HttpURLConnection 有http连接池码
时间: 2024-02-22 21:38:09 浏览: 16
是的,HttpURLConnection类在JDK 1.5及以后的版本中提供了HTTP连接池的支持。通过使用连接池,在发送HTTP请求时可以重用已经建立的连接,从而减少连接建立的时间和资源消耗。其中,可以通过设置以下系统属性来控制连接池的行为:
- http.maxConnections:最大连接数,默认为5
- http.keepAlive:连接是否保持活动状态,默认为true
- http.maxKeepAliveRequests:同一连接最大请求数,默认为-1(不限制)
- http.keepAliveTimeout:连接保持活动状态的时间,默认为5秒
通过设置这些属性,可以根据具体情况来调整连接池的大小和行为,以达到更好的性能和资源利用率。
相关问题
HttpURLConnection 配置http连接池
在使用 `HttpURLConnection` 发起 HTTP 请求时,可以通过配置连接池来提高性能和效率。连接池可以重用已经建立的连接,避免频繁地创建和销毁连接,从而减少网络资源的占用和浪费。
下面是一个简单的示例,演示如何使用连接池配置 `HttpURLConnection`:
```java
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.concurrent.TimeUnit;
public class HttpConnectionPoolExample {
public static void main(String[] args) throws IOException {
// 创建连接池
ConnectionPool pool = new ConnectionPool(5, 10, TimeUnit.SECONDS);
// 创建 URL 对象
URL url = new URL("https://www.example.com");
// 获取连接
HttpURLConnection connection = pool.get(url);
// 发起请求
connection.setRequestMethod("GET");
connection.connect();
// 处理响应
int responseCode = connection.getResponseCode();
System.out.println("Response code: " + responseCode);
// 释放连接到连接池
pool.put(connection);
}
}
```
在上面的示例中,我们首先创建了一个 `ConnectionPool` 对象,并设置了最大连接数和连接空闲时间。然后,我们通过 `pool.get(url)` 方法获取一个连接对象,并使用它发起 HTTP 请求。最后,我们通过 `pool.put(connection)` 方法将连接释放回连接池。
注意:在实际应用中,我们需要根据具体情况来设置连接池的参数,以保证性能和效率的最大化。此外,还需要注意在使用完连接后及时释放连接,避免连接池资源的浪费。
HttpURLConnection 发送https请求 并且配置连接池
要使用 `HttpURLConnection` 发送 `https` 请求并配置连接池,可以按照以下步骤操作:
1. 获取 `SSLContext` 对象,用于创建 `SSLSocketFactory` 对象,以便在 `HttpsURLConnection` 中使用:
```java
SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, null, null);
SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
```
2. 创建连接池对象 `PoolingHttpClientConnectionManager`,并设置最大连接数和每个路由的最大连接数:
```java
PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager();
connManager.setMaxTotal(200);
connManager.setDefaultMaxPerRoute(20);
```
3. 创建 `HttpClient` 对象,设置连接池和请求参数:
```java
HttpClient httpClient = HttpClients.custom()
.setSSLSocketFactory(sslSocketFactory)
.setConnectionManager(connManager)
.build();
```
4. 创建 `URL` 对象,并打开连接:
```java
URL url = new URL("https://example.com");
HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
```
5. 设置连接的一些属性,如请求方法、超时时间、是否允许重定向等:
```java
connection.setRequestMethod("GET");
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
connection.setInstanceFollowRedirects(false);
```
6. 设置请求头部信息:
```java
connection.setRequestProperty("User-Agent", "Mozilla/5.0");
connection.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
```
7. 发送请求并读取响应:
```java
InputStream inputStream = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
StringBuilder response = new StringBuilder();
while ((line = reader.readLine()) != null) {
response.append(line);
}
reader.close();
```
完整代码示例:
```java
import org.apache.http.client.HttpClient;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
public class HttpsExample {
public static void main(String[] args) throws Exception {
SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, null, null);
SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager();
connManager.setMaxTotal(200);
connManager.setDefaultMaxPerRoute(20);
HttpClient httpClient = HttpClients.custom()
.setSSLSocketFactory(sslSocketFactory)
.setConnectionManager(connManager)
.build();
URL url = new URL("https://example.com");
HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(5000);
connection.setReadTimeout(5000);
connection.setInstanceFollowRedirects(false);
connection.setRequestProperty("User-Agent", "Mozilla/5.0");
connection.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
InputStream inputStream = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
StringBuilder response = new StringBuilder();
while ((line = reader.readLine()) != null) {
response.append(line);
}
reader.close();
System.out.println(response.toString());
}
}
```