Springmvc框架-数据转换与格式化（一）

Springmvc框架数据绑定核心流程。

 

 现在实现一个需求：

编写一个自定义的转换器　，自定义转换规则，实现日期格式的转换。

在tools包下面创造StringToDateConvertor转化器类

package cn.smbms.tools;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.core.convert.converter.Converter;

//创建一个自定义的时间日期格式转换器
public class StringToDateConvertor implements Converter<String, Date>{
//创建一个构造器
    private String datePattern;
    public StringToDateConvertor(String dataPattern){
        this.datePattern=dataPattern;//dataPattern等于传递过来的dataPattern
    }
    //具体的转换方法
    @Override
    public Date convert(String time) {
        Date date=null;
        try {
            date=new SimpleDateFormat(datePattern).parse(time);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return date;
    }

}

Springmvc-servlet.xml

<?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:mvc="http://www.springframework.org/schema/mvc"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
        
    <context:component-scan base-package="cn.smbms.controller"/>    
    <!-- 指定mvc:annotation-driven的默认实现，现在使用的是自己自定义的转化器 -->
    <mvc:annotation-driven conversion-service="myConversionService">
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>application/json;charset=UTF-8</value>
                    </list>
                </property>
            </bean> 
            <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/html;charset=UTF-8</value>
                        <value>application/json</value>
                    </list>
                </property>
                <property name="features">
                    <list>
                      <!--  Date的日期转换器 -->
                      <value>WriteDateUseDateFormat</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>
    <!--创建conversionService实例  当我们在遇到前后台日期类型转换的问题的时候，其实有mvc:annotation-driven一键式配置好了，所以conversionService实例不用也是可以的-->
   <!--  <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean"></bean> -->
   
   <!-- 引用自己自定义的转化器 -->
   <bean id="myConversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
       <property name="converters">
           <list>
               <bean class="cn.smbms.tools.StringToDateConvertor">
                  <!-- 构造注入 -->
                  <constructor-arg type="java.lang.String" value="yyyy-MM-dd"></constructor-arg>
               
               </bean>
           
           
           
           </list>
       
       
       </property>
   </bean>
   
    <mvc:resources mapping="/statics/**" location="/statics/" />
    <!-- 完成视图的对应 -->
    <!-- 对转向页面的路径解析。prefix：前缀， suffix：后缀 -->
    <!-- <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean> -->
    
    <!-- 配置多视图解析器：允许同样的内容数据呈现不同的view -->
    <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="favorParameter" value="true"/>
        <property name="defaultContentType" value="text/html"/>
        <property name="mediaTypes">
            <map>
                <entry key="html" value="text/html;charset=UTF-8"/>
                <entry key="json" value="application/json;charset=UTF-8"/>
                <entry key="xml" value="application/xml;charset=UTF-8"/>
            </map>
        </property>
        <!--配置网页的视图解析器  -->
        <property name="viewResolvers">
            <list>
                <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
                    <property name="prefix" value="/WEB-INF/jsp/"/>
                    <property name="suffix" value=".jsp"/>
                </bean>        
            </list>
        </property>
    </bean>
    
    <!--  全局异常处理 -->
    <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <props>
                <prop key="java.lang.RuntimeException">error</prop>
            </props>
        </property>
    </bean>
    
    <!-- 配置MultipartResolver，用于上传文件，使用spring的CommonsMultipartResolver -->  
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
            <property name="maxUploadSize" value="5000000"/>
            <property name="defaultEncoding" value="UTF-8"/>
    </bean>
    
</beans>

修改User.java类

 运行结果：