SpringMVC日期时间格式化方式

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### 引入平时，在写前端页面时，很有可能会涉及到表单中有日期的情况，一般情况下不同的业务使用的日期格式都有所不同。下面看下一个简单的例子说明SpringMVC对日期的处理。jsp页面如下（简单的表单，其中有一个输入框中输入的是日期时间）：

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><!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"></head><body><form id="addForm" action="<c:url value='/doAdd'/>" method="POST" >    <input type="text" name="name" value="测试"/>     <input type="text" name="birthtime" value="2017-10-10 10:10"/>    <button type="submit">保存</button></form></body></html>``POJO如下：```javapublic class User{    private String name;    private Date birthtime;        // 属性的setter/getter方法略}<div class="se-preview-section-delimiter"></div>

Controller如下：

@Controllerpublic class TestFileController {    @RequestMapping("/doAdd")    public void doAdd(@ModelAttribute User user, HttpServletRequest request){        System.out.println(user.getName());        System.out.println(user.getBirthtime());    }}<div class="se-preview-section-delimiter"></div>

此时，SpringMVC会爆出异常：

org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errorsField error in object ‘user’ on field ‘birthtime’: rejected value [2017-10-10 10:10]; codes [typeMismatch.user.birthtime,typeMismatch.birthtime,typeMismatch.java.util.Date,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [user.birthtime,birthtime]; arguments []; default message [birthtime]]; default message [Failed to convert property value of type ‘java.lang.String’ to required type ‘java.util.Date’ for property ‘birthtime’; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type java.lang.String to type java.util.Date for value ‘2017-10-10 10:10’; nested exception is java.lang.IllegalArgumentException] at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:113) at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:78) at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:162) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:129) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:111) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:806) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:729) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

此异常是什么意思呢？很明显，输入的字符串’2017-10-10 10:10’不能转换为Date类型。所以下面要做的就是把前端的字符串形式的日期转换为java.util.Date类型。

SpringMVC日期处理

处理前端到控制器的日期有两种方式：(当前不止两种了！)
1. 在控制器中使用@InitBind注解
2. 在POJO中日期属性上添加@DateTimeFormat

方式1：在控制器中使用@InitBind注解

@Controllerpublic class TestFileController {    @InitBinder    public void initBind(WebDataBinder binder){        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");          dateFormat.setLenient(false);          binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));       }    @RequestMapping("/doAdd")    public void doAdd(@ModelAttribute User user, HttpServletRequest request){        System.out.println(user.getName());        System.out.println(user.getBirthtime());    }}<div class="se-preview-section-delimiter"></div>

方式2：在POJO中日期属性上添加@DateTimeFormat

public class User{    private String name;    @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm")    private Date birthtime;    // 属性的setter/getter方法略}

参考

SpringMVC日期类型转换问题三大处理方法归纳

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