Spring集成Web环境的实例详解
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2021-11-23 10:46:13
spring整合web开发需要导入的坐标 utf-8
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><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><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-->
<groupid>org.springframework</groupid>
<artifactid>spring-context</artifactid>
<version>4.2.4.release</version>
<!-- 下面两个是spring整和web需要的坐标-->
<artifactid>javax.servlet-api</artifactid>
<scope>provided</scope>
<groupid>maven_repository.javax.servlet.jsp</groupid>
<artifactid>javax.servlet.jsp-api</artifactid>
<version>2.3.1</version>
<!-- 下面是上下文应用整和的坐标-->
<artifactid>spring-web</artifactid>
<version>5.0.5.release</version>
<groupid>maven_repository.com.h2database</groupid>
<artifactid>h2</artifactid>
<version>1.3.158</version>
</dependencies>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");
}
}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();
}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();
}
}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>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>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。
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