[Servlet]Eclipse中建立web项目并使用servlet
1.建立web项目
前提是在Eclipse中配置好tomcat,Eclipse中配置tomcat请参考Eclipse中tomcat的配置
1)创建dynamic web project,只需要命名为web01_exec,其余默认设置即可;
2)next-next-勾选generate web.xml deployment description,该选项会在目录下生成一个默认的xml文件;
3)在java resource的src下建立命名为web的package,创建名为DateServlet的类;
4)DateServlet类继承自HttpServlet,重载HttpServlet的service方法;
1 package web; 2 import javax.servlet.ServletException; 3 import javax.servlet.http.HttpServlet; 4 import javax.servlet.http.HttpServletRequest; 5 import javax.servlet.http.HttpServletResponse; 6 7 import java.util.Date; 8 import java.io.IOException; 9 import java.io.PrintWriter; 10 public class DateServlet extends HttpServlet { 11 public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException { 12 Date date=new Date(); 13 response.setContentType("text/html"); 14 PrintWriter out=response.getWriter(); 15 out.println("now:"+date); 16 out.close(); 17 } 18 }
5)修改web.xml的配置,绿色部分为需要自己添加的<servlet><servlet-mapping>,其中servlet-name为servlet的命名,对应写的类,<servlet>和<servlet-mapping>成对出现,定义访问的路径;
1 <?xml version="1.0" encoding="UTF-8"?> 2 <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"> 3 <display-name>web01_exec</display-name> 4 <welcome-file-list> 5 <welcome-file>index.html</welcome-file> 6 <welcome-file>index.htm</welcome-file> 7 <welcome-file>index.jsp</welcome-file> 8 <welcome-file>default.html</welcome-file> 9 <welcome-file>default.htm</welcome-file> 10 <welcome-file>default.jsp</welcome-file> 11 </welcome-file-list> 12 <servlet> 13 <servlet-name>dateServlet</servlet-name> 14 <servlet-class>web.DateServlet</servlet-class> 15 </servlet> 16 <servlet-mapping> 17 <servlet-name>dateServlet</servlet-name> 18 <url-pattern>/date</url-pattern> 19 </servlet-mapping> 20 </web-app>
2.将项目web01_exec加载到tomcat server,(可以直接把项目拖动到tomcat的图标上),启动;
3.localhost:8080/web01_exec/date访问,可以显示当前日期。