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I. 主动注册Bean支持
借助BeanDefinition来实现bean的定义,从最终的使用来看,代码比较少,几行而已
public <T> T registerBean(String name, Class<T> clazz, Object... args) {
BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(clazz);
if (args.length > 0) {
for (Object arg : args) {
beanDefinitionBuilder.addConstructorArgValue(arg);
}
}
BeanDefinition beanDefinition = beanDefinitionBuilder.getRawBeanDefinition();
BeanDefinitionRegistry beanFactory = (BeanDefinitionRegistry) applicationContext.getBeanFactory();
beanFactory.registerBeanDefinition(name, beanDefinition);
return applicationContext.getBean(name, clazz);
}
测试如下
import com.github.hui.story.quickstory.server.VisitService;
import lombok.ToString;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.stereotype.Component;
@Component
public class BeanHolder {
private final ConfigurableApplicationContext applicationContext;
public BeanHolder(ConfigurableApplicationContext applicationContext) {
this.applicationContext = applicationContext;
initSer();
}
public void initSer() {
InrSer ser = registerBean("test", InrSer.class);
ser.name = "一灰";
ser.uid = 22;
System.out.println(ser);
InrSer ser2 = registerBean("test2", InrSer.class, "一灰灰Blog", 20);
System.out.println(ser2);
}
@ToString
public static class InrSer {
private String name;
private Integer uid;
@Autowired
private VisitService visitService;
public InrSer() {
}
public InrSer(String name, Integer uid) {
this.name = name;
this.uid = uid;
}
}
private <T> T registerBean(String name, Class<T> clazz, Object... args) {
BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(clazz);
if (args.length > 0) {
for (Object arg : args) {
beanDefinitionBuilder.addConstructorArgValue(arg);
}
}
BeanDefinition beanDefinition = beanDefinitionBuilder.getRawBeanDefinition();
BeanDefinitionRegistry beanFactory = (BeanDefinitionRegistry) applicationContext.getBeanFactory();
beanFactory.registerBeanDefinition(name, beanDefinition);
return applicationContext.getBean(name, clazz);
}
}
输出如下
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