建立spring项目入门实例

Posted 2020-10-06 风起时只有我在

建立maven项目

打开pop.xml文件

添加springframework所依赖的包

<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.10.RELEASE</version>
        </dependency>

1、pom.xml文件内容如下

<?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>com.fz</groupId>
            <artifactId>spring01</artifactId>
            <version>1.0</version>
            <packaging>jar</packaging>
            <properties/>
            <dependencies>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>4.3.10.RELEASE</version>
            </dependency>
            <dependency>
              <groupId>org.projectlombok</groupId>
              <artifactId>lombok</artifactId>
              <version>1.16.18</version>
            </dependency>
            </dependencies>
            <build>
            <finalName>${project.artifactId}</finalName>
            <sourceDirectory>src/main/java</sourceDirectory>
            <testSourceDirectory>src/test/java</testSourceDirectory>
            <resources>
                <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
                </resource>
                <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.xml</include>
                    <include>**/*.properties</include>
                </includes>
                </resource>
            </resources>
            </build>
        </project>

2、在src/main/resources 建立

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-4.3.xsd">

　　　　　　　　<!-- spring框架默认bean的单例模式 -->
            <bean id="d" class="java.util.Date"/>
            <bean name="/user/book" class="com.fz.entity.Book"/>

</beans>

3、编写程序要使用的类

src/main/java/com/fz/entity/Book.java
        package com.fz.entity;
        import lombok.Data;
        /**
         * Created by webrx on 2017-09-07.
         */

        @Data
        public class Book {
            private int id;
            private String name;
        }

4、测试框架代码

src/test/com/Demo.java
    
    package com;
    import com.fz.entity.Book;
    import org.junit.Test;
    import org.springframework.beans.factory.BeanFactory;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    import java.util.Date;

    /**
     * Created by webrx on 2017-09-07.
     */
    public class Demo {
        @Test
        public void tt(){
        BeanFactory f = new ClassPathXmlApplicationContext("applicationContext.xml"); //建立bean工厂
        Date d1 = f.getBean(Date.class);
        Date d2 = f.getBean("d",Date.class);
        System.out.println(d1==d2);
        System.out.println(d1.toLocaleString());
        System.out.println(d2.toLocaleString());

        Book b = f.getBean(Book.class);
        Book book = f.getBean("/user/book",Book.class);
        System.out.println(book);
        b.setId(100);
        b.setName("java书籍");
        System.out.println(b);
        System.out.println(b==book);
        }
    }

 

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