Spring2.5注入方式
Spring2.5依靠注入的方式有三种：
通过setter方法注入；
通过构造方法注入；
通过注解进行注入；
第一种方式：通过setter方法注入
Java代码
package com.test;
public class UserServiceImplement implements IUserService
{
private IUserDao user;
public IUserDao getUser() {
return user;
}
public void setUser(IUserDao user) {
this.user = user;
}
public void saveUser() {
user.addUser();
}
}
package com.test;public class UserServiceImplement implements IUserService{ private IUserDao user; public IUserDao getUser() { return user; } public void setUser(IUserDao user) { this.user = user; } public void saveUser() { user.addUser(); }}
Xml代码
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:lang="http://www.springframework.org/schema/lang"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd">
<bean id="userdao" ref="userdao"></property>
</bean>
</beans>
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:lang="http://www.springframework.org/schema/lang" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd"> <bean id="userdao" ref="userdao"></property> </bean></beans>
注重这种方法还可以把XML改成以下方式：
Xml代码
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:lang="http://www.springframework.org/schema/lang"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd">
<bean id="userservice" ref="userdao"></property>-->
<property name="user">
<bean encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:lang="http://www.springframework.org/schema/lang" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd"> <bean id="userservice" ref="userdao"></property>--> <property name="user"> <bean xmlns:lang="http://www.springframework.org/schema/lang"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd">
<bean id="userdao" type="com.test.IUserDao"
ref="userdao"></constructor-arg>
<constructor-arg index="1" value="24"></constructor-arg>
</bean>
</beans>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:lang="http://www.springframework.org/schema/lang" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd"> <bean id="userdao" type="com.test.IUserDao" ref="userdao"></constructor-arg> <constructor-arg index="1" value="24"></constructor-arg> </bean></beans>
注重
<construcotr-arg>标签中的index属性假如构造方法只有一个参数的时候可以不指定，它的下标从0开始，表示构造方法参数的索引，假如有构造方法有多个参数必须指定索引。除此之外还有一个type属性，这个属性用来指定被注入的参数的参数类型，一定要跟构造方法中的参数类型一致，假如是一个接口，那么也不答应传它的实现类，这是一个可选属性；
假如构造函数的的参数类型是基本数据类型，那么就不用ref属性了，而用value属性设置它的值，而且这些数据类型会自动打包和解包；
同样要注重bean的作用域问题。
测试代码同上......
第三种方式：通过java注解进行注入
使用这种方式进行注入可以用两个标注：
@Resource
@Autowired
两者的区别：1. @Resource标注是由JDK提供的，而@Autowired标注是由Spring提供的，因而@Autowired标注会与Spring紧密耦合，所以推荐使用@Resource标注；
2. @Resource默认是按照名称来装配注入的，当找不到与名称匹配的bean才会按照类型来装配注入；
3. @Autowired默认是按照类型装配注入的，假如想按照名称来转配注入，则需要结合@Qualifier一起使用；
4. @Resource和@Autowired都可以用来标注字段或者setter方法。
I.使用@Resource标注进行注入
Java代码
package com.test;
import javax.annotation.Resource;
public class UserServiceImplement implements IUserService {
@Resource
private IUserDao user;
private IUserDao user1;
public IUserDao getUser1() {
return user1;
}
@Resource
public void setUser1(IUserDao user1) {
this.user1 = user1;
}
public void saveUser() {
user.addUser();
System.out.println("user注入成功");
user1.addUser();
System.out.println("user1注入成功");
}
}
package com.test;import javax.annotation.Resource;public class UserServiceImplement implements IUserService { @Resource private IUserDao user; private IUserDao user1; public IUserDao getUser1() { return user1; } @Resource public void setUser1(IUserDao user1) { this.user1 = user1; } public void saveUser() { user.addUser(); System.out.println("user注入成功"); user1.addUser(); System.out.println("user1注入成功"); }}
Xml代码
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:annotation-config />
<bean id="user" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> <context:annotation-config /> <bean id="user" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:annotation-config />
<bean id="user" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> <context:annotation-config /> <bean id="user" class="com.test.UserServiceImplement"></bean></beans>
测试类：
Java代码
package com.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext(
"com/test/bean.xml");
IUserService us = (IUserService) ctx.getBean("userservice");
us.saveUser();
}
}
package com.test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Test { public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext( "com/test/bean.xml"); IUserService us = (IUserService) ctx.getBean("userservice"); us.saveUser(); }}
