小编Fla*_*vio的帖子

我的控制器中有一个简单的处理程序,它返回一条消息

@RequestMapping(value = "/message")
@ResponseBody
public Message get() {
    return new Message(penguinCounter.incrementAndGet() + " penguin!");
}

同时我可以使用这样的东西

@RequestMapping(value = "/message")
ResponseEntity<Message> get() {
    Message message = new Message(penguinCounter.incrementAndGet() + " penguin!");
    return new ResponseEntity<Message>(message, HttpStatus.OK);
}

这两种方法有什么区别？我们不考虑HttpStatus :)

我wait()在课堂上找到了这个方法Object.
这是最终的,这意味着不能覆盖此方法.
任何想法为什么它是最终的？

我想将H2内存数据库添加到我的Spring MVC应用程序中。对于ORM，我正在使用Hibernate。这是我的配置：

[hibernate.cfg.xml]

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">org.h2.Driver</property>
        <property name="hibernate.connection.url">jdbc:h2:~/myDB</property>
        <property name="hibernate.dialect">org.hibernate.dialect.H2Dialect</property>
        <property name="hibernate.connection.username">sa</property>
        <property name="hibernate.connection.password">qwerty</property>
        <property name="show_sql">true</property>
        <property name="hbm2ddl.auto">create</property>
        <mapping class="de.alf.h2.entity.Student"/>
    </session-factory>
</hibernate-configuration>

[data.xml]

<bean:beans xmlns:bean="http://www.springframework.org/schema/beans"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xmlns:tx="http://www.springframework.org/schema/tx"
            xmlns:ctx="http://www.springframework.org/schema/context"
            xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/tx
            http://www.springframework.org/schema/tx/spring-tx.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd">

    <tx:annotation-driven transaction-manager="transactionManager"/>
    <ctx:component-scan base-package="de.alf.h2.repository"/>
    <bean:bean id="template" class="org.springframework.orm.hibernate3.HibernateTemplate">
        <bean:property name="sessionFactory" ref="sessionFactory"/>
    </bean:bean>
    <bean:bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <bean:property name="configLocation" value="classpath:/hibernate/hibernate.cfg.xml"/>
    </bean:bean>
    <bean:bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <bean:property name="sessionFactory" ref="sessionFactory"/>
    </bean:bean>
</bean:beans>

[web.xml]

<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <servlet> …