Spring - Spring集成web环境 -基本三层架构搭建案例
文章目录
- Spring集成web环境-基本三层架构搭建
-
- 新建项目（案例）
-
- 编写一些类和接口
- 导入需要依赖
- spring.xml和properties文件
- 添加servlet、jsp、tomcat依赖
- 模拟web层
-
- 编写servlet
- 成功测试运行
- Spring集成web环境-ContextLoderListener监听器的分析
-
- 监听器演示
-
- 编写类实现监听器
- 在web.xml配置监听器
- 重新编写servlet
- 成功测试运行
- 解耦spring.xml
-
- 撤除加载容器
- 编写web.xml
- 读取web.xml中全局参数
- 成功测试运行
- 解耦app对象1
-
- 创建编写类
- 编写Servlet
- 成功测试运行
- Spring提供获取应用上下文的工具
-
- 解耦app对象2
-
- 导入依赖
- 编写web.xml
- 编写servlet
- 成功测试运行
- 步骤分析
Spring集成web环境-基本三层架构搭建
新建项目（案例）
new project-maven-骨架-选择setting.xml路径
编写一些类和接口
导入需要依赖
<dependencies>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>5.1.32version>
dependency>
<dependency>
<groupId>c3p0groupId>
<artifactId>c3p0artifactId>
<version>0.9.1.2version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druidartifactId>
<version>1.1.10version>
dependency>
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.12version>
<scope>testscope>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-contextartifactId>
<version>5.0.5.RELEASEversion>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-testartifactId>
<version>5.0.5.RELEASEversion>
dependency>
dependencies>
spring.xml和properties文件
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="classpath:jdbc.properties">context:property-placeholder>
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver">property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/mybatis">property>
<property name="user" value="root">property>
<property name="password" value="$12345">property>
bean>
<bean id="userDao" class="com.taotao.dao.impl.UserDaoImpl">bean>
<bean id="userService" class="com.taotao.service.impl.UserServiceImpl">
<property name="userDao" ref="userDao"/>
bean>
beans>
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=12345
添加servlet、jsp、tomcat依赖
<dependency>
<groupId>javax.servletgroupId>
<artifactId>javax.servlet-apiartifactId>
<version>3.0.1version>
<scope>providedscope>
dependency>
<dependency>
<groupId>javax.servlet.jspgroupId>
<artifactId>javax.servlet.jsp-apiartifactId>
<version>2.2.1version>
<scope>providedscope>
dependency>
<build>
<plugins>
<plugin>
<groupId>org.apache.tomcat.mavengroupId>
<artifactId>tomcat7-maven-pluginartifactId>
<version>2.2version>
plugin>
plugins>
build>
模拟web层
编写servlet
webServlet = userServlet
package com.taotao.web;
import com.taotao.service.UserService;
import com.taotao.service.impl.UserServiceImpl;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* create by 刘鸿涛
* 2022/4/14 20:25
*/
@SuppressWarnings({"all"})
@WebServlet("/userServlet")
public class UserServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
UserServiceImpl userServiceImpl = app.getBean(UserServiceImpl.class);
userServiceImpl.save();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req, resp);
}
}
成功测试运行
Spring集成web环境-ContextLoderListener监听器的分析
监听器演示
编写类实现监听器
package com.taotao.listener;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
* create by 刘鸿涛
* 2022/4/14 20:55
*/
@SuppressWarnings({"all"})
public class ContextLoaderListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent servletContextEvent) {
//初始化Spring容器
ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
//将Spring的应用上下文对象存储到ServletContest域中
ServletContext servletContext = servletContextEvent.getServletContext();
servletContext.setAttribute("app",app);
}
public void contextDestroyed(ServletContextEvent servletContextEvent) {
}
}
在web.xml配置监听器
DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Applicationdisplay-name>
<listener>
<listener-class>com.taotao.listener.ContextLoaderListenerlistener-class>
listener>
web-app>
重新编写servlet
package com.taotao.web;
import com.taotao.service.UserService;
import com.taotao.service.impl.UserServiceImpl;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* create by 刘鸿涛
* 2022/4/14 20:25
*/
@SuppressWarnings({"all"})
@WebServlet("/userServlet")
public class UserServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
ServletContext servletContext = this.getServletContext();
//向上转型
ApplicationContext app = (ApplicationContext) servletContext.getAttribute("app");
UserServiceImpl userServiceImpl = app.getBean(UserServiceImpl.class);
userServiceImpl.save();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req, resp);
}
}
成功测试运行
解耦spring.xml
撤除加载容器
package com.taotao.listener;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
* create by 刘鸿涛
* 2022/4/14 20:55
*/
@SuppressWarnings({"all"})
public class ContextLoaderListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent servletContextEvent) {
//初始化Spring容器
ApplicationContext app = new ClassPathXmlApplicationContext("");
//将Spring的应用上下文对象存储到ServletContest域中
ServletContext servletContext = servletContextEvent.getServletContext();
servletContext.setAttribute("app",app);
}
public void contextDestroyed(ServletContextEvent servletContextEvent) {
}
}
编写web.xml
<context-param>
<param-name>contextConfigLocationparam-name>
<param-value>applicationContext.xmlparam-value>
context-param>
读取web.xml中全局参数
重新编写ContextLoaderListener.java
package com.taotao.listener;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
* create by 刘鸿涛
* 2022/4/14 20:55
*/
@SuppressWarnings({"all"})
public class ContextLoaderListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent servletContextEvent) {
ServletContext servletContext = servletContextEvent.getServletContext();
//读取web.xml中的全局参数
String contextConfigLocation = servletContext.getInitParameter("contextConfigLocation");
//初始化Spring容器
ApplicationContext app = new ClassPathXmlApplicationContext(contextConfigLocation);
//将Spring的应用上下文对象存储到ServletContest域中
servletContext.setAttribute("app",app);
}
public void contextDestroyed(ServletContextEvent servletContextEvent) {
}
}
成功测试运行
解耦app对象1
创建编写类
package com.taotao.listener;
import org.springframework.context.ApplicationContext;
import javax.servlet.ServletContext;
/**
* create by 刘鸿涛
* 2022/4/14 21:21
*/
@SuppressWarnings({"all"})
public class WebApplicationContextUtils {
public static ApplicationContext getWebApplicationContext(ServletContext servletContext){
return (ApplicationContext) servletContext.getAttribute("app");
}
}
编写Servlet
package com.taotao.web;
import com.taotao.listener.WebApplicationContextUtils;
import com.taotao.service.UserService;
import com.taotao.service.impl.UserServiceImpl;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* create by 刘鸿涛
* 2022/4/14 20:25
*/
@SuppressWarnings({"all"})
@WebServlet("/userServlet")
public class UserServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
ServletContext servletContext = this.getServletContext();
ApplicationContext app = WebApplicationContextUtils.getWebApplicationContext(servletContext);
UserServiceImpl userServiceImpl = app.getBean(UserServiceImpl.class);
userServiceImpl.save();
System.out.println("Spring容器创建完毕....");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req, resp);
}
}
成功测试运行
Spring提供获取应用上下文的工具
解耦app对象2
导入依赖
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-webartifactId>
<version>5.0.5.RELEASEversion>
dependency>
编写web.xml
重新配置监听器
<context-param>
<param-name>contextConfigLocationparam-name>
<param-value>classpath:applicationContext.xmlparam-value>
context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
listener>
编写servlet
主要导入类，不要冲突
package com.taotao.web;
import com.taotao.service.impl.UserServiceImpl;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* create by 刘鸿涛
* 2022/4/14 20:25
*/
@SuppressWarnings({"all"})
@WebServlet("/userServlet")
public class UserServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
ServletContext servletContext = this.getServletContext();
// ApplicationContext app = WebApplicationContextUtils.getWebApplicationContext(servletContext);
ApplicationContext app = WebApplicationContextUtils.getWebApplicationContext(servletContext);
UserServiceImpl userServiceImpl = app.getBean(UserServiceImpl.class);
userServiceImpl.save();
System.out.println("Spring容器创建完毕....");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req, resp);
}
}
成功测试运行
步骤分析
