1.在eclipse中配置tomcat，参考上一边文章，建立的web项目tomcatWeb目录结构
2.添加Servlet处理类
3. 实现doGet()与doPost()方法：
<span style="font-size:18px;">public class HttpServletDemo extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 4230239235404655360L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException {
response.setContentType("text/html;charset=GB2312");
PrintWriter printWriter = response.getWriter();
// printWriter.print("hello, china");
String title = "HelloServlet";
String heading1 = "HelloServlet的doGet方法的输出：";
printWriter = response.getWriter();
printWriter.print("<HTML><HEAD><TITLE>" + title + "</TITLE>");
printWriter.print("</HEAD><BODY>");
printWriter.print(heading1);
printWriter.println("<h1><p>:您好</h1>");
printWriter.print("</body></HTML>");
printWriter.write("");
printWriter.flush();
printWriter.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException {
doGet(request, response);
}
}</span>4. 在web.xml中配置servlet
<span style="font-size:18px;"> <servlet>
<servlet-name>TomcatWeb</servlet-name>
<servlet-class>tomcat.servlet.HttpServletDemo</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>TomcatWeb</servlet-name>
<url-pattern>/servlet/HttpServletDemo</url-pattern>
</servlet-mapping></span>
方式1：右击项目--run as - run on server - 选择配置好的tomcat容器
方式2：
6. 在浏览器上输入：http://localhost:8080/TomcatWeb/servlet/HttpServletDemo，即可看到
