SpringMVC中接收到的数据都是String形式，然后再根据反射机制将String转换成对应的类型。如果此时想接收一个Date类型，那么我们可以定义一个转换器来完成。
例如，我们有下面的Emp类:
package org.lyk.vo;
import java.util.Date;
public class Emp
{
private Integer empno;
private String ename;
private Double sal;
private Date hiredate;
public Date getHiredate()
{
return hiredate;
}
public void setHiredate(Date hiredate)
{
this.hiredate = hiredate;
}
public Integer getEmpno()
{
return empno;
}
public void setEmpno(Integer empno)
{
this.empno = empno;
}
public String getEname()
{
return ename;
}
public void setEname(String ename)
{
this.ename = ename;
}
public Double getSal()
{
return sal;
}
public void setSal(Double sal)
{
this.sal = sal;
}
@Override
public String toString()
{
return "Emp [empno=" + empno + ", ename=" + ename + ", sal=" + sal + ", hiredate=" + hiredate + "]";
}
}
其中hiredate是日期类型。
下面是前端页面代码:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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>My JSP ‘insert.jsp‘ starting page</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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<form action="pages/emp/echo.action" method="post">
员工编号:<input name="empno" value="192"><br>
姓名:<input name="ename" value="刘远奎"><br>
薪水:<input name="sal" value="66.9"><br>
雇佣日期:<input name="hiredate" value="2015-10-12"/>
<input type="submit" value="提交">
</form>
</body>
</html>
下面是Spring的Action代码:
package org.lyk.servlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.lyk.vo.Dept;
import org.lyk.vo.Emp;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
@Controller
@RequestMapping("/pages/emp/*")
public class EmpServlet
{
@RequestMapping
public ModelAndView echo(Emp emp,HttpServletRequest request,HttpServletResponse response)
{
System.out.println(request.getSession().getId());
request.getServletContext();
ModelAndView mav = new ModelAndView("/pages/emp/show.jsp");
System.out.println("*********Emp:" + emp);
mav.addObject("msg", emp.toString());
return mav;
}
}
上面的代码可以在设置Emp的empno、ename、sal的时候都没有问题，但是通过后台输出发现hiredate的值为null。如果想要SpringMVC给我们做转换，则主要专门写一个String到Date的转换代码。
package org.lyk.convertor;
//org.lyk.convertor.StringToDateConvertor
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.convert.converter.Converter;
public class StringToDateConvertor implements Converter<String,Date>
{
private static final Logger logger = LoggerFactory.getLogger(StringToDateConvertor.class);
@Override
public Date convert(String dateInString)
{
logger.info("dateInString:" + dateInString);
SimpleDateFormat sdf = null;
if(dateInString != null && !"".equals(dateInString))
{
if(dateInString.matches("\\d{4}-\\d{2}-\\d{2}"))
{
sdf = new SimpleDateFormat("yyyy-MM-dd");
}else if(dateInString.matches("\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}"))
{
sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
}else if(dateInString.matches("\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}\\.\\d{3}"))
{
sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
}
else
{
logger.info("传入的日期参数格式有误!!!");
return null;
}
}
logger.info("sdf:" + sdf);
try
{
return sdf.parse(dateInString);
} catch (ParseException e)
{
e.printStackTrace();
return null;
}
}
}
然后配置上Sping的applicationContext.xml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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">
<context:annotation-config/>
<context:component-scan base-package="org.lyk"/>
<!-- 第三步: 将conversionService配置到SpringMVC中 -->
<mvc:annotation-driven conversion-service="conversionService"/>
<mvc:default-servlet-handler/>
<!-- 第一步: 给Spring容器注入String到Date的转换器 -->
<bean name="dateConvert" class="org.lyk.convertor.StringToDateConvertor"/>
<!-- 第二部: 将该转换器注入到conversionService里 -->
<bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
<property name="converters">
<set>
<ref bean="dateConvert"/>
</set>
</property>
</bean>
</beans>
运行程序，后台输出结果.
时间： 2024-08-02 12:40:32