一般在实际项目开发中,都是使用继承HttpServlet类的形式去实现Servlet程序
步骤:
- 编写一个类去继承HttpServlet类
- 根据业务需要重写doGet或doPost方法
- 到web.xml中的配置Servlet程序的访问地址
HelloServlet2:
package com.servlet1;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class HelloServlet2 extends HttpServlet {
/**
* doGet()在get请求的时候调用
*/
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("HelloServlet2的doGet方法");
}
/**
* doPost()在post请求的时候调用
*/
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("HelloServlet2的doPost方法");
}
}
web.xml配置文件添加:
<servlet>
<servlet-name>HelloServlet2</servlet-name>
<servlet-class>com.servlet1.HelloServlet2</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet2</servlet-name>
<url-pattern>/hello2</url-pattern>
</servlet-mapping>