Apache HttpClient 连接池的使用
import java.io.IOException;
import java.util.Random;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.HttpVersion;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.params.CoreProtocolPNames;
import org.apache.http.params.HttpParams;
public class HttpClientUtils {
private static final Log log = LogFactory.getLog(HttpClientUtils.class);
private static ThreadSafeClientConnManager cm = null;
static {
SchemeRegistry schemeRegistry = new SchemeRegistry();
schemeRegistry.register(new Scheme("http", 80, PlainSocketFactory
.getSocketFactory()));
cm = new ThreadSafeClientConnManager(schemeRegistry);
try {
int maxTotal = 100;
cm.setMaxTotal(maxTotal);
} catch (NumberFormatException e) {
log.error(
"Key[httpclient.max_total] Not Found in systemConfig.properties",
e);
}
// 每条通道的并发连接数设置(连接池)
try {
int defaultMaxConnection = 50;
cm.setDefaultMaxPerRoute(defaultMaxConnection);
} catch (NumberFormatException e) {
log.error(
"Key[httpclient.default_max_connection] Not Found in systemConfig.properties",
e);
}
}
public static HttpClient getHttpClient() {
HttpParams params = new BasicHttpParams();
params.setParameter(CoreProtocolPNames.PROTOCOL_VERSION,
HttpVersion.HTTP_1_1);
params.setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 3000); // 3000ms
return new DefaultHttpClient(cm, params);
}
public static void release() {
if (cm != null) {
cm.shutdown();
}
}
public static void main(String[] args) throws ClientProtocolException,
IOException {
Random r = new Random();
for (int i = 0; i < 10; i++) {
long l1 = System.currentTimeMillis();
HttpClient client = getHttpClient();
HttpGet get = new HttpGet("http://www.baidu.com/s?wd="
+ r.nextInt(5000));
HttpResponse response = client.execute(get);
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
HttpEntity entity = response.getEntity();
long l = entity.getContentLength();
System.out.println("回应结果长度:" + l);
}
System.out.println("查询耗时" + (System.currentTimeMillis() - l1));
}
}
}
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