servlet例子

1.打开eclipse，File->new->Java->Tomat Project.
Project name:Tomcat2
2.在WEB-INF/src目录上右键创建一个新类.
Package:test
Name:Servlettest
Superclass:选择Browse,输入Http，这时会列出所有http开头的类，选择HttpServlet-javax.servlet.http
3.打开Servlettest.java后，右键选source->Override/Implement Methods->doGet
这样我们就重载/实现了父类的doget方法.
将:
protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
  // TODO Auto-generated method stub
  super.doGet(arg0, arg1);
}
修改：
protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
  // TODO Auto-generated method stub
   //PrintWriter类：向文本输出流打印对象的格式化表示形式
  PrintWriter out=arg1.getWriter();  //PrintWriter因为是属于java.io包,所以还 要import java.io.PrintWriter;
               
  out.println("hello Servlet");
}
4.在WEB-INF目录上右键创建一个web.xml,这里利用Myeclipse插件带的xml项目来创建.
MyEclipse->XML->XML(Advanced Templates)
fileName:web.xml
Template to use:XML template for a web.xml file
打开web.xml这时已经为建立了模板，经过修改：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
  <servlet-name>Test</servlet-name>
  <servlet-class>test.Servlettest</servlet-class>
</servlet>

<servlet-mapping>
  <servlet-name>Test</servlet-name>
  <url-pattern>/test/*</url-pattern>
</servlet-mapping>

</web-app>
5.输入http://localhost/tomcat2/test/,应该就能看到"hello servlet"了.