String username = "foo";
String password = "bar";
String login = username + ":" + password;
String base64login = new String(Base64.encodeBase64(login.getBytes()));
Document document = Jsoup
.connect("http://example.com")
.header("Authorization", "Basic " + base64login)
.get();
原文：http://www.cnblogs.com/leonxiaosi/p/4648769.html