第一个Servlet程序

程序员文章站 2024-02-22 10:13:22

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2019独角兽企业重金招聘Python工程师标准>>> 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>