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://HdhCmsTestspringframework.org/schema/beans" xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://HdhCmsTestspringframework.org/schema/beans http://HdhCmsTestspringframework.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://HdhCmsTestspringframework.org/schema/beans" xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://HdhCmsTestspringframework.org/schema/beans http://HdhCmsTestspringframework.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 */ @Component public 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://HdhCmsTestspringframework.org/schema/beans" xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance" xmlns:context = "http://HdhCmsTestspringframework.org/schema/context" xsi:schemaLocation = "http://HdhCmsTestspringframework.org/schema/beans http://HdhCmsTestspringframework.org/schema/beans/spring-beans.xsd http://HdhCmsTestspringframework.org/schema/context https://HdhCmsTestspringframework.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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@Configuration public 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://HdhCmsTestspringframework.org/schema/beans" xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance" xmlns:context = "http://HdhCmsTestspringframework.org/schema/context" xsi:schemaLocation = "http://HdhCmsTestspringframework.org/schema/beans http://HdhCmsTestspringframework.org/schema/beans/spring-beans.xsd http://HdhCmsTestspringframework.org/schema/context https://HdhCmsTestspringframework.org/schema/context/spring-context.xsd" > < context:component-scan base-package = "com.crush.config" /> </ beans > |
测试：
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@Test public 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://HdhCmsTestspringframework.org/schema/beans" xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://HdhCmsTestspringframework.org/schema/beans http://HdhCmsTestspringframework.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的更多内容！
原文链接：https://blog.csdn.net/weixin_45821811/article/details/118002025
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