为什么页面上输入‘12’，可以复制给Handler方法对应的参数？
和是因为类型转换器并不是可以将用户提交的String，转换为用户需要的所有类型，此时，就需要自定义类型转换器可
案例：自定义日期类型转换器 要求格式：yyyy/MM/dd
页面上：
<%-- Created by IntelliJ IDEA. User: mycom Date: 2018/3/26 Time: 11:57 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>Title</title> </head> <body> <h2>登录</h2> <form action="${pageContext.request.contextPath}/first" method="post"> 用户名：<input type="text" name="name" value="${name}"/> 年龄：<input type="text" name="age" value="${age}"/> 出生日期:<input type="text" name="birthday"/> <input type="submit" value="提交"> </form> </body> </html>
控制器类
package demo16TypeConverter; 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 mycom on 2018/3/30. */ @Controller public class TypeController { @ExceptionHandler public ModelAndView doSome(Exception ex, HttpServletRequest request){ ModelAndView mv=new ModelAndView(); mv.addObject("name",request.getAttribute("name")); mv.setViewName("login"); mv.addObject("ex",ex);//保存的数据，在页面上用EL表达式展示错误信息 //判断异常类型 if(ex instanceof NameException){ mv.setViewName("nameException"); } if(ex instanceof AgeException){ mv.setViewName("ageException"); } return mv; } @RequestMapping("/first") public String doFirst(String name, int age, Date birthday){ System.out.println(name); System.out.println(age); System.out.println(birthday); return "success"; } }
配置文件中
<?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"> <context:component-scan base-package="demo16TypeConverter"></context:component-scan> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/error/"></property> <property name="suffix" value=".jsp"></property> </bean> <!--配置自定义的转换器--> <bean id="MyConverter" class="demo16TypeConverter.MyConverter"></bean> <!--注册一个转换器--> <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean"> <property name="converters" ref="MyConverter"></property> </bean> <!--注解驱动--> <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven> </beans>
自定义类型转化器
package demo16TypeConverter; 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 mycom on 2018/3/30. */ public class MyConverter implements Converter<String,Date> { public Date convert(String str) { SimpleDateFormat sdf=getConverter(str); try { Date date=sdf.parse(str); return date; } catch (ParseException e) { e.printStackTrace(); } return null; } private SimpleDateFormat getConverter(String str) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");
//匹配不同的格式 if(Pattern.matches("^\\d{4}-\\d{2}-\\d{2}$",str)){ sdf = new SimpleDateFormat("yyyy-MM-dd"); }else if(Pattern.matches("^\\d{4}/\\d{2}/\\d{2}$",str)){ sdf = new SimpleDateFormat("yyyy/MM/dd"); }else if(Pattern.matches("^\\d{4}\\d{2}\\d{2}$",str)){ sdf = new SimpleDateFormat("yyyyMMdd"); } return sdf; } }
配置文件和页面还是使用的上面的一种