用单例模式为应用中所有HTTP请求服务创建一个HttpClient

import org.apache.http.HttpVersion;

import org.apache.http.client.HttpClient;

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.conn.ssl.SSLSocketFactory;

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.HttpConnectionParams;

import org.apache.http.params.HttpParams;

import org.apache.http.params.HttpProtocolParams;

import org.apache.http.protocol.HTTP;

 

public class CustomHttpClient {

private static HttpClient customHttpClient;

 

private CustomHttpClient(){};

 

public static synchronized HttpClient getHttpClient(){

if(customHttpClient == null){

HttpParams params = new BasicHttpParams();

HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);

HttpProtocolParams.setContentCharset(params, HTTP.DEFAULT_CONTENT_CHARSET);

HttpProtocolParams.setUseExpectContinue(params, true);

HttpProtocolParams.setUserAgent(params,  "Mozilla/5.0(Linux;U;Android 2.2.1;en-us;Nexus One Build.FRG83) "

                    + "AppleWebKit/553.1(KHTML,like Gecko) Version/4.0 Mobile Safari/533.1");

/* 从连接池中取连接的超时时间 */

ConnManagerParams.setTimeout(params, 1000);

/* 连接超时 */

HttpConnectionParams.setConnectionTimeout(params, 5000);

/* 请求超时 */

HttpConnectionParams.setSoTimeout(params, 10000);

// 设置我们的HttpClient支持HTTP和HTTPS两种模式

            SchemeRegistry schReg = new SchemeRegistry();

            schReg.register(new Scheme("http", PlainSocketFactory

                    .getSocketFactory(), 80));

            schReg.register(new Scheme("https", SSLSocketFactory

                    .getSocketFactory(), 443));

         // 使用线程安全的连接管理来创建HttpClient

            ClientConnectionManager conMgr = new ThreadSafeClientConnManager(

                    params, schReg);

            customHttpClient = new DefaultHttpClient(conMgr, params);

}

return customHttpClient;

}

public Object clone() throws CloneNotSupportedException{

throw new CloneNotSupportedException();

}

}