Annotation development management third-party beans

  One 、 Annotation development management third party bean

Suppose it is also the third-party object that manages the Druids

First step ： Import druid coordinate

  The second step ： stay java Class substituted spring Of xml A method is defined in the configuration file to obtain the information of the third party to be managed bean

  The test program ：（ Step 2 get bean When ,ctx. Method return value type ）

  The results are shown below ：

 1.1、 If we want to manage more third-party bean, What shall I do? （ Directly in java Class substituted spring Of xml Define another method in the configuration file ）

  But there will be a problem if it is written like this , There are many third parties that need to be managed bean When , Always here java Instead of the spring Of xml It is impossible to write in the configuration file , Too much can explode ~

Therefore, we basically need to define a third-party management bean When , Just write an interface and copy the code , stay java Instead of the xml Just annotate the class of the file ：

java Class substituted spring Of xml Profile class ：

  Specifically manage third parties jdbc Of bean Object class ：

  Sequencing test ：

Two 、 Annotation development for third parties bean Inject resources

in other words ： For the third party bean Property of

2.1、 Simple type injection

（ in other words ： For the third party bean Such as private String username; Type of username Attribute assignment ）

The code is shown as follows ：

java Instead of the spring Of xml Configuration file class for ：

  The third party bean：

  Program testing ：

2.2、 Injection of reference types （ ！）