Hello Servlet
1.构建maven项目
2.导入依赖
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.3</version>
</dependency>
3.编写一个Servlet程序
1.编写一个普通类。
2.实现Servlet接口，这里继承Servlet的实现类HttpServlet。
3.重写doGet() 和doPost() 方法。
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
/**
* @author ai lin
* @create 2022-01-16-0:40
*/
public class HelloServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("text/html");
PrintWriter writer = resp.getWriter();
writer.print("<html>");
writer.print("<head>");
writer.print("<title>Hello word!</title>");
writer.print("</head>");
writer.print("<body>");
writer.print("<h1>hello word</h1>");
writer.print("</body>");
writer.print("</html>");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
super.doPost(req, resp);
}
}
4.在web.xml编写servlet 映射。
<!--注册servlet-->
<servlet>
<servlet-name>helloServlet</servlet-name>
<servlet-class>HelloServlet</servlet-class>
</servlet>
<!--一个servlet对应一个servlet—mapping ：映射-->
<servlet-mapping>
<servlet-name>helloServlet</servlet-name>
<!--访问路径-->
<url-pattern>/hello</url-pattern>
</servlet-mapping>
5. 配置tomcat
注意路径