Spring入门——Helloworld

- 日理万妓 2022-06-08 06:17 217阅读 0赞

# 前言 #

跟着网上spring教程学习一个入门实例

# 项目结构 #

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# 步骤 #

创建一个maven project,输入Group Id:com.yiibai Artifact Id:HelloSpring

右击项目——poperties——Java Coompiler

![Center 1][]

pom.xml

<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.yiibai</groupId>
      <artifactId>HelloSpring</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      
      <dependencies>
      	<dependency>
      		<groupId>org.springframework</groupId>
      		<artifactId>spring-core</artifactId>
      		<version>4.1.4.RELEASE</version>
      	</dependency>
      		
      	<dependency>
      		<groupId>org.springframework</groupId>
      		<artifactId>spring-context</artifactId>
      		<version>4.1.4.RELEASE</version>
      	</dependency>
      </dependencies>
    </project>

HelloWorld.java

package com.yiibai.totorial.spring.helloworld;
    
    public interface HelloWorld {
    	public void sayHello();
    
    }

HelloWorldService.java

package com.yiibai.totorial.spring.helloworld;
    
    public class HelloWorldService {
    	
    	private HelloWorld helloWorld;
    	
    	public HelloWorld getHelloWorld() {
    		return helloWorld;
    	}
    
    	public void setHelloWorld(HelloWorld helloWorld){
    		this.helloWorld=helloWorld;
    	}
    
    }

SpringHelloWorld.java

package com.yiibai.totorial.spring.helloworld.impl;
    
    import com.yiibai.totorial.spring.helloworld.HelloWorld;
    
    public class SpringHelloWorld implements HelloWorld {
    	
    	@Override
    	public void sayHello(){
    		System.out.println("Spring Say Hello!");
    	}
    
    }

StrutsHelloWorld.java

package com.yiibai.totorial.spring.helloworld.impl;
    
    import com.yiibai.totorial.spring.helloworld.HelloWorld;
    
    public class StrutsHelloWorld implements HelloWorld {
    
    	
    	@Override
    	public void sayHello(){
    		System.out.println("Struts Say  Hello!");
    	}
    	
    }

HelloProgram.java

package com.yiibai.totorial.spring;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    import com.yiibai.totorial.spring.helloworld.HelloWorld;
    import com.yiibai.totorial.spring.helloworld.HelloWorldService;
    
    public class HelloProgram {
    	
    	public static void main(String[] args){
    		ApplicationContext context = 
    				new ClassPathXmlApplicationContext("beans.xml");
    		
    		HelloWorldService service =
    				(HelloWorldService)context.getBean("helloWorldService");
    		
    		 HelloWorld hw= service.getHelloWorld();
             
    	     hw.sayHello();
    	}
    
    }

beans.xml

执行Run As Java Application

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beans.xml配置文件改为

执行后结果为：

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# 工作原理 #

![Center 4][]

[Center]: /images/20220608/54c69d6d6554425fbd3a34ced64b5e0e.png
[Center 1]: /images/20220608/b71fb3979ee54bb68eda881cc891add2.png
[Center 2]: /images/20220608/459079fc63b74a40a94a91924905f1a6.png
[Center 3]: /images/20220608/e39bc72693f2461b9a79c1936b8f406e.png
[Center 4]: /images/20220608/2f79bbbcc01140229420950e9b9eee6d.png