session的使用——spring boot

springboot中默认session时长是60s，根据业务需求，可以在主程序ApplicationMain.java中配置。

/**
 * Created by ph 18/7/12.
 *
 */
@Configuration//配置控制
@ComponentScan(basePackages = {"cn.com.hisee.hdta.configcenter","cn.com.hisee.common"})
@ImportResource(value = {"classpath:configcenter-dao.xml", "classpath:configcenter-domain.xml"})
@EnableAutoConfiguration//启用自动配置
@SpringBootApplication
public class ApplicationMain extends SpringBootServletInitializer {

    private static final Logger logger = LoggerFactory.getLogger(ApplicationMain.class);

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(this.getClass());
    }

    public static void main(String[] args) throws Exception {
        //启动Spring Boot项目的唯一入口
        SpringApplication.run(ApplicationMain.class, args);
    }


    /**
     * 编码设置
     * @return
     */
    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
        characterEncodingFilter.setEncoding("UTF-8");
        registrationBean.setFilter(characterEncodingFilter);
        return registrationBean;
    }

    /**
     * session时长设置
     * @return
     */
    @Bean
    public EmbeddedServletContainerCustomizer containerCustomizer(){
        return new EmbeddedServletContainerCustomizer() {
            @Override
            public void customize(ConfigurableEmbeddedServletContainer Container) {

                Container.setSessionTimeout(12*60*60);//单位为S
            }
        };
    }
}

模拟真实业务，一般用户登录后需要把用户id存入session
以下是实例代码

【用户session类：UserSession】

/**
 * Created by ph on 2018/7/12.
 */
@Scope(value = "session", proxyMode = ScopedProxyMode.TARGET_CLASS)
@Component
public class UserSession implements Serializable{

    private static final long serialVersionUID = 9120765714832970813L;
    //id
    private Integer userId;
    //账号
    private String username;
    
    //getter  setter 方法
}

这里注意@Scope注解：
    @Scope(value=ConfigurableBeanFactory.SCOPE_PROTOTYPE)这个是说在每次注入的时候回自动创建一个新的bean实例
    @Scope(value=ConfigurableBeanFactory.SCOPE_SINGLETON)单例模式，在整个应用中只能创建一个实例
    @Scope(value=WebApplicationContext.SCOPE_GLOBAL_SESSION)全局session中的一般不常用
    @Scope(value=WebApplicationContext.SCOPE_APPLICATION)在一个web应用中只创建一个实例
    @Scope(value=WebApplicationContext.SCOPE_REQUEST)在一个请求中创建一个实例
    @Scope(value=WebApplicationContext.SCOPE_SESSION)每次创建一个会话中创建一个实例
里面还有个属性
    proxyMode=ScopedProxyMode.INTERFACES创建一个JDK代理模式
    proxyMode=ScopedProxyMode.TARGET_CLASS基于类的代理模式
    proxyMode=ScopedProxyMode.NO（默认）不进行代理

【业务类userService】

public class UserService{

  /**
     * 用户登录
     * @return
     */
    public CallResult login(){
        String username = userParam.getUsername();
        String password = userParam.getPassword();

        //密码数据库对比
        UserInfo userInfo = this.userDomainRepository.findUserInfoByUsername(username);

        //将用户session
        this.addSession(userInfo);

        System.out.println("username  : "+userInfo.getUsername()+" 登录-----");

        return CallResult.success(userInfo.getId());
    }

    /**
     * 用户退出
     * @return
     */
    public CallResult exit(){
        userSession.setUsername(null);
        userSession.setUserId(null);
        return CallResult.success();
    }

    /**
     * 将登录的用户存入session
     * @param userInfoModel
     */
    public void addSession(UserInfo userInfo){
        userSession.setUserId(userInfo.getId());
        userSession.setUsername(userInfo.getUsername());
    }
}

以上是将用户对象存储在ioc容器中，为session域，以下为获取session（即getBean方式）

SpringUtil.java

@Component
public class SpringUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext = null;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringUtil.applicationContext == null){
            SpringUtil.applicationContext  = applicationContext;
        }
    }
    //获取applicationContext
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
    //通过name获取 Bean.
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }
    //通过class获取Bean.
    public static  T getBean(Class clazz){
        return getApplicationContext().getBean(clazz);
    }
    //通过name,以及Clazz返回指定的Bean
    public static  T getBean(String name,Class clazz){
        return getApplicationContext().getBean(name, clazz);
    }
}

获取userSession

//获取session用户
UserSession userSession = SpringUtil.getBean(UserSession.class);