<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>cn.itcast.springboot</groupId><artifactId>itcast-springboot</artifactId><version>1.0.0-SNAPSHOT</version><packaging>war</packaging><dependencies><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>4.3.7.RELEASE</version></dependency><!-- 连接池 --><dependency><groupId>com.jolbox</groupId><artifactId>bonecp-spring</artifactId><version>0.8.0.RELEASE</version></dependency></dependencies><build><finalName>${project.artifactId}</finalName><plugins><!-- 资源文件拷贝插件 --><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-resources-plugin</artifactId><configuration><encoding>UTF-8</encoding></configuration></plugin><!-- java编译插件 --><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><source>1.7</source><target>1.7</target><encoding>UTF-8</encoding></configuration></plugin></plugins><pluginManagement><plugins><!-- 配置Tomcat插件 --><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.2</version></plugin></plugins></pluginManagement></build>
</project>

public class User {private String username;private String password;private Integer age;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}}

public class UserDAO {public List<User> queryUserList(){List<User> result = new ArrayList<User>();// 模拟数据库的查询for (int i = 0; i < 10; i++) {User user = new User();user.setUsername("username_" + i);user.setPassword("password_" + i);user.setAge(i + 1);result.add(user);}return result;}}

@Servicepublic class UserService {@Autowired // 注入Spring容器中的bean对象private UserDAO userDAO;public List<User> queryUserList() {// 调用userDAO中的方法进行查询return this.userDAO.queryUserList();}}

@Configuration //通过该注解来表明该类是一个Spring的配置，相当于一个xml文件@ComponentScan(basePackages = "cn.itcast.springboot.javaconfig") //配置扫描包public class SpringConfig {@Bean // 通过该注解来表明是一个Bean对象，相当于xml中的<bean>public UserDAO getUserDAO(){return new UserDAO(); // 直接new对象做演示}}

public class Main {public static void main(String[] args) {// 通过Java配置来实例化Spring容器AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);// 在Spring容器中获取Bean对象UserService userService = context.getBean(UserService.class);// 调用对象中的方法List<User> list = userService.queryUserList();for (User user : list) {System.out.println(user.getUsername() + ", " + user.getPassword() + ", " + user.getPassword());}// 销毁该容器context.destroy();}}