java 包名和类名同jar里面的一样 java同包下相同的类名

今天闲的蛋疼，做了一下spring自动注入的例子：

看看spring自动注入的是否可以区别出不同包下相同名字的Java类，答案是不能，spring居然这么渣。

整体结构图如下：

1：首先建立两个同名的java类和接口

com.a包下面有一个IAutoInject接口和实现类AutoInject，同理com.b包下面也有相同的接口和实现类。

同时加上spring声明bean的注解，@component或者@service或者@repository都可以，这里我用@component

代码如下：

[java]  view plain  copy

 

1. package com.a;  
2.   
3. public interface IAutoInject {  
4. public void print();  
5. }

[java]  view plain  copy

 

1. package com.a;  
2.   
3. import org.springframework.stereotype.Component;  
4.   
5. @Component  
6. public class AutoInject implements IAutoInject{  
7.   
8. public void print() {  
9. // TODO Auto-generated method stub  
10. "打印a中的方法");  
11.     }  
12.   
13. }

[java]  view plain  copy

 

1. package com.b;  
2.   
3. public interface IAutoInject {  
4. public void print();  
5. }

[java]  view plain  copy

 

1. package com.b;  
2.   
3. import org.springframework.stereotype.Component;  
4.   
5. @Component  
6. public class AutoInject implements IAutoInject{  
7.   
8. public void print() {  
9. // TODO Auto-generated method stub  
10. "打印b中的方法");  
11.     }  
12.   
13. }

Spring配置文件如下：

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1. <?xml version="1.0" encoding="UTF-8"?>  
2. <beans xmlns="http://www.springframework.org/schema/beans"  
3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"  
4. xmlns:context="http://www.springframework.org/schema/context"  
5. xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc"  
6. xmlns:task="http://www.springframework.org/schema/task"  
7. xsi:schemaLocation="http://www.springframework.org/schema/mvc   
8.     http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd    
9.     http://www.springframework.org/schema/beans   
10.     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd    
11.     http://www.springframework.org/schema/aop  
12.     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd  
13.     http://www.springframework.org/schema/context   
14.     http://www.springframework.org/schema/context/spring-context-3.0.xsd  
15.     http://www.springframework.org/schema/task   
16.     http://www.springframework.org/schema/task/spring-task-3.1.xsd  
17.     http://www.springframework.org/schema/tx   
18. >  
19.   
20. <!-- 自动扫描的包名 -->  
21. <context:component-scan base-package="com"></context:component-scan>  
22. <!-- 默认的注解映射的支持 -->  
23. <mvc:annotation-driven />  
24.   
25.   
26. </beans>

最后写一个测试类：

[java]  view plain  copy

 

1. package com.test;  
2. import javax.annotation.Resource;  
3. import org.junit.Test;  
4. import org.junit.runner.RunWith;  
5. import org.springframework.beans.factory.annotation.Autowired;  
6. import org.springframework.test.context.ContextConfiguration;  
7. import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;  
8. import org.springframework.test.context.transaction.TransactionConfiguration;  
9. import org.springframework.transaction.annotation.Transactional;  
10. import com.a.IAutoInject;  
11.   
12. //@Transactional  
13. //@TransactionConfiguration(transactionManager = "txManager", defaultRollback = true)  
14. @RunWith(SpringJUnit4ClassRunner.class)  
15. @ContextConfiguration(locations = { "classpath:applicationContext.xml" })  
16. public class MainTest {  
17. @Resource  
18. private IAutoInject autoInjecta;  
19. @Resource  
20. private com.b.IAutoInject autoInjectb;  
21. @Test  
22. public void test(){  
23.         autoInjecta.print();  
24.         autoInjectb.print();  
25.     }  
26. }

最后报错：

[java]  view plain  copy

 

1. <span style="background-color: rgb(102, 102, 102);">java.lang.IllegalStateException: Failed to load ApplicationContext</span>  
2. 103)  
3. 122)  
4. 109)  
5. 75)  
6. 321)  
7. 211)  
8. 1.runReflectiveCall(SpringJUnit4ClassRunner.java:288)  
9. 15)  
10. 284)  
11. 231)  
12. 88)  
13. 3.run(ParentRunner.java:193)  
14. 1.schedule(ParentRunner.java:52)  
15. 191)  
16. 000(ParentRunner.java:42)  
17. 2.evaluate(ParentRunner.java:184)  
18. 61)  
19. 71)  
20. 236)  
21. 174)  
22. 50)  
23. 38)  
24. 467)  
25. 683)  
26. 390)  
27. 197)  
28. <span style="background-color: rgb(102, 102, 102);">Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [applicationContext.xml]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'autoInject' for bean class [com.b.AutoInject] conflicts with existing, non-compatible bean definition of same name and class [com.a.AutoInject]</span>  
29. 413)  
30. 335)  
31. 303)  
32. 174)  
33. 209)  
34. 180)  
35. 243)  
36. 233)  
37. 117)  
38. 60)  
39. 102)  
40. 246)  
41. 69)  
42. 95)  
43. 25 more

看看上面深颜色的报错 ，可以看出

[java]  view plain  copy

 

1. Annotation-specified bean name 'autoInject' for bean class [com.b.AutoInject] conflicts with existing, non-compatible bean definition of same name and class [com.a.AutoInject]

[java]  view plain  copy

 

1. [com.b.AutoInject]

[java]  view plain  copy

 

1. 与  

[java]  view plain  copy

 

1. [com.a.AutoInject]  

[java]  view plain  copy

 

1. 冲突了！  

[java]  view plain  copy

 

1. 老老实实改成：  

[java]  view plain  copy

 

1. @Component(value="a")

[java]  view plain  copy

 

1. @Component(value="b")

[java]  view plain  copy

 

1. 使用的时候改成：  

[java]  view plain  copy

 

1. public class MainTest {  
2. @Resource(name="a")  
3. private IAutoInject autoInjecta;  
4. @Resource(name="b")  
5. private com.b.IAutoInject autoInjectb;  
6. @Test  
7. public void test(){  
8.         autoInjecta.print();  
9.         autoInjectb.print();  
10.     }  
11. }

0 踩

今天闲的蛋疼，做了一下spring自动注入的例子：

看看spring自动注入的是否可以区别出不同包下相同名字的Java类，答案是不能，spring居然这么渣。

整体结构图如下：

1：首先建立两个同名的java类和接口

com.a包下面有一个IAutoInject接口和实现类AutoInject，同理com.b包下面也有相同的接口和实现类。

同时加上spring声明bean的注解，@component或者@service或者@repository都可以，这里我用@component

代码如下：

[java]  view plain  copy

 

1. package com.a;  
2.   
3. public interface IAutoInject {  
4. public void print();  
5. }

[java]  view plain  copy

 

1. package com.a;  
2.   
3. import org.springframework.stereotype.Component;  
4.   
5. @Component  
6. public class AutoInject implements IAutoInject{  
7.   
8. public void print() {  
9. // TODO Auto-generated method stub  
10. "打印a中的方法");  
11.     }  
12.   
13. }

[java]  view plain  copy

 

1. package com.b;  
2.   
3. public interface IAutoInject {  
4. public void print();  
5. }

[java]  view plain  copy

 

 
  
1. package com.b;  
2.   
3. import org.springframework.stereotype.Component;  
4.   
5. @Component  
6. public class AutoInject implements IAutoInject{  
7.   
8. public void print() {  
9. // TODO Auto-generated method stub  
10. "打印b中的方法");  
11.     }  
12.   
13. }

Spring配置文件如下：

[html]  view plain  copy

 

1. <?xml version="1.0" encoding="UTF-8"?>  
2. <beans xmlns="http://www.springframework.org/schema/beans"  
3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"  
4. xmlns:context="http://www.springframework.org/schema/context"  
5. xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc"  
6. xmlns:task="http://www.springframework.org/schema/task"  
7. xsi:schemaLocation="http://www.springframework.org/schema/mvc   
8.     http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd    
9.     http://www.springframework.org/schema/beans   
10.     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd    
11.     http://www.springframework.org/schema/aop  
12.     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd  
13.     http://www.springframework.org/schema/context   
14.     http://www.springframework.org/schema/context/spring-context-3.0.xsd  
15.     http://www.springframework.org/schema/task   
16.     http://www.springframework.org/schema/task/spring-task-3.1.xsd  
17.     http://www.springframework.org/schema/tx   
18. >  
19.   
20. <!-- 自动扫描的包名 -->  
21. <context:component-scan base-package="com"></context:component-scan>  
22. <!-- 默认的注解映射的支持 -->  
23. <mvc:annotation-driven />  
24.   
25.   
26. </beans>

最后写一个测试类：

[java]  view plain  copy

 

1. package com.test;  
2. import javax.annotation.Resource;  
3. import org.junit.Test;  
4. import org.junit.runner.RunWith;  
5. import org.springframework.beans.factory.annotation.Autowired;  
6. import org.springframework.test.context.ContextConfiguration;  
7. import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;  
8. import org.springframework.test.context.transaction.TransactionConfiguration;  
9. import org.springframework.transaction.annotation.Transactional;  
10. import com.a.IAutoInject;  
11.   
12. //@Transactional  
13. //@TransactionConfiguration(transactionManager = "txManager", defaultRollback = true)  
14. @RunWith(SpringJUnit4ClassRunner.class)  
15. @ContextConfiguration(locations = { "classpath:applicationContext.xml" })  
16. public class MainTest {  
17. @Resource  
18. private IAutoInject autoInjecta;  
19. @Resource  
20. private com.b.IAutoInject autoInjectb;  
21. @Test  
22. public void test(){  
23.         autoInjecta.print();  
24.         autoInjectb.print();  
25.     }  
26. }

最后报错：

[java]  view plain  copy

 

1. <span style="background-color: rgb(102, 102, 102);">java.lang.IllegalStateException: Failed to load ApplicationContext</span>  
2. 103)  
3. 122)  
4. 109)  
5. 75)  
6. 321)  
7. 211)  
8. 1.runReflectiveCall(SpringJUnit4ClassRunner.java:288)  
9. 15)  
10. 284)  
11. 231)  
12. 88)  
13. 3.run(ParentRunner.java:193)  
14. 1.schedule(ParentRunner.java:52)  
15. 191)  
16. 000(ParentRunner.java:42)  
17. 2.evaluate(ParentRunner.java:184)  
18. 61)  
19. 71)  
20. 236)  
21. 174)  
22. 50)  
23. 38)  
24. 467)  
25. 683)  
26. 390)  
27. 197)  
28. <span style="background-color: rgb(102, 102, 102);">Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [applicationContext.xml]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'autoInject' for bean class [com.b.AutoInject] conflicts with existing, non-compatible bean definition of same name and class [com.a.AutoInject]</span>  
29. 413)  
30. 335)  
31. 303)  
32. 174)  
33. 209)  
34. 180)  
35. 243)  
36. 233)  
37. 117)  
38. 60)  
39. 102)  
40. 246)  
41. 69)  
42. 95)  
43. 25 more

看看上面深颜色的报错 ，可以看出

[java]  view plain  copy

 

1. Annotation-specified bean name 'autoInject' for bean class [com.b.AutoInject] conflicts with existing, non-compatible bean definition of same name and class [com.a.AutoInject]

[java]  view plain  copy

 

1. [com.b.AutoInject]

[java]  view plain  copy

 

1. 与  

[java]  view plain  copy

 

1. [com.a.AutoInject]  

[java]  view plain  copy

 

1. 冲突了！  

[java]  view plain  copy

 

1. 老老实实改成：  

[java]  view plain  copy

 

1. @Component(value="a")  

[java]  view plain  copy

 

1. @Component(value="b")

[java]  view plain  copy

 

1. 使用的时候改成：  

[java]  view plain  copy

 

1. public class MainTest {  
2. @Resource(name="a")  
3. private IAutoInject autoInjecta;  
4. @Resource(name="b")  
5. private com.b.IAutoInject autoInjectb;  
6. @Test  
7. public void test(){  
8.         autoInjecta.print();  
9.         autoInjectb.print();  
10.     }  
11. }