这篇文章主要讲解了“Spring bean有哪几种注入方式”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“Spring bean有哪几种注入方式”吧！
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
/**
* @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 + '\'' +
'}';
}
}<?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="wyh2"/> <property name="school" value="hngy1"/> </bean> </beans>
@Test
public void student1(){
ApplicationContext context = new ClassPathXmlApplicationContext("student1.xml");
Student1 student1 = context.getBean("student1", Student1.class);
System.out.println(student1);
}/**
* @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 + '\'' +
'}';
}
}<?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="wyh3"/> <constructor-arg name="school" value="hngy2"/> </bean> </beans>
@Test
public void student2(){
ApplicationContext context = new ClassPathXmlApplicationContext("student2.xml");
Student2 student2 = context.getBean("student2", Student2.class);
System.out.println(student2);
}/**
* @Author: crush
* @Date: 2021-06-17 17:08
* version 1.0
*/
@Component
public class Student3 {
@Value("wyh4")
private String name;
@Value("hngy3")
private String school;
@Override
public String toString() {
return "Student3{" +
"name='" + name + '\'' +
", school='" + school + '\'' +
'}';
}
}<?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
public void student3(){
ApplicationContext context = new ClassPathXmlApplicationContext("student3.xml");
Student3 student3 = context.getBean("student3", Student3.class);
System.out.println(student3);
}/**
* @Author: crush
* @Date: 2021-06-17 17:16
* version 1.0
* JavaConfig 配置
*/
public class Student4 {
@Value("wyh5")
private String name;
@Value("hngy4")
private String school;
@Override
public String toString() {
return "Student4{" +
"name='" + name + '\'' +
", school='" + school + '\'' +
'}';
}
}@Configuration
public class Student4Config {
@Bean
public Student4 student4(){
return new Student4();
}
}<?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>
@Test
public void student4(){
ApplicationContext context = new ClassPathXmlApplicationContext("student4.xml");
Student4 student4 = context.getBean("student4", Student4.class);
System.out.println(student4);
}/**
* @Author: crush
* @Date: 2021-06-17 17:27
* version 1.0
* xml 配置
*/
public interface StudentService1 {
void test();
}/**
* @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 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>
感谢各位的阅读，以上就是“Spring bean有哪几种注入方式”的内容了，经过本文的学习后，相信大家对Spring bean有哪几种注入方式这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是亿速云，小编将为大家推送更多相关知识点的文章，欢迎关注！
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