Spring第十一篇【Spring集合Web环境】

Spring集合Web环境

<?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>org.example</groupId>
    <artifactId>spring_web</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.5</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.2.8.RELEASE</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.21</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.3.3</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.2.8.RELEASE</version>
        </dependency>
    </dependencies>
</project>

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

<!--全局化初始参数-->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
</context-param>

<!--配置监听器-->
<listener>
    <listener-class>com.example.demo.ContextLoaderListener</listener-class>
</listener>

<servlet>
    <servlet-name>userServlet</servlet-name>
    <servlet-class>com.example.demo.web.UserServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>userServlet</servlet-name>
    <url-pattern>/userServlet</url-pattern>
</servlet-mapping>
</web-app>

package com.example.demo.web;

import com.example.demo.service.UserService;
import com.example.demo.service.impl.UserServiceImpl;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class UserServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
        WebApplicationContext webApplicationContext = WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());
        UserService bean = webApplicationContext.getBean(UserServiceImpl.class);
        bean.save();
    }
}

手动实现

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

<context-param>
    <param-name>myContextConfigLocation</param-name>
    <param-value>applicationContext.xml</param-value>
</context-param>

<listener>
    <listener-class>com.example.demo.MyContextLoaderListener</listener-class>
</listener>

<servlet>
    <servlet-name>userServlet</servlet-name>
    <servlet-class>com.example.demo.web.UserServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>userServlet</servlet-name>
    <url-pattern>/userServlet</url-pattern>
</servlet-mapping>
</web-app>

package com.example.demo;

import org.springframework.context.ApplicationContext;

import javax.servlet.ServletContext;

public class MyWebApplicationContextUtils {

    public static ApplicationContext getWebApplicationContext(ServletContext servletContext) {
        ApplicationContext app = (ApplicationContext) servletContext.getAttribute("app");
        return app;
    }
}

package com.example.demo;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class MyContextLoaderListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        ServletContext servletContext = sce.getServletContext();
        String myContextConfigLocation = servletContext.getInitParameter("myContextConfigLocation");
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext(myContextConfigLocation);
        servletContext.setAttribute("app",applicationContext);
    }
}