java https网络问题

Question

我正在尝试实现最简单的HTTPS通信程序.网上有很多例子,但我无法成功运行它们.
这是一个例子:

public class ReadHttpsURL1 {
   static final int HTTPS_PORT = 443; 

   public static void main(String argv[]) throws Exception {
       String url = "www.sun.com";
       System.setProperty("java.net.useSystemProxies", "true");

      SocketFactory factory = SSLSocketFactory.getDefault(); 

      Socket socket = factory.createSocket(url, HTTPS_PORT); 

      BufferedWriter out = new BufferedWriter(new 
            OutputStreamWriter(socket.getOutputStream()));
      BufferedReader in = new BufferedReader(
        new InputStreamReader(socket.getInputStream()));
      out.write("GET / HTTP/1.0\n\n");
      out.flush();

      String line;
      StringBuffer sb = new StringBuffer();
      while((line = in.readLine()) != null) {
         sb.append(line);
      }
      out.close();
      in.close();
      System.out.println(sb.toString());
   }
}

它挂起了大约一分钟的时间(我相信由于服务器端超时)并且失败并出现错误.挂断电话

Socket socket = factory.createSocket(url, HTTPS_PORT); 

错误是

Exception in thread "main" java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocksSocketImpl.readSocksReply(Unknown Source)
    at java.net.SocksSocketImpl.connect(Unknown Source)
    at java.net.Socket.connect(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.<init>(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketFactoryImpl.createSocket(Unknown Source)
    at com.sun.ex1.ReadHttpsURL1.main(ReadHttpsURL1.java:20)

这是第二个例子:

public class HttpsTest {

    public static void main(String[] args) throws MalformedURLException, IOException {
        System.setProperty("java.net.useSystemProxies", "true");

        URL url = new URL("https://www.sun.com");
        URLConnection con = url.openConnection();
        con.setAllowUserInteraction(true);
        InputStream is = new BufferedInputStream(con.getInputStream());
        for (int b = is.read(); b >= 0; b = is.read()) {
            System.out.write(b);
        }
    }
}

抛出这个例外:

Exception in thread "main" javax.net.ssl.SSLKeyException: RSA premaster secret error
    at com.sun.net.ssl.internal.ssl.RSAClientKeyExchange.<init>(Unknown Source)
    at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverHelloDone(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.startHandshake(Unknown Source)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(Unknown Source)
    at sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
    at HttpsTest.main(HttpsTest.java:16)
Caused by: java.security.NoSuchAlgorithmException: SunTlsRsaPremasterSecret KeyGenerator not available
    at javax.crypto.KeyGenerator.<init>(DashoA13*..)
    at javax.crypto.KeyGenerator.getInstance(DashoA13*..)
    at com.sun.net.ssl.internal.ssl.JsseJce.getKeyGenerator(Unknown Source)
    ... 14 more

我读过一些关于NoSuchAlgorithmException的内容.这似乎与sunjce_provider.jar有关
我尝试了不同的变种来在类路径中包含这个文件,甚至使应用程序依赖于这个jar(jar确实存在于classpath中)

HTTPS URL是实时URL.代理设置正在运行(否则会抛出另一个连接异常).
java版"1.6.0_23"

这些错误是否相关？
任何想法如何解决？
感谢帮助!

Answer 1

套接字问题是由代理引起的。如果我没有得到java.net.ConnectException：连接被拒绝：连接（如果根本没有配置代理）代理不应引起问题，我就得出错误的结论。在“访客网络”（无代理）中，应用程序似乎正在运行。事实证明，代理对每个协议都有不同的配置，并且我的公司政策不推荐使用原始套接字连接。