Bean 构造函数带参数的方式

构造函数带参数

• 类

1. Bean 类

package cn.asdasd.java.ioc;

public class Bean {
    private AnotherBean anotherBean;
    private String string;

    public Bean(AnotherBean anotherBean, String string) {
        this.anotherBean = anotherBean;
        this.string = string;
    }

    public AnotherBean getAnotherBean() {
        return anotherBean;
    }

    public void setAnotherBean(AnotherBean anotherBean) {
        this.anotherBean = anotherBean;
    }

    public String getString() {
        return string;
    }

    public void setString(String string) {
        this.string = string;
    }

    @Override
    public String toString() {
        return "Bean{" +
                "anotherBean=" + anotherBean +
                ", string='" + string + '\'' +
                '}';
    }
}

2. AnotherBean

package cn.asdasd.java.ioc;

public class AnotherBean {
}

• XMl

    <bean id="anotherBean" class="cn.asdasd.java.ioc.AnotherBean"></bean>
    <bean id="bean" class="cn.asdasd.java.ioc.Bean">
        <constructor-arg index="0" name="anotherBean"
                         type="cn.asdasd.java.ioc.AnotherBean"
                         ref="anotherBean" />
        <constructor-arg index="1" name="string"
                         type="java.lang.String"
                         value="aaa" />
    </bean>

• 测试类

package cn.asdasd.java.ioc.test;

import cn.asdasd.java.ioc.Bean;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class IocTest {
    @Test
    public void test(){
        ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
        Bean bean = context.getBean("bean", Bean.class);
        System.out.println("bean === " +bean);
    }
}