手动实现Spring整合Tomcat容器

朱雀 2022-04-11 03:40 262阅读 0赞

# 帮助类 #

/**
     * @program: Maven
     * @description: spring整合进tomcat
     * @author: hw
     * @create: 2018-12-04 15:18
     **/
    public class SpringWebUtil {
    
        private static final String SPRING_CONTEXT_KEY = "spring_context_key";
    
        /**
         * spring放入tomcat容器中
         *
         * @Description:已经建模好的spring的上下文
         * @Param: [context, servletContext]
         * @return: void
         * @Author: hw
         * @Date: 2018/12/4
         */
        public static void setApplicationContext(ApplicationContext context, ServletContext servletContext) {
            servletContext.setAttribute(SPRING_CONTEXT_KEY, context);
        }
    
        /**
         * @Description: 获取
         * @Param: [servletContext]
         * @return: org.springframework.context.ApplicationContext
         * @Author: hw
         * @Date: 2018/12/4
         */
        public static ApplicationContext getApplicationContext(ServletContext servletContext) {
            return (ApplicationContext) servletContext.getAttribute(SPRING_CONTEXT_KEY);
        }

# 监听类 #

/**
     * @program: Maven
     * @description: ..
     * @author: hw
     * @create: 2018-12-04 15:47
     **/
    public class SpringLoaderListener implements ServletContextListener {
        //默认配置名
        private String configLocation="xxx";
    
        /**
         * @Description: 启动执行
         * @Param: [servletContextEvent]
         * @return: void
         * @Author: hw
         * @Date: 2018/12/4
         */
        @Override
        public void contextInitialized(ServletContextEvent servletContextEvent) {
            //获取tomcat上下文
            ServletContext servletcont = servletContextEvent.getServletContext();
    
            //默认名
            String spingXml="spring-context.xml";
            String Path = servletcont.getInitParameter(configLocation);
            //如果没配置则用默认的
            if(!(null==Path||"".equals(Path))){
                spingXml=Path;
            }
            System.out.println(spingXml);
            //建模
            ApplicationContext context = new ClassPathXmlApplicationContext("spring-context.xml");
            //放入tomcat
            SpringWebUtil.setApplicationContext(context, servletcont);
        }
    
        /**
         * @Description: 关闭执行
         * @Param: [servletContextEvent]
         * @return: void
         * @Author: hw
         * @Date: 2018/12/4
         */
        @Override
        public void contextDestroyed(ServletContextEvent servletContextEvent) {
    
        }

# web.xml #

<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">
        <display-name>Archetype Created Web Application</display-name>
        <listener>
            <listener-class>com.hw.one.util.SpringLoaderListener</listener-class>
        </listener>
        
        <context-param>
            <param-name>xxx</param-name>
            <param-value>spring-context.xml</param-value>
        </context-param>
    
        <servlet>
            <servlet-name>UserServlet</servlet-name>
            <servlet-class>com.hw.one.action.UserServlet</servlet-class>
        </servlet>
    
        <servlet-mapping>
            <servlet-name>UserServlet</servlet-name>
            <url-pattern>/userServlet</url-pattern>
        </servlet-mapping>
    </web-app>

# 测试类 #

public class UserServlet extends HttpServlet {
    
        @Override
        protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            System.out.println("xxx");
            //获取spring的上下文
            ApplicationContext applicationContext = SpringWebUtil.getApplicationContext(req.getServletContext());
            StudentAction studentAction = (StudentAction) applicationContext.getBean("studentAction");
            System.out.println(studentAction.toString());
        }
        
    }

#  Spring的配置文件 #

<bean class="com.hw.one.action.StudentAction" id="studentAction">
            
            <property name="sid" value="123"></property>
            <property name="sname" value="盖伦"></property>
            
            <property name="list">
            <list>
            <value>吃</value>
            <value>喝</value>
            <value>玩</value>
            <value>乐</value>
            </list>
            </property>
    
            
            <constructor-arg name="sid" value="123"></constructor-arg>
            <constructor-arg name="sname" value="盖伦"></constructor-arg>
            
            
            
            
            
            
            
            
        </bean>