spring基础-Bean的装配方式（一）基于xml的装配

spring基础-Bean的装配方式（一）基于xml的装配

有两种方式：设置注入和构造注入

用例子说明

先写一个User类

public class User {
	private String username;
	private Integer password;
//默认构造器      
       public User(){
		super();
	}
//构造方法注入      
       public User(String username,Integer password){
		super();
		this.username=username;
		this.password=password;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public Integer getPassword() {
		return password;
	}
	public void setPassword(Integer password) {
		this.password = password;
	}
	public String toString(){
		return "User[username="+username+",password="+password+"]";
	}

}

<!--构造注入,constructor-arg传入参数，index代表参数位置，从0开始，value传入值--> 
<bean id="user1" class="cn.assemble.User">
      	<constructor-arg index="0" value="jack"></constructor-arg>
      	<constructor-arg index="1" value="1234"></constructor-arg>
      </bean>
    <!--实用set方式装配user实例，调用的是默认构造器-->
      <bean id="user2" class="cn.assemble.User">
      	<property name="username" value="tom"></property>
      	<property name="password" value="4321"></property>
      </bean>
</beans>