Spring集成Web环境
【摘要】
Spring整合Web开发需要导入的坐标
<properties>
<project.build.sourceEncoding>UTF-8</project...
Spring整合Web开发需要导入的坐标
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
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<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<release>11</release>
</configuration>
</plugin>
</plugins>
</build>
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<dependencies>
<!-- 下面是web开发需要的依赖-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<!-- 下面是spring依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.2.4.RELEASE</version>
</dependency>
<!-- 下面两个是spring整和Web需要的坐标-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>Maven_Repository.javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.1</version>
<scope>provided</scope>
</dependency>
<!-- 下面是上下文应用整和的坐标-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>Maven_Repository.com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.3.158</version>
</dependency>
</dependencies>
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① 配置ContextLoaderListener监听器
② 使用WebApplicationContextUtils获得应用上下文
获取ApplicationContext对象是从servletContext域中获取的，还有就是使用WebApplicationContextUtils获取app。 可以直接从Spring获取app对象，省去了自己创建。还有就是以后要使用到多次app对象，所以就是省去了new出多了app对象。
dao层代码
package com.itheima.dao.impl;
import com.itheima.dao.UserDao;
public class UserDaoImpl implements UserDao {
public void save() {
System.out.println("save is running");
}
}
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service层代码
package com.itheima.service.impl;
import com.itheima.dao.UserDao;
import com.itheima.service.UserService;
public class UserServiceImpl implements UserService {
private UserDao userDao;
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
public void save() {
userDao.save();
}
}
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web层
package com.itheima.web;
import com.itheima.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.web.context.WebApplicationContext;
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;
@WebServlet("/servlet")
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();
// ApplicationContext app = (ApplicationContext) servletContext.getAttribute("app");
// ApplicationContext app = WebApplicationContextUtils.getWebApplicationContext(servletContext);
ApplicationContext app = WebApplicationContextUtils.getWebApplicationContext(servletContext);
UserService userService = (UserService) app.getBean("userService");
userService.save();
}
}
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applicationContext.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="userDao" class="com.itheima.dao.impl.UserDaoImpl"></bean>
<bean id="userService" class="com.itheima.service.impl.UserServiceImpl">
<property name="userDao" ref="userDao"></property>
</bean>
</beans>
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web.xml
<?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">
<!--全局初始化参数-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
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问题：
在配置maven时候，project下面有红色波浪线的话，可能是复制的坐标，需要重写写一遍，还有就是是maven可能是3.6.3版本，idea和maven可能会出现冲突，所以要降低maven版本，改为3.6.1版本即可。
在部署tomcat的时候，可能回出现监听器的问题，如果是tomcat10，就需要降低tomcat版本，如果是tomcat8.5.5及其一下的版本，就需要做一下操作。
就会出现lib包，再重新部署一下项目就可以了。
文章来源: blog.csdn.net，作者：花花叔叔，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/qq_52077949/article/details/122830919
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