使用Formatter格式化数据

深碍√TFBOYSˉ_ 2022-10-01 02:51 157阅读 0赞

代码：

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>

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：${requestScope.user.loginname }<br>
    生日：<fmt:formatDate value="${requestScope.user.birthday}" pattern="yyyy年MM月dd日"/><br>
    </body>
    </html>

User.java

package com.bean;
    
    import java.io.Serializable;
    import java.util.Date;
    
    // 域对象，实现序列化接口
    public class User implements Serializable{
    	
    	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 + "]";
    	}
    }

DateFormatter.java

package com.formatter;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.Locale;
    
    import org.springframework.format.Formatter;
    
    public class DateFormatter implements Formatter<Date> {
    	// 日期类型模板：如yyyy-MM-dd
    	private String datePattern;
    	// 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.datePattern = datePattern;
    		this.dateFormat = new SimpleDateFormat(datePattern);
    	}
    
    	// 显示Formatter<T>的T类型对象
    	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。
    	public Date parse(String source, Locale locale) throws ParseException {
    		try {
    			return dateFormat.parse(source);
    		} catch (Exception e) {
    			throw new IllegalArgumentException();
    		}
    		
    	}
    
    }

UserController.java

package com.control;
    
    
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.ModelAttribute;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    import com.bean.User;
    
    @Controller
    public class UserController{
    	private static final Log logger = LogFactory.getLog(UserController.class);
    	 
    	@RequestMapping(value="/{formName}")
    	 public String loginForm(@PathVariable String formName){
    		// 动态跳转页面
    		return formName;
    	} 
    	 @RequestMapping(value="/register",method=RequestMethod.POST)
    	 public String register(@ModelAttribute User user, Model model) {
    		 logger.info(user);
    		 model.addAttribute("user", user);
    	     return "success";
    	 }
    }

截图：

![Center][]

![Center 1][]

效果与ConversionService转换数据差不多。

[Center]: /images/20220705/dc7e3610f37c4f7f90ad682c4786e7a1.png
[Center 1]: /images/20220705/2c8e1172daa144a8a2bf44fbd5f4147d.png