标签：ack text iter details xsd vax class string val
转自：http://blog.csdn.net/qq924862077/article/details/52883973?locationNum=2&fps=1
在以前的servlet中我们初始化一些参数都是配置在web.xml中的，自从servlet3.0之后给我们提供了注解@WebServlet和@WebInitParam，@WebServlet是用来配置servlet的属性的，@WebInitParam是用来配置一些初始化属性的。
@WebServlet和@WebInitParam使用如下：
package roseindia.net; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.annotation.WebInitParam; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet( name = "WebInitParamExample", urlPatterns = {"/hello"} ,initParams = { @WebInitParam(name= "Site :", value="http://roseindia.net"), @WebInitParam(name= "Rose", value= "India"), } ) public class WebInitParamExample extends HttpServlet{ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<h2>Init Param Servlet Example</h2>"); ServletConfig config= getServletConfig(); String pValue= config.getInitParameter("Site :"); out.println("Param Value : "+pValue); String pValue1= config.getInitParameter("Rose"); out.println("<br>Param Value : "+pValue1); out.close(); } }
如果在web.xml中配置则如下：
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>servletAnnotationExample</display-name>
<servlet>
<servlet-name>WebInitParamExample</servlet-name>
<servlet-class>roseindia.net.WebInitParamExample</servlet-class>
<init-param>
<param-name>Site :</param-name>
<param-value>http://roseindia.net</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>WebInitParamExample</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
</web-app>
servlet3.0注解@WebInitParam和@WebServlet
标签：ack text iter details xsd vax class string val
原文地址：http://www.cnblogs.com/stAr-1/p/7424270.html
