Spring ioc configuration snippet

IOC : Inversion of Control

DI :Dependency Injection

setter injection

Constructor injection

Reference injection

idref (可验证的)

inner bean

list

Set

Props

<bean id="collegeBean3" class="collection.props.example.CollegeBean">
    <property name="pros">
      <props>
        <prop key="roll">100</prop>
        <prop key="name">satya</prop>
      </props>
    </property>
  </bean>

Map

Null值

p-namespace (设置bean的field)

lazy initialization

autowiring by name

@Autowired
  public void setStudent(Student student) {
    this.student = student;
  }

autowiring by Type
不是唯一的bean会报错（No unique bean of type is defined）

autowiring by Name
不是唯一的bean会报错（No unique bean of type is defined）

      @Autowired
      public  College(Student student) {
        this.student = student;
      }

autowiring by autodetect

autowire-candidate

The autowire-candidate attribute is set in the <bean/> element and when it is set to false the container excludes that specific bean from autowiring.

<bean id="college5"
class="spring.exclude.autwiring.College" autowire-candidate="false">
<property name="registration" value="BL001" />
<property name="year" value="2001" />
</bean

@required

      @Required
      public void setStudent(Student student) {
        this.student = student;
      }

<context:annotation-config />

Property 'student' is required for bean 'college'

scope="singleton" （默认、单例）

scope="prototype" (多次实例化)

inherit

The support of inheritance is present in the Spring framework and common values or configuration is shared among beans. The child bean inherits the properties and configuration of the parent bean or base bean.

inherit override

dependency-check

It check for all bean's dependencies, that is expressed in its properties are satisfied or not.

Spring List Factory
Ths ListFactoryBean is a simple factory for shared List instance. The list element is defined in the xml bean definitions. The setSourceList method set the source List which is written in xml list element. The SetTargetListClass method set the class to use target List.

<bean id="week" class="list.factory.example.Week">
    <property name="days">
      <bean class="org.springframework.beans.factory.config.ListFactoryBean">
        <property name="targetListClass">
          <value>java.util.ArrayList</value>
        </property>
        <property name="sourceList">
          <list>
            <value>Monday</value>
            <value>Tuesday</value>
            <value>Wednesday</value>
            <value>Thursday</value>
            <value>Friday</value>
            <value>Saturday</value>
            <value>Sunday</value>
          </list>
        </property>
      </bean>
    </property>
  </bean>

Spring Set Factory
继承自AbstractFactoryBean

<bean id="week" class="set.factory.example.Week">
    <property name="days">
      <bean class="org.springframework.beans.factory.config.SetFactoryBean">
        <property name="targetSetClass">
          <value>java.util.HashSet</value>
        </property>
        <property name="sourceSet">
          <list>
            <value>Monday</value>
            <value>Tuesday</value>
            <value>Wednesday</value>
            <value>Thursday</value>
            <value>Friday</value>
            <value>Saturday</value>
            <value>Sunday</value>
          </list>
        </property>
      </bean>
    </property>
  </bean>

Spring Map Factory

  <bean id="week2" class="map.factory.example.Week">
    <property name="days2">
      <bean class="org.springframework.beans.factory.config.MapFactoryBean">
        <property name="targetMapClass">
          <value>java.util.HashMap</value>
        </property>
        <property name="sourceMap">
          <map>
        <entry key="Key1" value="Sunday" />
        <entry key="Key2" value="Monday" />
        <entry key="Key3" value="Tuesday" />
        <entry key="Key4" value="Wednesday" />
        <entry key="Key5" value="Thursday" />
        <entry key="Key6" value="Friday" />
        <entry key="Key7" value="Saturday" />
      </map>
        </property>
      </bean>
    </property>
  </bean>

Spring Date Property

Properties editors used to convert from String values to object types such as java.util.Properties.

package spring.date.property;

import java.util.Date;

public class Employee {

        private Date joiningDate;
        private String name;

        public Date getJoiningDate() {
                return joiningDate;
        }

        public void setJoiningDate(Date joiningDate) {
                this.joiningDate = joiningDate;
        }

        public String getName() {
                return name;
        }

        public void setName(String name) {
                this.name = name;
        }

}

CustomEditorConfigurer

Passing a date format in the bean property is not allowed and in order to do so you need to register the CustomDateEditor in CustomEditorConfigurer first so that it will convert the bean properties which type is java.util.Date

@Component、@Repository、@Service、@Controller

@Component
public class StudentService {
        @Autowired
        StudentDAO studentDAO;

        @Override
        public String toString() {
                return "StudentService [studentDAO=" + studentDAO + "]";
        }
}

<context:component-scan base-package="ioc.component">
  <context:exclude-filter type="regex"
              expression="ioc\.component\.*Student.*" />
<context:exclude-filter type="annotation"
                 expression="org.springframework.stereotype.Service" />
</context:component-scan>

DisposableBean InitializingBean marker interface

public class StudentService implements InitializingBean, DisposableBean {
        String message;

        public String getMessage() {
                return message;
        }

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

        public void afterPropertiesSet() throws Exception {
                System.out.println(" After properties has been set : " + message);
        }

        public void destroy() throws Exception {
                System.out.println("Cleaned everything!!");
        }

}

org.springframework.context.ApplicationContextAware实现接口自动装配

public class StudentBean implements ApplicationContextAware {
        private ApplicationContext context;

        public void setApplicationContext(ApplicationContext applicationContext)
                        throws BeansException {
                context = applicationContext;
                System.out.println(applicationContext);
        }

}

org.springframework.beans.factory.config.BeanPostProcessor 修改bean

class StudentBean implements BeanPostProcessor {

        public Object postProcessBeforeInitialization(Object bean, String beanName)
                        throws BeansException {
                return bean;
        }

        public Object postProcessAfterInitialization(Object bean, String beanName)
                        throws BeansException {

                System.out.println("Initialized Bean : " + beanName);
                return bean;
        }
}

org.springframework.beans.factory.BeanNameAware 自动装配配置文件里该bean的ID

class StudentBean implements BeanNameAware {
        private String name;

        public void setBeanName(String name) {
                this.name = name;
        }
}

@PreDestroy @PostConstruct

      @PostConstruct
      public void initIt() throws Exception {
              System.out.println("After properties has been set : " + test);
      }

      @PreDestroy
      public void cleanUp() throws Exception {
              System.out.println("Cleaned Everyting");
      }

　　　 ConfigurableApplicationContext context；

context.close();

　　　　<context:annotation-config/>

posted @ 2011-08-08 08:23 倚楼无语F5 阅读(451) 评论(0) 收藏举报

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