HttpClient 发送Http Get/Post请求

Socket的特点：属于传输层，是对Tcp/IP协议的实现
   1.开启端口，该通信为长连接通信，很容易被防火墙回收，可以通过心跳机制来实现，但是开发难度会比较大。
   2.传输的数据是字符串，可读性不强
   3.socket端口不便于推广
   http://45.113.192.102:2345 www.baidu.com
   4.性能相较于其他通信协议是最优秀的
Http协议访问：属于应用层的协议，对socket进行了封装
1.跨平台
2.传数据不够友好
http://localhost:8080?username=jack&age=18

/**
* rest 缓存考虑若要利用无状态操作的特性,
*
* 有限的带宽和资源情况下使用
*
* 返回的结构可以采用（由开发者定义的）任何格式
*
* @author xxx
*
*/
public class HttpClient {

private static final Logger LOG = LoggerFactory.getLogger(HttpClient.class);

public static String get(List<String> params) {

String url = "http://localhost:8080/Base/testGet?username=" + params.get(0);

       // 创建httpClient对象
       CloseableHttpClient httpClient = HttpClientBuilder.create().build();
       // 创建httpGet对象
       HttpGet httpGet = new HttpGet(url);

       // 响应对象
       CloseableHttpResponse response = null;
       try {
           // 执行请求
           response = httpClient.execute(httpGet);
           // 获取响应实体
           HttpEntity httpEntity = response.getEntity();
           // 获取响应内容
           if (httpEntity != null) {
               return EntityUtils.toString(httpEntity);
           }
       } catch (ClientProtocolException e) {
           LOG.error("ClientProtocolException", e);
       } catch (IOException e) {
           LOG.error("IOException", e);
       } finally {

           try {
               // 释放资源
               if (response != null) {
                   response.close();
               }
               if (httpClient != null) {
                   httpClient.close();
               }
           } catch (IOException e) {
               LOG.error("IOException", e);
           }
       }

return null;

}

public static String post(List<String> params) {

String url = "http://localhost:8080/Base/testPost";

       // 创建httpClient对象
       CloseableHttpClient httpClient = HttpClientBuilder.create().build();
       // 创建httpGet对象
       HttpPost httpPost = new HttpPost(url);

// 设置post请求参数
List<NameValuePair> list = new ArrayList<NameValuePair>();

list.add(new BasicNameValuePair("username", params.get(0)));
list.add(new BasicNameValuePair("password", params.get(1)));

       try {
           UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list);
           httpPost.setEntity(entity);
       } catch (UnsupportedEncodingException e) {
           LOG.error("UnsupportedEncodingException", e);
       }

       // 响应对象
       CloseableHttpResponse response = null;
       try {
           // 执行请求
           response = httpClient.execute(httpPost);
           // 获取响应实体
           HttpEntity httpEntity = response.getEntity();
           // 获取响应内容
           if (httpEntity != null) {
               return EntityUtils.toString(httpEntity);
           }

       } catch (ClientProtocolException e) {
           LOG.error("ClientProtocolException", e);
       } catch (IOException e) {
           LOG.error("IOException", e);
       } finally {
           try {
               // 释放资源
               if (response != null) {
                   response.close();
               }
               if (httpClient != null) {
                   httpClient.close();
               }
           } catch (IOException e) {
               LOG.error("IOException", e);
           }
       }

return null;
}

}

HttpClient 发送Http Get/Post请求

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