java https tlsv1,如何在Java中使用TLSV1或SSLV3进行第一次握手（Client Hello）？

When I execute the following code, why is the first handshake SSLv2, not TLSv1 or SSLv3?

How to use TLSV1 or SSLV3 for first handshake in Java?

String host = "www.google.com";

String url = "/adsense/?sourceid=aso&subid=ZH_CN-ET-AS-ADSBY6&medium=link&hl=zh_CN";

SSLContext ctx = SSLContext.getInstance("TLS");

ctx.init(new KeyManager[0], new TrustManager[] {new DefaultTrustManager()}, new SecureRandom());

SSLContext.setDefault(ctx);

SSLSocketFactory factory = ctx.getSocketFactory();

Socket socket = factory.createSocket(host, 443);

BufferedWriter out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));

BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

out.write("GET " + url + " HTTP/1.0");

out.flush();

out.close();

in.close();

解决方案

For TLSv1:

Starting the client jvm with

-Dhttps.protocols="TLSv1"

or using

System.setProperty("https.protocols", "TLSv1");

solved the problem for me.