package com.ujiuye.dao;

public class Restaurant {
private Waiter wt;

public void setWt(Waiter wt) {
    System.out.println("setWt()");
    this.wt = wt;
}
public Restaurant(){
    System.out.println("Restaurant()");
}

@Override
public String toString() {
    return "Restaurant [wt=" + wt + "]";
}

}

<bean id="waiter" class="com.ujiuye.dao.Waiter"/> 
<bean id="restaurant" class="com.ujiuye.dao.Restaurant" autowire="byName"></bean>

============================

public class Waiter {
public Waiter(){
    System.out.println("Waiter()");
}

}

Restaurant类中的属性名叫wt，而你声明的bean的id却是waiter

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byName是通过setter方法来的，比如setName() ，对应bean id或name应该应该为Name

属性注入你没setter怎么能好用

http://www.cnblogs.com/Kevin-mao/p/5752575.html

用@Autowired实现自动装配.