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This article mainly explains "the introduction of five automatic assembly modes in the spring framework". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn the introduction of the five automatic assembly modes in the spring framework.

No: this is the default setting of the Spring framework. Under this setting, automatic assembly is turned off, and developers need to explicitly set dependencies with tags in the bean definition. By default, automatic configuration is set manually through the "ref" property.

ByName: this option sets dependencies based on the bean name. When an attribute is automatically assembled into a bean, the container automatically queries the configuration file for a matching bean based on the name of the bean. If you find that the name of a bean is the same as the name of any other bean attribute, assemble this property and report an error if it is not found.

ByType: this option sets dependencies based on the bean type. When an attribute is automatically assembled into a bean, the container automatically queries the configuration file for a matching bean based on the type of bean. If you find a bean whose data type is the data type of another bean property, assemble this property and report an error if it is not found.

Constructor: the auto-assembly of the constructor is similar to the byType mode, but only applies to bean with the same parameters as the constructor. If no bean is found in the container that matches the constructor parameter type, an exception will be thrown.

Autodetect: this mode automatically detects using constructor auto-assembly or byType auto-assembly. First of all, first of all, we will try to find a suitable constructor with parameters, and if we find it, we will automatically assemble it with a constructor. If no corresponding constructor or no parameter constructor is found within bean, the container will automatically choose the automatic assembly mode of byTpe.

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