Servlet 配置对象 ServletConfig Java EE 为取得 Servlet 的配置信息，提供一个 Servlet 配置对象 API。 该对象在 Servlet 初始化阶段由 Web 容器实例化，并将当前 Servlet 的配置数据写入到此对象，供 Servlet 读取使用。 ## 配置对象的类型和取得 配置对象类型 java.servlet.ServletConfig 是一个接口，具体实现类由容器厂商实现。 是一个接口，具体实现类由容器厂商实现。 ServletConfig 对象在 Servlet 的 init 方法中取得，由 Web 容器以参数方式注入到 Servlet: private ServletConfig config = null; public void init(ServletConfig config) throws ServletException { super.init(config); config; } 1. 要取得 ServletConfig 对象需要重写 init 方法，并传递 ServletConfig 参数。然后在 doGet 和 doPost 方法中即可以使用 config 对象。 2. 与 ServletContext 和 HttpSession 对象不同，Web 容器为每个 Servlet 实例创建一个 ServletConfig 对象，不同 Servlet 之间无法共享此对象。

..... 255 20.3 Servlet 配置对象 ..... 255 20.3.1 Servlet 配置对象 ServletConfig ..... 255 20.3.2 配置对象的类型和取得 ..... 255 20.3.3 ServletConfig 功能和方法 ..... 256 20.4 转发和重定向 ..... 257 20.4.1 Web 跳转方式 ... 方法完成初始化功能，一般将耗时的连接数据库和打开外部资源文件的操作放在 init 方法中。 init 方法在 Web 容器创建 Servlet 对象后立即执行，且只执行一次。 public void init(ServletConfig config) throws ServletException { super.init(config); // 这里放置初始化工作代码. } 在 init 方法中使用 900 ### 20.3 Servlet 配置对象 #### 20.3.1 Servlet 配置对象 ServletConfig - Java EE 为取得 Servlet 的配置信息，提供一个 Servlet 配置对象 API。 - 该对象在 Servlet 初始化阶段由 Web 容器实例化，并将当前 Servlet

overridden "toString()" implementation * FreeMarkerView exposes a ServletConfig object to FreeMarker, for use with ServletConfig-accessing JSP tags * fixed AbstractXsltView to correctly apply a specified ServletConfigAware interface, for getting access to a Framework/DispatcherServlet's ServletConfig object ServletConfig by default (can be turned off) * introduced Handler interface as alternative to Controller

overridden "toString()" implementation * FreeMarkerView exposes a ServletConfig object to FreeMarker, for use with ServletConfig-accessing JSP tags * fixed AbstractXsltView to correctly apply a specified access to a Framework/DispatcherServlet's ServletConfig object * SimpleServletPostProcessor configures Servlets with DispatcherServlet's ServletConfig by default (can be turned off) * introduced

overridden "toString()" implementation * FreeMarkerView exposes a ServletConfig object to FreeMarker, for use with ServletConfig-accessing JSP tags * fixed AbstractXsltView to correctly apply a specified access to a Framework/DispatcherServlet's ServletConfig object * SimpleServletPostProcessor configures Servlets with DispatcherServlet's ServletConfig by default (can be turned off) * introduced

overridden "toString()" implementation * FreeMarkerView exposes a ServletConfig object to FreeMarker, for use with ServletConfig-accessing JSP tags * fixed AbstractXsltView to correctly apply a specified access to a Framework/DispatcherServlet's ServletConfig object * SimpleServletPostProcessor configures Servlets with DispatcherServlet's ServletConfig by default (can be turned off) $ ^{*} $

overridden "toString()" implementation * FreeMarkerView exposes a ServletConfig object to FreeMarker, for use with ServletConfig-accessing JSP tags * fixed AbstractXsltView to correctly apply a specified access to a Framework/DispatcherServer's ServletConfig object * SimpleServletPostProcessor configures Servlets with DispatcherServlet's ServletConfig by default (can be turned off) * introduced

overridden "toString()" implementation * FreeMarkerView exposes a ServletConfig object to FreeMarker, for use with ServletConfig-accessing JSP tags * fixed AbstractXsltView to correctly apply a specified access to a Framework/DispatcherServlet's ServletConfig object * SimpleServletPostProcessor configures Servlets with DispatcherServlet's ServletConfig by default (can be turned off)

overridden "toString()" implementation * FreeMarkerView exposes a ServletConfig object to FreeMarker, for use with ServletConfig-accessing JSP tags * fixed AbstractXsltView to correctly apply a specified access to a Framework/DispatcherServlet's ServletConfig object * SimpleServletPostProcessor configures Servlet with DispatcherServlet's ServletConfig by default (can be turned off) * introduced

"toString()" implementation * FreeMarkerView exposes a ServletConfig object to FreeMarker, for use with ServletConfig-accessing JSP tags * fixed AbstractXsltView to correctly apply a specified access to a Framework/DispatcherServlet's ServletConfig object * SimpleServletPostProcessor configures Servlets with DispatcherServlet's ServletConfig by default (can be turned off) * introduced