编写Servlet
@WebServlet(name = "MyServlet", urlPatterns = { "/my"})
public class MyServlet implements Servlet {
private transient ServletConfig servletConfig;
public void init(ServletConfig config) {
this.servletConfig = config;
}
public ServletConfig getServletConfig() {
return servletConfig;
}
public void service(ServletRequest req, ServletResponse res) throws IOException {
String name = getServletInfo();
res.setContentType("text/html");
res.setCharacterEncoding("UTF-8");
PrintWriter pw = res.getWriter();
pw.print("<html><head></head>" + "<body>欢迎来到" + name + "</body>" + "</html>");
}
public String getServletInfo() {
return "My Servlet";
}
public void destroy() {
}
}
部署描述符(src/main/webapp/WEB-INF/web.xml)
部署描述符总是命名为web.xml,并放在WEB-INF目录下
<?xml version="1.0"?>
<web-app
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>app01a.MyServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>/my</url-pattern>
</servlet-mapping>
</web-app>
把Servlet程序部署到Tomcat中
部署方式有两种:
- 将应用程序的目录复制到Tomcat安装目录的webapps目录中,适合开发部署
- 将应用程序打包成war包,同样放到webapps目录中,适合生产部署
开发部署
pom.xml配置如下
执行mvn命令
mvn clean compile war:exploded
生成如下目录文件
将目录添加到Tomcat的webapps中
启动Tomcat后访问
my:是servlet的映射url
生产部署
pom.xml
执行mvn命令
mvn clean package
或
mvn compile war:war