SSM-SpringMVC-29:SpringMVC中InitBinder的初步

 

 

 ------------吾亦无他,唯手熟尔,谦卑若愚,好学若饥-------------

 

 

之前博客的配置日期类型转换器,他是全局的,如果只是一个处理器中使用怎么办?

引出@InitBinder注解

 

 

案例:

  1.在处理器中:

package cn.dawn.day22initbinder;

import org.springframework.beans.propertyeditors.CustomDateEditor;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.RequestMapping;

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

/**
 * Created by Dawn on 2018/3/31.
 */

@Controller
public class FirstController {
    /*第一种*/
    /*@InitBinder*/
    /*第二种*/
    @InitBinder("birthday")
    public void initBinder(WebDataBinder binder){
        System.out.println("1111111111");
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
        binder.registerCustomEditor(Date.class,new CustomDateEditor(sdf,true));
    }


    /*initbinder*/
    @RequestMapping("/initbinderFirst")
    public String initbinderFirst(String username, Integer userage, Date birthday) throws Exception {
        System.out.println("2222222222");
        System.out.println(username);
        System.out.println(userage);
        System.out.println(birthday);
        return "success";
    }
}

  此处需要重点解释一波,这样就可以日期类型转换器变成局部的了,俩个方法执行顺序正如输出的那样一个是1,一个是2,@InitBinder注解它加参数是说只匹配birthday,如果不加,下面那个方法有三个参数,上面的方法就执行三次,System.out.print("11111111")三次

 

  2.自己的xml配置文件:

<?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: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/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd">

    <!--包扫描器-->
    <context:component-scan base-package="cn.dawn.day22initbinder"></context:component-scan>
    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/day22/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>


</beans>

 

  3.修改web.xml配置文件的中央调度器的上下问配置位置为上面的那个xml

  4.jsp页面:

    4.1login.jsp

 

<%@ page  pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"  %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h2>登录</h2>
<form action="${pageContext.request.contextPath}/initbinderFirst" method="post">

    用户名:<input name="username" value="${username}">
    年龄:<input name="userage">
    生日:<input name="birthday">

    <input type="submit" value="登录"/>
</form>
</body>
</html>

 

 

    4.2success.jsp页面

 

<%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %>
<html>
<body>
<%--<img src="image/1.jpg">--%>
<h2>Success!</h2>
</body>
</html>

 

 

 

  5.启动tomcat,访问login.jsp,发现只有yyyy-MM-dd可以转换成功,说明它已经和springmvc默认的不同了,同样的问题,兼容性不好,所以,下一篇博客为大家做进一步的优化

 

posted @ 2018-03-31 20:29  晨曦Dawn  阅读(233)  评论(0编辑  收藏  举报