http://mengyang.iteye.com/blog/575671
第一次遇到一个这样的问题，"PKIX path building failed" 异常
详解异常: http://www.cnblogs.com/aurawing/articles/1899217.html
大概意思是，证书出问题了，服务器不信任我们自己创建的证书。
两种解决方法
1.请求时添加代码忽略证书信任问题
我用httpClient，简单明了的两句代码(支持SSL，也就是以https://开头的，一般是http://)
Protocol myhttps = new Protocol("https", new MySecureProtocolSocketFactory(), 443);
Protocol.registerProtocol("https", myhttps);
2.代码控制证书生成，导入，再请求
成功例子：
private static void testLogin()
{
try
{
String callback_url = "http://www.wedfvd.com";
TSohu tsohu = new TSohu(AConstants.TSOHU_APP_KEY,AConstants.TSOHU_APP_KEY_SECRET);
TSohuOAuthClient oc = new TSohuOAuthClient();//OAuth认证授权以及签名相关
TSohuOAuth requestOAuth = oc.requestToken(tsohu);
//hd=default&
// String authorizeUrl = "http://api.t.sohu.com/oauth/authorize?oauth_token="
// + requestOAuth.getOauth_token() + "&oauth_callback=" + callback_url;
HttpClient httpClient = new HttpClient();
String loginUrl = "https://passport.sohu.com/sso/login.jsp?appid=1073&persistentcookie=1&s="+new Date().getTime()+"&b=6&w=1024&pwdtype=1&v=26";
loginUrl += "&userid="+URLEncoder.encode("[email protected]", "utf-8")+"&password="+MD5Util.encrypt("123456");
Protocol myhttps = new Protocol("https", new MySecureProtocolSocketFactory(), 443);
Protocol.registerProtocol("https", myhttps);
GetMethod get = new GetMethod(loginUrl);
int status = httpClient.executeMethod(get);
// System.out.println(status+" "+get.getResponseBodyAsString());
PostMethod post = new PostMethod("http://api.t.sohu.com/oauth/authorize");
post.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
post.getParams().setParameter("http.protocol.cookie-policy", CookiePolicy.BROWSER_COMPATIBILITY);
post.getParams().setParameter("http.protocol.single-cookie-header", true);
NameValuePair[] params = new NameValuePair[]{
new NameValuePair("oauth_token", requestOAuth.getOauth_token()),
new NameValuePair("oauth_callback", callback_url)
};
post.setRequestBody(params);
int statusCode = httpClient.executeMethod(post);
// String response = post.getResponseBodyAsString();
// System.out.println(statusCode+" "+response);
if (post.getResponseHeader("Location") != null) {
String location = post.getResponseHeader("Location").getValue();
String oauthVerifier = StringUtils.substringAfter(location, "oauth_verifier=");
// System.out.println(oauthVerifier);
requestOAuth.setOauth_verifier(oauthVerifier);
TSohuOAuth accessOAuth = oc.accessToken(requestOAuth);
TSohuAccessToken accessToken = new TSohuAccessToken(accessOAuth.getOauth_token(),accessOAuth.getOauth_token_secret());
tsohu.setToken(accessToken);
User user = tsohu.verify_credentials();
accessToken.setUserid(Long.valueOf(user.getId()));
accessToken.setScreen_name(user.getScreenName());
System.out.println("搜狐微博用户"+user.getScreenName()+"授权码：");
System.out.println("token："+accessToken.getToken());
System.out.println("tokenSecret："+accessToken.getTokenSecret());
} else {
if (statusCode != 200) {
throw new RuntimeException("访问网络资源出现问题，错误码为： " + statusCode);
}
}
} catch (Exception e)
{
e.printStackTrace();
}
}