java - bean 类 [Country] : Bean property 'name' is not writable or has an invalid setter method. 的属性 'name' 无效 您的意思是 'cname' 吗？

Question

我是spring的新手，所以我只是想在spring中实现继承。

Customer.java

public class Customer {

    String name;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

Country.java

public class Country {

    String cname;
    String city;
    public String getCname() {
        return cname;
    }
    public void setCname(String cname) {
        this.cname = cname;
    }
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
}

Main.java

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

public class Main {

    public static void main(String args[]){

        ApplicationContext context = new ClassPathXmlApplicationContext("Bean1.xml");
        Customer cus = (Customer) context.getBean("customer");
        System.out.println(cus.getName());
        Country con = (Country) context.getBean("country");
        System.out.println(con.getCname());

    }
}

Bean1.xml

<?xml version = "1.0" encoding = "UTF-8"?>
<beans xmlns = "http://www.springframework.org/schema/beans"
       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-3.0.xsd">

    <bean id = "customer" class = "Customer">
        <property name = "name" value = "Garima"/>    
    </bean>

    <bean id ="country" class="Country" parent="customer">
        <property name = "cname" value = "India"/>
        <property name = "city" value = "Delhi"/>
    </bean>
</beans>

每次我在 Bean1.xml 中运行没有父项的情况时，它都运行良好。一旦我添加了parent，我就会收到下面提到的错误。错误:bean 类 [Country] 的属性 name 无效:Bean 属性 name 不可写或具有无效的 setter 方法。您指的是 cname 吗？我也注意到了这个案例以及许多其他例子。有人可以帮我解决这个问题吗？

Answer 1

这是因为您的 bean 定义表明 Customer 是 Country 的父级，但您的类 Country 不 延长 客户

<bean id ="country" class="Country" parent="customer">

所以你有两个选择

1. 要么从您的 bean 定义中删除 parent="customer"
2. 或在国家/地区类别中扩展客户，例如public class Country 扩展 Customer{...