The Java Tutorials have been written for JDK 8.Java教程是为JDK 8编写的。Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.本页中描述的示例和实践没有利用后续版本中引入的改进，并且可能使用不再可用的技术。See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.有关Java SE 9及其后续版本中更新的语言特性的摘要，请参阅Java语言更改。
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.有关所有JDK版本的新功能、增强功能以及已删除或不推荐的选项的信息，请参阅JDK发行说明。
In LDAP v3, a Control is a message that enhances the existing LDAP operation by associating it with more information useful to the server or the client. A control can be either a request control or a response control. A request control is sent from the client to the server along with an LDAP request. A response control is sent from the server to the client along with an LDAP response. Either is represented by the interface javax.naming.ldap.Control.
See the controls lesson in the JNDI Tutorial if you haven't programmed using controls before.
In this lesson we will discuss the standard LDAP controls that are added to JDK 5.0. The necessary LDAP controls are already supported in the LDAP Booster Pack extension package available for the JNDI/LDAP service provider under com.sun.jndi.ldap.ctl package. The LDAP controls that are standardized by IETF are now made available in the javax.naming.ldap package of JDK through the following classes.