Spring MVC 使用Conversionservice转换数据

不念不忘少年蓝@ 2022-05-15 01:18 267阅读 0赞

**示例【Spring MVC 使用Conversionservice转换数据】**

**创建项目并导入相关jar包**

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**创建register.jsp**

<%@ page language="java" contentType="text/html; charset=utf-8"
        pageEncoding="utf-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="utf-8">
    <title>自定义类型转换器</title>
    </head>
    <body>
    	<form action="register" method="post">
    		<table>
    			<tr>
    				<td>用户名：</td>
    				<td><input type="text" name="userName"></td>
    			</tr>
    			<tr>
    				<td>密码：</td>
    				<td><input type="password" name="passWord"></td>
    			</tr>
    			<tr>
    				<td>生日：</td>
    				<td><input type="text" name="birthday"></td>
    			</tr>
    			<tr>
    				<td></td>
    				<td><input type="submit" value="注册"></td>
    			</tr>
    		</table>
    	</form>
    </body>
    </html>

**创建User**

package com.po;
    import java.util.Date;
    public class User {
    	private String userName;			//用户名
    	private String passWord;			//密码
    	private Date birthday;				//生日
    	public String getUserName() {
    		return userName;
    	}
    	public void setUserName(String userName) {
    		this.userName = userName;
    	}
    	public String getPassWord() {
    		return passWord;
    	}
    	public void setPassWord(String passWord) {
    		this.passWord = passWord;
    	}
    	public Date getBirthday() {
    		return birthday;
    	}
    	public void setBirthday(Date birthday) {
    		this.birthday = birthday;
    	}
    	@Override
    	public String toString() {
    		return "User [userName=" + userName + ", passWord=" + passWord + ", birthday=" + birthday + "]";
    	}
    }

**创建UserController**

package com.controller;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.ModelAttribute;
    import org.springframework.web.bind.annotation.RequestMapping;
    import com.po.User;
    @Controller
    public class UserController {
    	@RequestMapping("/register")
    	public String register(@ModelAttribute User user,Model model) {
    		System.out.println(user);
    		model.addAttribute("user", user);
    		return "success";
    	}
    }

**创建MyConverter**

package com.converter;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    
    import org.springframework.core.convert.converter.Converter;
    
    public class MyConverter implements Converter<String, Date>{
    	private String datePattern;
    	public void setDatePattern(String datePattern) {
    		this.datePattern = datePattern;
    	}
    	@Override
    	public Date convert(String date) {
    		SimpleDateFormat dateFormat = new SimpleDateFormat(this.datePattern);
    		try {
    			return dateFormat.parse(date);
    		} catch (ParseException e) {
    			e.printStackTrace();
    		}
    		return null;
    	}	
    }

**在springmvc-config.xml中加入自定义转换器**

<?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:p="http://www.springframework.org/schema/p"
        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-4.1.xsd
            http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
    
    <mvc:annotation-driven conversion-service="conversionService"/>
    
    <context:component-scan base-package="com.*" />
    
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    	<property name="prefix" value=""></property>
    	<property name="suffix" value=".jsp" />
    </bean>
    
         <bean id="conversionService" 
        	class="org.springframework.context.support.ConversionServiceFactoryBean">
        	<property name="converters">
        		<list>
        			<bean class="com.converter.MyConverter"
        			p:datePattern="yyyy-MM-dd"></bean>
        		</list>
        	</property>
        </bean>
    </beans>

**创建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>
    <html>
    <head>
    <meta charset="utf-8">
    <title>success</title>
    </head>
    <body>
    	用户名：${requestScope.user.userName }<br>
    	生日：<fmt:formatDate value="${requestScope.user.birthday}" pattern="yyyy年MM月dd日"/><br>
    </body>
    </html>

**启动Tomcat访问register.jsp**

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