src/main/java/com/zx/maintain/util/HttpClientUtil.java

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package com.zx.maintain.util;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.params.ClientPNames;
import org.apache.http.client.params.CookiePolicy;
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.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.BasicClientConnectionManager;
import org.apache.http.impl.conn.PoolingClientConnectionManager;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
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.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;



/**
 * HttpClient调用工具类
 * 
 * @author wangxj
 */
public class HttpClientUtil {
	private static final Logger logger = LoggerFactory.getLogger(HttpClientUtil.class);
	private static final String CHARSET_UTF8 = Consts.UTF_8.displayName();
	private static HttpClient _client;

	public static synchronized HttpClient getHttpClient() {
		if (null == _client) {
			HttpParams params = new BasicHttpParams();
			// 设置一些基本参数
			HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
			HttpProtocolParams.setContentCharset(params, CHARSET_UTF8);
			HttpProtocolParams.setUseExpectContinue(params, true);
			HttpProtocolParams.setUserAgent(params, "Mozilla/5.0 (Windows NT 6.2; WOW64) "
					+ "AppleWebKit/537.36 (KHTML, like Gecko) " + "Chrome/27.0.1453.94 Safari/537.36");
			/* 连接超时 */