SpringMVC绑定参数之类型转换有三种方式:
1. 实体类中加日期格式化注解
@DateTimeFormat(pattern="yyyy-MM-dd hh:MM") private Date creationTime;
2.在Controller类的方法中加入一段代码
/** * 在controller层中加入一段数据绑定代码 * @param webDataBinder */ @InitBinder public void initBinder(WebDataBinder webDataBinder) throws Exception{ SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm"); simpleDateFormat.setLenient(false); webDataBinder.registerCustomEditor(Date.class , new CustomDateEditor(simpleDateFormat , true)); }
备注:自定义类型转换器必须实现PropertyEditor接口或者继承PropertyEditorSupport类
写一个类 extends propertyEditorSupport(implements PropertyEditor){ public void setAsText(String text){ SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy -MM-dd hh:mm"); Date date = simpleDateFormat.parse(text); this.setValue(date); } public String getAsTest(){ Date date = (Date)this.getValue(); return this.dateFormat.format(date); } }
3.(spring 3.0以前使用正常,以后的版本需要使用< mvc:annotation-driven/>注册使用)使用xml配置实现类型转换(系统全局转换器)
1.注册conversionservice
<!-- 注册ConversionService--> <bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean"> <property name="converters"> <set> <bean class="com.ezubo.global.portal.util.StringToDateConverter"> <constructor-arg index="0" value="yyyy-MM-dd hh:mm"/> </bean> </set> </property> </bean>
备注:StringtoDateConverter.java的实现:
/** * Created by 苏 on 15-10-13. */ public class StringToDateConverter implements Converter<String,Date> { private static final Logger logger = LoggerFactory.getLogger(StringToDateConverter.class); private String pattern; public StringToDateConverter(String pattern){ this.pattern = pattern; } public Date convert(String s) { if(StringUtils.isBlank(s)){ return null; } SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern); simpleDateFormat.setLenient(false); try{ return simpleDateFormat.parse(s); }catch(ParseException e){ logger.error("转换日期异常:"+e.getMessage() , e); throw new IllegalArgumentException("转换日期异常:"+e.getMessage() , e); } } }
2.使用 ConfigurableWebBindingInitializer 注册conversionService
<!--使用 ConfigurableWebBindingInitializer 注册conversionService--> <bean id="webBindingInitializer" class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer"> <property name="conversionService" ref="conversionService"/> </bean>
3.注册ConfigurableWebBindingInitializer到RequestMappingHandlerAdapter
<!-- 注册ConfigurableWebBindingInitializer 到RequestMappingHandlerAdapter--> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"> <property name="webBindingInitializer" ref="webBindingInitializer"/> <!-- 线程安全的访问session--> <property name="synchronizeOnSession" value="true"/> </bean>
此时可能有人会问,如果我同时使用 PropertyEditor 和 ConversionService,执行顺序是什么呢?内部首先查找PropertyEditor 进行类型转换,如果没有找到相应的 PropertyEditor 再通过 ConversionService进行转换。
4.(spring 3.2以后使用正常)使用<mvc:annotation-driven/>注册conversionService
具体原因请参考:
SpringMVC配置全局日期转换器,处理日期转换异常
1.注册ConversionService
<!-- 注册ConversionService--> <bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean"> <property name="converters"> <set> <bean class="com.ezubo.global.portal.util.StringToDateConverter"> <constructor-arg index="0" value="yyyy-MM-dd hh:mm"/> </bean> </set> </property> </bean>
2. 需要修改springmvc-servlet xml配置文件中的annotation-driven,增加属性conversion-service指向新增的 conversionService。
<mvc:annotation-driven conversion-service="conversionService"> <mvc:message-converters register-defaults="true"> <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> <property name="supportedMediaTypes" value="text/html;charset=UTF-8"/> <!--转换时设置特性--> <property name="features"> <array> <!--避免默认的循环引用替换--> <ref bean="DisableCircularReferenceDetect"/> <ref bean="WriteMapNullValue"/> <ref bean="WriteNullStringAsEmpty"/> <ref bean="WriteNullNumberAsZero"/> </array> </property> </bean> </mvc:message-converters> </mvc:annotation-driven>