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                # `ServletConfig`接口 > 原文: [https://beginnersbook.com/2017/07/servletconfig-interface-with-example/](https://beginnersbook.com/2017/07/servletconfig-interface-with-example/) Servlet 容器在初始化期間為每個 Servlet 創建`ServletConfig`對象,以將信息傳遞給 Servlet。此對象可用于從部署描述符文件(`web.xml`)獲取配置信息,例如參數名稱和值。 ## `ServletConfig`接口的方法 `public String getInitParameter(String name)`:以`String`形式返回給定參數的值,如果`web.xml`中不存在給定參數,則返回`null`。 `public Enumeration getInitParameterNames()`:返回所有參數名稱的枚舉。 `public String getServletName()`:返回 servlet 實例的名稱。 `public ServletContext getServletContext()`:返回`ServletContext`的一個對象。 ## 例: 在這個例子中,我們將使用兩個方法`getInitParameter()`和`getInitParameterNames()`來獲取`web.xml`中的所有參數及其值。 `getInitParameterNames()`方法返回所有參數名稱的枚舉,并通過在調用`getInitParameter()`方法期間傳遞這些名稱,我們可以從`web.xml`獲取相應的參數值。 `DemoServlet.java` ```java import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.Enumeration; public class DemoServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter pwriter = response.getWriter(); ServletConfig sc=getServletConfig(); Enumeration<String> e=sc.getInitParameterNames(); String str; while(e.hasMoreElements()) { str=e.nextElement(); pwriter.println("<br>Param Name: "+str); pwriter.println(" value: "+sc.getInitParameter(str)); } } } ``` `web.xml` ```java <web-app> <display-name>BeginnersBookDemo</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> <servlet> <servlet-name>MyServlet</servlet-name> <servlet-class>DemoServlet</servlet-class> <init-param> <param-name>MyName</param-name> <param-value>Chaitanya</param-value> </init-param> <init-param> <param-name>MyWebsite</param-name> <param-value>Beginnersbook.com</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>MyServlet</servlet-name> <url-pattern>/scdemo</url-pattern> </servlet-mapping> </web-app> ``` **輸出:** ![Servlet Config output](https://img.kancloud.cn/e3/1d/e31d5e7ea06651a0ae43b4404ff96b4d_650x114.jpg)
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