spring 入门1 --- 使用spring创建第一个小的测试程序

<?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.yang</groupId>
    <artifactId>com.yang-20200112</artifactId>
    <version>1.0-SNAPSHOT</version>
    <!-- 安装一下我们需要的依赖 -->
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.3.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.3.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>4.3.7.RELEASE</version>
        </dependency>

        <!-- 这个是日志模块， 不是spring的依赖-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.14</version>
        </dependency>
        <!-- junit测试框架 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13-rc-2</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

package com.yang;

public class Person {
    private int id;
    private String Name;
    private String sex;

    public Person() {

    }

    public Person(int id, String name, String sex) {
        this.id = id;
        Name = name;
        this.sex = sex;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String toString() {
        return String.format("Person id: %s, name:%s, sex: %s", this.id, this.Name, this.sex);
    }

}

<?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">

    <!--id, name 必须是唯一的， id里面不可以有特殊字符，在创建时，spring可以通过id或者name找到这bean-->
    <bean id="personId" name="personName" class="com.yang.Person">
        <!--这个就是实例时的初始值-->
        <property name="id" value="1" />
        <property name="name" value="ning" />
        <property name="sex" value="female" />
    </bean>
</beans>

# log4J日志框架的配置文件 文件名字不能改
# DEBUG 表示日志的级别  调试
# Console 日志打印在控制台
log4j.rootLogger=INFO, Console 
log4j.appender.Console=org.apache.log4j.ConsoleAppender  
log4j.appender.Console.layout=org.apache.log4j.PatternLayout  
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n  

# 哪些日志需要打印
log4j.logger.java.sql.ResultSet=INFO  
log4j.logger.org.apache=INFO  
log4j.logger.java.sql.Connection=DEBUG  
log4j.logger.java.sql.Statement=DEBUG  
log4j.logger.java.sql.PreparedStatement=DEBUG 

package com.yang.test;

import com.yang.Person;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class PersonTest {
    /**
     * 这个是传统方法进行的测试
     */
    @Test
    public void test1(){
        Person p1 = new Person(1, "ming", "female");
        System.out.println(p1);
    }

    /**
     * 这个是基于spring进行的测试，我们可以发现，对象不再由我们进行创建，而是交给spring，
     * 这样做的好处是，项目编译完成，我们还可以调整配置文件，改变输出的值，这样不就实现了解耦
     */
    @Test
    public void test2(){
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        Person person = (Person) ac.getBean("personId");
        System.out.println(person);
    }
}