UserController

package com.aistart.controller;import com.aistart.pojo.Student;
import com.aistart.service.UserService;
import com.aistart.service.impl.UserServiceImpl;public class UserController {/*依赖抽象*/UserService userService;public void setUserService(UserService userService) {this.userService = userService;}public String Login(Student student){boolean login = userService.login(student);if (login)return "yes";else return "no";}}

UserMapperImpl

package com.aistart.mapper.impl;import com.aistart.mapper.UserMapper;
import com.aistart.pojo.Student;public class UserMapperImpl implements UserMapper {@Overridepublic int selectUser(Student student) {System.out.println("这里是查找是否有用户的mapper");return 0;}
}

School.java

package com.aistart.pojo;public class School {private String schoolName;public School(String schoolName) {this.schoolName = schoolName;}public School() {System.out.println("school的无参被调用了");}public String getSchoolName() {return schoolName;}public void setSchoolName(String schoolName) {this.schoolName = schoolName;}@Overridepublic String toString() {final StringBuilder sb = new StringBuilder("School{");sb.append("schoolName='").append(schoolName).append('\'');sb.append('}');return sb.toString();}
}

Student.java

package com.aistart.pojo;public class Student {private String stuName;private Integer age;private School school;public School getSchool() {return school;}public void setSchool(School school) {this.school = school;}public Student() {System.out.println("student无参被调用了");}public Student(String stuName, Integer age) {this.stuName = stuName;this.age = age;}public String getStuName() {return stuName;}public void setStuName(String stuName) {this.stuName = stuName;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}@Overridepublic String toString() {final StringBuilder sb = new StringBuilder("Student{");sb.append("stuName='").append(stuName).append('\'');sb.append(", age=").append(age);sb.append(", school=").append(school);sb.append('}');return sb.toString();}
}

UserServiceImpl.java

package com.aistart.service.impl;import com.aistart.mapper.UserMapper;
import com.aistart.mapper.impl.UserMapperImpl;
import com.aistart.pojo.Student;
import com.aistart.service.UserService;public class UserServiceImpl implements UserService {UserMapper userMapper;public void setUserMapper(UserMapper userMapper) {this.userMapper = userMapper;}@Overridepublic boolean login(Student student) {//        具体事先System.out.println("这是login的service业务");/*判断各种*/int i = userMapper.selectUser(student);if (i==1){return true;}return false;}
}

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"><!--第二步,创建元数据--><!--id就相当于这个对象的唯一标识,理解为这对象在容器中的"变量名"--><!--bean中,调用默认的构造方法,去创建--><bean id="alice" class="com.aistart.pojo.Student"><property name="stuName" value="Alice"/><!--标签中,相当于键值对,name:value--><!--name等同于属性名--><!--value等同于注入的值注意,不管加入什么类型都是""引起来的--><property name="age" value="19"/><!--这个标签,其实是执行了set方法去注入的--><!--一定要有set方法--><!--name   搭配value和refvalue是简单类型,字面量能够赋值的ref是引入类型,是外部获取得另一个对象--><property name="school" ref="ksdx"/><!-- 这个bean的合作者和配置在这里 --></bean><bean id="sqxy" class="com.aistart.pojo.School"><!-- 这个bean的合作者和配置在这里 --><property name="schoolName" value="小清华"></property></bean><bean id="ksdx" class="com.aistart.pojo.School"><!-- 这个bean的合作者和配置在这里 --><property name="schoolName" value="呼呼睡觉"></property></bean><!-- 更多bean 定义在这里 --><bean id="userController" class="com.aistart.controller.UserController"><property name="userService" ref="userService"></property></bean><bean id="userService" class="com.aistart.service.impl.UserServiceImpl"><property name="userMapper" ref="userMapper"></property></bean><bean id="userMapper" class="com.aistart.mapper.impl.UserMapperImpl"/></beans>

UserControllerTest.java

package com.aistart.controller;import com.aistart.pojo.Student;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import static org.junit.Assert.*;public class UserControllerTest {@Testpublic void login() {/*利用spring容器获取controller对象*/ApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml");UserController userController = (UserController) context.getBean("userController");String login = userController.Login(new Student());System.out.println(login);}
}

StudentTest.java

package com.aistart.pojo;import org.junit.Test;
import org.springframework.beans.BeanUtils;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.support.ClassPathXmlApplicationContext;import static org.junit.Assert.*;public class StudentTest {@Testpublic void test(){/*传统的注入方式*//*1.构造器注入*/Student alice = new Student("Alice", 18);/*2.用set方法注入*/Student student = new Student();student.setStuName("Bob");student.setAge(19);}/*使用spring来创建对象*/@Testpublic void beanTest(){/*第三步,实例化一个容器*//*无参被调用说明:容器不单单是加载xml,并且根据xml去创建对象,全都创建了*//*创建的同时应该将值注入其中*/ApplicationContext context = new ClassPathXmlApplicationContext("ApplicationContext.xml");/*第四步,获取实例对象** 参数:是xml中对象实例的id* 返回:类型都是Object* */Student alice =(Student) context.getBean("alice");Student alice1 =(Student) context.getBean("alice");/*在spring容器中,对象实例默认都是单例的*/System.out.println(alice1==alice);System.out.println(alice);}
}

pom.xml

<?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.aistart</groupId><artifactId>Spring_demo</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><!--第一步,导入环境--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.2</version><scope>test</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.3.30</version></dependency></dependencies></project>