JDK(Java Developer Kit, Java开发工具包)是Sun公司提供的Java开发工具。开发JSP必须使用JDK工具包，它包含Java编译器、解释器和虚拟机(JVM)，为JSP页面文件、Servlet程序提供编译和运行环境。JSP引擎使用JDK提供的编译器，将Servlet源代码文件编译为字节码文件。Servlet引擎使用JDK提供的虚拟机(JVM)运行servlet字节码文件。-JDK (Java Developer Kit, Java Development Kit) is Sun' s Java development tools provided. JSP must use the JDK development kit, which contains the Java compiler, interpreter and virtual machine (JVM), the page file for the JSP, Servlet program provides compiler and runtime environment. JSP engine uses the JDK provides a compiler, the Servlet source code file is compiled to bytecode files. Servlet engine uses JDK provides a virtual machine (JVM) to run servlet byte code files.