【编程】HttpClient解决SSL证书问题

使用httpclient访问https网站时，可能遇到SSLHandshakeException。其根本原因是我们模拟的HttpClient没有SSL证书。

虽然我们可以通过设置Java来解决，但为了保证在各个环境都能正常运行代码，更健壮的方案是忽略掉SSL的检查。

详细代码如下，通过该类获取的CloseableHttpClient，在访问https网站时会自动忽略SSL检查：

package erica.jewels.blackpearl;

import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

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.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;

public class SslUtils {
	
	public static CloseableHttpClient SslHttpClientBuild() {
		Registry socketFactoryRegistry = RegistryBuilder.create().register("http", PlainConnectionSocketFactory.INSTANCE).register("https", trustAllHttpsCertificates()).build();
		PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
		CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(connectionManager).build();
		return httpClient;
	}
	
	private static SSLConnectionSocketFactory trustAllHttpsCertificates() {
		SSLConnectionSocketFactory socketFactory = null;
		TrustManager[] trustAllCerts = new TrustManager[1];
		TrustManager tm = new miTM();
		trustAllCerts[0] = tm;
		SSLContext sc = null;
		try {
			sc = SSLContext.getInstance("TLS");
			sc.init(null, trustAllCerts, null);
			socketFactory = new SSLConnectionSocketFactory(sc, NoopHostnameVerifier.INSTANCE);
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (KeyManagementException e) {
			e.printStackTrace();
		}
		return socketFactory;
	}
	
	static class miTM implements TrustManager, X509TrustManager {
		
		public X509Certificate[] getAcceptedIssuers() {
			return null;
		}
		
		public void checkServerTrusted(X509Certificate[] certs, String authType) {
			//don't check
		}
		
		public void checkClientTrusted(X509Certificate[] certs, String authType) {
			//don't check
		}
	}
}