周末加班，想把spring3升级到spring4。 列一下遇到的坑

更换spring版本为

4.2.3

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>4.2.3.RELEASE</version>
</dependency>

加入spring support:

3中很多的扩展内容不需要引入support，但是4中分离的更彻底了，如果不分离，会很多ClassNotFound

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context-support</artifactId>
    <version>4.2.3.RELEASE</version>
</dependency>

更换springmvc jackson依赖

spring mvc中如果过返回json需要依赖jackson的jar包，但是他升级到了2, 以前是codehaus.jackson，现在换成了fasterxml.jackson

<dependency>      
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.7.0</version>
</dependency>
<dependency>                
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.7.0</version>
</dependency>

同时修改spring mvc的配置文件：

<bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                 <ref bean="stringHttpMessageConverter" />  
                <bean
                    class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                </bean>
            </list>
        </property>
    </bean>

    <bean id="stringHttpMessageConverter"
        class="org.springframework.http.converter.StringHttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <value>text/plain;charset=UTF-8</value>
            </list>
        </property>
    </bean>

修改Spring配置文件的xsd

修改Spring使用的quartz

<dependency>
                <groupId>org.quartz-scheduler</groupId>
                <artifactId>quartz</artifactId>
                <version>2.2.2</version>
            </dependency>

同时修改quartz的配置文件：

<bean id="lctWorkTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
        <property name="jobDetail">
            <bean class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
                <!-- 调用的类 -->
                <property name="targetObject">
                    <ref bean="pushMessageWork" />
                </property>
                <!-- 调用类中的方法 -->
                <property name="targetMethod">
                    <value>work</value>
                </property>
            </bean>
        </property>
        <!-- cron表达式 -->
        <property name="cronExpression">
            <value>0/30 * * * * ?</value>
        </property>
    </bean>

    <!-- 总管理类 如果将lazy-init='false'那么容器启动就会执行调度程序 -->
    <bean id="startQuertz" lazy-init="false" autowire="no"
        class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
        <property name="triggers">
            <list>
                <ref bean="lctWorkTrigger" />
            </list>
        </property>
    </bean>