01 Spring HelloWorld

环境:

IDEA 2019.2

jdk 1.8及以上

Maven 3以上

1. 创建Maven的Web项目,然后导入依赖:

<?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>club.swzdl.spring</groupId>
    <artifactId>spring</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>spring Maven Webapp</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <!--测试-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-expression -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/commons-logging/commons-logging -->
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>

    </dependencies>

    <build>
        <finalName>spring</finalName>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.22.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>3.2.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

2. 在src目录下新建java文件夹,作为java代码的存放文件夹,新建Spring xml描述文件,名为applicationContext.xml

   

3. 在src目录下新建包Hello,在包下新建类HelloWorld.java

   HelloWorld.java:

   package hello;/*
    * @Author Sheng WenZeng
    * @Date 2019/8/4 15:22
    * @Version 1.0
    */
   
   /**
    * @author Sheng Wenzeng
    * @ClassName HelloWorld
    * @Description TODO
    * @Date 2019/8/4 15:22
    * @Version 1.0
    */
   public class HelloWorld {
       private String name_1;
       private String name_2;
   
       void hello() {
           System.out.println(name_1 + name_2);
       }
   
       public void setName_1(String name_1) {
           this.name_1 = name_1;
       }
   
       public void setName_2(String name_2) {
           this.name_2 = name_2;
       }
   }

4. 在applicationContext.xml中写入bean

   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">
   
       <!--    配置bean-->
       <bean id="helloWord" class="hello.HelloWorld">
           <property name="name_1" value="Hello"/>
           <property name="name_2" value="World"/>
       </bean>
   </beans>

5. 新建Hello类

   Hello.java:

   package hello;
   /*
    * @Author Sheng WenZeng
    * @Date 2019/8/4 15:24
    * @Version 1.0
    */
   
   import org.springframework.context.ApplicationContext;
   import org.springframework.context.support.ClassPathXmlApplicationContext;
   
   /**
    * @author Sheng Wenzeng
    * @ClassName Hello
    * @Description TODO
    * @Date 2019/8/4 15:24
    * @Version 1.0
    */
   public class Hello {
       public static void main(String[] args) {
           //这一步会自动执行HelloWorld的构造方法,并将name值通过其中的set方法赋给name
           ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
           HelloWorld helloWorld = (HelloWorld) ctx.getBean("helloWord");
           helloWorld.hello();
       }
   }

6. 运行Hello.java

   "C:\Program Files\Java\jdk1.8.0_211\bin\java.exe" ...
   HelloWorld
   
   Process finished with exit code 0