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Inversion of control (Inversion of Control, abbreviated as IoC) handing over the right to create objects to the framework is an important feature of the framework, not a special term for object-oriented programming. It includes dependency injection (DI) and dependency lookup (Dependency Lookup).

IOC changes the way the program acquires objects, from the initial new of an object to the creation and injection of third-party frameworks. Third-party frameworks typically specify which implementation to inject through configuration, thereby reducing source code coupling.

What are the biggest benefits of ioc?

Because the object generation is defined in XML, when we need to change the implementation of a subclass will become very simple (usually such objects are realistic in a certain interface), as long as modify the XML, so that we can even achieve hot plugging objects (a bit like the USB interface and SCIS hard disk).

According to the way of implementation, IOC can be divided into dependency injection (DI) and dependency lookup.

DI is the main technical way to control inversion, which is divided into setter injection and constructor injection.

Setter injection

After bean is instantiated by calling a no-parameter constructor or static no-parameter factory method, the setter method of bean is called to implement setter injection.

Public class JDBCDataSource () {private String driver; public void setDriver (String driver) {Class.forName (driver); this.driver=driver;}}. .

Next, implement the setter injection configuration xml file

Constructor injection

This is achieved by calling the constructor with parameters, and when the bean is instantiated, the container executes the constructor based on the parameter type.

Public class OracleUserDao implements UserDao {private JDBCDataSource dataSource; public OracleUserDao (JDBCDataSource dataSource) {this.dataSource=dataSource;}}.

Specify injection by construction parameter index

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