Spring 4.x 中可以为子类注入子类对应的泛型类型的成员变量的引用。
示例
1. 添加Java模型
package xyz.huning.spring4.di.annotation.beancfg.generic; public class Product { private int id; private String name; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "Product [id=" + id + ", name=" + name + "]"; } }
package xyz.huning.spring4.di.annotation.beancfg.generic; public class BaseReposity<T> { public void save() { System.out.println(this.getClass().getGenericSuperclass() + ": save operation."); } }
package xyz.huning.spring4.di.annotation.beancfg.generic; import org.springframework.beans.factory.annotation.Autowired; public class BaseService<T> { @Autowired protected BaseReposity<T> baseReposity; public void save() { baseReposity.save(); } }
package xyz.huning.spring4.di.annotation.beancfg.generic; import org.springframework.stereotype.Repository; @Repository public class ProductReposity extends BaseReposity<Product>{ }
package xyz.huning.spring4.di.annotation.beancfg.generic; import org.springframework.stereotype.Service; @Service public class ProductService extends BaseService<Product> { }
2. 添加配置
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <context:component-scan base-package="xyz.huning.spring4.di.annotation.beancfg.generic"> </context:component-scan> </beans>
3. 添加测试类
package xyz.huning.spring4.di.annotation.beancfg.generic; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("generic-annotation.xml"); ProductService productService = context.getBean("productService", ProductService.class); productService.save(); ((ClassPathXmlApplicationContext)context).close(); } }
4. 执行测试