spring-01-快速上手

快速上手

配置pom.xml文件

<?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.spring</groupId>
    <artifactId>spring</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <!--spring框架导入-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.17.RELEASE</version>
        </dependency>
        <!-- 单元测试 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

配置完成则导入spring依赖的jar包

例如有一个Bean对象
配置这个Message.java文件

package com.spring;
public class MessageService {
    private String message;
    MessageService(){
        System.out.println("test");
    }
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
}

在spring-config.xml配置

<?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">
    <!--id:用于从spring容器获得实例时使用-->
    <!--class:需要创建实例化的全限定名-->
    <!--property:类中的成员-->
    <!--scope是bean的作用域-->
    <!--scope属性有singleton单例模式,prototype多例模式-->
    <!--默认是单例模式-->
    <bean id="messageService" class="com.spring.MessageService" scope="singleton">
        <!--name:成员的名称-->
        <!--value:对应属性的值-->
        <property name="message" value="hello spring"/>
    </bean>
</beans>

Junit

配置test.java文件

package com.spring;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MessageServiceTest {
    @Test
    public void setMessage() {
//        读取全局配置文件
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext(
                "spring-config.xml"
        );
//        获取Java对象
        MessageService messageService = (MessageService) applicationContext.getBean("messageService");
        MessageService messageService1 = applicationContext.getBean(MessageService.class);
        String message = messageService.getMessage();
        System.out.println(message);
    }
}

控制台输出为

D:\Java\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 -javaagent:D:\IntelliJ\lib\idea_rt.jar=4895:D:\IntelliJ\bin -Dfile.encoding=UTF-8 -classpath D:\IntelliJ\lib\idea_rt.jar;D:\IntelliJ\plugins\junit\lib\junit-rt.jar;D:\IntelliJ\plugins\junit\lib\junit5-rt.jar;D:\ideaProjects\spring\target\test-classes;D:\ideaProjects\spring\target\classes;C:\Users\Administrator\.m2\repository\org\springframework\spring-context\4.3.17.RELEASE\spring-context-4.3.17.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-aop\4.3.17.RELEASE\spring-aop-4.3.17.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-beans\4.3.17.RELEASE\spring-beans-4.3.17.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-core\4.3.17.RELEASE\spring-core-4.3.17.RELEASE.jar;C:\Users\Administrator\.m2\repository\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-expression\4.3.17.RELEASE\spring-expression-4.3.17.RELEASE.jar;C:\Users\Administrator\.m2\repository\junit\junit\4.12\junit-4.12.jar;C:\Users\Administrator\.m2\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit4 com.spring.MessageServiceTest,setMessage
1月 06, 2019 1:44:16 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@2890c451: startup date [Sun Jan 06 13:44:16 CST 2019]; root of context hierarchy
1月 06, 2019 1:44:16 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [spring-config.xml]
test
hello spring
Process finished with exit code 0

这里默认使用单例模式,可根据实际情况去挑选多例