超详细HttpClient加载安全证书post请求访问https示例
(注：此测试java版本为1.7，经过测试java7以上(不含java7)的版本无需加载安全证书，也无需绕过安全证书就可以通过建立httpClient连接访问https网站，所以如果项目环境为Java7以上的小伙伴就不用考虑这些问题啦。)
最近公司爬虫项目因为一个网站的SSL证书升级问题，导致使用httpClient绕过SSL证书方法失效，因此尝试将该网站安全证书下载下来，将其加载到连接中去，经测试后成功问题解决。
浏览器(以chrome为例)访问/，点击域名左侧的小锁，可以查看该网站的证书信息，将信息证书导出，我这里保存为cer格式，路径为D:\Java\apapanet.cer。
接下来就是代码了，代码如下：
import java.io.FileInputStream;import java.security.KeyStore;import java.security.cert.Certificate;import java.security.cert.CertificateFactory;import .ssl.SSLContext;import .ssl.TrustManagerFactory;import mons.lang3.StringUtils;import org.apache.http.HttpStatus;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpPost;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.util.EntityUtils;public class httpClient{public static void main(String[] args) throws Exception {// Load CertificateCertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");// 这里的路径为证书存放路径Certificate certificate = certificateFactory.generateCertificate(new FileInputStream("D:\\Java\\apapanet.cer"));// Create TrustStoreKeyStore trustStoreContainingTheCertificate = KeyStore.getInstance("JKS");trustStoreContainingTheCertificate.load(null, null);// AddCertificate第一个参数为证书别名, 可以任取trustStoreContainingTheCertificate.setCertificateEntry("XYZ", certificate);TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm()); trustManagerFactory.init(trustStoreContainingTheCertificate);// Create SSLContext我这里协议为TLSv1.2SSLContext sslContext = SSLContext.getInstance("TLSv1.2");sslContext.init(null,trustManagerFactory.getTrustManagers(),null);SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory(sslContext);// Create custom httpClient创建自定义httpClient连接CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(sslConnectionSocketFactory).build(); try{// POST请求HttpPost method = new HttpPost("/");System.out.println("executing request" + method.getRequestLine());method.setHeader("Content-type", "application/json;charset=utf-8");method.setHeader("Accept", "application/json");CloseableHttpResponse response = null;response = httpClient.execute(method);int status = response.getStatusLine().getStatusCode();if (status == HttpStatus.SC_OK) {String body = EntityUtils.toString(response.getEntity());if(StringUtils.isNotBlank(body)){System.out.println("body: "+body);}}response.close();} finally {httpClient.close();}}}
测试通过成功返回页面数据~~
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