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依赖查找安全性比照
依赖查找类型 | 代表实现 | 是否平安 |
---|---|---|
繁多类型 | BeanFactory#getBean | 否 |
ObjectFactory#getObject | 否 | |
ObjectProvider#getIfAvailable | 是 | |
汇合类型 | ListableBeanFactory#getBeansOfType | 是 |
ObjectProvider#stream | 是 |
实体类 Rumenz.java
package com.rumenz;
public class Rumenz{
private Integer id;
private String name;
@Override
public String toString() {
return "Rumenz{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
public Integer getId() {return id;}
public void setId(Integer id) {this.id = id;}
public String getName() {return name;}
public void setName(String name) {this.name = name;}
}
BeanFactory#getBean 繁多类型查找
package com.rumenz;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import java.util.Map;
public class DemoApplication {public static void main(String[] args) {AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext();
ac.register(DemoApplication.class); // 没有注册 Rumenz.class
ac.refresh();
// 通过 BeanFactory#getBean
byBeanFactory(ac);
ac.close();}
private static void byBeanFactory(AnnotationConfigApplicationContext ac) {printBeanException("byBeanFactory",()->ac.getBean(Rumenz.class));
}
private static void printBeanException(String msg, Runnable runnable) {System.err.println("from---->>>"+msg);
try{runnable.run();
}catch (Exception e){e.printStackTrace();
}
}
}
输入
因为没有注册 Rumenz.class, 所以查找报错, 不平安
from---->>>byBeanFactory
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.rumenz.Rumenz' available
ObjectFactory#getObject 繁多类型查找
package com.rumenz;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import java.util.Map;
public class DemoApplication {public static void main(String[] args) {AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext();
ac.register(DemoApplication.class);
ac.refresh();
// 通过 ObjectFactory#getObject
byObjectFactory(ac);
ac.close();}
private static void byObjectFactory(AnnotationConfigApplicationContext ac) {ObjectProvider<Rumenz> beanProvider = ac.getBeanProvider(Rumenz.class);
printBeanException("byObjectFactory",()->beanProvider.getObject());
}
private static void printBeanException(String msg, Runnable runnable) {System.err.println("from---->>>"+msg);
try{runnable.run();
}catch (Exception e){e.printStackTrace();
}
}
}
输入
因为没有注册 Rumenz.class, 所以查找报错, 不平安
from---->>>byObjectFactory
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.rumenz.Rumenz' available
ObjectProvider#getIfAvailable 繁多类型查找
package com.rumenz;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import java.util.Map;
public class DemoApplication {public static void main(String[] args) {AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext();
ac.register(DemoApplication.class);
ac.refresh();
// 通过 ObjectProvider#getIfAvailable
byObjectProvider(ac);
ac.close();}
private static void byObjectProvider(AnnotationConfigApplicationContext ac) {ObjectProvider<Rumenz> beanProvider = ac.getBeanProvider(Rumenz.class);
printBeanException("byObjectProvider",()->beanProvider.getIfAvailable());
}
private static void printBeanException(String msg, Runnable runnable) {System.err.println("from---->>>"+msg);
try{runnable.run();
}catch (Exception e){e.printStackTrace();
}
}
}
输入
不存在 Rumenz.class, 也不会报错, 平安
from---->>>byObjectProvider
ListableBeanFactory#getBeansOfType 汇合查找
package com.rumenz;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import java.util.Map;
public class DemoApplication {public static void main(String[] args) {AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext();
ac.register(DemoApplication.class);
ac.refresh();
// 通过 ListableBeanFactory#getBeansOfType 汇合类型查找
byListableBeanFactory(ac);
ac.close();}
private static void byListableBeanFactory(AnnotationConfigApplicationContext ac) {printBeanException("byListableBeanFactory",()->ac.getBeansOfType(Rumenz.class));
}
private static void printBeanException(String msg, Runnable runnable) {System.err.println("from---->>>"+msg);
try{runnable.run();
}catch (Exception e){e.printStackTrace();
}
}
}
输入
不存在 Rumenz.class, 也不会报错, 平安
from---->>>byListableBeanFactory
ObjectProvider#Stream 汇合类型查找
package com.rumenz;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import java.util.Map;
public class DemoApplication {public static void main(String[] args) {AnnotationConfigApplicationContext ac=new AnnotationConfigApplicationContext();
ac.register(DemoApplication.class);
ac.refresh();
// 通过 ObjectProvider#stream
byObjectProviderStream(ac);
ac.close();}
private static void byObjectProviderStream(AnnotationConfigApplicationContext ac) {ObjectProvider<Rumenz> beanProvider = ac.getBeanProvider(Rumenz.class);
printBeanException("byObjectProviderStream",()->beanProvider.stream().forEach(System.out::println));
}
private static void printBeanException(String msg, Runnable runnable) {System.err.println("from---->>>"+msg);
try{runnable.run();
}catch (Exception e){e.printStackTrace();
}
}
}
输入
不存在 Rumenz.class, 也不会报错, 平安
from---->>>byObjectProviderStream
源码:https://github.com/mifunc/Spr…
原文: https://rumenz.com/rumenbiji/.html
正文完