spring bean依赖与配置

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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。

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