解决PKIX path building failed错误 javasslPKIXSSLException证书

调用接口出现以下异常：

[FRIP]2018-08-13 15:23:51 [DEBUG] - org.apache.commons.httpclient.HttpConnection(1228) -Exception caught when closing output
javax.net.ssl.SSLException: Connection has been shutdown: 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

查找之后发现是用SSL连接接口，因服务器不能信任对方的证书导致。试验了几种方法，最终用以下方法解决了问题，连接地址：http://www.cnblogs.com/wanghaixing/p/5630070.html