SpringMVC09 Converter变流器、数据回显、异常测试

　　1.配置web.xml文件

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
    <display-name>Archetype Created Web Application</display-name>
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

　　2.自定义日期变流器

import org.springframework.beans.TypeMismatchException;
import org.springframework.core.convert.converter.Converter;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Pattern;
//converter<String,Date> Converter<S,T> S:Source　　T：Target；
public class MyDateConverter implements Converter<String, Date> {
    public DateFormat getDateFormat(String str) {
        DateFormat sdf = null;
        //str 2017/08/20 str 2017-08-20 str 2017年08月20日
        //模式匹配 正则 元字符 （用来匹配用的 或者 限定用的）
        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}年\d{2}月\d{2}日$", str)) {
            //这里是中文字符，所以要在web.xml里配置filter来一定编码格式UTF-8
            sdf = new SimpleDateFormat("yyyy年MM月dd日");
        } else {
            throw new TypeMismatchException("", Date.class);　　　　//异常抛出
        }
        return sdf;
    }
    public Date convert(String str) {
        //特定格式的字符串，转成日期
        DateFormat sdf = getDateFormat(str);
        try {
            Date date = sdf.parse(str);
            return date;
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }
}

　　3.日期格式处理器

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;
import java.util.Date;
@Controller
public class FirstController {
    @ExceptionHandler(TypeMismatchException.class)
    public ModelAndView resovleException(Exception ex) {
        System.out.println("111111111111111111");
        ModelAndView mv = new ModelAndView();
        if (ex instanceof TypeMismatchException) {
            mv.setViewName("/typeconverter.jsp");
        }
        //携带异常日志到页面
        mv.addObject("datamsg", ex.getMessage());
        return mv;
    }
    @RequestMapping("/first")
    //类型转化工作一定是在真正的handler方法执行前执行的
    public String doFirst(Date birthday, int age) throws Exception {
        System.out.println("222222222222222222222");
        System.out.println(birthday + "===========");
        System.out.println(age + "===============");
        return "/index.jsp";
    }
}

　　4.映射器

<?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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="cn.happy"/>

    <!--注册转换器-->
    <bean id="dateConverter" class="cn.happy.converter.MyDateConverter"/>

    <!--注册服务工厂-->
    <bean id="serviceFactory" class="org.springframework.context.support.ConversionServiceFactoryBean">
        <property name="converters" ref="dateConverter"/>
    </bean>

    <!--注册驱动去关联     注册服务工厂-->
    <mvc:annotation-driven conversion-service="serviceFactory"/>
</beans>

　　5.1：注册页面

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>类型转换</h1>
<form action="${pageContext.request.contextPath}/first" method="post">
    出生日期：<input name="birthday" value="${mydate}"/><span>${datamsg}</span><br/><br/>
    年龄：<input name="age" value="${age}"/><br/><br/>
    <input type="submit" value="注册"/>
</form>
</body>
</html>

　　5.2：成功页面

<html>
<body>
<h2>Hello World!</h2>
</body>
</html>

 　　测试结果1：

　　测试结果2：

　　测试结果3：

　　测试结果4：