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SpringMVC内部有类型转换器,当从Request中获取参数后,放入Controller中时,会根据Controller中指定的类型进行自动转换,当指的类型SpringMVC不能自动转换时,就需要自定义类转换器
项目目录树:
请求页面index.jsp
<%@ page language="java" contentType="text/html; charset=GBK"
pageEncoding="GBK"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<base href="<%=basePath %>">
<title>IndexPage</title>
</head>
<body>
<c:out value="${ex.message }"></c:out>
<form action="converter/converter">
name: <input type="text" name="name"><br>
age: <input type="text" name="age"><br>
Date: <input type="text" name="date"><br>
<input type="submit" value="submit">
</form>
</body>
</html>
控制器ConverterController.java
package com.orange.controller;
import java.util.Date;
import javax.servlet.http.HttpServletRequest;
import org.springframework.beans.TypeMismatchException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
@RequestMapping(value="/converter")
public class ConverterController {
@RequestMapping(value="/converter")
public ModelAndView doConverter(String name, int age, Date date, ModelAndView mav){
mav.addObject("name", name);
mav.addObject("age", age);
mav.addObject("date", date);
mav.setViewName("/showConverter.jsp");
return mav;
}
//注释式异常处理方式,当发生类型转换异常时,必须使用注解式异常处理,应该该异常在进入Controller之前就已经发生
@ExceptionHandler(value=TypeMismatchException.class)
public ModelAndView exceptionResolver(Exception ex, HttpServletRequest request){
ModelAndView mav = new ModelAndView();
mav.addObject("ex", ex);
mav.setViewName("/index.jsp");
return mav;
}
}
自定义类型转换器
package com.orange.converter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Pattern;
import org.springframework.core.convert.converter.Converter;
public class MyDateConverter implements Converter<String, Date> {
public Date convert(String source) {
try {
SimpleDateFormat sdf = getSimpleDateFormat(source);
return sdf.parse(source);
} catch (ParseException e) {
e.printStackTrace();
}
return null;
}
private SimpleDateFormat getSimpleDateFormat(String source){
SimpleDateFormat sdf = null;
if(Pattern.matches("^\\d{4}-\\d{2}-\\d{2}$", source)){
sdf = new SimpleDateFormat("yyyy-MM-dd");
}else if(Pattern.matches("^\\d{4}\\d{2}\\d{2}$", source)){
sdf = new SimpleDateFormat("yyyyMMdd");
}else if(Pattern.matches("^\\d{4}/\\d{2}/\\d{2}$", source)){
sdf = new SimpleDateFormat("yyyy/MM/dd");
}
return sdf;
}
}
注册类型转换器,配置spring-mvc.xml
<?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/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<!-- 扫描注解 -->
<context:component-scan base-package="com.orange.controller" />
<!-- 开启类型转换服务 -->
<mvc:annotation-driven conversion-service="conversionService"/>
<!-- 注册自定义类型转换器 -->
<bean id="dateConverter" class="com.orange.converter.MyDateConverter"></bean>
<!-- 注册类型转换服务 -->
<bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
<property name="converters" ref="dateConverter"></property>
</bean>
</beans>
跳转后的页面showConverter.jsp
<%@ page language="java" contentType="text/html; charset=GBK"
pageEncoding="GBK"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<base href="<%=basePath %>">
<title>showController Page</title>
</head>
<body>
<c:out value="${name }"></c:out><br>
<c:out value="${age }"></c:out>
<c:out value="${date }"></c:out>
</body>
</html>
当输入信息正确时
当输入格式不支持时(自定义类型转换器支持yyyy-MM-dd,yyyyMMMdd,yyyy/MM/dd)
可以把异常信息展示到输入的页面 | 
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发表于 2021-5-16 10:58:08