httpClient 有关SSL证书的处理。
avax.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 com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(Unknown Source)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(Unknown Source)
at com.sun.net.ssl.internal.ssl.AppOutputStream.write(Unknown Source)
at java.io.BufferedOutputStream.flushBuffer(Unknown Source)
at java.io.BufferedOutputStream.flush(Unknown Source)
at org.apache.commons.httpclient.methods.EntityEnclosingMethod.writeRequestBody(EntityEnclosingMethod.java:506)
at org.apache.commons.httpclient.HttpMethodBase.writeRequest(HttpMethodBase.java:2114)
at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1096)
at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:398)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
at com.leg3s.comm.utils.AppHttpClient.execute(AppHttpClient.java:82)
at com.leg3s.comm.utils.AppHttpClient.executeHttpMethod(AppHttpClient.java:63)
at com.leg3s.pay.ring.utils.RingPayThread.run(RingPayThread.java:43)
at java.lang.Thread.run(Unknown Source)
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 com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(Unknown Source)
at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
... 21 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
at java.security.cert.CertPathBuilder.build(Unknown Source)
... 27 more
在用httpClient访问网站的时候出现以上错误，在网上搜了一下，
处理的方法大概是先获取证书生成相应文件，然后再加载。
我想问一下httpClient的自动处理的方法，或者有没有相关的组件可以自动处理？
[解决办法]
楼主，你这是缺证书，证书可以通过IE来获得：
1． 用IE打开需要连接的https网址，会弹出如下对话框：
2． 单击"View Certificate"，在弹出的对话框中选择"Details"，然后再单击"Copy to File"，根据提供的向导生成待访问网页的证书文件
3． 向导第一步，欢迎界面，直接单击"Next"，
4． 向导第二步，选择导出的文件格式，默认，单击"Next"，
5． 向导第三步，输入导出的文件名，输入后，单击"Next"，
6． 向导第四步，单击"Finish"，完成向导
7． 最后弹出一个对话框，显示导出成功
用keytool工具把刚才导出的证书倒入本地keystore。Keytool命令在<java-home>\bin\下，打开命令行窗口，并到<java-home>\lib\security\目录下，运行下面的命令：
keytool -import -noprompt -keystore cacerts -storepass changeit -alias yourEntry1 -file your.cer
其中参数alias后跟的值是当前证书在keystore中的唯一标识符，但是大小写不区分；参数file后跟的是刚才通过IE导出的证书所在的路径和文件名；如果你想删除刚才导入到keystore的证书，可以用命令：
keytool -delete -keystore cacerts -storepass changeit -alias yourEntry1
添加证书后就能解决问题。
[解决办法]
我想问一下httpClient的自动处理的方法，或者有没有相关的组件可以自动处理？
一楼正解，没有自动处理。
你运行httpclient的时候指定-Djavax.net.ssl.trustStore=$keyfile_path就行了
注意keyfile_path按照一楼说的 把证书导进去
