1.　　三種實例化bean方法：

　　　　1）使用類構造器實例化

<bean id="personService" class="cn.itcast.service.imp.PersonServiceBean"></bean> package cn.itcast.service.imp;import cn.itcast.service.PersonService;public class PersonServiceBean implements PersonService {public void save(){System.out.println("我是save方法");} }

　　　　2）使用靜態工廠方法實例化，factory-method="createOrder"：代表靜態方法的方法名

<bean id="personService2" class="cn.itcast.service.imp.PersonServiceBeanFactory" factory-method="createOrder"></bean> package cn.itcast.service.imp;public class PersonServiceBeanFactory {public static PersonServiceBean createOrder(){return new PersonServiceBean();} }

　　　　3）使用實例工廠方法實例化，先配一個bean的工廠類，然后再配bean，應用上一步配置的工廠類

<bean id="personServiceFactory" class="cn.itcast.service.imp.PersonServiceBeanFactory"></bean> <bean id="personService3" factory-bean="personServiceFactory" factory-method="createOrder2"></bean> package cn.itcast.service.imp;public class PersonServiceBeanFactory {public static PersonServiceBean createOrder(){return new PersonServiceBean();}public PersonServiceBean createOrder2(){return new PersonServiceBean();} }

2.　　　　bean的作用域：

　　　　1）scope="singleton"（默認）每個Spring Ioc容器中一個bean定義只有一個實例對象，默認情況下會在容器啟動時初始化bean，但是我們可以指定bean節點的lazy-init="true"來延遲初始化bean，只有第一次獲取bean對象才初始化bean。如：

<bean id='personService' class='cn.itcast.service.imp.PersonServiceBean' lazy-init="true"></bean>

如果想對所有bean都應用延遲初始化，可以在根節點beans設置default-lazy-init="true"。

　　　　2）scope="prototype"每次從容器獲取bean都是一個新的對象

3.　　　　bean的初始化方法和銷毀方法：（先實例化再執行初始化方法，即先執行構造方法，再執行init方法)

<bean id='personService' class='cn.itcast.service.imp.PersonServiceBean' init-method="init" destroy-method="destory" ></bean>

　　　　調用destory方法用下面的對象：

AbstractApplicationContext ctr = new ClassPathXmlApplicationContext(new String[]{"beans.xml"}); ctr.close();

4.　　　　通過屬性set方法注入（在運行期，由外部容器動態的將依賴對象注入到組件中）

　　　　1）對象的注入

package cn.itcast.service.imp;import cn.itcast.dao.PersonDao; import cn.itcast.service.PersonService;public class PersonServiceBean implements PersonService {PersonDao personDao;public PersonDao getPersonDao() {return personDao;}public void setPersonDao(PersonDao personDao) {this.personDao = personDao;}public void save(){personDao.save();}} <bean id="personDao" class="cn.itcast.dao.imp.PersonDaoImp"></bean> <bean id="personService" class="cn.itcast.service.imp.PersonServiceBean"><property name="personDao" ref="personDao"></property> </bean>

?或者

<bean id="personService" class="cn.itcast.service.imp.PersonServiceBean"><property name="personDao"><bean class="cn.itcast.dao.imp.PersonDaoImp"></bean></property> </bean>

　　　　2）基本數據類型的注入，<property name="name" value="itcast"></property>

　　　　3）集合類型的注入：

Spring的bean配置 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" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans 5 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> 6 <bean id="personDao" class="cn.itcast.dao.imp.PersonDaoImp"></bean> 7 <bean id="personService" class="cn.itcast.service.imp.PersonServiceBean"> 8 <property name="personDao" ref="personDao"></property> 9 <property name="sets"> 10 <set> 11 <value>set1</value> 12 <value>set2</value> 13 <value>set3</value> 14 </set> 15 </property> 16 <property name="lists"> 17 <list> 18 <value>list1</value> 19 <value>list2</value> 20 <value>list3</value> 21 </list> 22 </property> 23 <property name="properties"> 24 <props> 25 <prop key="pro1">prov1</prop> 26 <prop key="pro2">prov2</prop> 27 <prop key="pro3">prov3</prop> 28 </props> 29 </property> 30 <property name="maps"> 31 <map> 32 <entry key="map1" value="mapv1"></entry> 33 <entry key="map2" value="mapv2"></entry> 34 <entry key="map3" value="mapv3"></entry> 35 </map> 36 </property> 37 </bean> 38 </beans> 注入的組件類 1 package cn.itcast.service.imp; 2 3 import java.util.ArrayList; 4 import java.util.HashMap; 5 import java.util.HashSet; 6 import java.util.List; 7 import java.util.Map; 8 import java.util.Properties; 9 import java.util.Set; 10 11 import cn.itcast.dao.PersonDao; 12 import cn.itcast.service.PersonService; 13 14 public class PersonServiceBean implements PersonService { 15 PersonDao personDao; 16 17 String name; 18 19 Set<String> sets = new HashSet<String>(); 20 21 List<String> lists = new ArrayList<String>(); 22 23 Properties properties = new Properties(); 24 25 Map<String,String> maps = new HashMap<String,String>(); 26 27 public Set<String> getSets() { 28 return sets; 29 } 30 31 public void setSets(Set<String> sets) { 32 this.sets = sets; 33 } 34 35 public List<String> getLists() { 36 return lists; 37 } 38 39 public void setLists(List<String> lists) { 40 this.lists = lists; 41 } 42 43 public Properties getProperties() { 44 return properties; 45 } 46 47 public void setProperties(Properties properties) { 48 this.properties = properties; 49 } 50 51 public Map<String, String> getMaps() { 52 return maps; 53 } 54 55 public void setMaps(Map<String, String> maps) { 56 this.maps = maps; 57 } 58 59 public String getName() { 60 return name; 61 } 62 63 public void setName(String name) { 64 this.name = name; 65 } 66 67 public PersonDao getPersonDao() { 68 return personDao; 69 } 70 71 public void setPersonDao(PersonDao personDao) { 72 this.personDao = personDao; 73 } 74 75 public void save(){ 76 System.out.println(name); 77 personDao.save(); 78 } 79 80 } 測試類 1 package junit.test; 2 3 import java.util.Set; 4 5 import org.junit.Test; 6 import org.springframework.context.ApplicationContext; 7 import org.springframework.context.support.AbstractApplicationContext; 8 import org.springframework.context.support.ClassPathXmlApplicationContext; 9 import org.springframework.context.support.FileSystemXmlApplicationContext; 10 11 import cn.itcast.service.PersonService; 12 13 import junit.framework.TestCase; 14 15 public class SpringTest extends TestCase { 16 17 @Test 18 public void test1(){ 19 AbstractApplicationContext ctr = new ClassPathXmlApplicationContext(new String[]{"beans.xml"}); 20 PersonService personService = (PersonService) ctr.getBean("personService"); 21 for(String value:personService.getSets()){ 22 System.out.println(value); 23 } 24 for(String value:personService.getLists()){ 25 System.out.println(value); 26 } 27 for(Object key :personService.getProperties().keySet()){ 28 System.out.println(key+"_"+personService.getProperties().getProperty((String) key)); 29 } 30 for(Object key :personService.getMaps().keySet()){ 31 System.out.println(key+"_"+personService.getMaps().get(key)); 32 } 33 } 34 }

?5.　　　　通過構造器的方法注入

Spring的bean配置 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" 4 xsi:schemaLocation="http://www.springframework.org/schema/beans 5 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> 6 <bean id="personDao" class="cn.itcast.dao.imp.PersonDaoImp"></bean> 7 <bean id="personService" class="cn.itcast.service.imp.PersonServiceBean"> 8 <constructor-arg index="0" type="cn.itcast.dao.PersonDao" ref="personDao"></constructor-arg> 9 <constructor-arg index="1" value="傳智博客"></constructor-arg> 10 </bean> 11 </beans> ServiceBean中的構造器 1 package cn.itcast.service.imp; 2 3 import java.util.ArrayList; 4 import java.util.HashMap; 5 import java.util.HashSet; 6 import java.util.List; 7 import java.util.Map; 8 import java.util.Properties; 9 import java.util.Set; 10 11 import cn.itcast.dao.PersonDao; 12 import cn.itcast.service.PersonService; 13 14 public class PersonServiceBean implements PersonService { 15 PersonDao personDao; 16 17 String name; 18 19 public PersonServiceBean(PersonDao personDao, String name) { 20 this.personDao = personDao; 21 this.name = name; 22 } 23 24 public void save(){ 25 System.out.println(name); 26 personDao.save(); 27 } 28 29 }

?

轉載于:https://www.cnblogs.com/fanglove/archive/2012/12/07/2807312.html

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