spring mvc时间格式化（注解驱动格式化）

拼搏现实的明天。 2022-08-12 01:17 221阅读 0赞

今天在测试spring mvc时间类型数据转换，出现一个问题，现在和大家分享一下：

1.模型文件 User.java代码如下：

package cn.itcast.model;
    
    import java.util.Date;
    
    import javax.validation.constraints.Max;
    import javax.validation.constraints.Min;
    import javax.validation.constraints.NotNull;
    import javax.validation.constraints.Past;
    import javax.validation.constraints.Size;
    
    import org.springframework.format.annotation.DateTimeFormat;
    
    /**
     *
     */
    public class User {
    	private Integer id;
    	private String name;
    	private Integer age;
    	private String email;
    	private String addr;
    	@DateTimeFormat(pattern="yyyy-MM-dd")
    	private Date birthday;	//Date默认转化的时间格式为：1990/12/19
    	public Integer getId() {
    		return id;
    	}
    	public void setId(Integer id) {
    		this.id = id;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public Date getBirthday() {
    		return birthday;
    	}
    	public void setBirthday(Date birthday) {
    		this.birthday = birthday;
    	}
    	public Integer getAge() {
    		return age;
    	}
    	public void setAge(Integer age) {
    		this.age = age;
    	}
    	public String getEmail() {
    		return email;
    	}
    	public void setEmail(String email) {
    		this.email = email;
    	}
    	public String getAddr() {
    		return addr;
    	}
    	public void setAddr(String addr) {
    		this.addr = addr;
    	}
    	@Override
    	public String toString() {
    		return "User [addr=" + addr + ", age=" + age + ", birthday=" + birthday
    				+ ", email=" + email + ", id=" + id + ", name=" + name + "]";
    	}
    }

2.前台表单页面：add.jsp

<pre name="code" class="html"><%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <base href="<%=basePath%>">
        
        <title>添加用户</title>
        
    	<meta http-equiv="pragma" content="no-cache">
    	<meta http-equiv="cache-control" content="no-cache">
    	<meta http-equiv="expires" content="0">    
    	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    	<meta http-equiv="description" content="This is my page">
    	
    	<style type="text/css">
    		html,body{
    			margin:0;
    			padding:0;
    			font-size: 12px;
    			font-family: "仿宋";
    		}
    		
    		input{
    			width:180px;
    			height:25px;
    		}
    		
    		.error {  
    			color: #ff0000;  
    			font-style: italic;  
    		}
    	</style>
      </head>
      
      <body>
        <div style="width: 400px;margin: 100px auto;">
        	<fieldset style="width: 100%">
        		<legend>添加学生</legend>
        		<form action="${pageContext.request.contextPath}/user/save"  method="POST">
    	    		<table border="0" cellpadding="5" cellspacing="0" style="margin: 0 auto;">
    	    			<tr>
    	    				<td>ID:</td>
    	    				<td>
    	    					<input type="text" name="id"/>
    	    				</td>
    	    			</tr>
    	    			<tr>
    	    				<td>姓名:</td>
    	    				<td>
    	    					<input type="text" name="name"/>
    	    				</td>
    	    			</tr>
    	    			<tr>
    	    				<td>邮箱:</td>
    	    				<td>
    	    					<input type="text" name="email"/>
    	    				</td>
    	    			</tr>
    	    			<tr>
    	    				<td>年龄:</td>
    	    				<td>
    	    					<input type="text" name="age"/>
    	    				</td>
    	    			</tr>
    	    			<tr>
    	    				<td>生日:</td>
    	    				<td>
    	    					<input type="text" name="birthday"/>
    	    				</td>
    	    			</tr>
    	    			<tr>
    	    				<td colspan="2" align="center">
    	    					<input type="submit" value="添加" style="width:60px;"/>
    	    				</td>
    	    			</tr>
    	    		</table>
        		</form>
        	</fieldset>
        </div>
      </body>
    </html>

</pre>3.UserController.java代码如下

<pre name="code" class="java">package cn.itcast.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.ModelAttribute;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    import cn.itcast.model.User;
    
    @Controller
    @RequestMapping("/user")
    public class UserController {
    	@RequestMapping("/add")
    	public String add(){
    		return "user/add";
    	}
    	@RequestMapping(value="/save",method=RequestMethod.POST)
    	public String save(@ModelAttribute("user") User user){
    		return "user/success";
    	}
    }

问题：

<span style="white-space:pre">	</span>在表单提交时后台服务端报错500，原因为String类型的birthday无法装换为Date类型，那就相当于我再model中添加的@DateTimeFormat注解没有起作用。

解决办法：

<span style="white-space:pre">	</span>添加joda-time.jar到项目中（我的理解：spring Formator只是提供接口，并没有具体的实现，而joda-time相当于实现了该接口）。