示例:demo7
package com.jt.demo7_anno;
public interface Pet {
void hello();
}
package com.jt.demo7_anno;
import org.springframework.stereotype.Component;
@Component
public class Pig implements Pet{
@Override
public void hello() {
System.out.println("扮猪吃老虎!");
}
}
package com.jt.demo7_anno;
import org.springframework.stereotype.Component;
@Component
public class Tiger implements Pet{
@Override
public void hello() {
System.out.println("八分饱冲击!!!");
}
}
package com.jt.demo7_anno;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
@Component
public class User {
/*实现类有多个的前提下,会有Error报错
* 报错信息为:expected single matching bean but found 2: pig,tiger
* 一个注入信息中有多个实现类*/
@Autowired
@Qualifier(value = "pig")
//@Qualifier必须和@Autowired联用,并且需要执行value的名称,就是spring中的key
//准则:一般条件下,Spring都是单实现!!!
private Pet pet;
public void hello(){
pet.hello();
}
}
package com.jt.demo7_anno;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan("com.jt.demo7_anno")
public class SpringConfig {
}
package com.jt.demo7_anno;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class TestUser {
public static void main(String[] args) {
ApplicationContext context =
new AnnotationConfigApplicationContext(SpringConfig.class);
User user = context.getBean(User.class);
user.hello();
}
}
示例:demo8
package com.jt.demo8;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
@Component
//当spring容器启动时,加载指定的配置文件,将数据保存到容器中
@PropertySource(value = "classpath:/dept.properties",encoding = "UTF-8")
public class Dept {
//取值方式:${pro中的key}
@Value("${dept.id}")
private Integer id;
@Value("${dept.name}")
private String name;
// @Value("101") //@Value注解可以为简单属性赋值
// private Integer id;
// @Value("财务部")
// private String name;
public void hello(){
System.out.println("获取数据:"+id+":"+name);
}
}
package com.jt.demo8;
//本类为demo8包的配置类
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan("com.jt.demo8")
public class SpringConfig {
}
package com.jt.demo8;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class TestDept {
public static void main(String[] args) {
ApplicationContext context =
new AnnotationConfigApplicationContext(SpringConfig.class);
Dept dept = context.getBean(Dept.class);
dept.hello();
}
}
示例:demo9
package com.jt.demo9.pojo;
import java.io.Serializable;
/*1.属性都是私有的,方法是公共的
* 2.要求对象序列化 作用:1.保证数据按照正确的格式输出
* 2.在多线程条件下,共享数据必须序列化
* 3.POJO的对象一般都是用来实现数据的传递的*/
public class User implements Serializable {
private Integer id;
private String name;
private Integer age;
private String sex;
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;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
}
package com.jt.demo9.mapper;
import com.jt.demo9.pojo.User;
public interface UserMapper {
void addUser(User user);
}
package com.jt.demo9.mapper;
import com.jt.demo9.pojo.User;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
@Component //Spring管理 key:userMapperIml value:反射机制
@Repository
public class UserMapperImpl implements UserMapper{
@Override
public void addUser(User user) {
System.out.println("完成用户的入库操作:"+user.getName());
}
}
package com.jt.demo9.service;
import com.jt.demo9.pojo.User;
public interface UserService {
void addUser(User user);
}
package com.jt.demo9.service;
import com.jt.demo9.mapper.UserMapper;
import com.jt.demo9.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UserServiceIml implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public void addUser(User user) {
userMapper.addUser(user);
}
}
package com.jt.demo9.controller;
import com.jt.demo9.pojo.User;
import com.jt.demo9.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;
@Controller
public class UserController {
@Autowired
private UserService userService;
public void addUser(){
User user = new User();
user.setId(101);
user.setName("春节快乐");
user.setAge(30);
user.setSex("傍地走");
userService.addUser(user);
}
}
package com.jt.demo9.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan("com.jt.demo9")
public class SpringConfig {
}
package com.jt.demo9;
import com.jt.demo9.config.SpringConfig;
import com.jt.demo9.controller.UserController;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class TestMVC {
public static void main(String[] args) {
ApplicationContext context =
new AnnotationConfigApplicationContext(SpringConfig.class);
UserController user = context.getBean(UserController.class);
user.addUser();
}
}
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