摘要：組件版本信息使用自帶的命令生成文件命令將拷貝到目錄下配置的目錄文件，在配置文件中新增配置將工程添加進并啟動，使用訪問和鏈接。原理后續進一步研究

1.組件版本信息
apache-tomcat-7.0.75
JDK 1.8.0_91

2.使用jdk自帶的keytool命令生成keystore文件test.keystore
命令：keytool -genkey -alias test123 -keypass test123 -keyalg RSA -keysize 1024 -keystore test.keystore -storepass test123

3.將test.keystore拷貝到apache-tomcat-7.0.75bin目錄下

4.配置tomcat的conf目錄server.xml文件，在配置文件中新增SSL配置

5.將webservice工程添加進tomcat并啟動，使用postman訪問http和https鏈接。http可以正常訪問，https訪問不了，由于客戶端證書問題

6.新建類HttpClientTest，用于配置https相關SSL設置

import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;  
import javax.net.ssl.SSLContext;   
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContextBuilder;

public class HttpClientTest
{
    public static CloseableHttpClient createSSLClient()
            throws KeyManagementException, NoSuchAlgorithmException,
            KeyStoreException
    {
        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, NoopHostnameVerifier.INSTANCE );
        return HttpClients.custom().setSSLSocketFactory( sslsf ).build();
    }
}

7.新建類HttpClientUtil，用于測試https的get請求

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import org.apache.commons.logging.Log;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.util.EntityUtils;

public class HttpClientUtil
{
    public static void main( String[] args ) throws ClientProtocolException,
            IOException, URISyntaxException, KeyManagementException,
            NoSuchAlgorithmException, KeyStoreException
    {
        String url = "https://localhost:8443/maven-example/hello";
        CloseableHttpClient httpClient = HttpClientTest.createSSLClient();
        HttpGet get = new HttpGet();
        get.setURI( new URI( url ) );
        HttpResponse response = httpClient.execute( get );
        String s = streamToString( response.getEntity().getContent() );
        System.out.println( s );
    }

    private static String streamToString( InputStream is )
            throws IOException
    {

        String line = "";
        StringBuilder total = new StringBuilder();
        BufferedReader rd = new BufferedReader( new InputStreamReader( is ) );
        while ( (line = rd.readLine()) != null )
        {
            total.append( line );
        }
        return total.toString();
    }
}

8.執行main方法，正確輸出https的response響應

9.操作過程中遇到一個問題，報主機名驗證錯誤

解決方法：將new SSLConnectionSocketFactory(sslContext)修改為new SSLConnectionSocketFactory(sslContext, NoopHostnameVerifier.INSTANCE)即可。原理后續進一步研究

SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
                sslContext);
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
                sslContext, NoopHostnameVerifier.INSTANCE);