释放双眼，带上耳机，听听看~！
** ————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
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2
3import org.springframework.core.convert.converter.Converter;
4
5import java.text.ParseException;
6import java.text.SimpleDateFormat;
7import java.util.Date;
8import java.util.regex.Pattern;
9
10/**
11 * Created by Dawn on 2018/3/30.
12 */
13/*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*/
14public class MyDateConverter implements Converter<String,Date> {
15 public Date convert(String str) {
16 /*获取下面方法返回的SimoleDateFormat*/
17 SimpleDateFormat sdf=getSimpleDate(str);
18 try {
19 /*转换Date类型后返回*/
20 return sdf.parse(str);
21 } catch (ParseException e) {
22 e.printStackTrace();
23 }
24 return null;
25 }
26
27 /*根据字符串的格式自定义转换的格式*/
28 private SimpleDateFormat getSimpleDate(String str) {
29 SimpleDateFormat sdf=new SimpleDateFormat("yyyy年MM月dd日");
30 if(Pattern.matches("^\\d{4}-\\d{1,2}-\\d{2}$",str)){
31 sdf=new SimpleDateFormat("yyyy-MM-dd");
32 }
33 if(Pattern.matches("^\\d{4}/\\d{1,2}/\\d{2}$",str)){
34 sdf=new SimpleDateFormat("yyyy/MM/dd");
35 }
36 if(Pattern.matches("^\\d{4}\\d{1,2}\\d{2}$",str)){
37 sdf=new SimpleDateFormat("yyyyMMdd");
38 }
39 return sdf;
40 }
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42
43}
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2.自定义处理器和处理方法
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2
3import org.springframework.stereotype.Controller;
4import org.springframework.web.bind.annotation.ExceptionHandler;
5import org.springframework.web.bind.annotation.RequestMapping;
6import org.springframework.web.servlet.ModelAndView;
7
8import javax.servlet.http.HttpServletRequest;
9import java.util.Date;
10
11/**
12 * Created by Dawn on 2018/3/28.
13 */
14@Controller
15public class TypeConverterController {
16
17
18 /*作用于这俩个*/
19 @ExceptionHandler
20 public ModelAndView resolveException(Exception ex, HttpServletRequest request) {
21 ModelAndView modelAndView=new ModelAndView();
22 /*给username回显*/
23 modelAndView.addObject("username",request.getParameter("username"));
24 /*返回的异常对象*/
25 modelAndView.addObject("ex",ex);
26 /*发生异常返回登陆页*/
27 modelAndView.setViewName("login");
28
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30 return modelAndView;
31 }
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35
36 /*做日期类型自定义*/
37 @RequestMapping("/dateconverter2")
38 public String dateconverter1(String username, Integer userage, Date birthday) throws Exception {
39 System.out.println(username);
40 System.out.println(userage);
41 System.out.println(birthday);
42 return "success";
43 }
44}
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3.自定义xml大配置文件
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2<beans xmlns="http://www.springframework.org/schema/beans"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xmlns:mvc="http://www.springframework.org/schema/mvc"
5 xmlns:context="http://www.springframework.org/schema/context"
6 xsi:schemaLocation="http://www.springframework.org/schema/beans
7 http://www.springframework.org/schema/beans/spring-beans.xsd
8 http://www.springframework.org/schema/mvc
9 http://www.springframework.org/schema/mvc/spring-mvc.xsd
10 http://www.springframework.org/schema/context
11 http://www.springframework.org/schema/context/spring-context.xsd">
12
13 <!--包扫描器-->
14 <context:component-scan base-package="cn.dawn.day20selfconverter"></context:component-scan>
15 <!--视图解析器-->
16 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
17 <property name="prefix" value="/day20/"></property>
18 <property name="suffix" value=".jsp"></property>
19 </bean>
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21
22</beans>
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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
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2<html>
3<head>
4 <title>Title</title>
5</head>
6<body>
7<h2>登录</h2>
8<form action="${pageContext.request.contextPath}/dateconverter2" method="post">
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10 用户名:<input name="username" value="${username}">
11 年龄:<input name="userage">
12 生日:<input name="birthday">
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14 <input type="submit" value="登录"/>
15</form>
16</body>
17</html>
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5.2success.jsp
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2<html>
3<body>
4<%--<img src="image/1.jpg">--%>
5<h2>Success!</h2>
6</body>
7</html>
8
6.启动tomcat，访问login.jsp
