springmvc conver_代码,无分析

 

这种情况:

如果request参数是String类型,但是Controller的入参需要Date类型, 这种情况就需要Converter:

 

 

代码:

HiConverter:

请求路径:

http://localhost:8080/mvc/date?myDate=2020-11-22

@Controller
public class HiController {

    @RequestMapping("/date")
    @ResponseBody
    public String getDate(Date myDate) {
        return myDate.toString();
    }
}
MyDateConverter:
public class MyDateConverter implements Converter<String, Date> {
  
    @Override
    public Date convert(String s) {
        SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-DD");
        Date date = null;
        try {
            date = sdf.parse(s);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return date;
    }
}

springMVC.xml:

    <!-- 配置器转换 -->
    <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
        <property name="converters">
            <list>
                <bean class="com.springmvc.converter.MyDateConverter" />
            </list>
        </property>
    </bean>
    <!-- 加载注解驱动 -->
    <mvc:annotation-driven conversion-service="conversionService"/>

 

结果:

 

 

 

 

注:

// S - source, T - to
@FunctionalInterface
public interface Converter<S, T> {
    @Nullable
    T convert(S var1);
}

 

posted @ 2020-10-24 11:33  圣金巫灵  阅读(164)  评论(0编辑  收藏  举报