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

 1 package cn.smbms.tools;
 2 
 3 import java.text.ParseException;
 4 import java.text.SimpleDateFormat;
 5 import java.util.Date;
 6 
 7 import org.springframework.core.convert.converter.Converter;
 8 
 9 //创建一个自定义的时间日期格式转换器
10 public class StringToDateConvertor implements Converter<String, Date>{
11 //创建一个构造器
12     private String datePattern;
13     public StringToDateConvertor(String dataPattern){
14         this.datePattern=dataPattern;//dataPattern等于传递过来的dataPattern
15     }
16     //具体的转换方法
17     @Override
18     public Date convert(String time) {
19         Date date=null;
20         try {
21             date=new SimpleDateFormat(datePattern).parse(time);
22         } catch (ParseException e) {
23             // TODO Auto-generated catch block
24             e.printStackTrace();
25         }
26         return date;
27     }
28 
29 }

Springmvc-servlet.xml

  1 <?xml version="1.0" encoding="UTF-8"?>
  2 <beans xmlns="http://www.springframework.org/schema/beans"
  3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4     xmlns:mvc="http://www.springframework.org/schema/mvc"
  5     xmlns:p="http://www.springframework.org/schema/p"
  6     xmlns:context="http://www.springframework.org/schema/context"
  7     xsi:schemaLocation="
  8         http://www.springframework.org/schema/beans
  9         http://www.springframework.org/schema/beans/spring-beans.xsd
 10         http://www.springframework.org/schema/context
 11         http://www.springframework.org/schema/context/spring-context.xsd
 12         http://www.springframework.org/schema/mvc
 13         http://www.springframework.org/schema/mvc/spring-mvc.xsd">
 14         
 15     <context:component-scan base-package="cn.smbms.controller"/>    
 16     <!-- 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 -->
 17     <mvc:annotation-driven conversion-service="myConversionService">
 18         <mvc:message-converters>
 19             <bean class="org.springframework.http.converter.StringHttpMessageConverter">
 20                 <property name="supportedMediaTypes">
 21                     <list>
 22                         <value>application/json;charset=UTF-8</value>
 23                     </list>
 24                 </property>
 25             </bean> 
 26             <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
 27                 <property name="supportedMediaTypes">
 28                     <list>
 29                         <value>text/html;charset=UTF-8</value>
 30                         <value>application/json</value>
 31                     </list>
 32                 </property>
 33                 <property name="features">
 34                     <list>
 35                       <!--  Date的日期转换器 -->
 36                       <value>WriteDateUseDateFormat</value>
 37                     </list>
 38                 </property>
 39             </bean>
 40         </mvc:message-converters>
 41     </mvc:annotation-driven>
 42     <!--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-->
 43    <!--  <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean"></bean> -->
 44    
 45    <!-- 引用自己自定义的转化器 -->
 46    <bean id="myConversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
 47        <property name="converters">
 48            <list>
 49                <bean class="cn.smbms.tools.StringToDateConvertor">
 50                   <!-- 构造注入 -->
 51                   <constructor-arg type="java.lang.String" value="yyyy-MM-dd"></constructor-arg>
 52                
 53                </bean>
 54            
 55            
 56            
 57            </list>
 58        
 59        
 60        </property>
 61    </bean>
 62    
 63     <mvc:resources mapping="/statics/**" location="/statics/" />
 64     <!-- 完成视图的对应 -->
 65     <!-- 对转向页面的路径解析。prefix：前缀， suffix：后缀 -->
 66     <!-- <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
 67         <property name="prefix" value="/WEB-INF/jsp/"/>
 68         <property name="suffix" value=".jsp"/>
 69     </bean> -->
 70     
 71     <!-- 配置多视图解析器：允许同样的内容数据呈现不同的view -->
 72     <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
 73         <property name="favorParameter" value="true"/>
 74         <property name="defaultContentType" value="text/html"/>
 75         <property name="mediaTypes">
 76             <map>
 77                 <entry key="html" value="text/html;charset=UTF-8"/>
 78                 <entry key="json" value="application/json;charset=UTF-8"/>
 79                 <entry key="xml" value="application/xml;charset=UTF-8"/>
 80             </map>
 81         </property>
 82         <!--配置网页的视图解析器  -->
 83         <property name="viewResolvers">
 84             <list>
 85                 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
 86                     <property name="prefix" value="/WEB-INF/jsp/"/>
 87                     <property name="suffix" value=".jsp"/>
 88                 </bean>        
 89             </list>
 90         </property>
 91     </bean>
 92     
 93     <!--  全局异常处理 -->
 94     <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
 95         <property name="exceptionMappings">
 96             <props>
 97                 <prop key="java.lang.RuntimeException">error</prop>
 98             </props>
 99         </property>
100     </bean>
101     
102     <!-- 配置MultipartResolver，用于上传文件，使用spring的CommonsMultipartResolver -->  
103     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
104             <property name="maxUploadSize" value="5000000"/>
105             <property name="defaultEncoding" value="UTF-8"/>
106     </bean>
107     
108 </beans>