IDEA下——Spring入门程序

创建一个Maven的项目，我的项目结构如下：
在pom文件里写下需要导入的依赖：

	<?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.abc</groupId>

       <artifactId>01-first(Spring)</artifactId>

       <version>1.0-SNAPSHOT</version>

       <build>

           <plugins>

               <plugin>

                   <groupId>org.apache.maven.plugins</groupId>

                   <artifactId>maven-compiler-plugin</artifactId>

                   <configuration>

                       <source>6</source>

                      <target>6</target>

                   </configuration>

               </plugin>

           </plugins>

       </build>

       <properties>

           <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

           <maven.compiler.source>10</maven.compiler.source>

           <maven.compiler.target>10</maven.compiler.target>

           <spring.version>5.1.0.RELEASE</spring.version>

       </properties>

       <dependencies>

           <dependency>

               <groupId>org.springframework</groupId>

               <artifactId>spring-beans</artifactId>

               <version>${spring.version}</version>

           </dependency>

           <dependency>

               <groupId>org.springframework</groupId>

               <artifactId>spring-core</artifactId>

               <version>${spring.version}</version>

           </dependency>

           <dependency>

               <groupId>org.springframework</groupId>

               <artifactId>spring-context</artifactId>

               <version>${spring.version}</version>

           </dependency>

           <dependency>

               <groupId>org.springframework</groupId>

               <artifactId>spring-expression</artifactId>

               <version>${spring.version}</version>

           </dependency>

           <dependency>

               <groupId>org.springframework</groupId>

               <artifactId>spring-jcl</artifactId>

               <version>${spring.version}</version>

           </dependency>

           <dependency>

               <groupId>junit</groupId>

               <artifactId>junit</artifactId>

               <version>4.12</version>

               <scope>test</scope>

           </dependency>

       </dependencies>

       <build>

           <plugins>

               <plugin>

                   <artifactId>maven-compiler-plugin</artifactId>

                   <configuration>

                       <source>1.10</source>

                       <target>1.10</target>

                   </configuration>

               </plugin>

           </plugins>

       </build>

     </project>

在Java文件夹下新建package，在package包下新建接口及其实现类

接口：

    public interface SomeService {

	          void doSome();

     }

实现类：

    public class SomeServiceImpl implements SomeService {

	public SomeServiceImpl() {

    	System.out.println("创建SomeServiceImpl对象");

	}

	@Override

	public void doSome() {

    	System.out.println("执行SomeServiceImpl里的doSome()方法");

	}

    }

在resources目录下新建applicationContext.xml文件

我们需要在spring容器的配置文件中进行注册该Bean

spring使用的配置文件为xml文件，当然需要引入约束文件，一般将spring的配置文件命名为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">

 	<!--注册Servcie其造价于如下代码：   SomeServiceImpl someService = new SomeServiceImpl();

                其底层是通过反射机制创建的someService对象

        Object someService = Class.forName("com.abc.service.SomeServiceImpl").newInstance();-->

 	           <bean id="someService" class="com.abc.service.SomeServiceImpl"/>

 </beans>

* spring的根元素是benas显然是注册Bean，子标签是Bean

* 注册:`<bean id="someService" class="com.abc.service.SomeServiceImpl"/>`

* id属性为了唯一确定一个对象，class属性里边应写类全名

5. 注册完毕后我们要在测试类中获取spring容器,而获取Spring容器有两种方式。

package com.abc.service;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import org.springframework.context.support.FileSystemXmlApplicationContext;

public class SomeServiceImplTTest {

	 // spring容器获取的两种方式

	 @Test

	 public void test01(){

	     //在类路径下加载Spring配置文件

	     ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");

	     //在当前目录的根下加载该配置文件,路径应为文件实际存放的目录

	        ApplicationContext ac2 = new FileSystemXmlApplicationContext

                   ("D:\\IDEA-workspace\\01-first(Spring)\\src\\main\\resources\\applicationContext.xml");

	        System.out.println(ac2);

	  }

	@Test

	public void test02() {

	     // 加载Spring配置文件，创建Spring容器对象

	     ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");

		 //调用spring容器的getBean方法获取carImpl，方法参数为bean的id

	     SomeService service = (SomeService) ac.getBean("SomeService");

	     service.doSome();

	    }

	}

Spring入门程序到此就结束了

巴特西

IDEA下——Spring入门程序

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