上一篇文章中，简单分享一下封装HttpClient工具类的思路及部分代码，本文将分享如何实现插件式配置HttpClient对象。

       如果你看过我前面的几篇关于HttpClient的文章或者官网示例，应该都知道HttpClient对象在创建时，都可以设置各种参数，但是却没有简单的进行封装，比如对我来说比较重要的3个：代理、ssl（包含绕过证书验证和自定义证书验证）、超时。还需要自己写。所以这里我就简单封装了一下，顺便还封装了一个连接池的配置。

       其实说是插件式配置，那是高大上的说法，说白了，就是采用了建造者模式来创建HttpClient对象（级联调用）。HttpClient的jar包中提供了一个创建HttpClient对象的类HttpClientBuilder。所以我是创建该类的子类HCB，然后做了一些改动。每个配置方法的返回值都是HCB，这样就支持级联调用了。具体代码如下：

package com.tgb.ccl.http.httpclient.builder;

import org.apache.http.HttpHost;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.DefaultProxyRoutePlanner;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;

import com.tgb.ccl.http.common.SSLs;
import com.tgb.ccl.http.exception.HttpProcessException;

/**
 * httpclient创建者
 * 
 * @author arron
 * @date 2015年11月9日 下午5:45:47 
 * @version 1.0
 */
public class  HCB extends HttpClientBuilder{
	
	private boolean isSetPool=false;//记录是否设置了连接池
	private boolean isNewSSL=false;//记录是否设置了更新了ssl
	
	//用于配置ssl
	private SSLs ssls = SSLs.getInstance();
	
	private HCB(){}
	public static HCB custom(){
		return new HCB();
	}

	/**
	 * 设置超时时间
	 * 
	 * @param timeout		超市时间，单位-毫秒
	 * @return
	 */
	public HCB timeout(int timeout){
		 // 配置请求的超时设置
        RequestConfig config = RequestConfig.custom()
                .setConnectionRequestTimeout(timeout)
                .setConnectTimeout(timeout)
                .setSocketTimeout(timeout)
                .build();
		return (HCB) this.setDefaultRequestConfig(config);
	}
	
	/**
	 * 设置ssl安全链接
	 * 
	 * @return
	 * @throws HttpProcessException
	 */
	public HCB ssl() throws HttpProcessException {
		if(isSetPool){//如果已经设置过线程池，那肯定也就是https链接了
			if(isNewSSL){
				throw new HttpProcessException("请先设置ssl，后设置pool");
			}
			return this;
		}
		Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder
				.<ConnectionSocketFactory> create()
				.register("http", PlainConnectionSocketFactory.INSTANCE)
				.register("https", ssls.getSSLCONNSF()).build();
		//设置连接池大小
		PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
		return (HCB) this.setConnectionManager(connManager);
	}
	

	/**
	 * 设置自定义sslcontext
	 * 
	 * @param keyStorePath		密钥库路径
	 * @return
	 * @throws HttpProcessException
	 */
	public HCB ssl(String keyStorePath) throws HttpProcessException{
		return ssl(keyStorePath,"nopassword");
	}
	/**
	 * 设置自定义sslcontext
	 * 
	 * @param keyStorePath		密钥库路径
	 * @param keyStorepass		密钥库密码
	 * @return
	 * @throws HttpProcessException
	 */
	public HCB ssl(String keyStorePath, String keyStorepass) throws HttpProcessException{
		this.ssls = SSLs.custom().customSSL(keyStorePath, keyStorepass);
		this.isNewSSL=true;
		return ssl();
	}
	
	
	/**
	 * 设置连接池（默认开启https）
	 * 
	 * @param maxTotal					最大连接数
	 * @param defaultMaxPerRoute	每个路由默认连接数
	 * @return
	 * @throws HttpProcessException
	 */
	public HCB pool(int maxTotal, int defaultMaxPerRoute) throws HttpProcessException{
		Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder
				.<ConnectionSocketFactory> create()
				.register("http", PlainConnectionSocketFactory.INSTANCE)
				.register("https", ssls.getSSLCONNSF()).build();
		//设置连接池大小
		PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
		connManager.setMaxTotal(maxTotal);
		connManager.setDefaultMaxPerRoute(defaultMaxPerRoute);
		isSetPool=true;
		return (HCB) this.setConnectionManager(connManager);
	}
	
	/**
	 * 设置代理
	 * 
	 * @param hostOrIP		代理host或者ip
	 * @param port			代理端口
	 * @return
	 */
	public HCB proxy(String hostOrIP, int port){
		// 依次是代理地址，代理端口号，协议类型  
		HttpHost proxy = new HttpHost(hostOrIP, port, "http");  
		DefaultProxyRoutePlanner routePlanner = new DefaultProxyRoutePlanner(proxy);
		return (HCB) this.setRoutePlanner(routePlanner);
	}
}

       大家可以看到，这个有成员变量，而且不是static类型，所以是非线程安全的。所以我为了方便使用，就效仿HttpClients（其custom方法可以创建HttpClientBuilder实例）写了一个静态的custom方法，来返回一个新的HCB实例。将构造方法设置成了private，无法通过new的方式创建实例，所以只能通过custom方法来创建。在想生成HttpClient对象的时候，调用一下build方法就可以了。于是乎就出现了这样简单、方便又明了的调用方式：

	HttpClient client = HCB.custom().timeout(10000).proxy("127.0.0.1", 8087).ssl("D:\\keys\\wsriakey","tomcat").build();

       说到ssl，还需要另外一个封装的类，为了其他工具类有可能也会用到ssl，所以就单出来了。不多解释，直接上代码：

/**
 * 设置ssl
 * 
 * @author arron
 * @date 2015年11月3日 下午3:11:54
 * @version 1.0
 */
public class SSLs {

    private static final SSLHandler simpleVerifier = new SSLHandler();
	private static SSLConnectionSocketFactory sslConnFactory ;
	private static SSLs sslutil = new SSLs();
	private SSLContext sc;
	
	public static SSLs getInstance(){
		return sslutil;
	}
	public static SSLs custom(){
		return new SSLs();
	}

    // 重写X509TrustManager类的三个方法,信任服务器证书
    private static class SSLHandler implements  X509TrustManager, HostnameVerifier{
		
		@Override
		public java.security.cert.X509Certificate[] getAcceptedIssuers() {
			return null;
		}
		
		@Override
		public void checkServerTrusted(java.security.cert.X509Certificate[] chain,
				String authType) throws java.security.cert.CertificateException {
		}
		
		@Override
		public void checkClientTrusted(java.security.cert.X509Certificate[] chain,
				String authType) throws java.security.cert.CertificateException {
		}

		@Override
		public boolean verify(String paramString, SSLSession paramSSLSession) {
			return true;
		}
	};
    
	// 信任主机
    public static HostnameVerifier getVerifier() {
        return simpleVerifier;
    }
    
    public synchronized SSLConnectionSocketFactory getSSLCONNSF() throws HttpProcessException {
    	if (sslConnFactory != null)
    		return sslConnFactory;
    	try {
	    	SSLContext sc = getSSLContext();
	    	sc.init(null, new TrustManager[] { simpleVerifier }, null);
	    	sslConnFactory = new SSLConnectionSocketFactory(sc, simpleVerifier);
		} catch (KeyManagementException e) {
			throw new HttpProcessException(e);
		}
    	return sslConnFactory;
    }
    
    public SSLs customSSL(String keyStorePath, String keyStorepass) throws HttpProcessException{
    	FileInputStream instream =null;
    	KeyStore trustStore = null; 
		try {
			trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
			instream = new FileInputStream(new File(keyStorePath));
	     	trustStore.load(instream, keyStorepass.toCharArray());
            // 相信自己的CA和所有自签名的证书
	     	sc= SSLContexts.custom().loadTrustMaterial(trustStore, new TrustSelfSignedStrategy()) .build();	
		} catch (KeyStoreException | NoSuchAlgorithmException | CertificateException | IOException | KeyManagementException e) {
			throw new HttpProcessException(e);
		}finally{
			try {
				instream.close();
			} catch (IOException e) {}
		}
		return this;
    }
    
    public SSLContext getSSLContext() throws HttpProcessException{
    	try {
    		if(sc==null){
    			sc = SSLContext.getInstance("SSLv3");
    		}
			return sc;
		} catch (NoSuchAlgorithmException e) {
			throw new HttpProcessException(e);
		}
    }
}

       基本上就是这样了。在上一篇中遗留了一个小问题，正好在这里说一下。上一篇文中说道提供一个默认的HttpClient实现，其实是2个，分别针对于http和https。方便调用。具体代码如下：

	//默认采用的http协议的HttpClient对象
	private static  HttpClient client4HTTP;
	
	//默认采用的https协议的HttpClient对象
	private static HttpClient client4HTTPS;
	
	static{
		try {
			client4HTTP = HCB.custom().build();
			client4HTTPS = HCB.custom().ssl().build();
		} catch (HttpProcessException e) {
			logger.error("创建https协议的HttpClient对象出错：{}", e);
		}
	}
	
	/**
	 * 判断url是http还是https，直接返回相应的默认client对象
	 * 
	 * @return						返回对应默认的client对象
	 * @throws HttpProcessException 
	 */
	private static HttpClient create(String url) throws HttpProcessException  {
		if(url.toLowerCase().startsWith("https://")){
			return client4HTTPS;
		}else{
			return client4HTTP;
		}
	}

	public static void testSimple() throws HttpProcessException{
		String url = "http://tool.oschina.net/";
		//简单调用
		String resp = HttpClientUtil.send(url);
		System.out.println("请求结果内容长度："+ resp);
	}

       好了，插件化配置HttpClient，就是这些内容，在下一篇文章中分享如何插件式配置Header。没错，思路还是跟本文一样。敬请期待吧。

       代码已上传至：https://github.com/Arronlong/httpclientUtil。

       httpclientUtil （QQ交流群:548452686 ）