Spring框架学习（1）——HelloWorld

1.创建一个名为spring-01-hello的Maven项目，结构如下

2.引入依赖jar包，代码如下

<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.yc</groupId>  <artifactId>spring-01-hello</artifactId>  <version>0.0.1-SNAPSHOT</version>  <packaging>jar</packaging>  <name>spring-01-hello</name>  <url>http://maven.apache.org</url>  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties>  <dependencies>    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>4.12</version>      <scope>test</scope>    </dependency>    <!-- 引入spring框架的依赖 -->    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-context</artifactId>      <version>4.3.2.RELEASE</version>      <scope>runtime</scope>    </dependency>  </dependencies></project>

3.创建实体类Hello.java和Person.java

package com.yc.spring;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Component;@Component("hello") //创建一个Hello这个类的对象，交给spring容器管理，对象名为hello@Scope("prototype")//原型对象，默认为单例对象public class Hello {    private String name="无名氏";    @Autowired  //自动注入对象    private Person person;    public Hello() {            System.out.println("我是Hello的无参构造方法....");    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Person getPerson() {        return person;    }    public void setPerson(Person person) {        this.person = person;    }    public void sayHello(){        System.out.println(String.format("%s 对 %s说 你好帅！！", name,person.getName()));    }    @Override    public String toString() {        return "Hello [name=" + name + "]";    }}

package com.yc.spring;import org.springframework.stereotype.Component;@Component("person")public class Person {        private String name="帅哥";        public String getName() {            return name;        }        public void setName(String name) {            this.name = name;        }        @Override        public String toString() {            return "Person [name=" + name + "]";        }}

4.创建Spring配置文件spring.xml,代码如下

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"    xmlns:util="http://www.springframework.org/schema/util" xmlns:context="http://www.springframework.org/schema/context"    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"    xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/util         http://www.springframework.org/schema/util/spring-util.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context.xsd        http://www.springframework.org/schema/aop         http://www.springframework.org/schema/aop/spring-aop.xsd        http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx.xsd">    <!-- 扫描bean包  就是由spring容器创建好的对象-->    <!-- 制定可以作为spring容器管理的对象的包 -->    <context:component-scan base-package="com.yc.spring" /></beans>

5.创建测试类HelloTest.java,代码如下

package com.yc.spring;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class HelloTest {    @Test    public void testIOC() {        Hello h=new Hello();        System.out.println(h);    }    @Test    public void testIOC02() {        ApplicationContext cxt=new ClassPathXmlApplicationContext("spring.xml");        System.out.println("======================");        Hello h01=(Hello) cxt.getBean("hello");        System.out.println(h01);        h01.sayHello();        System.out.println("======================");        Hello h=(Hello) cxt.getBean("hello");        System.out.println(h);        h.sayHello();        if (h01==h) {            System.out.println("同一对象");        }else {            System.out.println("不同对象");        }    }}