spring整合mybatis,springMVC的0配置文件方式

　　0配置文件的形式主要是采用spring3.0提供的@configuration注解和spring容器在启动的时候会加载实现了WebApplicationInitializer的类,并调用其onStartUp的方法的特性去实现.

　　具体做法如下:

　　1.建立MyWebAppInitializer去实现WebApplicationInitializer接口,并且去重写其onStartUp方法.实际上这个类取代了web.xml的配置.代码如下:

public class MyWebAppInitializer implements WebApplicationInitializer{

@Override
public void onStartup(ServletContext servletContext) throws ServletException {
//相当于在web.xml在配置spring启动用的ContextLoaderListener
AnnotationConfigWebApplicationContext rootContext=new AnnotationConfigWebApplicationContext();
rootContext.register(AppConfig.class);
servletContext.addListener(new ContextLoaderListener(rootContext));
//相当于在web.xml在配置DispatcherServlet
AnnotationConfigWebApplicationContext webContext=new AnnotationConfigWebApplicationContext();
webContext.register(WebConfig.class);
Dynamic registration = servletContext.addServlet("dispatcher",new DispatcherServlet(webContext));
registration.setLoadOnStartup(1);
registration.addMapping("/");
}

}

　　2.建立WebConfig.class.这个类用于取代spring的配置文件springmvc.xml.代码如下:相关注解的解释写在注释中.

@EnableWebMvc        //开启springmvc的配置
@Configuration        //开启基于Java类的配置
@ComponentScan(basePackages="com.xyy.web")
public class WebConfig extends WebMvcConfigurerAdapter{
//配置与dispatcherServlet相关联的bean
@Bean//代表这是一个bean.spring容器会将其放在容器中.
public ViewResolver viewResolver() {
InternalResourceViewResolver resolver=new InternalResourceViewResolver();
resolver.setPrefix("/");
resolver.setSuffix(".jsp");
resolver.setExposeContextBeansAsAttributes(true);//使得可以在jsp页面中可以通过${}访问bean
return resolver;
}
//开启静态文件的访问.
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}

}

　　3.建立AppConfig.class.它用于取代applicationContext.xml.这里我们使用了c3p0数据库连接池配合mybatis框架使用

@EnableAspectJAutoProxy//开启自动注解扫描
@EnableTransactionManagement//配置事务管理
@Configuration
@ComponentScan(basePackages="com.xyy")//扫描注解
public class AppConfig {
//配置c3p0数据源
@Bean
public DataSource dataSource() {
ComboPooledDataSource dataSource=new ComboPooledDataSource();
try {
dataSource.setDriverClass("com.mysql.jdbc.Driver");
} catch (PropertyVetoException e) {
e.printStackTrace();
}
dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");
dataSource.setUser("root");
dataSource.setPassword("root");
return dataSource;
}
//配置SqlSessionFactoryBean
@Bean
public SqlSessionFactoryBean sqlSessionFactory() {
SqlSessionFactoryBean bean=new SqlSessionFactoryBean();
bean.setConfigLocation(new ClassPathResource("SqlMapConfig.xml"));
bean.setDataSource(dataSource());
return bean;
}
//配置开启Mapper扫描
@Bean
public MapperScannerConfigurer mapperScannerConfigurer() {
MapperScannerConfigurer configurer=new MapperScannerConfigurer();
configurer.setBasePackage("com.xyy.mapper");
return configurer;
}
//配置开启DataSourceTransactionManager
@Bean
public DataSourceTransactionManager dataSourceTransactionManager() {
DataSourceTransactionManager manager=new DataSourceTransactionManager();
manager.setDataSource(dataSource());
return manager;
}
}

　　4.至此,我们就可以正常的建立Controller类书写代码了.不过,不要忘记在对应的类上加上@controller,@service,@repository哦.

　 5.此外,为了防止会出现乱码的情况,我们最好再配上spring提供的CharacterEncodingFilter去解决乱码问题.方式如下,也是在MyWebAppInitializer类中配置的: