Springboot java configuration method (instance description), springboot instance description

Springboot java configuration method (instance description), springboot instance description

1. Create a User object class.

@Datapublic class User { private String username; private String password; private Integer age;}

2. Create UserDao to simulate database interaction.

Public class UserDao {public List <User> queryUserList () {List <User> result = new ArrayList <User> (); // simulate database query for (int I = 1; I <10; I ++) {User user = new User (); user. setUsername ("username _" + I); user. setPassword ("password" + I); user. setAge (I); result. add (user) ;}return result ;}}

3. Write UserService to implement User data operation business logic.

@ Servicepublic class UserService {@ Autowired // inject the bean object private UserDao userDao in the Spring container; public List <User> queryUserList () {// call the method in userDao for query. Return this. userDao. queryUserList ();}}

4. Compile SpringConfig to instantiate the Spring container.

@ Configuration // This annotation indicates that the class is a spring Configuration, which is equivalent to an xml file. // Configure the scan package. @ ComponentScan (basePackages = "cn. my. springboot. javaconfig ") public class SpringConfig {@ Bean // This annotation indicates that it is a Bean object, which is equivalent to <bean> public UserDao getUserDao () {return new UserDao () in xml (); // The new object is used for demonstration. }}

5. Compile the test method to start the Spring container.

Public class Test {public static void main (String [] args) {// instantiate the Spring container through java configuration. AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext (SpringConfig. class); // obtain the bean object UserService userService = context in the Spring container. getBean (UserService. class); // call the method List in the object <User> list = userService. queryUserList (); for (User user: list) {System. out. println (user. getUsername () + "|" user. getPassword () + "|" user. getAge (); // destroy the container context. destroy ;}}}

Test results:

Java code can be used to perfectly replace XML configuration files.

If the structure is unclear, it means that the benevolent sees the wise and the wise sees the wise.

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