spring bean依赖与配置

一个最基本的bean

public class User {

    private String username;
    private String password;

    public String getUsername()
    {
        return this.username;
    }

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

    public String getPassword()
    {
        return this.password;
    }

    public void setPassword(String password)
    {
        this.password = password;
    }
}

 接着在一个类中创建spring 容器：

 ClassPathXmlApplicationContextctx =
                    new ClassPathXmlApplicationContext("beans.xml");

stx.getBean("xxxxxxxx");

在beans.xml中最基本的配置

1.<property>

<?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:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
    <!-- 注册一个 UserDAOImpl 对象实例-->
    <bean id="u" class="com.deciphering.User">
        
        <property name="usrname" value="kack"></property>
        <property name="password" value="123"></property>
        </bean>


    </beans>

2.配合setter方法  使用 <ref>

 <bean id="userService" class="com.deciphering.dao.service.UserServiceImpl">

        <!--  构造方式 将UserDAOImpl  u 对象实例 注入到 UserServiceImpl 中的userDAO -->

        <property name="userDAO">
            <ref bean="u">
            </property>
    </bean>

3.配合构造方法，<constructor-arg>使用

 <!-- 注册一个 UserServiceImpl 对象实例-->
    <bean id="userService" class="com.deciphering.dao.service.UserServiceImpl">

        <!--  构造方式 将UserDAOImpl  u 对象实例 注入到 UserServiceImpl 中的userDAO -->

        <constructor-arg >
            <ref bean="u">
        </constructor-arg>
    </bean>

public class UserServiceImpl implements UserService
{
    private UserDAO userDAO;

    public UserServiceImpl(UserDAO userDAO)
    {
        super();
        this.UserDAO = UserDAO;
    }

    public void add(User user)
    {
        userDAO.save(user);
    }

    public UserDAO getUserDAO()
    {
        return this.userDAO
    }

    public void setUserDAO(UserDAO userDAO)
    {
        this.userDAO = userDAO;
    }

4.集合注入

public class User {
    
    
    private Set<String> sets;
    private List<String> list;
    private Map<String,String> maps;
    
}

bean里面含有集合

<property name="sets">
    <set>
        <value>1</value>
        <value>2</value>
        <value>3</value>
    </set>
</property>

<property name="list">
    <list>
        <value>1</value>
        <value>2</value>
        <value>3</value>
    </list>
</property>

<property name="maps">
<map>
    <entry key="1" value="1"></entry>
    <entry key="2" value="2"></entry>
    <entry key="3" value="3"></entry>
</map>
</property>

分别是set list map集合 设置数据

spring中的beans有不同的生命周期和作用于，在spring3.0中已经扩展到5种作用域，有时间再深入细聊。