springmvc参数类型转换三种方式

SpringMVC绑定参数之类型转换有三种方式：

    1. 实体类中加日期格式化注解

   

@DateTimeFormat(pattern="yyyy-MM-dd hh:MM")
private Date creationTime;

    2.在Controller类的方法中加入一段代码

    /**
     * 在controller层中加入一段数据绑定代码
     * @param webDataBinder
     */
    @InitBinder
    public void initBinder(WebDataBinder webDataBinder) throws Exception{
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm");
        simpleDateFormat.setLenient(false);
        webDataBinder.registerCustomEditor(Date.class , new CustomDateEditor(simpleDateFormat , true));
    }

   备注：自定义类型转换器必须实现PropertyEditor接口或者继承PropertyEditorSupport类

写一个类 extends propertyEditorSupport（implements PropertyEditor）{
     public void setAsText(String text){
         SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy -MM-dd hh:mm");
        Date date = simpleDateFormat.parse(text);
        this.setValue(date);
     }
     public String getAsTest(){
      Date date = (Date)this.getValue(); 
      return this.dateFormat.format(date);
     }
}

   3.(spring 3.0以前使用正常，以后的版本需要使用< mvc:annotation-driven/>注册使用)使用xml配置实现类型转换(系统全局转换器)    1.注册conversionservice   

        <!-- 注册ConversionService-->
        <bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
            <property name="converters">
                <set>
                    <bean class="com.ezubo.global.portal.util.StringToDateConverter">
                        <constructor-arg index="0" value="yyyy-MM-dd hh:mm"/>
                    </bean>
                </set>
            </property>
        </bean>

 备注：StringtoDateConverter.java的实现：

/**
 * Created by 苏 on 15-10-13.
 */
public class StringToDateConverter implements Converter<String,Date> {

    private static final Logger logger = LoggerFactory.getLogger(StringToDateConverter.class);

    private String pattern;

    public StringToDateConverter(String pattern){
        this.pattern = pattern;
    }

    public Date convert(String s) {

        if(StringUtils.isBlank(s)){
            return null;
        }

        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
        simpleDateFormat.setLenient(false);
        try{
            return simpleDateFormat.parse(s);
        }catch(ParseException e){
            logger.error("转换日期异常："+e.getMessage() , e);
            throw new IllegalArgumentException("转换日期异常："+e.getMessage() , e);
        }
    }
}

   2.使用 ConfigurableWebBindingInitializer 注册conversionService

       <!--使用 ConfigurableWebBindingInitializer 注册conversionService-->
       <bean id="webBindingInitializer" class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
            <property name="conversionService" ref="conversionService"/>
       </bean>

 3.注册ConfigurableWebBindingInitializer到RequestMappingHandlerAdapter

       <!-- 注册ConfigurableWebBindingInitializer 到RequestMappingHandlerAdapter-->
       <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
            <property name="webBindingInitializer" ref="webBindingInitializer"/>
            <!-- 线程安全的访问session-->
            <property name="synchronizeOnSession" value="true"/>
       </bean>