一、Set方式注入
pojo层：
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/** * @Author: crush * @Date: 2021-06-17 16:57 * version 1.0 * xml 配置注入版本 set 方式 */public class Student1 { public String name; public String school; public void setName(String name) { this.name = name; } public void setSchool(String school) { this.school = school; } @Override public String toString() { return "Student1{" + "name='" + name + '\'' + ", school='" + school + '\'' + '}'; }} |
1.xml 文件
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<?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"> <!--set方式注入 id是注入bean中的名字 class 是全限定类名 property 是按照set方式注入 --> <bean id="student1" class="com.crush.pojo.Student1"> <property name="name" value="wyh1"/> <property name="school" value="hngy1"/> </bean></beans> |
test测试
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@Test public void student1(){ ApplicationContext context = new ClassPathXmlApplicationContext("student1.xml"); Student1 student1 = context.getBean("student1", Student1.class); System.out.println(student1); } |
二、构造函数方式注入
pojo层
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/** * @Author: crush * @Date: 2021-06-17 17:02 * version 1.0 * xml 配置 构造函数方式注入 */public class Student2 { private String name; private String school; public Student2(String name, String school) { this.name = name; this.school = school; } @Override public String toString() { return "Student2{" + "name='" + name + '\'' + ", school='" + school + '\'' + '}'; }} |
2.xml文件
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<?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"> <!--set方式注入 id是注入bean中的名字 class 是全限定类名 constructor 是按照构造方式注入 index 是按照成员变量在构造函数中的参数的第几个 name 表示成员变量名 type 表示类型 value 表示值 ref 表示引用 可引用另外一个注入到Spring的中的值 --> <bean id="student2" class="com.crush.pojo.Student2"> <constructor-arg index="0" name="name" type="java.lang.String" value="wyh2"/> <constructor-arg name="school" value="hngy2"/> </bean></beans> |
test测试
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@Test public void student2(){ ApplicationContext context = new ClassPathXmlApplicationContext("student2.xml"); Student2 student2 = context.getBean("student2", Student2.class); System.out.println(student2); } |
三、注解注入
pojo层
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/** * @Author: crush * @Date: 2021-06-17 17:08 * version 1.0 */@Componentpublic class Student3 { @Value("wyh3") private String name; @Value("hngy3") private String school; @Override public String toString() { return "Student3{" + "name='" + name + '\'' + ", school='" + school + '\'' + '}'; }} |
3.xml文件
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<?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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <!--注解方式注入 需要扫描注解在的包 注解才会生效 --> <context:component-scan base-package="com.crush.pojo"/></beans> |
test测试
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@Test public void student3(){ ApplicationContext context = new ClassPathXmlApplicationContext("student3.xml"); Student3 student3 = context.getBean("student3", Student3.class); System.out.println(student3); } |
四、JavaConfig 方式注入
pojo层
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/** * @Author: crush * @Date: 2021-06-17 17:16 * version 1.0 * JavaConfig 配置 */public class Student4 { @Value("wyh4") private String name; @Value("hngy4") private String school; @Override public String toString() { return "Student4{" + "name='" + name + '\'' + ", school='" + school + '\'' + '}'; }} |
JavaConfig 类
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@Configurationpublic class Student4Config { @Bean public Student4 student4(){ return new Student4(); }} |
xml文件 扫描包
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<?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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="com.crush.config"/></beans> |
测试：
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@Testpublic void student4(){ ApplicationContext context = new ClassPathXmlApplicationContext("student4.xml"); Student4 student4 = context.getBean("student4", Student4.class); System.out.println(student4);} |
五、Service层注入详解
service
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/** * @Author: crush * @Date: 2021-06-17 17:27 * version 1.0 * xml 配置 */public interface StudentService1 { void test();} |
serviceImpl
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/** * @Author: crush * @Date: 2021-06-17 17:29 * version 1.0 * xml 配置 */public class StudentService1Impl implements StudentService1{ @Override public void test() { System.out.println("===StudentDao1Impl==="); }} |
xml配置文件
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<?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"> <bean id="studentService1" class="com.crush.dao.StudentService1" /></beans> |
总结
本篇文章就到这里了，希望能给你带来帮助，也希望能够您能够关注服务器之家的更多内容！
原文链接：https://blog.csdn.net/weixin_45821811/article/details/118002025
