2013年5月

Android 2.3有个bug，需要重新改造SSLSocketFactory，把socket中的impl对象实例中注入带host信息的InetAddress及port。样例代码如下：

@Override
public Socket createSocket(Socket socket, String host, int port,
        boolean autoClose)throws IOException, UnknownHostException {
    Socket sk = xx.getSocketFactory().createSocket(socket, host, port, false);
    //特殊解决方案，解决android 2.3 SSL不能重用session问题
    try {
        Field implFiled = Socket.class.getDeclaredField("impl");
        implFiled.setAccessible(true);
        SocketImpl impl = (SocketImpl) implFiled.get(sk);

        Field addFiled = SocketImpl.class.getDeclaredField("address");
        addFiled.setAccessible(true);
        addFiled.set(impl, InetAddress.getByName(host));

        Field portFiled = SocketImpl.class.getDeclaredField("port");
        portFiled.setAccessible(true);
        portFiled.set(impl, port);

    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }
    return sk;
}

今天看到一个不规范的用法：finally中有return，例子如下：

    public static void main(String[] args) {
        System.out.print(a());
    }

    public static int a() {
        try {
            return 10;
        } catch (Throwable t) {
            return 11;
        } finally {
            return 12;
        }
    }

执行结果是12，说明是以最终的finally返回为准的。

当Oracle出现IO瓶颈时，用下面的SQL可以查当前执行的SQL

SELECT osuser, username, sql_text
  from v$session a, v$sqltext b
  where a.sql_address =b.address
  order by address, piece;

顺便附上查到的完整资料：

- 阅读剩余部分 -