【Spring】Spring常用注解（下）

1. //使用@PropertySource读取外部配置文件中的k/v保存到运行的环境变量中;加载完外部的配置文件以后使用${}取出配置文件的值
2. @PropertySource(value={"classpath:/person.properties"})
3. @Configuration
4. public class MainConfigOfPropertyValues {
5. 
6. @Bean
7.    public Person person(){
8. return new Person();
9.    }
10. 
11. }

1. public class IOCTest_PropertyValue {
2.    AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfigOfPropertyValues.class);
3.    @Test
4.    public void test01(){
5.       printBeans(applicationContext);
6.       System.out.println("=============");
7. 
8.       Person person = (Person) applicationContext.getBean("person");
9.       System.out.println(person);
10. 
11. 
12.       ConfigurableEnvironment environment = applicationContext.getEnvironment();
13. String property = environment.getProperty("person.nickName");
14.       System.out.println(property);
15.       applicationContext.close();
16.    }
17. 
18.    private void printBeans(AnnotationConfigApplicationContext applicationContext){
19. String[] definitionNames = applicationContext.getBeanDefinitionNames();
20. for (String name : definitionNames) {
21.          System.out.println(name);
22.       }
23.    }
24. 
25. }

1. @Controller
2. public class BookController {
3. 
4. @Autowired
5. private BookService bookService;
6. 
7. }
8. @Service
9. public class BookService {
10. 
11. //@Qualifier("bookDao")
12. //@Autowired(required=false)
13. //@Resource(name="bookDao2")
14. @Inject
15. private BookDao bookDao;
16. 
17. public void print(){
18. System.out.println(bookDao);
19.    }
20. 
21. @Override
22. public String toString() {
23. return "BookService [bookDao=" + bookDao + "]";
24.    }
25. 
26. 
27. }
28. //名字默认是类名首字母小写
29. @Repository
30. public class BookDao {
31. 
32. private String lable = "1";
33. 
34. public String getLable() {
35. return lable;
36.    }
37. 
38. public void setLable(String lable) {
39. this.lable = lable;
40.    }
41. 
42. @Override
43. public String toString() {
44. return "BookDao [lable=" + lable + "]";
45.    }
46. 
47. 
48. 
49. }

1. public class IOCTest_Autowired {
2. 
3.    @Test
4.    public void test01(){
5.       AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConifgOfAutowired.class);
6. 
7.       BookService bookService = applicationContext.getBean(BookService.class);
8.       System.out.println(bookService);
9. 
10. //BookDao bean = applicationContext.getBean(BookDao.class);
11. //System.out.println(bean);
12. 
13.       Boss boss = applicationContext.getBean(Boss.class);
14.       System.out.println(boss);
15.       Car car = applicationContext.getBean(Car.class);
16.       System.out.println(car);
17. 
18.       Color color = applicationContext.getBean(Color.class);
19.       System.out.println(color);
20.       System.out.println(applicationContext);
21.       applicationContext.close();
22.    }
23. 
24. }

1. /**
2.  * Profile：
3.  *        Spring为我们提供的可以根据当前环境，动态的激活和切换一系列组件的功能；
4.  * 
5.  * 开发环境、测试环境、生产环境；
6.  * 数据源：(/A)(/B)(/C)；
7.  * 
8.  * 
9.  * @Profile：指定组件在哪个环境的情况下才能被注册到容器中，不指定，任何环境下都能注册这个组件
10.  * 
11.  * 1）、加了环境标识的bean，只有这个环境被激活的时候才能注册到容器中。默认是default环境
12.  * 2）、写在配置类上，只有是指定的环境的时候，整个配置类里面的所有配置才能开始生效
13.  * 3）、没有标注环境标识的bean在，任何环境下都是加载的；
14.  */
15. 
16. @PropertySource("classpath:/dbconfig.properties")
17. @Configuration
18. public class MainConfigOfProfile implements EmbeddedValueResolverAware{
19. 
20. @Value("${db.user}")
21. private String user;
22. 
23. private StringValueResolver valueResolver;
24. 
25. private String  driverClass;
26. 
27. 
28. @Bean
29. public Yellow yellow(){
30. return new Yellow();
31.    }
32. 
33. @Profile("test")
34. @Bean("testDataSource")
35. public DataSource dataSourceTest(@Value("${db.password}")String pwd) throws Exception{
36.       ComboPooledDataSource dataSource = new ComboPooledDataSource();
37.       dataSource.setUser(user);
38.       dataSource.setPassword(pwd);
39.       dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");
40.       dataSource.setDriverClass(driverClass);
41. return dataSource;
42.    }
43. 
44. 
45. @Profile("dev")
46. @Bean("devDataSource")
47. public DataSource dataSourceDev(@Value("${db.password}")String pwd) throws Exception{
48.       ComboPooledDataSource dataSource = new ComboPooledDataSource();
49.       dataSource.setUser(user);
50.       dataSource.setPassword(pwd);
51.       dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/ssm_crud");
52.       dataSource.setDriverClass(driverClass);
53. return dataSource;
54.    }
55. 
56. @Profile("prod")
57. @Bean("prodDataSource")
58. public DataSource dataSourceProd(@Value("${db.password}")String pwd) throws Exception{
59.       ComboPooledDataSource dataSource = new ComboPooledDataSource();
60.       dataSource.setUser(user);
61.       dataSource.setPassword(pwd);
62.       dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/scw_0515");
63. 
64.       dataSource.setDriverClass(driverClass);
65. return dataSource;
66.    }
67. 
68. @Override
69. public void setEmbeddedValueResolver(StringValueResolver resolver) {
70. // TODO Auto-generated method stub
71. this.valueResolver = resolver;
72.       driverClass = valueResolver.resolveStringValue("${db.driverClass}");
73.    }
74. 
75. }

1. db.user=root
2. db.password=123456
3. db.driverClass=com.mysql.jdbc.Driver