本文主要是介绍http系列 - SSL请求，需要JKS证书的情况，如何做连接，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
有些响应https请求的接口，需要在客户端添加证书的情况，其目的是加密在网络之间传输的请求报文，保证信息安全；
证书的加密方式多种多样，本案例以JKS加密的证书为例：
1.获取证书私钥PrivateKey
private static PrivateKey getPrivateKey(String priKeyFile, String storePassword) throws Exception {char[] storePwdArr;int i;BufferedInputStream bis = null;try {KeyStore ks = KeyStore.getInstance("JKS");//加载证书FileInputStream fis = new FileInputStream(priKeyFile);bis = new BufferedInputStream(fis);//证书中的加密keyString storeAlias = "signKey";storePwdArr = new char[storePassword.length()];// store passwordfor (i = 0; i < storePassword.length(); i++) {storePwdArr[i] = storePassword.charAt(i);}ks.load(bis, storePwdArr);PrivateKey priv = (PrivateKey) ks.getKey(storeAlias, storePwdArr);return priv;} catch (KeyStoreException e) {e.printStackTrace();throw new Exception("1");} catch (FileNotFoundException e) {e.printStackTrace();throw new Exception("2", e);} catch (NoSuchAlgorithmException e) {e.printStackTrace();throw new Exception("3", e);} catch (CertificateException e) {e.printStackTrace();throw new Exception("4", e);} catch (IOException e) {e.printStackTrace();throw new Exception("5", e);} catch (UnrecoverableKeyException e) {e.printStackTrace();throw new Exception("6", e);} finally {if (bis != null) {try {bis.close();} catch (IOException e) {e.printStackTrace();}}}}SSL实现（HTTP请求）：
1.请求构建：
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpConnectionManager;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
import org.apache.commons.httpclient.methods.ByteArrayRequestEntity;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;
import org.apache.commons.httpclient.params.HttpConnectionManagerParams;
import org.apache.commons.httpclient.protocol.Protocol;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;/*** HTTP请求* */
public class HttpRequestUtil
{final static String PROTOCOL_NAME = "https";private static final Logger logger = LoggerFactory.getLogger(HttpRequestUtil.class);public static String sendJsonWithHttp(String surl, String json) throws Exception{URL url = new URL(surl);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");conn.setRequestMethod("POST");// 提交模式conn.setRequestProperty("Content-Length", json.getBytes().length + "");conn.setConnectTimeout(100000);// 连接超时单位毫秒 //conn.setReadTimeout(200000);// 读取超时 单位毫秒conn.setDoOutput(true);// 是否输入参数conn.setDoInput(true);conn.setUseCaches(false);conn.connect();DataOutputStream out = new DataOutputStream(conn.getOutputStream());out.write(json.getBytes());out.flush();out.close();BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));StringBuffer sb = new StringBuffer();String line;while ((line = reader.readLine()) != null){sb.append(line);}reader.close();conn.disconnect();return sb.toString();}public static String https(String surl, String json){HttpClient client =getHttpClient();client.getParams().setContentCharset("UTF-8");PostMethod post = new PostMethod(surl);ByteArrayOutputStream baos = new ByteArrayOutputStream();Protocol httpProtocol;try {//声明协议类型httpProtocol = new Protocol(PROTOCOL_NAME, new SSLProtocolSocketFactory(false), 443);Protocol.registerProtocol(PROTOCOL_NAME, httpProtocol);//声明报文格式post.setRequestHeader("Content-Type", "application/json;charset=utf-8");RequestEntity requestEntity = null;requestEntity = new ByteArrayRequestEntity(json.getBytes("utf-8"));post.setRequestEntity(requestEntity);//执行调用client.executeMethod(post);String off = "ON";InputStream in = null;in = post.getResponseBodyAsStream();byte[] buf = new byte[2048];do{int n = in.read(buf);;if (n > 0){baos.write(buf, 0, n);}else if (n <= 0){break;}} while (true);}catch (HttpException e) { logger.info("http exception when send http.", e); } catch (IOException e) { logger.info("io exception when send http.", e); }finally {post.releaseConnection(); httpProtocol=null;}return baos.toString();}private static HttpClient httpClient=null;public static HttpClient getHttpClient(){if(httpClient==null){HttpConnectionManager httpConnectionManager = new MultiThreadedHttpConnectionManager();HttpConnectionManagerParams params = httpConnectionManager.getParams();params.setConnectionTimeout(1000*60); params.setSoTimeout(20000); //避免异常的两行diamanteparams.setDefaultMaxConnectionsPerHost(1000);params.setMaxTotalConnections(2000);httpClient = new HttpClient(httpConnectionManager);}return httpClient;}
}2.SSLProtocolSocketFactory必不可少
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;import javax.net.SocketFactory;import org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.params.HttpConnectionParams;
import org.apache.commons.httpclient.protocol.ProtocolSocketFactory;/*** */
public class SSLProtocolSocketFactory implements ProtocolSocketFactory {private boolean isChkCert;public SSLProtocolSocketFactory(boolean chkCert) {this.isChkCert = chkCert;}@Overridepublic Socket createSocket(String host, int port, InetAddress localAddress, int localPort, HttpConnectionParams params) throws IOException, UnknownHostException, ConnectTimeoutException {if (params == null) {throw new IllegalArgumentException("Parameters may not be null!");}int timeout = params.getConnectionTimeout();SocketFactory socketFactory = SSLContextFactory.getInstance(this.isChkCert).getSocketFactory();if (timeout == 0) {return createSocket(host, port, localAddress, localPort);}Socket socket = socketFactory.createSocket();SocketAddress localAddress_ = new InetSocketAddress(localAddress, localPort);SocketAddress remoteAddress = new InetSocketAddress(host, port);socket.bind(localAddress_);socket.connect(remoteAddress, timeout);return socket;}@Overridepublic Socket createSocket(String host, int port, InetAddress localAddress, int localPort) throws IOException, UnknownHostException {return SSLContextFactory.getInstance(this.isChkCert).getSocketFactory().createSocket(host, port, localAddress, localPort);}@Overridepublic Socket createSocket(String host, int port) throws IOException, UnknownHostException {return SSLContextFactory.getInstance(this.isChkCert).getSocketFactory().createSocket(host, port);}
}3.SSLContextFactory
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;/*** */
public class SSLContextFactory {private static final Logger logger = LoggerFactory.getLogger(SSLContextFactory.class);private static SSLContext ctx;private final static String PROTOCAL_NAME = "SSL";public static SSLContext getInstance(boolean chkCert) {if (ctx == null) {try {ctx = SSLContext.getInstance(PROTOCAL_NAME);if (chkCert) {logger.error("请实现证书信任连接！");} else {ctx.init(null, new TrustManager[] {new TrustAnyTrustManager()}, new SecureRandom());}} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (KeyManagementException e) {e.printStackTrace();}return ctx;}return ctx;}
}
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