解决Java在请求某些不受信任的https网站时会报：PKIX path building failed

Java在请求某些不受信任的https网站时会报：

发送GET请求出现异常！javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.ssl.Alerts.getSSLException(Unknown Source)
at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source)
at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source)
at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
at sun.security.ssl.Handshaker.processLoop(Unknown Source)
at sun.security.ssl.Handshaker.process_record(Unknown Source)
at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(Unknown Source)
at com.pachong.util.http.HttpRequest.sendGet(HttpRequest.java:51)
at com.pachong.util.http.HttpRequest.main(HttpRequest.java:130)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.validator.PKIXValidator.doBuild(Unknown Source)
at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
at sun.security.validator.Validator.validate(Unknown Source)
at sun.security.ssl.X509TrustManagerImpl.validate(Unknown Source)
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
... 13 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.build(Unknown Source)
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
at java.security.cert.CertPathBuilder.build(Unknown Source)
... 19 more

解决办法：

1、手动导入证书到本地证书库

2、信任所有SSL证书

最好的解决办法或许是信任所有SSL证书，因为某些时候不能每次都手动的导入证书非常麻烦。现在封装了个方法，在连接openConnection的时候忽略掉证书就行了。

先说第二种 用程序重写方法  信任所有SSL证书

新建一个工具类SslUtil.java  在打开连接之前调用此类 ignoreSsl()方法

package SslUtils;import java.security.cert.CertificateException;import java.security.cert.X509Certificate;import javax.net.ssl.HostnameVerifier;import javax.net.ssl.HttpsURLConnection;import javax.net.ssl.SSLContext;import javax.net.ssl.SSLSession;import javax.net.ssl.TrustManager;import javax.net.ssl.X509TrustManager;public class SslUtil {private static void trustAllHttpsCertificates() throws Exception {      TrustManager[] trustAllCerts = new TrustManager[1];      TrustManager tm = new miTM();      trustAllCerts[0] = tm;      SSLContext sc = SSLContext.getInstance("SSL");      sc.init(null, trustAllCerts, null);      HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());  }    static class miTM implements TrustManager,X509TrustManager {      public X509Certificate[] getAcceptedIssuers() {          return null;      }        public boolean isServerTrusted(X509Certificate[] certs) {          return true;      }        public boolean isClientTrusted(X509Certificate[] certs) {          return true;      }        public void checkServerTrusted(X509Certificate[] certs, String authType)              throws CertificateException {          return;      }        public void checkClientTrusted(X509Certificate[] certs, String authType)              throws CertificateException {          return;      }  }     /**  * 忽略HTTPS请求的SSL证书，必须在openConnection之前调用  * @throws Exception  */  public static void ignoreSsl() throws Exception{      HostnameVerifier hv = new HostnameVerifier() {          public boolean verify(String urlHostName, SSLSession session) {              System.out.println("Warning: URL Host: " + urlHostName + " vs. " + session.getPeerHost());              return true;          }      };      trustAllHttpsCertificates();      HttpsURLConnection.setDefaultHostnameVerifier(hv);  }  }

另外一种方法 导入证书

例如下载360 的安全证书，使用浏览器打开要调用的接口链接：https://api.e.360.cn/account/clientLogin，然后查看证书导出证书到本地，文件名取成 调用api的域名api.e.360.cn

将数字证书保存到jdk1.6.0_17\jre\lib\security，  将该目录下的
cacerts 设置成可读写权限。
在该目录下打开cmd    运行
keytool -import -trustcacerts -alias api.e.360.cn -file api.e.360.cn.cer -keystore cacerts -storepass changeit 
注意：cacerts 文件的读写权是否有