Java 如何在spring的setter注入中使用@Required注释？

@所需的注释用法。我尝试给出上述setter方法，并尝试从上下文中查找bean，而不设置此依赖项。我得到了依赖项设置为null的对象，我期望spring会抛出一些异常。请告诉我哪里做错了

@Required to make it mandatory that the dependency has to be injected

让我们举个例子： 我们需要使用RequiredAnnotationPostProcessor来检查

@Required

依赖项是否已被注入

public class BankService {
  private CustomerService customerService;
  private BillPaymentService billPaymentService;
  @Required
  public void setCustomerService(CustomerService customerService) {
   this.customerService = customerService;
  }
  @Required
  public void setBillPaymentService(BillPaymentService billPaymentService) {
  this.billPaymentService = billPaymentService;
}
}

配置如下

<bean id="custService" class="xml.CustomerServiceImpl" />
<bean id="billingService" class="xml.BillPaymentServiceImpl" />
<bean id="bankService" class="xml.BankServiceImpl">
 <property name="customerService" ref="custService" />
 <property name="billPaymentService" ref="billingService" />
</bean>
<bean class=”o.s.beans.factory.annotation.RequiredAnnotationBeanPostProcessor" />

与bmt的答案相同-只是在这里添加了我所做的验证。
包com.requiredAnnotation；
导入org.springframework.beans.factory.annotation.Required；
公营银行服务{
私人客户服务；
私人账单支付服务账单支付服务；
@必需的
公共无效设置CustomerService（CustomerService CustomerService）{
this.customerService=customerService；
}
@必需的
公共无效setBillPaymentService（BillPaymentService BillPaymentService）{
this.billPaymentService=billPaymentService；
}
公共BillPaymentService getBillPaymentService（）{
返回账单支付服务；
}
公共CustomerService getCustomerService（）{
返回客户服务；
}
}
包com.requiredAnnotation；
公共类客户服务{
}
包com.requiredAnnotation；
公共类付费服务{
}
包com.requiredAnnotation；
导入org.springframework.context.ConfigurableApplicationContext；
导入org.springframework.context.support.ClassPathXmlApplicationContext；
公开课考试{
公共静态void main（字符串[]args）{
ConfigurableApplicationContext applicationContext=new ClassPathXmlApplicationContext（“classpath:com/requiredAnnotation/beans required.xml”）；
BankService BankService=applicationContext.getBean（BankService.class）；
System.out.println（“bankService got.”）；
System.out.println（“getCustomerService-”+bankService.getCustomerService（））；
System.out.println（“getBillPaymentService-”+bankService.getBillPaymentService（））；
}
}
非常感谢，它工作起来很有魅力：）。下面是一个完整的示例，其中包含可编译状态，以便其他人可以直接使用。
Same anwer by bmt - just adding here what i did to verify.

package com.requiredAnnotation;

import org.springframework.beans.factory.annotation.Required;

public class BankService {
    private CustomerService customerService;
    private BillPaymentService billPaymentService;

    @Required
    public void setCustomerService(CustomerService customerService) {
        this.customerService = customerService;
    }

    @Required
    public void setBillPaymentService(BillPaymentService billPaymentService) {
        this.billPaymentService = billPaymentService;
    }

    public BillPaymentService getBillPaymentService() {
        return billPaymentService;
    }

    public CustomerService getCustomerService() {
        return customerService;
    }
}

package com.requiredAnnotation;

public class CustomerService {

}


package com.requiredAnnotation;

public class BillPaymentService {

}


<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">


    <bean id="customerService" class="com.requiredAnnotation.CustomerService" />
    <bean id="billPaymentService" class="com.requiredAnnotation.BillPaymentService" />
    <bean id="bankService" class="com.requiredAnnotation.BankService">
        <property name="customerService" ref="customerService" />
        <!-- <property name="billPaymentService" ref="billPaymentService" /> -->
    </bean>
    <bean class="org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor" />

</beans>

package com.requiredAnnotation;

import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {
    public static void main(String[] args)  {
        ConfigurableApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:com/requiredAnnotation/beans-required.xml");

        BankService bankService = applicationContext.getBean(BankService.class);
        System.out.println("bankService got.");
        System.out.println("getCustomerService - " + bankService.getCustomerService());
        System.out.println("getBillPaymentService - " + bankService.getBillPaymentService());
    }
}