Spring五种autowire模式

在Spring中，有五种autowire模式：byName,byType,constructor,autodetect,no;
下面分别对其进行介绍
1 byName:这个很简单，直接按照名字进行查找
Java代码

   1. package com.jnotnull; 
   2.  
   3. public class HelloWorld { 
   4.     public String message = null; 
   5.  
   6.         public void init(){ 
   7.                this.message = "HelloWorld"; 
   8.         } 
   9.  
  10.     public String getMessage() { 
  11.         return message; 
  12.     } 
  13.  
  14.     public void setMessage(String message) { 
  15.         this.message = message; 
  16.     } 
  17.  
  18. } 

package com.jnotnull;

public class HelloWorld {
public String message = null;

        public void init(){
               this.message = "HelloWorld";
        }

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}

}


config.xml
Java代码

   1. <?xml version="1.0" encoding="UTF-8"?> 
   2. <!DOCTYPE beans Public "-//SPRING//DTD BEAN//EN" 
   3. "http://www.springframework.org/dtd/spring-beans.dtd"> 
   4. <beans> 
   5. <bean id ="HelloWorld" class="com.jnotnull.HelloWorld" autowire="byName"> 
   6. <property name ="message"> 
   7.  <value>HelloWorld</value> 
   8.  </property> 
   9.  <bean> 
  10. </beans> 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans Public "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id ="HelloWorld" class="com.jnotnull.HelloWorld" autowire="byName">
<property name ="message">
<value>HelloWorld</value>
</property>
<bean>
</beans>


2 byType：按照类型进行查找，如果没有找到匹配的，则什么也没有改变，同时可以通过设置dependency-check="objects"属性来在没有匹配到的情况下抛出这种错误。
Java代码

   1. package com.jnotnull; 
   2.  
   3. public class HelloWorld { 
   4.     public String message = null; 
   5.  
   6.         public void init(){ 
   7.                this.message = "HelloWorld"; 
   8.         } 
   9.  
  10.     public String getMessage() { 
  11.         return message; 
  12.     } 
  13.  
  14.     public void setMessage(String message) { 
  15.         this.message = message; 
  16.     } 
  17.  
  18. } 

package com.jnotnull;

public class HelloWorld {
public String message = null;

        public void init(){
               this.message = "HelloWorld";
        }

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}

}


config.xml
Java代码

   1. <?xml version="1.0" encoding="UTF-8"?> 
   2. <!DOCTYPE beans Public "-//SPRING//DTD BEAN//EN" 
   3. "http://www.springframework.org/dtd/spring-beans.dtd"> 
   4. <beans> 
   5. <bean id ="HelloWorld" class="com.jnotnull.HelloWorld" autowire="byType"> 
   6. <property name ="message"> 
   7.  <value>HelloWorld</value> 
   8.  </property> 
   9.  <bean> 
  10. </beans> 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans Public "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id ="HelloWorld" class="com.jnotnull.HelloWorld" autowire="byType">
<property name ="message">
<value>HelloWorld</value>
</property>
<bean>
</beans>



3 constructor：直接根据构造函数进行匹配
Java代码

   1. package com.jnotnull; 
   2.  
   3. public class HelloWorld { 
   4.     public String message = null; 
   5.  
   6.         public void init(){ 
   7.                this.message = "HelloWorld"; 
   8.         } 
   9.  
  10.     public String getMessage() { 
  11.         return message; 
  12.     } 
  13.  
  14.     public void setMessage(String message) { 
  15.         this.message = message; 
  16.     } 
  17.  
  18. } 

package com.jnotnull;

public class HelloWorld {
public String message = null;

        public void init(){
               this.message = "HelloWorld";
        }

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}

}


config.xml
Java代码

   1. <?xml version="1.0" encoding="UTF-8"?> 
   2. <!DOCTYPE beans Public "-//SPRING//DTD BEAN//EN" 
   3. "http://www.springframework.org/dtd/spring-beans.dtd"> 
   4. <beans> 
   5. <bean id ="HelloWorld" class="com.jnotnull.HelloWorld" autowire="constrator"> 
   6. <property name ="message"> 
   7.  <value>HelloWorld</value> 
   8.  </property> 
   9.  <bean> 
  10. </beans> 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans Public "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id ="HelloWorld" class="com.jnotnull.HelloWorld" autowire="constrator">
<property name ="message">
<value>HelloWorld</value>
</property>
<bean>
</beans>


4 autodetect：先按constructor匹配，再按byType匹配
Java代码

   1. package com.jnotnull; 
   2.  
   3. public class HelloWorld { 
   4.     public String message = null; 
   5.  
   6.         public void init(){ 
   7.                this.message = "HelloWorld"; 
   8.         } 
   9.  
  10.     public String getMessage() { 
  11.         return message; 
  12.     } 
  13.  
  14.     public void setMessage(String message) { 
  15.         this.message = message; 
  16.     } 
  17.  
  18. } 

package com.jnotnull;

public class HelloWorld {
public String message = null;

        public void init(){
               this.message = "HelloWorld";
        }

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}

}


config.xml
Java代码

   1. <?xml version="1.0" encoding="UTF-8"?> 
   2. <!DOCTYPE beans Public "-//SPRING//DTD BEAN//EN" 
   3. "http://www.springframework.org/dtd/spring-beans.dtd"> 
   4. <beans> 
   5. <bean id ="HelloWorld" class="com.jnotnull.HelloWorld" autowire="autodetect"> 
   6. <property name ="message"> 
   7.  <value>HelloWorld</value> 
   8.  </property> 
   9.  <bean> 
  10. </beans> 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans Public "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id ="HelloWorld" class="com.jnotnull.HelloWorld" autowire="autodetect">
<property name ="message">
<value>HelloWorld</value>
</property>
<bean>
</beans>



5 no：不用任何模式进行匹配，这个也是默认的匹配模式
Java代码

   1. package com.jnotnull; 
   2.  
   3. public class HelloWorld { 
   4.     public String message = null; 
   5.  
   6.         public void init(){ 
   7.                this.message = "HelloWorld"; 
   8.         } 
   9.  
  10.     public String getMessage() { 
  11.         return message; 
  12.     } 
  13.  
  14.     public void setMessage(String message) { 
  15.         this.message = message; 
  16.     } 
  17.  
  18. } 

package com.jnotnull;

public class HelloWorld {
public String message = null;

        public void init(){
               this.message = "HelloWorld";
        }

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}

}


config.xml
Java代码

   1. <?xml version="1.0" encoding="UTF-8"?> 
   2. <!DOCTYPE beans Public "-//SPRING//DTD BEAN//EN" 
   3. "http://www.springframework.org/dtd/spring-beans.dtd"> 
   4. <beans> 
   5. <bean id ="HelloWorld" class="com.jnotnull.HelloWorld" autowire="no"> 
   6. <property name ="message"> 
   7.  <value>HelloWorld</value> 
   8.  </property> 
   9.  <bean> 
  10. </beans> 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans Public "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id ="HelloWorld" class="com.jnotnull.HelloWorld" autowire="no">
<property name ="message">
<value>HelloWorld</value>
</property>
<bean>
</beans>