Spring MVC使用Formatter格式化数据

Bertha 。 2021-07-24 12:40 321阅读 0赞

**一 格式化转换**

package org.fkit.formatter;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.Locale;
    import org.springframework.format.Formatter;
    
    // 实现Converter<S,T>接口
    public class DateFormatter implements Formatter<Date>{
    
        // 日期格式化对象
        private SimpleDateFormat dateFormat;
        
        // 构造器，通过依赖注入的日期类型创建日期格式化对象
        public DateFormatter(String datePattern) {
            this.dateFormat = new SimpleDateFormat(datePattern);
        }
    
        // 显示Formatter<T>的T类型对象
        @Override
        public String print(Date date, Locale locale) {
            return dateFormat.format(date);
        }
    
        // 解析文本字符串返回一个Formatter<T>的T类型对象。
        @Override
        public Date parse(String source, Locale locale) throws ParseException {
            try {
                return dateFormat.parse(source);
            } catch (Exception e) {
                throw new IllegalArgumentException();
            }
            
        }
    }

**二 领域模型**

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 控制器**

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";
         }
    
    }

**四 配置文件**

<?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:c="http://www.springframework.org/schema/c"
        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"/>
        
        <mvc:annotation-driven  conversion-service="conversionService"/>
         
        <mvc:default-servlet-handler/>
            
        
         <bean id="viewResolver"
               class="org.springframework.web.servlet.view.InternalResourceViewResolver"
              p:prefix="/WEB-INF/content/" p:suffix=".jsp"/>
        
        
         <bean id="conversionService"
          class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
          <property name="formatters">
               <list>
                    <bean class="org.fkit.formatter.DateFormatter"  c:_0="yyyy-MM-dd"/>
               </list>
          </property>
        </bean>
        
    </beans>

**五 视图**

1 registerForm.jsp

<%@ 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Formatter接口</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

<%@ 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Formatter</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>

**六 测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/e235996971174c1bae69b6ca9ca499e5.png