自定義類型轉換器

一、建立自定義類型轉換器類

package com.ly.springmvc.converter;

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

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

public class StringToDateConverter implements Converter<String, Date> {
    @Override
    public Date convert(String s) {
        if(s == null) {
            return null;
        }
        s = s.trim();
        if("".equals(s)) {
            return null;
        }
        String pattern = "yyyy-MM-dd HH:mm:ss";
        if(s.length() == 10) {
            pattern = "yyyy-MM-dd";
        }
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        try {
            return sdf.parse(s);
        } catch (ParseException e) {
            e.printStackTrace();
            throw new RuntimeException("字符串格式非yyyy-MM-dd HH:mm:ss");
        }
    }
}

 

二、在springmvc配置文件中註冊自定義類型轉換器

    <!--自定義類型轉換器-->
    <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
        <property name="converters">
            <set>
                <bean class="com.ly.springmvc.converter.StringToDateConverter"></bean>
            </set>
        </property>
    </bean>

 

三、在springmvc配置文件中配置自定義類型轉換器生效

 

    <!--啓SpringMVC的註解驅動模式-->
    <!--conversion-service 配置自定義類型轉換器生效-->
    <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven>

四、請求

<form action="param/test1" method="post">
    userName:<input type="text" name="userName"><br>
    age:<input type="text" name="age"><br>
    birthday:<input type="text" name="birthday"><br>
    <input type="submit" name="提交">
</form>

五、處理方法

    @RequestMapping("/param/test1")
    public String testParam6(User u) {
        System.out.println("testParam6");
        System.out.println(u);
        return "success";
    }

六、總結

6.一、springmvc中String類型轉爲Date類型默認的格式是年月日之間用/分隔