我的需求是。现在我访问HTTPS的一个REST服务。但是每次请求都会要花费很多的时间建立连接。所以想问一下如何使用apache的httpclient来创建一个线程池的HTTPS连接。使用的时候拿出来用就行了。
HTTPCLIENT 4.0或者3.0的解决方案都可以。
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不是线程池的。。是 类似连接池的概念。
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httpclient本身不是thread safe的，所以多线程的时候，上面的方法是正确的。。
这个例子本身就帮你管理了链接，线程池，
look at this...
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import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.params.ConnManagerParams;
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.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.util.EntityUtils;
/**
An example that performs GETs from multiple threads.
*/
public class ClientMultiThreadedExecution {
public static void main(String[] args) throws Exception {
// Create and initialize HTTP parameters
HttpParams params = new BasicHttpParams();
ConnManagerParams.setMaxTotalConnections(params, 100);
HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
// Create and initialize scheme registry
SchemeRegistry schemeRegistry = new SchemeRegistry();
schemeRegistry.register(
new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
// Create an HttpClient with the ThreadSafeClientConnManager.
// This connection manager must be used if more than one thread will
// be using the HttpClient.
ClientConnectionManager cm = new ThreadSafeClientConnManager(params, schemeRegistry);
HttpClient httpClient = new DefaultHttpClient(cm, params);
// create an array of URIs to perform GETs on
String[] urisToGet = {
"http://hc.apache.org/",
"http://hc.apache.org/httpcomponents-core/",
"http://hc.apache.org/httpcomponents-client/",
"http://svn.apache.org/viewvc/httpcomponents/"
};
// create a thread for each URI
GetThread[] threads = new GetThread[urisToGet.length];
for (int i = 0; i < threads.length; i++) {
HttpGet httpget = new HttpGet(urisToGet[i]);
threads[i] = new GetThread(httpClient, httpget, i + 1);
}
// start the threads
for (int j = 0; j < threads.length; j++) {
threads[j].start();
}
// join the threads
for (int j = 0; j < threads.length; j++) {
threads[j].join();
}
// When HttpClient instance is no longer needed,
// shut down the connection manager to ensure
// immediate deallocation of all system resources
httpClient.getConnectionManager().shutdown();
}
/**
A thread that performs a GET.
*/
static class GetThread extends Thread {
private final HttpClient httpClient;
private final HttpContext context;
private final HttpGet httpget;
private final int id;
public GetThread(HttpClient httpClient, HttpGet httpget, int id) {
this.httpClient = httpClient;
this.context = new BasicHttpContext();
this.httpget = httpget;
this.id = id;
}
/**
Executes the GetMethod and prints some status information.
*/
@Override
public void run() {
System.out.println(id + " - about to get something from " + httpget.getURI());
try {
// execute the method
HttpResponse response = httpClient.execute(httpget, context);
System.out.println(id + " - get executed");
// get the response body as an array of bytes
HttpEntity entity = response.getEntity();
if (entity != null) {
byte[] bytes = EntityUtils.toByteArray(entity);
System.out.println(id + " - " + bytes.length + " bytes read");
}
} catch (Exception e) {
httpget.abort();
System.out.println(id + " - error: " + e);
}
}
}
}
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