cas 单点登录出现org.jasig.cas.client.util.CommonUtils.getResponseFromServer - 拒绝连接 Connection refused

cas 单点登录出现org.jasig.cas.client.util.CommonUtils.getResponseFromServer - 拒绝连接 Connection refused

环境：

• CentOS Linux release 7.2.1511 (Core)
• cas-client-core-3.1.12.jar

最近在对cas环境进行切换，原来好好的环境。部署在新环境下却出现org.jasig.cas.client.util.CommonUtils.getResponseFromServer - 拒绝连接异常。

2016-08-18 17:05:08.718 [http-bio-8080-exec-9] ERROR org.jasig.cas.client.util.CommonUtils.getResponseFromServer - 拒绝连接
java.net.ConnectException: 拒绝连接
        at java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:1.7.0_80]
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) ~[na:1.7.0_80]
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) ~[na:1.7.0_80]
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) ~[na:1.7.0_80]
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.7.0_80]
        at java.net.Socket.connect(Socket.java:579) ~[na:1.7.0_80]
        at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:625) ~[na:1.7.0_80]
        at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:160) ~[na:1.7.0_80]
        at sun.net.NetworkClient.doConnect(NetworkClient.java:180) ~[na:1.7.0_80]
        at sun.net.www.http.HttpClient.openServer(HttpClient.java:432) ~[na:1.7.0_80]
        at sun.net.www.http.HttpClient.openServer(HttpClient.java:527) ~[na:1.7.0_80]
        at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264) ~[na:1.7.0_80]
        at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367) ~[na:1.7.0_80]
        at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191) ~[na:1.7.0_80]
        at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:933) ~[na:1.7.0_80]
        at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177) ~[na:1.7.0_80]
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1301) ~[na:1.7.0_80]
        at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254) ~[na:1.7.0_80]
        at org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:313) [cas-client-core-3.1.12.jar:na]
        at org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:291) [cas-client-core-3.1.12.jar:na]
        at org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.retrieveResponseFromServer(AbstractCasProtocolUrlBasedTicketValidator.java:32) [cas-client-core-3.1.12.jar:na]
        at org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:187) [cas-client-core-3.1.12.jar:na]
        at org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:164) [cas-client-core-3.1.12.jar:na]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.68]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.68]
        at org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:102) [cas-client-core-3.1.12.jar:na]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.68]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.68]
        at org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:65) [cas-client-core-3.1.12.jar:na]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.68]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.68]
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85) [spring-web-4.2.2.RELEASE.jar:4.2.2.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.2.2.RELEASE.jar:4.2.2.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.68]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.68]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) [catalina.jar:7.0.68]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) [catalina.jar:7.0.68]
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) [catalina.jar:7.0.68]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) [catalina.jar:7.0.68]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) [catalina.jar:7.0.68]
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) [catalina.jar:7.0.68]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) [catalina.jar:7.0.68]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436) [catalina.jar:7.0.68]
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078) [tomcat-coyote.jar:7.0.68]
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625) [tomcat-coyote.jar:7.0.68]
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) [tomcat-coyote.jar:7.0.68]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_80]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_80]
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-coyote.jar:7.0.68]
        at java.lang.Thread.run(Thread.java:745) [na:1.7.0_80]

找了很久也找不到是什么原因，最后换了一种链接方式后问题才得以解决。估计这是个bug。

修改org.jasig.cas.client.util.CommonUtils类的public static String getResponseFromServer(final URL constructedUrl, final HostnameVerifier hostnameVerifier, final String encoding)方法。

将原有的

public static String getResponseFromServer(final URL constructedUrl, final HostnameVerifier hostnameVerifier, final String encoding) {
        URLConnection conn = null;
        try {
        conn = constructedUrl.openConnection();
        if (conn instanceof HttpsURLConnection) {
            ((HttpsURLConnection)conn).setHostnameVerifier(hostnameVerifier);
        }
        final BufferedReader in;

        if (CommonUtils.isEmpty(encoding)) {
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        } else {
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), encoding));
        }

        String line;
        final StringBuilder stringBuffer = new StringBuilder(255);

        while ((line = in.readLine()) != null) {
            stringBuffer.append(line);
            stringBuffer.append("\n");
        }

        return stringBuffer.toString();

    } catch (final Exception e) {
        LOG.error(e.getMessage(), e);
        throw new RuntimeException(e);
    } finally {
        if (conn != null && conn instanceof HttpURLConnection) {
            ((HttpURLConnection)conn).disconnect();
        }
    }

}

cas客户端作如下修改

• 添加远程连接类：

public class HttpRemote {
    /**
     * 以Post方法访问
     * @param url 请求地址
     * @param argsMap 携带的参数
     * @return String 返回结果
     * @throws Exception
     */
    public static String POSTMethod(String url, Map<String, Object> argsMap) throws Exception {
        byte[] dataByte = null;

        // 创建HttpClientBuilder
        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
        // HttpClient
        CloseableHttpClient httpClient = httpClientBuilder.build();

        HttpPost httpPost = new HttpPost(url);
        // 设置参数
        UrlEncodedFormEntity encodedFormEntity = new UrlEncodedFormEntity(setHttpParams(argsMap), "UTF-8");
        httpPost.setEntity(encodedFormEntity);
        // 执行请求
        HttpResponse httpResponse = httpClient.execute(httpPost);
        // 获取返回的数据
        HttpEntity httpEntity = httpResponse.getEntity();
        if (httpEntity != null) {
            byte[] responseBytes = getData(httpEntity);
            dataByte = responseBytes;
            httpPost.abort();
        }
        // 将字节数组转换成为字符串
        String result = bytesToString(dataByte);
        return result;
    }
}

• 将getResponseFromServer方法修改为：

public static String getResponseFromServer(final URL constructedUrl, final HostnameVerifier hostnameVerifier, final String encoding) {
    URLConnection conn = null;
    try {
//            conn = constructedUrl.openConnection();
//            if (conn instanceof HttpsURLConnection) {
//                ((HttpsURLConnection)conn).setHostnameVerifier(hostnameVerifier);
//            }
//            final BufferedReader in;
//
//            if (CommonUtils.isEmpty(encoding)) {
//                in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
//            } else {
//                in = new BufferedReader(new InputStreamReader(conn.getInputStream(), encoding));
//            }
//
//            String line;
        final StringBuilder stringBuffer = new StringBuilder(255);
//
//            while ((line = in.readLine()) != null) {
//                stringBuffer.append(line);
//                stringBuffer.append("\n");
//            }

        stringBuffer.append(HttpRemote.POSTMethod(constructedUrl.toString(),null));


        return stringBuffer.toString();

    } catch (final Exception e) {
        LOG.error(e.getMessage(), e);
        throw new RuntimeException(e);
    } finally {
        if (conn != null && conn instanceof HttpURLConnection) {
            ((HttpURLConnection)conn).disconnect();
        }
    }

}

重新打包重启即可。