Spring框架复习06-spring注解开发快速入门

r囧r小猫 2022-02-04 02:25 238阅读 0赞

## 第一步：引入jar包（这里是在前面的基础上添加的，就是多引入一个aop的jar包） ##

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##  第二步：配置文件引入约束（context约束） ##

这个约束是注解开发所必须的

xmlns:context="http://www.springframework.org/schema/context"  
http://www.springframework.org/schema/context  
http://www.springframework.org/schema/context/spring-context.xsd

<?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"
           xmlns:aop="http://www.springframework.org/schema/aop"
           xmlns:tx="http://www.springframework.org/schema/tx"
           xmlns:p="http://www.springframework.org/schema/p"
           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
            http://www.springframework.org/schema/aop
            http://www.springframework.org/schema/aop/spring-aop.xsd
            http://www.springframework.org/schema/tx
            http://www.springframework.org/schema/tx/spring-tx.xsd">
    
    
    </beans>

## 第三步：配置注解包扫描（扫描哪些包下的注解） ##

<context:component-scan base-package="com.ctbu"/>

## 第四步：在类上和属性上写上注解 ##

@Component("student")  //相当于是配置文件中配置时 bean中的id属性
    public class Student {
        private String name;
        private String age;
        private String sex;
    
        public String getName() {
            return name;
        }
    
        @Value("花木兰")  //相当于是配置文件中配置的时候，属性的注入
        public void setName(String name) {
            this.name = name;
        }
    
        public String getAge() {
            return age;
        }
    
        @Value("23")
        public void setAge(String age) {
            this.age = age;
        }
    
        public String getSex() {
            return sex;
        }
        @Value("女")
        public void setSex(String sex) {
            this.sex = sex;
        }
    
        @Override
        public String toString() {
            return "Student{" +
                    "name='" + name + '\'' +
                    ", age='" + age + '\'' +
                    ", sex='" + sex + '\'' +
                    '}';
        }
    }

## 第五步：编写测试类 ##

@Test
        public void test2(){
    
            //加载配置文件
            ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
    
            //获取配置的对象，通过配置文件中的id
            Student student = (Student) applicationContext.getBean("student");
    
            System.out.println(student);
        }

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