SpringMVC中的自定义参数绑定案例
由于日期数据有很多种格式,所以springmvc没办法把字符串转换成日期类型。所以需要自定义参数绑定。前端控制器接收到请求后,找到注解形式的处理器适配器,对RequestMapping标记的方法进行适配,并对方法中的形参进行参数绑定。在springmvc这可以在处理器适配器上自定义Converter进行参数绑定。如果使用<mvc:annotation-driven/>可以在此标签上进行扩展。
步骤:自定义Converter
public class DateConverter implements Converter<String, Date> {
//String (原数据的类型),Date(转换后的数据类型)
@Override
public Date convert(String source) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
return simpleDateFormat.parse(source);
} catch (ParseException e) {
e.printStackTrace();
}
return null;
}
}
配置Converter(在springmvc的主配置文件中配置)
<!-- 加载注解驱动 -->
<mvc:annotation-driven conversion-service="conversionService"/>
<!-- 转换器配置 -->
<bean id="conversionService"
class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
<property name="converters">
<set>
<bean class="cn.kingdee.springmvc.convert.DateConverter"/>
</set>
</property>
</bean>
配置方式2(了解)
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<!-- 扫描带Controller注解的类 -->
<context:component-scan base-package="cn.itcast.springmvc.controller" />
<!-- 转换器配置 -->
<bean id="conversionService"
class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
<property name="converters">
<set>
<bean class="cn.kingdee.springmvc.convert.DateConverter"/>
</set>
</property>
</bean>
<!-- 自定义webBinder -->
<bean id="customBinder" class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
<property name="conversionService" ref="conversionService" />
</bean>
<!--处理器适配器 -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="webBindingInitializer" ref="customBinder"></property>
</bean>
<!-- 注解处理器映射器 -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
<!-- 加载注解驱动 -->
<!-- <mvc:annotation-driven/> -->
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<!-- jsp前缀 -->
<property name="prefix" value="/WEB-INF/jsp/" />
<!-- jsp后缀 -->
<property name="suffix" value=".jsp" />
</bean>
</beans>