Info模式下的隐形杀手(SpringMVC同时使用<mvc:resources.../>和FormattingConversionServiceFactoryBean时出现的问题)
天气一天比一天变的凉快了，而我一天天踩的坑更加贱了，首先在北京向各位问好，也给身边献身教育事业的亲朋好友们补上一句节日快乐！
今天早上手贱把项目误删了，不得不去SVN上去乞求了。我个人习惯项目运行的时候是debug模式跑着，但是，问题来了，启动竟然抛点异常。。。。。可是上周还好好的，让我有点怀疑人生了。但是还有一个但是，我把日志模式改为info模式，这个贱贱的错误又隐藏起来了，项目一切正常运行，是没问题的。声明一点啊，这个错误不是跟日志的模式有关。
出现问题的根源，就是springmvc框架加载项目的时候，同时使用了加载静态资源的<mvc:resources>和定义了全局日期转换器。
1 <!-- 4、加载项目中的静态资源 --> 2 <mvc:resources location="/js/" mapping="/js/**" /> 3 <mvc:resources location="/images/" mapping="/images/**" /> 4 <mvc:resources location="/css/" mapping="/css/**" /> 5 <mvc:resources location="/" mapping="/*.html" /> 6 <!-- 日期统一转换 --> 7 <bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean"> 8 </bean> 9 <mvc:annotation-driven conversion-service="conversionService" />
以这种骚姿态启动项目出现的报错信息，各位先有个印象：
1 2017-09-11 12:59:42 3240 [localhost-startStop-1] DEBUG o.s.beans.TypeConverterDelegate - Original ConversionService attempt failed - ignored since PropertyEditor based conversion eventually succeeded 2 org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.util.ArrayList<?>] to type [java.util.List<org.springframework.core.io.Resource>] for value '[/]'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.util.ArrayList<?>] to type [org.springframework.core.io.Resource] 3 at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:41) 4 at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:192) 5 at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:173) 6 at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:576) 7 at org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:603) 8 at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:203) 9 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1531) 10 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1490) 11 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1230) 12 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) 13 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) 14 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) 15 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) 16 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) 17 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) 18 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:778) 19 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) 20 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) 21 at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:667) 22 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:633) 23 at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:681) 24 at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:552) 25 at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:493) 26 at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 27 at javax.servlet.GenericServlet.init(GenericServlet.java:158) 28 at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1282) 29 at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1195) 30 at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1085) 31 at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5318) 32 at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5610) 33 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) 34 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1572) 35 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1562) 36 at java.util.concurrent.FutureTask.run(FutureTask.java:262) 37 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 38 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 39 at java.lang.Thread.run(Thread.java:744) 40 Caused by: org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.util.ArrayList<?>] to type [org.springframework.core.io.Resource] 41 at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:313) 42 at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:195) 43 at org.springframework.core.convert.support.CollectionToCollectionConverter.convert(CollectionToCollectionConverter.java:87) 44 at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:35) 45 ... 36 common frames omitted
错误提示中最核心的部分是：Failed to convert from type [java.util.ArrayList<?>] to type [java.util.List<org.springframework.core.io.Resource>] for value '[/WEB-INF/statics/js/]'翻译出来就是：
尝试将'[/WEB-INF/statics/js/]从java.util.ArrayList<?> 转换到java.util.List<org.springframework.core.io.Resource>的时候失败了。
【为什么会出现这个问题？由于本人能力有限，还没有真正的了解到具体说法，如朋友你知底，请留言共勉，万分感谢】
但是出现问题我们必须以最快的速度干掉它，那么解决办法我给各位提供了2种(既然是不能用这种方式同时出现，那么我就只允许他们只出现一种)：
1、去除全局日期转换器
这种方式的配置呢，我们主要就是去解决项目中pojo类中日期属性的格式化问题，在这儿我们也可以不用这种方式去转换，而是通过在对象的时间属性上添加注解去格式化，具体看码：
1 public class MortgagerInfo implements Serializable{ 2 3 private String id; //主键 4 private String vin; //VIN码 5 private String mortgagerName; //抵押权人 6 private String masterMortgagerNumber; //主合同号 7 private String mortgagerNumber; //抵押合同号 8 private Double mortgagerCost; //抵押金额 9 @DateTimeFormat(pattern="yyyy-MM-dd") 10 @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8") 11 private Date mortgagerTime; //抵押登记日期 12 private String mortgagerImgUrl; //抵押信息图片 13 @DateTimeFormat(pattern="yyyy-MM-dd") 14 @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8") 15 private Date relieveTime; //解除日期 16 private Integer mortgagerStatus; //抵押标记 17 private String approvalAuthority; //批准机关
2、不要使用<mvc:resources>标签去加载静态资源，而是用以下方式加载，意思就是没有映射到的URL请求交给默认的web容器中的servlet进行处理：
1 <!-- 4、加载项目中的静态资源 --> 2 <!-- <mvc:resources location="/js/" mapping="/js/**" /> 3 <mvc:resources location="/images/" mapping="/images/**" /> 4 <mvc:resources location="/css/" mapping="/css/**" /> 5 <mvc:resources location="/" mapping="/*.html" /> --> 6 <!-- 日期统一转换 --> 7 <bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean"> 8 </bean> 9 <mvc:annotation-driven conversion-service="conversionService" /> 10 11 <mvc:default-servlet-handler />
现在用debug启动，错误消失(走到这儿可别忘了博主在文中请教的问题，留言区不见不散)。
