一:@Autowired(按类型注入)1.1通过 @Autowired的使用来消除 set ,get方法。 @Autowired private Dao dao; 这样就可以删除set ,get方法和spring中的相关配制了。 <bean id="service" class="com.Servcie"> <property name="dao" ref="dao"> </bean> <bean id="dao" class="com.dao"/>
1.2通过@Autowired属的Setter方法给父类中的属性注入值。 @Autowired public void setDataSource(DataSource ds){ super.setDataSource(ds); }
1.3当不能确定 Spring 容器中一定拥有某个类的 Bean 时,可以在需要自动注入该类 Bean 的地方可以使用 @Autowired(required = false) ,这等于告诉 Spring:在找不到匹配 Bean 时 也不报错。@Autowired(required = false)二:@Resource(按名称注入)1.1 @Resource(name="dao") private Dao dao; @Repository("dao") Public class Dao{}三:@Controller
作用:Controllers provide access to the application behavior that you typically define through a service interface.
Controllers interpret user input and transform it into a model that is represented to the user by the view.
Spring implements a controller in a very abstract way, which enables you to create a wide variety of controllers.
控制器提供访问你通过service定义的接口的应用,控制器解释用户输入和转换为由视图表示给用户的模型;spring实现了一个控制器非常抽象的方式,他可以使你可以创造一个非常宽广的控制器。1.1 EG: @Controller("com.LogAction") //标识控制器bean id
2.2 @Controller 和 @Component 的区别是什么呢?Spring provides further stereotype annotations: @Component, @Service, and @Controller.
@Component is a generic stereotype for any Spring-managed component.
@Repository, @Service, and @Controller are specializations of @Component for more specific use cases,for example, in the persistence, service, and presentation layers, respectively.
Therefore, you can annotate your component classes with @Component, but by annotating them with @Repository, @Service, or @Controller instead, your classes are more properly suited for processing by tools or associating with aspects.
For example, these stereotype annotations make ideal targets for pointcuts.
It is also possible that @Repository, @Service, and @Controller may carry additional semantics in future releases of the Spring Framework.
Thus, if you are choosing between using @Component or @Service for your service layer, @Service is clearly the better choice. Similarly, as stated above, @Repository is already supported as a marker for automatic exception translation in your persistence layer.
意思就是说: spring 提供了很多样板注释: @Component, @Service, 和 @Controller.而@Component是任何spring管理的组件的一个通用的构造件;比如,分别在在持久层、service和、表示层。
因此,你可以注入你的组件类@Component,但是 注入@Repository, @Service, 和 @Controller 来代替注入@Component的话,你的类会更适合通过工具或者切面的结合的处理。例如,这些刻板印象注解是切入点的理想目标。
@Repository,@Service和@Controller也可能在Spring Framework的未来版本中携带额外的语义。因此,如果您在为服务层使用@Component或@Service之间进行选择,@Service显然是更好的选择。同样,如上所述,已经支持@Repository作为持久层自动异常转换的标记。
四:@RequestMapping1.1EG: @RequestMapping("log/login.htm", method="RequestMethod.POST", headers="Content-Type=application/json", consumes={"application/json"}, produces={"application/json"}) 参数有(value={"",""},method={"RequestMethod.GET",""},params={"submitFlag=create",""}...) value:请求的url,params :请求的参数中含有该值;在@RequestMapping 中 params 的参数组合使用是 且的意思headers:请求参数 Content-Type=application/json 表示客户端发送的文件内容类型,从而服务器按这种类型来解析; Accept=application/xml 表示客户端只接收该类型内容从而服务器发送该类型数据headers="Content-Type=application/json" 对应--> consumes="application/json"headers="Accept=application/json" 对应--> produces="application/json"consumes:表示服务器只能消费的数据类型;produces:标示服务器只负责生产的数据
@RequestMapping(value = "/produces", produces = "application/json"):表示将功能处理方法将生产json格式的数据,此时根据请求头中的Accept进行匹配,如请求头“Accept:application/json”时即可匹配;@RequestMapping(value = "/produces", produces = "application/xml"):表示将功能处理方法将生产xml格式的数据,此时根据请求头中的Accept进行匹配,如请求头“Accept:application/xml”时即可匹配。此种方式相对使用@RequestMapping的“headers = "Accept=application/json"”更能表明你的目的。服务器控制器代码详解cn.javass.chapter6.web.controller.consumesproduces.ProducesController;客户端代码类似于之前的Content-Type中的客户端,详见ProducesController.java代码。当你有如下Accept头:①Accept:text/html,application/xml,application/json 将按照如下顺序进行produces的匹配 ①text/html ②application/xml ③application/json②Accept:application/xml;q=0.5,application/json;q=0.9,text/html 将按照如下顺序进行produces的匹配 ①text/html ②application/json ③application/xml q参数为媒体类型的质量因子,越大则优先权越高(从0到1)③Accept:*/*,text/*,text/html 将按照如下顺序进行produces的匹配 ①text/html ②text/* ③*/*
出处:
五:@Component = @Service or @Reponsitory1.1 当组件描述不明确时可以统一用@Component
六:@ModeAttribute
很值得注意:
An @ModelAttribute
on a method indicates the purpose of that method is to add one or more model attributes.
Such methods support the same argument types as @RequestMapping
methods but cannot be mapped directly to requests.
Instead @ModelAttribute
methods in a controller are invoked before @RequestMapping
methods, within the same controller.
(而是在同一个控制器中的@RequestMapping方法之前调用控制器中的@ModelAttribute方法。)一般在使用期间,如果需要全局用到的东西,我一般继承该Controller;
七:参数绑定注解
9、@DateTimeFormat(pattern ="yyyy-MM-dd") Date类型的参数,自动转换格式
@RequestParam (value="",required=false[默认true],defaultValue="zhang") 绑定单个参数 public void method(@RequestParam(value="username") String name){} --> ...htm?username=zzd 绑定多个参数 public void method(@RequestParam(value="role") String[] roles){} 或者 public void method(@RequestParam(value="role" ) List<String> roles) {} -->...htm?role=admin&role=test
@CookieValuepublic String test(@CookieValue(value="JSESSIONID", defaultValue="") String sessionId)
七:@Valid:
该注解就是告诉spring 这个参数需要确保满足校验条件限制;
<context:component-scan/> 扫描指定的包中的类上的注解,常用的注解有:
@Controller 声明Action组件@Service 声明Service组件 @Service("myMovieLister") @Repository 声明Dao组件@Component 泛指组件, 当不好归类时. @RequestMapping("/menu") 请求映射@Resource 用于注入,( j2ee提供的 ) 默认按名称装配,@Resource(name="beanName") @Autowired 用于注入,(srping提供的) 默认按类型装配
例如:
@Autowired pirvate CurryUserService curryUserService; @Autowired pirvate CurryUserService abc; //这两种都可以注入成功 而 @Resource(name = "curryUserService") private CurryUserService curryUserService; //注入成功 @Resource(name = "curryUserService") private CurryUserService abc; //注入失败,因为对象名和@Resource中的name值不一致@Transactional( rollbackFor={Exception.class}) 事务管理@ResponseBody@Scope("prototype") 设定bean的作用域
转载地址:https://www.cnblogs.com/leonkobe/p/3530872.html