Spring(注解方式)简单入门

环境准备

1. maven
2. jdk
3. Spring
4. Eclipse

项目创建

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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.cyb</groupId>
  <artifactId>spring</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>spring Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
            <!-- spring 核心组件中的4个依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>

         <!-- 单元测试Junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
  </dependencies>
  <build>
    <finalName>spring</finalName>
            <plugins>
            <!-- 配置Maven的JDK编译级别 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
  </build>
</project>

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"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.cyb.service"></context:component-scan>
</beans>

UserService.java

package com.cyb.service;

public interface UserService {
    void speak();
}

UserServiceImpl.java

其他注解：@Component、@Controller、@Service、@Repository

package com.cyb.service;

import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    @Override
    public void speak() {
        System.out.println("陈彦斌博客：https://www.cnblogs.com/chenyanbin/");
    }
}

TestUserService.java

package com.cyb.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.cyb.service.UserService;

public class TestUserService {
    @Test
    public void TestIoc() {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService service1 = context.getBean(UserService.class);
        service1.speak();
    }
}

项目结构

测试