Spring入门第一篇（Hello World）

浅浅的花香味﹌ 2022-05-09 12:14 272阅读 0赞

前面我写了一篇关于如何在eclipse安装Spring的文章

[eclipse安装Spring][eclipse_Spring]

现在开始第一个spring项目Hello world

### 准备工作 ###

下载架包  
Spring-Framework:  
[https://repo.spring.io/libs-release-local/org/springframework/spring/4.2.4.RELEASE/spring-framework-4.2.4.RELEASE-dist.zip][https_repo.spring.io_libs-release-local_org_springframework_spring_4.2.4.RELEASE_spring-framework-4.2.4.RELEASE-dist.zip]

commons-logging:  
[https://mvnrepository.com/artifact/commons-logging/commons-logging/1.2][https_mvnrepository.com_artifact_commons-logging_commons-logging_1.2]  
![在这里插入图片描述][70]

把上面的文件解压到同一个目录下

新建一个Java 项目，右键New–>Project

![在这里插入图片描述][70 1]

![在这里插入图片描述][70 2]

在项目目录下一个文件夹lib

将spring-framework-4.2.4.RELEASE\\libs下的这几个文件和commons-logging-1.2下的commons-logging-1.2.jar拷到我们新建的lib里面  
![在这里插入图片描述][70 3]  
加入build path，右键点击项目——properties——java build path，在libraries标签下点——add JARs…  
![在这里插入图片描述][70 4]

添加demo\\lib里面的jar包  
然后点Apply and close

### 建立文件 ###

在src下建立一个包  
![在这里插入图片描述][70 5]

新建HelloWorld.java

package demo;
    
    public class HelloWorld {
    	 
    	public void say(){
    		System.out.println("|^^^^^^^^^^^^^^^^^^^^^^^|");
    		System.out.println("|      hello world      |");
    		System.out.println("|_______________________|");
    		System.out.println("Spring 入门第一篇！");
    	}
    }

新建Main.java

package demo;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Main {
    	 
    	/**
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		ApplicationContext a = new ClassPathXmlApplicationContext("classpath:/application.xml");
            HelloWorld hello = a.getBean("HelloWorld",HelloWorld.class);
    	    hello.say();
    	}
     
    }

*  注意：需要手动导入两个包
 *  import org.springframework.context.ApplicationContext;  
    import org.springframework.context.support.ClassPathXmlApplicationContext;

不然会报错：  
![在这里插入图片描述][70 6]

然后在src下建立application.xml  
![在这里插入图片描述][70 7]

![在这里插入图片描述][70 8]

选择Spring Bean Configuration File

<?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="HelloWorld" class="demo.HelloWorld"></bean>
    </beans>

添加bean这一行

然后在Main下点击application  
![在这里插入图片描述][70 9]

结果如下：

![在这里插入图片描述][70 10]

[eclipse_Spring]: https://blog.csdn.net/github_39533414/article/details/82952815
[https_repo.spring.io_libs-release-local_org_springframework_spring_4.2.4.RELEASE_spring-framework-4.2.4.RELEASE-dist.zip]: https://repo.spring.io/libs-release-local/org/springframework/spring/4.2.4.RELEASE/spring-framework-4.2.4.RELEASE-dist.zip
[https_mvnrepository.com_artifact_commons-logging_commons-logging_1.2]: https://mvnrepository.com/artifact/commons-logging/commons-logging/1.2
[70]: /images/20220509/558f72b163f341ae91823703ebb33ced.png
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