Spring 在Web中的应用

　　在web项目开发中，不会直接实例化ApplicationContext对象，如果想用到ApplicationContext,一般的步骤：

配置一个监听器ContextLoaderListener，这个监听器是ServletContext的监听器

<listener>

        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

<context-param>

    <param-name>contextConfigLocation</param-name>

    <param-value>classpath:applicationContext.xml</param-value>

</context-param>

可选的，设定你的xml配置文件的路径
1. 如果文件在web-info 下面，并且名字为applicationContext.xml,就不需要再额外配置
2. 如果文件不符合上面的规则，就需要配置context-param、
利用一个WebApplicationContextUtils来读取第二部创建的ApplicationContext对象

导相关依赖包

 <?xml version="1.0" encoding="UTF-8"?>

 <project xmlns="http://maven.apache.org/POM/4.0.0"

          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

     <modelVersion>4.0.0</modelVersion>

     <groupId>com</groupId>

     <artifactId>spring-demo</artifactId>

     <version>1.0-SNAPSHOT</version>

     <packaging>war</packaging>

     <dependencies>

         <dependency>

             <groupId>org.springframework</groupId>

             <artifactId>spring-core</artifactId>

             <version>5.0.2.RELEASE</version>

         </dependency>

         <dependency>

             <groupId>org.springframework</groupId>

             <artifactId>spring-context</artifactId>

             <version>5.0.2.RELEASE</version>

         </dependency>

         <dependency>

             <groupId>org.springframework</groupId>

             <artifactId>spring-jdbc</artifactId>

             <version>5.0.2.RELEASE</version>

         </dependency>

         <dependency>

             <groupId>com.microsoft.sqlserver</groupId>

             <artifactId>mssql-jdbc</artifactId>

             <version>6.2.1.jre8</version>

         </dependency>

         <!-- hibernate -->

         <dependency>

             <groupId>org.hibernate</groupId>

             <artifactId>hibernate-core</artifactId>

             <version>5.2.10.Final</version>

         </dependency>

         <!-- 下面的依赖里面至少有LocalSessionFactoryBean -->

         <dependency>

             <groupId>org.springframework</groupId>

             <artifactId>spring-orm</artifactId>

             <version>5.0.2.RELEASE</version>

         </dependency>

         <dependency>

             <groupId>org.springframework</groupId>

             <artifactId>spring-beans</artifactId>

             <version>5.0.2.RELEASE</version>

         </dependency>

         <!--Web依赖-->

         <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->

         <dependency>

             <groupId>javax.servlet</groupId>

             <artifactId>javax.servlet-api</artifactId>

             <version>3.1.0</version>

             <scope>provided</scope>

         </dependency>

         <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->

         <dependency>

             <groupId>org.springframework</groupId>

             <artifactId>spring-web</artifactId>

             <version>5.0.1.RELEASE</version>

         </dependency>

     </dependencies>

     <build>

         <plugins>

             <plugin>

                 <artifactId>maven-war-plugin</artifactId>

                 <version>2.2</version>

                 <configuration>

                     <warSourceDirectory>web</warSourceDirectory>

                 </configuration>

             </plugin>

         </plugins>

     </build>

 </project>

　　配置web.xml文件

     <listener>

         <!--配置一个监听器ContextLoaderListener，这个监听器是ServletContext的监听器-->

         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

     </listener>

     <context-param>

         <!--spring的配置文件路径-->

         <param-name>contextConfigLocation</param-name>

         <param-value>classpath:Springweb.xml</param-value>

     </context-param>

　　配置Spring的依赖注入：SpringWeb.xml

 <?xml version="1.0" encoding="UTF-8"?>

 <beans xmlns="http://www.springframework.org/schema/beans"

        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

     <bean id="dao" class="web.UserDaoImpl"></bean>

     <bean id="service" class="web.Service">

         <property name="userDao" ref="dao"></property>

     </bean>

 </beans>

　　dao接口

 public interface UserDao {

     void add();

 }

　　dao实现

 public class UserDaoImpl implements UserDao

 {

     public void add() {

         System.out.println("aaaaaaaa");

     }

 }

　　service

 public class Service {

     private UserDao userDao;

     public UserDao getUserDao() {

         return userDao;

     }

     public void setUserDao(UserDao userDao) {

         this.userDao = userDao;

     }

     public void insert(){

         userDao.add();

     }

 }

　　servlet

 @WebServlet("/fist")

 public class Servlet extends HttpServlet {

     @Override

     protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        /* ApplicationContext applicationContext = new ClassPathXmlApplicationContext("Springweb.xml");

         Service service = applicationContext.getBean("service",Service.class);

         service.insert();*/

         ApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(req.getServletContext());

         Service service = applicationContext.getBean("service",Service.class);

         service.insert();

     }

 }

巴特西

Spring 在Web中的应用

Spring 在Web中的应用

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