spring框架注解实例记录

怼烎@ 2024-04-17 15:41 85阅读 0赞

### 一、bean管理注解 ###

1.创建配置文件，引入约束（用红线标注的两条就是我们注解需要用到的约束和扫描注解的配置引入，其中扫描注解里面的base-package值的是你所要约束的包名）：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70][]

![201908280941171.png][]

2.新建各种测试类

![20190828094612561.png][]

User类：

![20190828094825892.png][]

test类：

![20190828094845417.png][]

结果：

![20190828094916359.png][]

### 注入属性注解： ###

1.注入属性的第一个注解（@Autowired）：

Add类：

![2019082810031876.png][]

User类：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 1][]

Test类：

![20190828100433685.png][]

结果：

![20190828100508624.png][]

从输出结果我们可以看到成功在User类中引入了Add对象。

### 注入属性的第二个注解： ###

其他内容与第一种致，User有些许变化：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 2][]

得到与第一种结果一致：  
![20190828101042111.png][]

### 二、Aop ###

![2019082810174360.png][]

### 配置文件方式： ###

引入xml约束（前置约束）和基本配置：

![20190828101651775.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 3][]

在配置切入点的expression属性是引入一个execution表达式，其中第一个\*表示任意格式的修饰符，具体解释：

![20190828102107567.png][]

Book类：  
![20190828102336356.png][]

MyBook类：

![20190828102358446.png][]

Test类：

![20190828102414900.png][]

结果：

![20190828102439294.png][]

xml约束（后置约束）：

注意：未改动的展示的与第一种一致

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 4][]

MyBook类：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 5][]

结果：

![20190828103021883.png][]

xml约束（环绕约束）：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 6][]

MyBook类：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 7][]

结果：

![20190828103704547.png][]

### 注解模式： ###

引入aop扫描：

![20190828103841513.png][]

MyBook类：

@Aspect
    @Component("myBook")
    public class MyBook {
        @Before(value = "execution(* aop.Book.bookAdd(..))")
        public static void changAdd(){
            System.out.println("增强方法.....前");
        }
    
        @After(value = "execution(* aop.Book.bookAdd(..))")
        public static void after(){
            System.out.println("增强方法后。。。");
        }
    
        @Around(value = "execution(* aop.Book.bookAdd(..))")
        public static void around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
            System.out.println("around.....前");
            proceedingJoinPoint.proceed();
            System.out.println("around.....后");
        }
    }

结果（这里执行顺序与之前不一样，具体原因自己可以查阅资料，这里只是解释注解的使用）：

![20190828104608656.png][]

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[201908280941171.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/b9c45945d00e4be298db4ab1fbfc64a1.png
[20190828094612561.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/c254d2acd0ee4c029abc5c752a8d6e28.png
[20190828094825892.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/c86ccac85a1040549d8c60c933899f52.png
[20190828094845417.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/8461470c6bcd4b4497010468a380de58.png
[20190828094916359.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/03ef235f9ee747f7bd300ec6e8e449c6.png
[2019082810031876.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/7e11cba6963647d3a76a4fe56e0e5df9.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/0d75a97acaae41569817cb37b67f6cea.png
[20190828100433685.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/fe14359269364084ae1db9d7f969e864.png
[20190828100508624.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/26fb03688e7e4a609bd8ac95bee47e20.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 2]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/289a7470ec3d478c87de12f5772d601c.png
[20190828101042111.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/6ed4dfe3962f4d7887b2af169ec577df.png
[2019082810174360.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/8b293b9ea699498bbebf49cfa6e56630.png
[20190828101651775.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/6bfbe724efb842f38060c1323854d6ac.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 3]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/2dfbf0dba7ac46c1b076f84896f53f63.png
[20190828102107567.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/1368717b7ede403ab4817b6d3ca6c091.png
[20190828102336356.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/c4f90d4d52e94ba78422d7ef74d2a990.png
[20190828102358446.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/c792fd6e8e7646a486517ac673a06e0e.png
[20190828102414900.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/bd3498a9ca0a411580e1918ba9589506.png
[20190828102439294.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/9c648bb11d3d49909589619e5353f306.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 4]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/d3e715536175416895313a2854b6b325.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 5]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/9e1d1cb30abd4ca5a7c8d06ea301c566.png
[20190828103021883.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/54ce6922a28b4e0eba3d1f73cac1ba6d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 6]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/b1ea97d08ac345aeaa4c5eb32cbdc10f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NobGVpXw_size_16_color_FFFFFF_t_70 7]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/a7461a1c15cc43ba814008d2754d807f.png
[20190828103704547.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/b11186dc6d1f4c54905131587300ab2b.png
[20190828103841513.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/be8557a2522d485eabf4ce5e070f571a.png
[20190828104608656.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/257517e305ef4492a6ca114fcad50389.png