SpringMVC+Spring4+hibernate5使用java类配置spring和springmvc环境(不用配置web.xml)

最新推荐文章于 2022-05-02 11:44:09 发布

原创最新推荐文章于 2022-05-02 11:44:09 发布 · 置顶 · 2.5k 阅读

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#hibernate #spring #spring mvc #java

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本文介绍如何使用Spring的@Configuration注解配置应用上下文，包括数据源、SessionFactory、Transaction Manager等核心组件的设置方法，同时展示了Spring MVC配置，如ViewResolver和Controller的设置。

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使用Spring提供的@Configuration注解配置Spring的应用上下文


//spring应用上下文配置类
@Configuration
@ComponentScan(basePackageClasses={SpringConfiguration.class},
excludeFilters={@Filter(type=FilterType.ANNOTATION,value=EnableWebMvc.class)})//声明包扫描，并将@EnableWebMvc注解声明的类扫描包除去
@EnableTransactionManagement
@ImportResource(locations={"classpath:beans.xml"})
@PropertySource({"classpath:jdbc.properties"})//导入peoperties文件
public class SpringConfiguration {
    /**
    *简单配置数据源和hibernate的SessionFactory
    */
    @Autowired
    private Environment env;
    @Bean(name="sessionFactory")
    public LocalSessionFactoryBean sessionFactory() {
        LocalSessionFactoryBean sfb=new LocalSessionFactoryBean();
        sfb.setDataSource(dataSource());
        sfb.setPackagesToScan("org.learn.sshmvc.model");
        Properties prop=new Properties();
        prop.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
        prop.setProperty("hibernate.show_sql", "true");
        prop.setProperty("hibernate.hbm2ddl.auto", "update");
        prop.setProperty("hibernate.format_sql", "false");
        sfb.setHibernateProperties(prop);
        return sfb;
    }
    @Bean(destroyMethod="close")
    public BasicDataSource dataSource() {
        BasicDataSource dataSource=new BasicDataSource();
        dataSource.setUsername(env.getProperty("jdbc.username"));
        dataSource.setPassword(env.getProperty("jdbc.password"));
        dataSource.setUrl(env.getProperty("jdbc.url"));
        dataSource.setDriverClassName(env.getProperty("jdbc.driverClassName"));
        dataSource.setInitialSize(1);
        dataSource.setMinIdle(1);
        dataSource.setMaxIdle(20);
        return dataSource;
    }
    @Bean(name="transactionManager")
    @Autowired
    @Required
    public HibernateTransactionManager transactionManager(SessionFactory s) {
        HibernateTransactionManager txManager=new HibernateTransactionManager();
        txManager.setSessionFactory(s);
        return txManager;
    }
}

再进行和SpringMVC相关的viewReslover和Contorller的配置

@Configuration
@EnableWebMvc//声明为mvc配置
@ComponentScan(basePackages={"org.learn.sshmvc.controller"})//扫描web controller
public class WebConfig extends WebMvcConfigurerAdapter{
    /**
    *继承WebMvcConfigurerAdapter类
    */
    @Bean//配置InternalResourceViewResolver，和xml配置一样
    public ViewResolver viewResolver() {
        InternalResourceViewResolver resolver=new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/jsp/");
        resolver.setSuffix(".jsp");
        resolver.setExposeContextBeansAsAttributes(true);
        return resolver;
    }

    @Override//重写configureDefaultServletHandling方法，并允许静态资源直接访问
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
}

Web环境初始化的类，相当于在web.xml配置spring的监听器和DispatcherServlet（只有在Servlet3.0后的环境中才能使用）

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
/**
 * 继承AbstractAnnotationConfigDispatcherServletInitializer
 * 抽象类覆盖三个方法
 */
public class WebappInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {


    @Override//配置Spring应用上下文的配置类
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{SpringConfiguration.class};
    }

    @Override//配置web controller和view的配置类
    protected Class<?>[] getServletConfigClasses() {
        return new Class<?>[]{WebConfig.class};
    }

    @Override//相当于在DispatcherServlet中配置路径"/"
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }

}