一般在实际项目开发中，都是使用继承HttpServlet类的方式去实现Servlet程序 * 1、编写一个类去继承 HttpServlet 类 * 2、根据业务需要重写doGet或doPost方法 * 3、到web.xml中配置Servlet程序的访问地址
package demo01; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; /** * 一般在实际项目开发中，都是使用继承HttpServlet类的方式去实现Servlet程序 * * 1、编写一个类去继承 HttpServlet 类 * 2、根据业务需要重写doGet或doPost方法 * 3、到web.xml中配置Servlet程序的访问地址 */ public class Hello2 extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("doget方法"); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("dopost方法"); } }
web.xml配置：
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>Hello2</servlet-name> <servlet-class>demo01.Hello2</servlet-class> </servlet> <servlet-mapping> <servlet-name>Hello2</servlet-name> <url-pattern>/hello2</url-pattern> </servlet-mapping> </web-app>
也可以使用IDEA自动实现,可以减轻我们的代码量
以IDEA2019.3.3为例：
1、
2、
如果勾选，将会使用3.0以上注解配置
3、生成一个Hello3类和一个web.xml配置文件：
Hello3.java:
package demo01; 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 Hello3 extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } }
web.xml:
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <servlet> <servlet-name>Hello3</servlet-name> <servlet-class>demo01.Hello3</servlet-class> </servlet> </web-app>
