HttpClient相比传统JDK自带的URLConnection，增加了易用性和灵活性，它不仅是客户端发送Http请求变得容易，而且也方便了开发人员测试接口（基于Http协议的），即提高了开发的效率，也方便提高代码的健壮性。示例：发送Post/Get请求接口。
依赖包
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.3.6</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient-cache</artifactId>
<version>4.3.6</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpmime</artifactId>
<version>4.3.6</version>
</dependency>
代码示例：
HttpClient连接池
/**
* http连接池
* Created by liujia68 on 2018/11/15
*/
public class HttpClientUtils {
private static PoolingHttpClientConnectionManager connectionManager;//连接池管理类
private static HttpClientBuilder httpBuilder;
static RequestConfig requestConfig;
private static int MAXCONNECTION = 10;
private static int DEFAULTMAXCONNECTION = 5;
//static String IP = "cnivi.com.cn";
//private static int PORT = 80;
static String IP = "172.28.91.145";
private static int PORT = 8080;
static {
//设置http的状态参数
requestConfig = RequestConfig.custom()
.setConnectTimeout(5000)//一、连接超时：connectionTimeout-->指的是连接一个url的连接等待时间
.setSocketTimeout(5000)// 二、读取数据超时：SocketTimeout-->指的是连接上一个url，获取response的返回等待时间
.setConnectionRequestTimeout(5000)//三、从连接池获取连接的超时，如果连接池里连接都被用了，且超过这个时间，会抛出超时异常
.build();
HttpHost target = new HttpHost(IP, PORT);
connectionManager = new PoolingHttpClientConnectionManager();
connectionManager.setMaxTotal(MAXCONNECTION);//客户端总并行链接最大数
connectionManager.setDefaultMaxPerRoute(DEFAULTMAXCONNECTION);//每个主机的最大并行链接数
connectionManager.setMaxPerRoute(new HttpRoute(target), 20);///设置到每个路由的最大连接数
httpBuilder = HttpClients.custom();
httpBuilder.setConnectionManager(connectionManager);
}
static CloseableHttpClient getConnection() {
CloseableHttpClient httpClient = httpBuilder.build();
return httpClient;
}
static void dealResult(CloseableHttpResponse response) {
if (response.getStatusLine().getStatusCode() == 200) {
HttpEntity entity = response.getEntity();
String message = null;
try {
message = EntityUtils.toString(entity, "utf-8");
} catch (IOException e) {
e.printStackTrace();
}
System.out.println(message);
} else {
System.out.println("请求失败");
}
}
}
测试类
public class test {
private static void testPost() throws Exception{
CloseableHttpClient client = getConnection();
//URL+入参requestParam
URIBuilder uriBuilder = new URIBuilder("http://www.sogou.com/web");
uriBuilder.addParameter("query","花千骨");
//requestBody
List<NameValuePair> formparams = new ArrayList<NameValuePair>();
formparams.add(new BasicNameValuePair("account", ""));
formparams.add(new BasicNameValuePair("password", ""));
HttpEntity reqEntity = new UrlEncodedFormEntity(formparams, "utf-8");
HttpPost post = new HttpPost(uriBuilder.build());//URL+入参requestParam
post.setEntity(reqEntity); //requestBody
post.setConfig(requestConfig);
CloseableHttpResponse response = client.execute(post);
dealResult(response);
response.close();
client.close();
}
private static void testGet(){
try (CloseableHttpClient httpClient = getConnection()){
//URL+入参requestParam
URIBuilder uriBuilder = new URIBuilder("http://172.28.91.145:8080/bp-query-service");
uriBuilder.addParameter("sid","gx");
uriBuilder.addParameter("curTime","20181115");
uriBuilder.addParameter("queryType","TUV");
uriBuilder.addParameter("dataRule","byTotal");
uriBuilder.addParameter("appid","1");
uriBuilder.addParameter("clientid","1");
uriBuilder.addParameter("conditionTabs","");
HttpGet httpget = new HttpGet(uriBuilder.build());//URL+入参requestParam
httpget.setConfig(requestConfig);
CloseableHttpResponse response = httpClient.execute(httpget);
dealResult(response);
response.close();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (URISyntaxException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}