SpringMVC自定義型別轉換器實現解析
這篇文章主要介紹了SpringMVC自定義型別轉換器實現解析,文中通過示例程式碼介紹的非常詳細,對大家的學習或者工作具有一定的參考學習價值,需要的朋友可以參考下
頁面錄入的字串:2019/12/05可以對映到實體的日期屬性上,但是如果是錄入2019-12-05就會報錯400 bad request,想要以2019-12-05日期格式的方式對映到實體的日期屬性上,需要自定義型別轉換器,主要步驟如下:
1、 自定義類實現Convertro<S,T>介面
2、Springmvc.xml中配置ConversionServiceFactoryBean,其屬性上配置我們自定義的轉換器
3、欲使配置的轉換器生效,需要將springmvc.xml的<mvc:annotation-driven />改為
<mvc:annotation-driven conversion-service="conversionServiceFactoryBean"/>
1、 自定義類實現Convertro<S,T>介面
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("日期字串不能為空!"); } DateFormat df = new SimpleDateFormat("yyyy-MM-dd"); try { return df.parse(s); } catch (ParseException e) { throw new RuntimeException("型別轉換出錯!"); } } }
2、Springmvc.xml中配置ConversionServiceFactoryBean,其屬性上配置我們自定義的轉換器
<!--配置自定義型別轉換器--> <bean id="conversionServiceFactoryBean" class="org.springframework.context.support.ConversionServiceFactoryBean"> <property name="converters"> <set> <bean class="com.example.util.StingToDateConvertr" /> </set> </property> </bean>
3、欲使配置的轉換器生效,需要將springmvc.xml的<mvc:annotation-driven />改為
<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 "> <!--開啟註解掃描--> <context:component-scan base-package="com.example" /> <!--檢視解析器,根據Controller返回的字串找對應的檔案--> <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!--檔案路徑--> <property name="prefix" value="/WEB-INF/pages/" /> <!--檔案字尾--> <property name="suffix" value=".jsp" /> </bean> <!--配置自定義型別轉換器--> <bean id="conversionServiceFactoryBean" class="org.springframework.context.support.ConversionServiceFactoryBean"> <property name="converters"> <set> <bean class="com.example.util.StingToDateConvertr" /> </set> </property> </bean> <!--1、開啟springmvc框架註解的支援--> <!--2、欲使配置的自定義型別轉換器生效,需加上conversion-service屬性--> <mvc:annotation-driven conversion-service="conversionServiceFactoryBean"/> </beans>
注意:自定義的型別轉換器生效之後,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格式就會報錯!
如有理解不到之處,望指正!
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