SpringMVC自定义类型转换器实现解析
这篇文章主要介绍了SpringMVC自定义类型转换器实现解析,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
页面录入的字符串:2019/12/05可以映射到实体的日期属性上,但是如果是录入2019-12-05就会报错400 bad request,想要以2019-12-05日期格式的方式映射到实体的日期属性上,需要自定义类型转换器,主要步骤如下:
1、 自定义类实现Convertro<S,T>接口
2、Springmvc.xml中配置ConversionServiceFactoryBean,其属性上配置我们自定义的转换器
3、欲使配置的转换器生效,需要将springmvc.xml的<mvc:annotation-driven />改为
<mvc:annotation-driven conversion-service="conversionServiceFactoryBean"/>
1、 自定义类实现Convertro<S,T>接口
package com.example.util; import org.springframework.core.convert.converter.Converter; import org.springframework.util.StringUtils; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class StingToDateConvertr implements Converter<String, Date> { @Override public Date convert(String s) { if(StringUtils.isEmpty(s)){ throw new RuntimeException("日期字符串不能为空!"); } DateFormat df = new SimpleDateFormat("yyyy-MM-dd"); try { return df.parse(s); } catch (ParseException e) { throw new RuntimeException("类型转换出错!"); } } }
2、Springmvc.xml中配置ConversionServiceFactoryBean,其属性上配置我们自定义的转换器
<!--配置自定义类型转换器--> <bean id="conversionServiceFactoryBean" class="org.springframework.context.support.ConversionServiceFactoryBean"> <property name="converters"> <set> <bean class="com.example.util.StingToDateConvertr" /> </set> </property> </bean>
3、欲使配置的转换器生效,需要将springmvc.xml的<mvc:annotation-driven />改为
<mvc:annotation-driven conversion-service="conversionServiceFactoryBean"/>
springmvc.xml的完整配置如下:
<?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:aop="http://www.springframework.org/schema/aop" xmlns:c="http://www.springframework.org/schema/c" xmlns:cache="http://www.springframework.org/schema/cache" xmlns:context="http://www.springframework.org/schema/context" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee" xmlns:lang="http://www.springframework.org/schema/lang" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:p="http://www.springframework.org/schema/p" xmlns:task="http://www.springframework.org/schema/task" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.3.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.3.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-4.3.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.3.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-4.3.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd "> <!--开启注解扫描--> <context:component-scan base-package="com.example" /> <!--视图解析器,根据Controller返回的字符串找对应的文件--> <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!--文件路径--> <property name="prefix" value="/WEB-INF/pages/" /> <!--文件后缀--> <property name="suffix" value=".jsp" /> </bean> <!--配置自定义类型转换器--> <bean id="conversionServiceFactoryBean" class="org.springframework.context.support.ConversionServiceFactoryBean"> <property name="converters"> <set> <bean class="com.example.util.StingToDateConvertr" /> </set> </property> </bean> <!--1、开启springmvc框架注解的支持--> <!--2、欲使配置的自定义类型转换器生效,需加上conversion-service属性--> <mvc:annotation-driven conversion-service="conversionServiceFactoryBean"/> </beans>
注意:自定义的类型转换器生效之后,日期格式就只能使用yyyy-MM-dd的格式了,若再使用原有的yyyy/MM/dd格式就会报错!
如有理解不到之处,望指正!
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