web.xml init-param中配置初始化參數
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>project4</display-name>
<servlet>
<servlet-name>servlet1</servlet-name>
<servlet-class>com.tanlan.javaees1.Servlet1</servlet-class>
<init-param>
<param-name>name1</param-name>
<param-value>value1</param-value>
</init-param>
<init-param>
<param-name>name2</param-name>
<param-value>value2</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>servlet1</servlet-name>
<url-pattern>/servlet1</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>讀取：
init方法中的參數
@Override
String value=config.getInitParameter("name1");
//System.out.println(value);
Enumeration<String> names=config.getInitParameterNames();
while(names.hasMoreElements()){
String name=names.nextElement();
System.out.println(name+","+config.getInitParameter(name));
}
}通過GenericServlet的getServletConfig方法
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
ServletConfig config=getServletConfig();
String value=config.getInitParameter("name1");
System.out.println(value);
Enumeration<String> names=config.getInitParameterNames();
while(names.hasMoreElements()){
String name=names.nextElement();
System.out.println(name+","+config.getInitParameter(name));
}
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
