多次使用@Autowired [英] using @Autowired many times

问题描述

我已经构建了Spring MVC 4.0应用程序。

我的设置如下所示：

控制器>>服务>> DAO

在控制器级别，我使用了大约4到5个不同的 @Autowired 像这样的变量

  @Autowired 
私人ClientService clientService; 
 @Autowired 
 private CommentService commentService; 
 @Autowired 
私人SearchService searchService; 
  

在服务等级I Autowire中还有几个DAO

  @Autowired 
 SearchDAO searchDAO; 
 
 @Autowired 
私人ActivityDAO activityDAO; 
 
 @Autowired 
 private UserService userService; 
  

我有大约10个不同的控制器，其中大多数控制器都是I @Autowire 相同的服务，所以我的问题是这个好吗？

可以使用 @Autowire 多少次我需要或会带来太多的内存使用量？它会对我的应用程序有一些其他影响吗？

我使用Spring 4.0 + hibernate JPA

解决方案 @Autowired 。

Autowired在Spring上下文中查找bean并分配给变量。它只是引用Service / Dao bean的同一个对象。它不会造成重复。

但是有太多的对象注入一个类是一个类做了很多事情的标志。尽可能检查将类重构为多个类的可能性。

I'm very new to spring, so I might ask silly question but anyway...

I have built Spring MVC 4.0 application.

my settings are like this:

Controller >> Service >> DAO

in controller level I use about 4 to 5 different @Autowired variables like this

@Autowired
private ClientService clientService;
@Autowired
private CommentService commentService;
@Autowired
private SearchService searchService;

In Service level I Autowire also several DAOs

@Autowired
SearchDAO searchDAO;

@Autowired
private ActivityDAO activityDAO;

@Autowired
private UserService userService;

I have about 10 different controllers and in majority of them I @Autowire same services, So my question is this ok or not?

Is is ok to use @Autowire as many times as I need or will bring too much memory usage? Will it have some other effects on my application?

I use Spring 4.0 + hibernate JPA

解决方案

There is no problem with @Autowired.

Autowired finds the bean in Spring context and assign to the variable. It is just referencing to the same object of Service/Dao bean. It will not create duplicate.

But having so many objects injected to one class is a sign of one class doing a lot. Check possibility of refactoring the class into multiple classes wherever possible.

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