代码语言：javascript复制
public class HttpClientUtils {
private final static Logger logger = LoggerFactory.getLogger(HttpClientUtils.class);
private static CloseableHttpClient httpClient;
private static PoolingHttpClientConnectionManager manager; // 连接池管理类
private static ScheduledExecutorService monitorExecutor; // 监控
private final static Object syncLock = new Object(); // 相当于线程锁,用于线程安全
private static final int CONNECT_TIMEOUT = HttpClientConfig.httpConnectTimeout;// 设置连接建立的超时时间为10s
private static final int SOCKET_TIMEOUT = HttpClientConfig.httpSocketTimeout;
private static final int MAX_CONN = HttpClientConfig.httpMaxPoolSize; // 最大连接数
private static final int Max_PRE_ROUTE = HttpClientConfig.httpMaxPoolSize;
private static final int MAX_ROUTE = HttpClientConfig.httpMaxPoolSize;
/**
* 对http请求进行基本设置
*
* @param httpRequestBase http请求
*/
public static void setRequestConfig(HttpRequestBase httpRequestBase) {
RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(CONNECT_TIMEOUT)
.setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
httpRequestBase.setConfig(requestConfig);
}
public static CloseableHttpClient getHttpClient(String url) {
String hostName = url.split("/")[2];
int port = 80;
if (hostName.contains(":")) {
String[] args = hostName.split(":");
hostName = args[0];
port = Integer.parseInt(args[1]);
}
if (httpClient == null) {
// 多线程下多个线程同时调用getHttpClient容易导致重复创建httpClient对象的问题
synchronized (syncLock) {
if (httpClient == null) {
httpClient = createHttpClient(hostName, port);
// 开启监控线程,对异常和空闲线程进行关闭
monitorExecutor = Executors.newScheduledThreadPool(1);
monitorExecutor.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
// 关闭异常连接
manager.closeExpiredConnections();
// 关闭5s空闲的连接
manager.closeIdleConnections(HttpClientConfig.httpIdelTimeout, TimeUnit.MILLISECONDS);
// logger.info("close expired and idle for over 5s connection");
}
}, HttpClientConfig.httpMonitorInterval, HttpClientConfig.httpMonitorInterval,
TimeUnit.MILLISECONDS);
}
}
}
return httpClient;
}
/**
* 根据host和port构建httpclient实例
*
* @param host 要访问的域名
* @param port 要访问的端口
* @return
*/
public static CloseableHttpClient createHttpClient(String host, int port) {
ConnectionSocketFactory plainSocketFactory = PlainConnectionSocketFactory.getSocketFactory();
LayeredConnectionSocketFactory sslSocketFactory = SSLConnectionSocketFactory.getSocketFactory();
Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create()
.register("http", plainSocketFactory).register("https", sslSocketFactory).build();
manager = new PoolingHttpClientConnectionManager(registry);
// 设置连接参数
manager.setMaxTotal(MAX_CONN); // 最大连接数
manager.setDefaultMaxPerRoute(Max_PRE_ROUTE); // 路由最大连接数
HttpHost httpHost = new HttpHost(host, port);
manager.setMaxPerRoute(new HttpRoute(httpHost), MAX_ROUTE);
// 请求失败时,进行请求重试
HttpRequestRetryHandler handler = new HttpRequestRetryHandler() {
@Override
public boolean retryRequest(IOException e, int i, HttpContext httpContext) {
if (i > 3) {
// 重试超过3次,放弃请求
logger.error("retry has more than 3 time, give up request");
return false;
}
if (e instanceof NoHttpResponseException) {
// 服务器没有响应,可能是服务器断开了连接,应该重试
logger.error("receive no response from server, retry");
return true;
}
if (e instanceof SSLHandshakeException) {
// SSL握手异常
logger.error("SSL hand shake exception");
return false;
}
if (e instanceof InterruptedIOException) {
// 超时
logger.error("InterruptedIOException");
return false;
}
if (e instanceof UnknownHostException) {
// 服务器不可达
logger.error("server host unknown");
return false;
}
if (e instanceof ConnectTimeoutException) {
// 连接超时
logger.error("Connection Time out");
return false;
}
if (e instanceof SSLException) {
logger.error("SSLException");
return false;
}
HttpClientContext context = HttpClientContext.adapt(httpContext);
HttpRequest request = context.getRequest();
if (!(request instanceof HttpEntityEnclosingRequest)) {
// 如果请求不是关闭连接的请求
return true;
}
return false;
}
};
CloseableHttpClient client = HttpClients.custom().setConnectionManager(manager).setRetryHandler(handler)
.build();
return client;
}
/**
* 关闭连接池
*/
public static void closeConnectionPool() {
try {
httpClient.close();
manager.close();
monitorExecutor.shutdown();
} catch (IOException e) {
e.printStackTrace();
}
}
}
