第一个Servlet程序

Servlet 基础

• 环境
  IDEA JDK1.8 Maven servlet-api:2.5 tomcat:9.0.0.M9

• 构建

  • IDEA上新建一个Maven项目
    

  • 添加pom依赖

    <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>servlet-api</artifactId>
          <version>2.5</version>
          <scope>provided</scope>
      </dependency>

  • 编写继承HttpServlet的实现

    @Override
     public void init() throws ServletException {
         System.out.println("初始化");
     }
    
     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
         resp.setContentType("text/html");
         PrintWriter out = resp.getWriter();
         out.print("<h1>hello,World</h1>");
     }
    
     @Override
     public void destroy() {
         System.out.println("销毁");
     }

  • 配置web.xml

    <web-app>
      <servlet>
          <servlet-name>hello_world</servlet-name>
          <servlet-class>com.teemo.blog.MyServlet</servlet-class>
      </servlet>
      <servlet-mapping>
          <servlet-name>hello_world</servlet-name>
          <url-pattern>/hello</url-pattern>
      </servlet-mapping>
    </web-app>

  • 项目结构图
    

• 运行

  • IDEA配置Tomcat
    

  • 运行
    

• 最终结果