依赖注入-注解形式
构造方法注入
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| public class MovieRecommender {
private final CustomerPreferenceDao customerPreferenceDao;
@Autowired
public MovieRecommender(CustomerPreferenceDao customerPreferenceDao) {
this.customerPreferenceDao = customerPreferenceDao;
}
}
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set 方法注入
单参数
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| public class SimpleMovieLister {
private MovieFinder movieFinder;
@Autowired
public void setMovieFinder(MovieFinder movieFinder) {
this.movieFinder = movieFinder;
}
}
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多参数
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| public class MovieRecommender {
private MovieCatalog movieCatalog;
private CustomerPreferenceDao customerPreferenceDao;
@Autowired
public void prepare(MovieCatalog movieCatalog,
CustomerPreferenceDao customerPreferenceDao) {
this.movieCatalog = movieCatalog;
this.customerPreferenceDao = customerPreferenceDao;
}
}
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字段注入
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| public class MovieRecommender {
private final CustomerPreferenceDao customerPreferenceDao;
@Autowired
private MovieCatalog movieCatalog;
@Autowired
public MovieRecommender(CustomerPreferenceDao customerPreferenceDao) {
this.customerPreferenceDao = customerPreferenceDao;
}
}
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集合注入
注入指定类型的所有实例 到 集合变量中 。
如果 需要 将 所有实例按指定顺序排序，则可以使用 @Order 或 @Priority 指定顺序。
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| public class MovieRecommender {
@Autowired
private MovieCatalog[] movieCatalogs;
}
public class MovieRecommender {
private Set<MovieCatalog> movieCatalogs;
@Autowired
public void setMovieCatalogs(Set<MovieCatalog> movieCatalogs) {
this.movieCatalogs = movieCatalogs;
}
}
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map注入
map注入形式:
Map<String,SomeType>
以 string 类型为 key 的map: spring 会将 ApplicationContext 中的对应的 SomeType 注入 该map中。
key: 对应 bean 的 name
value: 对应 bean 的 instance
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| public class MovieRecommender {
private Map<String, MovieCatalog> movieCatalogs;
@Autowired
public void setMovieCatalogs(Map<String, MovieCatalog> movieCatalogs) {
this.movieCatalogs = movieCatalogs;
}
}
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