Spring MVC中ConversionService转换数据

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我是靠谱客的博主隐形自行车，这篇文章主要介绍Spring MVC中ConversionService转换数据，现在分享给大家，希望可以做个参考。

一视图

1 registerForm.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>测试ConversionService</title>
</head>
<body>
<h3>注册页面</h3>
<form action="register" method="post">
     <table>
         <tr>
            <td><label>登录名: </label></td>
             <td><input type="text" id="loginname"  name="loginname" ></td>
         </tr>
          <tr>
            <td><label>生日: </label></td>
             <td><input type="text" id="birthday" name="birthday"  ></td>
         </tr>
         <tr>
             <td><input id="submit" type="submit" value="登录"></td>
         </tr>
     </table>
</form>
</body>
</html>

2 success.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<!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=UTF-8">
<title>测试ConversionService</title>
</head>
<body>
登录名：${requestScope.user.loginname }
生日：<fmt:formatDate value="${requestScope.user.birthday}"
     pattern="yyyy年MM月dd日"/>
</body>
</html>

二领域模型

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package org.fkit.domain;

import java.io.Serializable;
import java.util.Date;

// 域对象，实现序列化接口
public class User implements Serializable{
    
    private static final long serialVersionUID = 1L;
    
    private String loginname;
    private Date birthday;

    public User() {
        super();
        // TODO Auto-generated constructor stub
    }

    public String getLoginname() {
        return loginname;
    }

    public void setLoginname(String loginname) {
        this.loginname = loginname;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    @Override
    public String toString() {
        return "User [loginname=" + loginname + ", birthday=" + birthday + "]";
    }
}

三转换器

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package org.fkit.converter;

import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.core.convert.converter.Converter;


// 实现Converter<S,T>接口
public class StringToDateConverter implements Converter<String, Date>{

    // 日期类型模板：如yyyy-MM-dd
    private String datePattern;
    
    public void setDatePattern(String datePattern) {
        this.datePattern = datePattern;
    }

    // Converter<S,T>接口的类型转换方法
    @Override
    public Date convert(String date) {
        try {
            SimpleDateFormat dateFormat = new SimpleDateFormat(this.datePattern);
            // 将日期字符串转换成Date类型返回
            return dateFormat.parse(date);
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("日期转换失败!");
            return null;
        }
        
    }

}

四控制器

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package org.fkit.controller;


import org.fkit.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;



@Controller
public class UserController{
     
    @GetMapping(value="/registerForm")
     public String registerForm(){
        // 跳转到注册页面
        return "registerForm";
    }
     
     @PostMapping(value="/register")
     public String register(
             @ModelAttribute User user,
             Model model) {
         System.out.println(user);
         model.addAttribute("user", user);
         return "success";
     }

}

五配置文件

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<?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:p="http://www.springframework.org/schema/p"
    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="org.fkit.controller"></context:component-scan>
     
    <mvc:default-servlet-handler></mvc:default-servlet-handler>
    
    
    <mvc:annotation-driven  conversion-service="conversionService"></mvc:annotation-driven>
    
    
     <bean id="conversionService"
      class="org.springframework.context.support.ConversionServiceFactoryBean">
      <property name="converters">
           <list>
                <bean  class="org.fkit.converter.StringToDateConverter"
                p:datePattern="yyyy-MM-dd"></bean>
           </list>
      </property>
    </bean>
    
    
     <bean id="viewResolver"
           class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          p:prefix="/WEB-INF/content/" p:suffix=".jsp"></bean>
    
</beans>

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<?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:p="http://www.springframework.org/schema/p"
    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">
        
    <!-- spring可以自动去扫描base-pack下面的包或者子包下面的java文件，
      如果扫描到有Spring的相关注解的类，则把这些类注册为Spring的bean  -->
    <context:component-scan base-package="org.fkit.controller"/>
     <!-- 静态资源处理 -->
    <mvc:default-servlet-handler/>
    
    <!-- 装配自定义的类型转换器 -->
    <mvc:annotation-driven  conversion-service="conversionService"/>
    
    <!-- 自定义的类型转换器 -->
     <bean id="conversionService"
      class="org.springframework.context.support.ConversionServiceFactoryBean">
      <property name="converters">
           <list>
                <bean  class="org.fkit.converter.StringToDateConverter"
                p:datePattern="yyyy-MM-dd"></bean>
           </list>
      </property>
    </bean>
    
    <!-- 视图解析器  p:prefix属性表示前缀  p:suffix 表示后缀  -->
     <bean id="viewResolver"
           class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          p:prefix="/WEB-INF/content/" p:suffix=".jsp"/>
    
</beans>