参数
//获取可关闭的 httpCilent ???????CloseableHttpClient httpClient = HttpClients.createDefault(); ???????//配置超时时间 ???????RequestConfig requestConfig = RequestConfig.custom(). ???????????????setConnectTimeout(1000).setConnectionRequestTimeout(1000) ???????????????.setSocketTimeout(1000).setRedirectsEnabled(true).build(); ????????????????HttpPost httpPost = new HttpPost("http://consentprt.dtac.co.th/webaoc/123SubscriberProcess"); ???????//设置超时时间 ???????httpPost.setConfig(requestConfig); ???????//装配post请求参数 ???????List<BasicNameValuePair> list = new ArrayList<BasicNameValuePair>(); ????????list.add(new BasicNameValuePair("age", "20")); ?//请求参数 ???????list.add(new BasicNameValuePair("name", "zhangsan")); //请求参数 ???????try { ???????????UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,"UTF-8"); ????????????//设置post求情参数 ???????????httpPost.setEntity(entity); ???????????HttpResponse httpResponse = httpClient.execute(httpPost); ???????????String strResult = ""; ???????????if(httpResponse != null){ ????????????????System.out.println(httpResponse.getStatusLine().getStatusCode()); ???????????????if (httpResponse.getStatusLine().getStatusCode() == 200) { ???????????????????strResult = EntityUtils.toString(httpResponse.getEntity()); ???????????????} else if (httpResponse.getStatusLine().getStatusCode() == 400) { ???????????????????strResult = "Error Response: " + response.getStatusLine().toString(); ???????????????} else if (httpResponse.getStatusLine().getStatusCode() == 500) { ???????????????????strResult = "Error Response: " + response.getStatusLine().toString(); ???????????????} else { ???????????????????strResult = "Error Response: " + response.getStatusLine().toString(); ???????????????} ????????????}else{ ????????????????????????????} ???????????System.out.println(strResult); ???????} catch (Exception e) { ???????????e.printStackTrace(); ???????}finally { ???????????try { ???????????????if(httpClient != null){ ???????????????????httpClient.close(); //释放资源 ???????????????} ???????????} catch (IOException e) { ???????????????e.printStackTrace(); ???????????} ???????}4.Post 请求，map参数
public static String doPost(String url, Map<String, Object> paramsMap){ ???????CloseableHttpClient httpClient = HttpClients.createDefault(); ???????HttpPost httpPost = new HttpPost(url); ???????RequestConfig requestConfig = RequestConfig.custom(). ???????????????setConnectTimeout(180 * 1000).setConnectionRequestTimeout(180 * 1000) ???????????????.setSocketTimeout(180 * 1000).setRedirectsEnabled(true).build(); ???????httpPost.setConfig(requestConfig); ????????????????List<NameValuePair> nvps = new ArrayList<NameValuePair>(); ???????for (String key : paramsMap.keySet()) { ???????????nvps.add(new BasicNameValuePair(key, String.valueOf(paramsMap.get(key)))); ???????} ???????try { ???????????httpPost.setEntity(new UrlEncodedFormEntity(nvps, "UTF-8")); ???????????logger.info("httpPost ===**********===>>> " + EntityUtils.toString(httpPost.getEntity())); ???????????HttpResponse response = httpClient.execute(httpPost); ???????????String strResult = ""; ???????????if (response.getStatusLine().getStatusCode() == 200) { ????????????????strResult = EntityUtils.toString(response.getEntity()); ????????????????return strResult; ???????????} else { ???????????????return "Error Response: " + response.getStatusLine().toString(); ???????????} ???????} catch (Exception e) { ???????????e.printStackTrace(); ???????????return "post failure :caused by-->" + e.getMessage().toString(); ???????}finally { ???????????if(null != httpClient){ ???????????????try { ???????????????????httpClient.close(); ???????????????} catch (IOException e) { ???????????????????e.printStackTrace(); ???????????????} ???????????} ???????} ???}5.POST 请求，参数是json字符串
public static String doPostForJson(String url, String jsonParams){ ???????????CloseableHttpClient httpClient = HttpClients.createDefault(); ???????????HttpPost httpPost = new HttpPost(url); ???????????RequestConfig requestConfig = RequestConfig.custom(). ???????????????????setConnectTimeout(180 * 1000).setConnectionRequestTimeout(180 * 1000) ???????????????????.setSocketTimeout(180 * 1000).setRedirectsEnabled(true).build(); ????????????????????????httpPost.setConfig(requestConfig); ???????????httpPost.setHeader("Content-Type","application/json"); ?// ???????????try { ???????????????httpPost.setEntity(new StringEntity(jsonParams,ContentType.create("application/json", "utf-8"))); ???????????????System.out.println("request parameters" + EntityUtils.toString(httpPost.getEntity())); ???????????????HttpResponse response = httpClient.execute(httpPost); ???????????????System.out.println(" code:"+response.getStatusLine().getStatusCode()); ???????????????System.out.println("doPostForInfobipUnsub response"+response.getStatusLine().toString()); ???????????????return String.valueOf(response.getStatusLine().getStatusCode()); ???????????} catch (Exception e) { ???????????????e.printStackTrace(); ???????????????return "post failure :caused by-->" + e.getMessage().toString(); ???????????}finally { ???????????????if(null != httpClient){ ???????????????????try { ???????????????????????httpClient.close(); ???????????????????} catch (IOException e) { ???????????????????????e.printStackTrace(); ???????????????????} ???????????????} ???????????}}HttpClient 4.5.3（ get和post请求）
原文地址：https://www.cnblogs.com/heqiyoujing/p/10416008.html