支持post,get请求（http,https）的HttpClientUtils

支持post,get请求（http,https）的HttpClientUtils
调用不同的接口，受不同协议，以及不同请求方式影响，总结的一个简洁的HttpClientUtils工具类。
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package com.lilin.utils;import java.io.IOException;import java.net.SocketTimeoutException;import java.security.GeneralSecurityException;import java.security.cert.CertificateException;import java.security.cert.X509Certificate;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Map.Entry;import java.util.Set;import javax.net.ssl.SSLContext;import javax.net.ssl.SSLException;import javax.net.ssl.SSLSession;import javax.net.ssl.SSLSocket;import org.apache.commons.io.IOUtils;import org.apache.commons.lang.StringUtils;import org.apache.http.Consts;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.HttpClient;import org.apache.http.client.config.RequestConfig;import org.apache.http.client.config.RequestConfig.Builder;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.conn.ConnectTimeoutException;import org.apache.http.conn.ssl.SSLConnectionSocketFactory;import org.apache.http.conn.ssl.SSLContextBuilder;import org.apache.http.conn.ssl.TrustStrategy;import org.apache.http.conn.ssl.X509HostnameVerifier;import org.apache.http.entity.ContentType;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;import org.apache.http.message.BasicNameValuePair;/** *  * @author lilin * */public class HttpClientUtils {    public static final int connTimeout = 10000;    public static final int readTimeout = 10000;    public static final String charset = "UTF-8";    private static HttpClient client = null;    static {        // 创建连接池        // 降低延迟：如果不采用连接池，每次连接发起Http请求的时候都会重新建立TCP连接(经历3次握手)，用完就会关闭连接(4次挥手)，如果采用连接池则减少了这部分时间损耗，别小看这几次握手，本人经过测试发现，基本上3倍的时间延迟        // 支持更大的并发：如果不采用连接池，每次连接都会打开一个端口，在大并发的情况下系统的端口资源很快就会被用完，导致无法建立新的连接        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();        // 设置整个连接池最大连接数 根据自己的场景决定        cm.setMaxTotal(127);        // 设置每个路由上的默认连接个数        cm.setDefaultMaxPerRoute(127);        client = HttpClients.custom().setConnectionManager(cm).build();    }    /**     * 创建 SSL连接     *      * @return     * @throws GeneralSecurityException     */    private static CloseableHttpClient createSSLInsecureClient() throws GeneralSecurityException {        try {            SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {                public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {                    return true;                }            }).build();            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, new X509HostnameVerifier() {                @Override                public boolean verify(String arg0, SSLSession arg1) {                    return true;                }                @Override                public void verify(String host, SSLSocket ssl) throws IOException {                }                @Override                public void verify(String host, X509Certificate cert) throws SSLException {                }                @Override                public void verify(String host, String[] cns, String[] subjectAlts) throws SSLException {                }            });            return HttpClients.custom().setSSLSocketFactory(sslsf).build();        } catch (GeneralSecurityException e) {            throw e;        }    }    public static String get(String url) throws Exception {        return get(url, charset, null, null);    }    public static String get(String url, String charset) throws Exception {        return get(url, charset, connTimeout, readTimeout);    }    public static String postParameters(String url, String parameterStr)            throws ConnectTimeoutException, SocketTimeoutException, Exception {        return post(url, parameterStr, "application/x-www-form-urlencoded", charset, connTimeout, readTimeout);    }    public static String postParameters(String url, String parameterStr, String charset, Integer connTimeout,            Integer readTimeout) throws ConnectTimeoutException, SocketTimeoutException, Exception {        return post(url, parameterStr, "application/x-www-form-urlencoded", charset, connTimeout, readTimeout);    }    /**     * 发送一个 GET 请求     *      * @param url     * @param charset     * @param connTimeout     *            建立链接超时时间,毫秒.     * @param readTimeout     *            响应超时时间,毫秒.     * @return     * @throws ConnectTimeoutException     *             建立链接超时     * @throws SocketTimeoutException     *             响应超时     * @throws Exception     */    public static String get(String url, String charset, Integer connTimeout, Integer readTimeout)            throws ConnectTimeoutException, SocketTimeoutException, Exception {        HttpClient client = null;        HttpGet get = new HttpGet(url);        String result = "";        try {            // 设置参数            Builder customReqConf = RequestConfig.custom();            if (connTimeout != null) {                customReqConf.setConnectTimeout(connTimeout);            }            if (readTimeout != null) {                customReqConf.setSocketTimeout(readTimeout);            }            get.setConfig(customReqConf.build());            HttpResponse res = null;            if (url.startsWith("https")) {                // 执行 Https 请求.                client = createSSLInsecureClient();                res = client.execute(get);            } else {                // 执行 Http 请求.                client = HttpClientUtils.client;                res = client.execute(get);            }            result = IOUtils.toString(res.getEntity().getContent(), charset);        } finally {            get.releaseConnection();            if (url.startsWith("https") && client != null && client instanceof CloseableHttpClient) {                ((CloseableHttpClient) client).close();            }        }        return result;    }    /**     * 发送一个 Post 请求, 使用指定的字符集编码.     *      * @param url     * @param body     *            RequestBody     * @param mimeType     *            例如 application/xml "application/x-www-form-urlencoded"     *            a=1&b=2&c=3     * @param charset     *            编码     * @param connTimeout     *            建立链接超时时间,毫秒.     * @param readTimeout     *            响应超时时间,毫秒.     * @return ResponseBody, 使用指定的字符集编码.     * @throws ConnectTimeoutException     *             建立链接超时异常     * @throws SocketTimeoutException     *             响应超时     * @throws Exception     */    public static String post(String url, String body, String mimeType, String charset, Integer connTimeout,            Integer readTimeout) throws ConnectTimeoutException, SocketTimeoutException, Exception {        HttpClient client = null;        HttpPost post = new HttpPost(url);        String result = "";        try {            if (StringUtils.isNotBlank(body)) {                HttpEntity entity = new StringEntity(body, ContentType.create(mimeType, charset));                post.setEntity(entity);            }            // 设置参数            Builder customReqConf = RequestConfig.custom();            if (connTimeout != null) {                customReqConf.setConnectTimeout(connTimeout);            }            if (readTimeout != null) {                customReqConf.setSocketTimeout(readTimeout);            }            post.setConfig(customReqConf.build());            HttpResponse res;            if (url.startsWith("https")) {                // 执行 Https 请求.                client = createSSLInsecureClient();                res = client.execute(post);            } else {                // 执行 Http 请求.                client = HttpClientUtils.client;                res = client.execute(post);            }            result = IOUtils.toString(res.getEntity().getContent(), charset);        } finally {            post.releaseConnection();            if (url.startsWith("https") && client != null && client instanceof CloseableHttpClient) {                ((CloseableHttpClient) client).close();            }        }        return result;    }    public static void main(String[] args) {        try {            String str = get("http://www.csdn.net");            System.out.println(str);        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}