Question

spring注解怎么取得bean对象

Answer 1

不用配置xml,直接java代码实现，参考代码如下：

public class GetApplicationContext {
private static class ApplicationContextHolder {
// 单例变量
private static ApplicationContext AC = new FileSystemXmlApplicationContext(
"classpath:applicationContext.xml");
}
// 私有化的构造方法，保证外部的类不能通过构造器来实例化。
private GetApplicationContext() {
}
// 获取单例对象实例
public static ApplicationContext getInstance() {
if (ApplicationContextHolder.AC == null) {
ApplicationContextHolder.AC = new FileSystemXmlApplicationContext(
"classpath:applicationContext.xml");
}
return ApplicationContextHolder.AC;
}
}

获取所有spring自动装配的bean：

<span style="<a href="https://www.baidu.com/s?wd=font-size&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Y4m1RzrHm4mhD1uARsmvub0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EnHRsrH63njD3PjTvnHcknHcvn0" target="_blank" class="baidu-highlight">font-size</a>:18px;">//获取spring装配的bean个数
GetApplicationContext.getInstance().getBeanDefinitionNames().length;
//逐个打印出spring自动装配的bean。根据我的测试，类名第一个字母小写即bean的名字
for(int i=0;i<33;i++){
System.out.println( GetApplicationContext.getInstance().getBeanDefinitionNames()[i]);
}</span>

然后通过下面的代码获取到spring注解装配的bean供自己使用：

1

<span style="<a href="https://www.baidu.com/s?wd=font-size&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Y4m1RzrHm4mhD1uARsmvub0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EnHRsrH63njD3PjTvnHcknHcvn0" target="_blank" class="baidu-highlight">font-size</a>:18px;">StorageReturnService ossService = (StorageReturnService) GetApplicationContext.getInstance().getBean("storageReturnServiceImpl");</span>