Spring_Autowiring collaborators
在Spring3.2.2中自动装配类型，分别为：no(default)(不采用自动装配)、byName，byType，constructor下面来分别介绍一下这些是如何自动装配的
Mode Explanation
no: (Default) No autowiring. Bean references must be defined via a ref element.
Changing the default setting is not recommended for larger deployments,
because specifying collaborators explicitly gives greater control and clarity.
To some extent, it documents the structure of a system.
byName:Autowiring by property name.
Spring looks for a bean with the same name as the property that needs to be autowired.
For example, if a bean definition is set to autowire by name,
and it contains a master property (that is, it has a setMaster(..) method),
Spring looks for a bean definition named master, and uses it to set the property.
byType:Allows a property to be autowired if exactly one bean of the property type exists in the container.
If more than one exists, a fatal exception is thrown,
which indicates that you may not use byType autowiring for that bean.
If there are no matching beans, nothing happens; the property is not set.
constructor：Analogous to byType, but applies to constructor arguments.
If there is not exactly one bean of the constructor argument type in the container, a fatal error is raised
案例分析：
1、创建CumputerBean类
[java]
package www.csdn.spring.autowire.bean;
public class CumputerBean {
// 电脑名称
private String name;
public void setName(String name) {
this.name = name;
}
}
[java]
package www.csdn.spring.autowire.bean;
public class CumputerBean {
// 电脑名称
private String name;
public void setName(String name) {
this.name = name;
}
}
package www.csdn.spring.autowire.bean;
public class CumputerBean {
// 电脑名称
private String name;
public void setName(String name) {
this.name = name;
}
}
2、创建DeptBean 类
[java]
package www.csdn.spring.autowire.bean;
public class DeptBean {
//部门名称
private String name;
public void setName(String name) {
this.name = name;
}
}
[java]
package www.csdn.spring.autowire.bean;
public class DeptBean {
//部门名称
private String name;
public void setName(String name) {
this.name = name;
}
}
package www.csdn.spring.autowire.bean;
public class DeptBean {
//部门名称
private String name;
public void setName(String name) {
this.name = name;
}
}3、创建EmployeeBean
[java]
package www.csdn.spring.autowire.bean;
public class EmployeeBean {
private DeptBean deptBean;
private CumputerBean cumputerBean;
public void setDeptBean(DeptBean deptBean) {
this.deptBean = deptBean;
}
public void setCumputerBean(CumputerBean cumputerBean) {
this.cumputerBean = cumputerBean;
}
@Override
public String toString() {
return "EmployeeBean [deptBean=" + deptBean + ", cumputerBean="
+ cumputerBean + "]";
}
}
[java]
package www.csdn.spring.autowire.bean;
public class EmployeeBean {
private DeptBean deptBean;
private CumputerBean cumputerBean;
public void setDeptBean(DeptBean deptBean) {
this.deptBean = deptBean;
}
public void setCumputerBean(CumputerBean cumputerBean) {
this.cumputerBean = cumputerBean;
}
@Override
public String toString() {
return "EmployeeBean [deptBean=" + deptBean + ", cumputerBean="
+ cumputerBean + "]";
}
}
package www.csdn.spring.autowire.bean;
public class EmployeeBean {
private DeptBean deptBean;
private CumputerBean cumputerBean;
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