Springmvc3+Spring3+Freemarker整合异常
提示缺少ui等类，
主要异常信息如下：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping#0': Initialization of bean failed; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Error loading class [org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer] for bean with name 'freemarkerConfig' defined in ServletContext resource [/WEB-INF/spring-servlet.xml]: problem with class file or dependent class; nested exception is java.lang.NoClassDefFoundError: org/springframework/ui/freemarker/FreeMarkerConfigurationFactory Related cause: org.springframework.beans.factory.CannotLoadBeanClassException: Error loading class [org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer] for bean with name 'freemarkerConfig' defined in ServletContext resource [/WEB-INF/spring-servlet.xml]: problem with class file or dependent class; nested exception is java.lang.NoClassDefFoundError: org/springframework/ui/freemarker/FreeMarkerConfigurationFactory
Error loading class [org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer] for bean with name 'freeMarkerConfig' defined in class path resource [springmvc-servlet.xml]: problem with class file or dependent class; nested exception is java.lang.NoClassDefFoundError: org/springframework/ui/freemarker/FreeMarkerConfigurationFactory
解决方法：
增加Jar包： org.springframework.context.support-3.1.1.RELEASE.jar
是少jar包的原因。ui.freemarker等几个类是在spring-context-support.jar包中的,同时在spring中集成freemarker是需要导入freemarder.jar包的
起用JSON转换功能
启动spring MVC的注解功能，完成请求和注解POJO的映射
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <util:list id="beanList"> <ref bean="mappingJacksonHttpMessageConverter" /> </util:list> </property> </bean> <bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
MappingJacksonHttpMessageConverter能够将POJO对象自动转换为JSON对象
MappingJacksonHttpMessageConverter能够将POJO对象自动转换为JSON对象
@ResponseBody的作用是把返回值直接写到HTTP response body里
java.lang.ClassNotFoundException: com.fasterxml.jackson.core.JsonProcessingException at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
是因为Spring高版本中使用的将转换Json的类MappingJackson2HttpMessageConverter使用的是jackson2.x的版本
Java code ? 1 2 <!-- 用于将对象转化为JSON --> <bean id= "jsonConverter" class = "org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" ></bean> 需要导入依赖 Java code ? 1 2 3 4 5 6 <!--jackson--> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version> 2.8 . 7 </version> </dependency>