Spring|Spring bean 四种注入方式详解 Springbean四种注入方式详解

一、Set方式注入

pojo层：
1.xml 文件
test测试

二、构造函数方式注入

pojo层
2.xml文件
test测试

三、注解注入

pojo层
3.xml文件
test测试

四、JavaConfig 方式注入

pojo层
JavaConfig 类
xml文件扫描包
测试：

五、Service层注入详解

service
serviceImpl
xml配置文件

总结

一、Set方式注入
pojo层：

/** * @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; }@Overridepublic String toString() {return "Student1{" +"name='" + name + '\'' +", school='" + school + '\'' +'}'; }}

1.xml 文件

test测试

@Testpublic 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

/** * @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; }@Overridepublic String toString() {return "Student2{" +"name='" + name + '\'' +", school='" + school + '\'' +'}'; }}

2.xml文件

test测试

@Testpublic 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

/** * @Author: crush * @Date: 2021-06-17 17:08 * version 1.0 */@Componentpublic class Student3 {@Value("wyh3")private String name; @Value("hngy3")private String school; @Overridepublic String toString() {return "Student3{" +"name='" + name + '\'' +", school='" + school + '\'' +'}'; }}

3.xml文件

test测试

@Testpublic 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

/** * @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; @Overridepublic String toString() {return "Student4{" +"name='" + name + '\'' +", school='" + school + '\'' +'}'; }}

JavaConfig 类

@Configurationpublic class Student4Config {@Beanpublic Student4 student4(){return new Student4(); }}

xml文件扫描包

测试：

@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

/** * @Author: crush * @Date: 2021-06-17 17:27 * version 1.0 * xml 配置 */public interface StudentService1 {void test(); }

serviceImpl

/** * @Author: crush * @Date: 2021-06-17 17:29 * version 1.0 * xml 配置 */public class StudentService1Impl implements StudentService1{@Overridepublic void test() {System.out.println("===StudentDao1Impl==="); }}

xml配置文件

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