*#本文为上课时实例,篇幅较长,请耐心查阅
创建对象,等同于功能
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.6.RELEASE</version>
</dependency>
package cn.kgc.entity;
import org.springframework.stereotype.Component;
@Component(value = "myUser")
public class User {
private Integer id;
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
<?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">
<!--声明组件扫描器-->
<context:component-scan base-package="cn.kgc.entity"/>
</beans>
package cn.kgc.test;
import cn.kgc.entity.User;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestSpring {
@Test
public void testdemo001(){
String conf = "applicationContext.xml";
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext(conf);
User myUser = (User) ac.getBean("myUser");
System.out.println(myUser);
}
}
第一种拓展:@Component( “myUser”)
第二种拓展:@Component
用在持久层上面,方法在dao的实现类上面,表示创建dao对象
public interface UserMapper {
public Integer addUser();
}
@Repository(value = "userMapper") //在申明XXMapper的bean对象的时候,@Respository中的value不建议省略
public class UserMapperImpl implements UserMapper{
@Override
public Integer addUser() {
System.out.println("调用持久层方法....");
return 0;
}
}
<?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">
<!--声明组件扫描器-->
<context:component-scan base-package="cn.kgc.dao"/>
</beans>
public class TestSpring {
@Test
public void testdemo001(){
String conf = "applicationContext.xml";
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext(conf);
UserMapper u = (UserMapper) ac.getBean("userMapper");
System.out.println(u.addUser());
}
}
用在业务层上面,放在service的实现类上面,表示创建service对象,可以有一些事务功能
public interface UserService {
public Integer addUser();
}
@Service(value = "userService")
public class UserServiceImpl implements UserService{
@Override
public Integer addUser() {
System.out.println("调用addUserService....");
return 0;
}
}
<?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">
<!--声明组件扫描器-->
<context:component-scan base-package="cn.kgc"/>
</beans>
public class TestSpring {
@Test
public void testdemo001(){
String conf = "applicationContext.xml";
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext(conf);
UserService userService = (UserService) ac.getBean("userService");
System.out.println(userService.addUser());
}
}
用在控制器上面,放在控制器上面,创建控制前对象,能够接受用户提交的参数,显示请求的处理结果
@Controller(value = "userController")
public class UserController {
public Integer addUser(){
System.out.println("调用userController.....");
return 0;
}
}
<?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">
<!--声明组件扫描器-->
<context:component-scan base-package="cn.kgc"/>
</beans>
public class TestSpring {
@Test
public void testdemo001(){
String conf = "applicationContext.xml";
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext(conf);
UserController userController = (UserController) ac.getBean("userController");
System.out.println(userController.addUser());
}
}
给简单类型属性对象赋值
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.6.RELEASE</version>
</dependency>
package cn.kgc.entity;
import org.springframework.stereotype.Component;
@Component
public class User {
@Value(value = "1")
private Integer id;
@Value(value = "zs")
private String name;
//注意:@Value等价于set()方法,无需再定义set()
public Integer getId() {
return id;
}
public String getName() {
return name;
}
}
<?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">
<!--声明组件扫描器-->
<context:component-scan base-package="cn.kgc.entity"/>
</beans>
package cn.kgc.test;
import cn.kgc.entity.User;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestSpring {
@Test
public void testdemo001(){
String conf = "applicationContext.xml";
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext(conf);
User myUser = (User) ac.getBean("user");
System.out.println(myUser.getId()+" "+myUser.getName());
}
}
给引用类型属性赋值(自动装配Bean),使用,默认使用byType自动注入。
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.6.RELEASE</version>
</dependency>
package cn.kgc.entity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class User {
@Value(value = "1")
private Integer id;
@Value(value = "zs")
private String name;
@Autowired
private Role role;
@Autowired
private SonRole sonRole;
public SonRole getSonRole() {
return sonRole;
}
public Role getRole() {
return role;
}
public Integer getId() {
return id;
}
public String getName() {
return name;
}
}
package cn.kgc.entity;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class Role {
@Value(value = "99")
private Integer rId;
@Value(value = "老师")
private String rName;
public Integer getrId() {
return rId;
}
public String getrName() {
return rName;
}
}
@Component
public class SonRole extends Role{
}
<?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">
<!--声明组件扫描器-->
<context:component-scan base-package="cn.kgc.entity"/>
</beans>
package cn.kgc.test;
import cn.kgc.entity.User;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestSpring {
@Test
public void testdemo001(){
String conf = "applicationContext.xml";
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext(conf);
User myUser = (User) ac.getBean("user");
System.out.println(myUser.getId()+" "+myUser.getName()+" "+myUser.getRole().getrName()+" "+myUser.getSonRole().getrName());
}
}
给引用类型赋值,Spring提供了对JDK注解@Resource的支持,默认按名称注入,如果按名称注入失败,自动按类型注入
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.6.RELEASE</version>
</dependency>
package cn.kgc.entity;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
@Component
public class User {
@Value("11")
private Integer id;
@Value("zz")
private String name;
@Resource
private Role role;
public Role getRole() {
return role;
}
public Integer getId() {
return id;
}
public String getName() {
return name;
}
}
package cn.kgc.entity;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class Role {
private Integer rId;
@Value("李四")
private String rName;
public Integer getrId() {
return rId;
}
public String getrName() {
return rName;
}
}
<?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">
<!--声明组件扫描器-->
<context:component-scan base-package="cn.kgc.entity"/>
</beans>
public class TestSpring {
@Test
public void testdemo001(){
String conf = "applicationContext.xml";
ClassPathXmlApplicationContext ac =
new ClassPathXmlApplicationContext(conf);
User myUser = (User) ac.getBean("user");
System.out.println(myUser.getId()+" "+myUser.getName()+" "+myUser.getRole().getrName() );
}
}
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.6.RELEASE</version>
</dependency>
package cn.kgc.entity;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
@Component
public class User {
@Value("11")
private Integer id;
@Value("zz")
private String name;
@Resource
private Role role33;
public Role getRole33() {
return role33;
}
public Integer getId() {
return id;
}
public String getName() {
return name;
}
}
package cn.kgc.entity;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class Role {
private Integer rId;
@Value("李四")
private String rName;
public Integer getrId() {
return rId;
}
public String getrName() {
return rName;
}
}
<?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">
<!--声明组件扫描器-->
<context:component-scan base-package="cn.kgc.entity"/>
</beans>
package cn.kgc.test;
import cn.kgc.entity.User;
import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestSpring {
@Test
public void testdemo001(){
String conf = "applicationContext.xml";
ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext(conf);
User myUser = (User) ac.getBean("user");
System.out.println(myUser.getId()+" "+myUser.getName()+" "+myUser.getRole33().getrName() );
}
}
@Component和@Repository,@Service,@Controller的异同
同:都可以创建对象
异:@Repository,@Service,@Controller都有自己的分层角色.
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