------------吾亦无他,唯手熟尔，谦卑若愚，好学若饥-------------
例子很简易，要明白的是思路，话不多说，开讲
上篇博客不是说springmvc默认的日期转换格式是yyyy/MM/dd吗?如果我们要别的格式怎么办？(例如yyyyMMdd,yyyy-MM-dd,yyyy年MM月dd日)就用到了自定义日期类型转换器
案例：
1.自定义类型转换器，实现泛型接口Converter
package cn.dawn.day20selfconverter.converter;
import org.springframework.core.convert.converter.Converter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Pattern;
/**
* Created by Dawn on 2018/3/30.
*/
/*实现泛型接口，String是传进来的字符串，Date是要返回的日期类型*/
public class MyDateConverter implements Converter<String,Date> {
public Date convert(String str) {
/*获取下面方法返回的SimoleDateFormat*/
SimpleDateFormat sdf=getSimpleDate(str);
try {
/*转换Date类型后返回*/
return sdf.parse(str);
} catch (ParseException e) {
e.printStackTrace();
}
return null;
}
/*根据字符串的格式自定义转换的格式*/
private SimpleDateFormat getSimpleDate(String str) {
SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日");
if(Pattern.matches("^\\d{4}-\\d{1,2}-\\d{2}$",str)){
sdf=new SimpleDateFormat("yyyy-MM-dd");
}
if(Pattern.matches("^\\d{4}/\\d{1,2}/\\d{2}$",str)){
sdf=new SimpleDateFormat("yyyy/MM/dd");
}
if(Pattern.matches("^\\d{4}\\d{1,2}\\d{2}$",str)){
sdf=new SimpleDateFormat("yyyyMMdd");
}
return sdf;
}
}
2.自定义处理器和处理方法
package cn.dawn.day20selfconverter;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import java.util.Date;
/**
* Created by Dawn on 2018/3/28.
*/
@Controller
public class TypeConverterController {
/*作用于这俩个*/
@ExceptionHandler
public ModelAndView resolveException(Exception ex, HttpServletRequest request) {
ModelAndView modelAndView=new ModelAndView();
/*给username回显*/
modelAndView.addObject("username",request.getParameter("username"));
/*返回的异常对象*/
modelAndView.addObject("ex",ex);
/*发生异常返回登陆页*/
modelAndView.setViewName("login");
return modelAndView;
}
/*做日期类型自定义*/
@RequestMapping("/dateconverter2")
public String dateconverter1(String username, Integer userage, Date birthday) throws Exception {
System.out.println(username);
System.out.println(userage);
System.out.println(birthday);
return "success";
}
}
3.自定义xml大配置文件
<?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.day20selfconverter"></context:component-scan>
<!--视图解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/day20/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
4.修改web.xml中央调度器的上下文配置位置
5.jsp页面：
5.1login.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}/dateconverter2" 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>
5.2success.jsp
<%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %>
<html>
<body>
<%--<img src="image/1.jpg">--%>
<h2>Success!</h2>
</body>
</html>
6.启动tomcat，访问login.jsp
