message

ObjectMessage objects depend on Java serialization of marshal/unmarshal object payload. This process is generally considered unsafe as malicious payload can exploit the host system. That's why starting with versions 5.12.2 and 5.13.0 , ActiveMQ enforces users to explicitly whitelist packages that can be exchanged using ObjectMessages. If you need to exchange object messages, you need to add packages your applications are using. You can do that with by using org.apache.activemq.SERIALIZABLE_PACKAGES system property of the broker. You can add this system property to ACTIVEMQ_OPTS variable in $

今天下午，做出了一个链接数据库的登陆判断跳转程序。 package dao; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import entry.user; import util.DBUtil; public class userDao { // public static boolean id(String id,String pwd) { boolean f = false; String sql = "select * from denglu where id = '" + id + "' and password = '"+pwd+"'"; // Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); if (rs.next()) { f = true; } } catch (SQLException e) { e.printStackTrace(); }