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！.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
.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 .www.protocol.https.HttpsClient.afterConnect(Unknown Source)
at .www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
at .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 .ssl.HostnameVerifier;import .ssl.HttpsURLConnection;import .ssl.SSLContext;import .ssl.SSLSession;import .ssl.TrustManager;import .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./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.
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. -file api..cer -keystore cacerts -storepass changeit
注意：cacerts 文件的读写权是否有
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