Spring MVC初始化参数绑定

时间:2023-03-08 16:24:48

初始化参数绑定与类型转换很类似,初始化绑定时,主要是参数类型

---单日期

在处理器类中配置绑定方法  使用@InitBinder注解

在这里首先注册一个用户编辑器 参数一为目标类型   propertyEditor为属性编辑器,此处我们选用 CustomDateEditor属性编辑器,

参数一为想转换的日期格式,参数二表示是否允许为空

package cn.controller;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.beans.propertyeditors.CustomDateEditor;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.RequestMapping; /**
*
* @author 景佩佩
*
*/
@Controller
public class MyController{
//处理器方法
@RequestMapping(value="/first.do")
public String doFirst(Date birthday,int age) {
System.out.println("3333");
return "/welcome.jsp";
} //自定义一个方法
@InitBinder
public void initBinder(WebDataBinder binder){
DateFormat df=new SimpleDateFormat("yyyy-MM-dd");
binder.registerCustomEditor(Date.class, new CustomDateEditor(df, true));
} }

只需在applicationContext.xml配置一个包扫描器就行

<?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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
"> <!-- 包扫描器 -->
<context:component-scan base-package="cn.controller"></context:component-scan> </beans>

index.jsp

<%@ 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%>">
<style type="text/css">
form{
background-color:pink;
width:500px;
}
</style>
<title></title>
</head> <body>
${ex.message }
<form action="${pageContext.request.contextPath }/first.do" method="post">
<h1>自定义类型转换器</h1>
出生日期:<input name="birthday" value="${birthday }"/>${birthdayerror }<br/><br/>
年龄:<input name="age" value="${age }"/>${ageerror }<br/><br/>
<input type="submit" value="注册"/>
</form>
</body>
</html>

welcome.jsp

<%@ 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>欢迎页面</title> </head> <body>
<h1>欢迎访问${uname }${param.uage }</h1>
</body>
</html>

Spring MVC初始化参数绑定


---多日期格式

配置步骤:

在处理器类中使用我们自定的属性编辑器

MyController.java

package cn.controller;

import java.util.Date;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.RequestMapping; @Controller
public class MyController{
//处理器方法
@RequestMapping(value="/first.do")
public String doFirst(Date birthday,int age) {
System.out.println("3333");
return "/welcome.jsp";
} //自定义一个方法
@InitBinder
public void initBinder(WebDataBinder binder){
System.out.println("==========");
binder.registerCustomEditor(Date.class, new MyDateEditor());
} }

属性编辑器

此时我们需要考虑使用哪个属性编辑器,需要定义自己的属性编辑器

大致的配置方式如单日期相似,只需要更换属性编辑即可

自定义的属性编辑器,需要我们继承PropertiesEditor,重写里面的setAsText方法,使用setValue方法赋值

MyDateEditor.java

package cn.controller;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Pattern; import org.springframework.beans.TypeMismatchException;
import org.springframework.beans.propertyeditors.PropertiesEditor;
/**
*
* @author 景佩佩
*
*/
public class MyDateEditor extends PropertiesEditor{ /**
* source:字符串型的日期
*/
@Override
public void setAsText(String source) throws IllegalArgumentException {
//一旦报错,自动调度到异常处理器
SimpleDateFormat sdf=getDateFormat(source); try {
Date date = sdf.parse(source); setValue(date);
} catch (ParseException e) {
e.printStackTrace();
}
} private SimpleDateFormat getDateFormat(String source){ SimpleDateFormat sdf=new SimpleDateFormat();
if (Pattern.matches("^\\d{4}-\\d{2}-\\d{2}$", source)) {
sdf=new SimpleDateFormat("yyyy-MM-dd");
}else if (Pattern.matches("^\\d{4}/\\d{2}/\\d{2}$", source)) {
sdf=new SimpleDateFormat("yyyy/MM/dd");
}else if (Pattern.matches("^\\d{4}\\d{2}\\d{2}$", source)) {
sdf=new SimpleDateFormat("yyyyMMdd");
}else {
throw new TypeMismatchException("",Date.class);
}
return sdf;
}
}

Spring MVC初始化参数绑定