标签：
ServletConfig对象
public abstract interface ServletConfig
A servlet configuration object used by a servlet container used to pass information to a servlet during initialization
Method Summary:
1、 java.lang.String getInitParameter(java.lang.String name) : Returns a String containing the value of the named initialization parameter,or null if the parameter does not exist.
2、 java.util.Enumeration getInitParameterNames() : Returns the names of the servlet‘s initialization parameters as an Enumeration of String objects,or an empty Enumeration if the servlet has no initialization parameters.
3、 ServletContext getServletContext() : Return a reference to the ServletContext in which the caller is executing
4、 java.lang.String getServletName() : Returns the name of this servlet instance.
ServletConfig ： 封装了Servlet配置信息，并且可以获取ServletContext对象
1.配置Servlet的初始化参数：只有当前Servlet可以获取这些初始化参数
<!-- 配置和映射Servlet -->
<servlet>
<!-- Servlet 注册的名称 -->
<servlet-name>HelloServlet</servlet-name>
<!-- Servlet 的全类名 -->
<servlet-class>com.servlet.demo.HelloServlet</servlet-class>
<!-- 配置Servlet的初始化参数 -->
<init-param>
<!-- 参数名 -->
<param-name>user</param-name>
<!-- 参数值 -->
<param-value>root</param-value>
</init-param>
<init-param>
<!-- 参数名 -->
<param-name>password</param-name>
<!-- 参数值 -->
<param-value>1230</param-value>
</init-param>
<!-- 可以指定Servlet被创建的时机 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<!-- 需要和某一个servlet节点的servlet-name子节点的文本节点一致 -->
<servlet-name>HelloServlet</servlet-name>
<!-- 映射具体的访问路径: / 代表当前WEB应用的根目录 -->
<url-pattern>/hello</url-pattern>
</servlet-mapping>
2.获取初始化参数
getInitParameter(String name) ： 获取指定参数名的初始化参数
getInitParameterNames() ： 获取参数名组成的Enumeration对象
public void init(ServletConfig config) throws ServletException { System.out.println("Servlet init method!"); String user = config.getInitParameter("user"); System.out.println("user = " + user); Enumeration<String> names = config.getInitParameterNames(); while(names.hasMoreElements()) { String name = names.nextElement(); String value = config.getInitParameter(name); System.out.println(name + " = " + value); } }
标签：
原文地址：http://www.cnblogs.com/xinhuaxuan/p/4596941.html
