在java中使用https访问数据时报异常：

Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

需要使用keytool工具，将对应域名的证书导入到jdk的cacerts中，这个证书可以是*.crt，*.cer等证书

cacerts包含了很多CA证书，位置在Java的安装目录： Java\jdk1.8.0_181\jre\lib\security\cacerts

执行如下命令，可将证书导入到cacerts中，使其成为可信证书:

cd D:\IDE\Java\jdk1.8.0_181\jre\lib\security
keytool -importcert -alias httpfs -keystore cacerts -file D:\IDE\Java\jdk1.8.0_181\jre\lib\security\ssl.cer

需要输入cacerts证书库密码：changeit

如果没有证书，可以使用Chrome浏览器访问https域名，下载对应的证书，详情请参照：https://blog.csdn.net/qq_31222053/article/details/94174506

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