Converter
函數式接口
能夠將任意類型轉換爲指定的任意類型：
S是源類型，T是目標類型。
比如字符串->日期
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.core.convert.converter.Converter;
public class DateConverter implements Converter<String, Date>{
private String pattern = "yyyy-MM-dd HH:mm:ss,s";
@Override
public Date convert(String arg0) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
try{
return simpleDateFormat.parse(arg0);
} catch(ParseException parseException) {
throw new IllegalArgumentException("this pattern"+pattern);
}
}
}
配置文件添加配置
<!-- 顯示的裝配自定義類型轉換器 -->
<mvc:annotation-driven conversion-service="conversionService">
</mvc:annotation-driven>
<!-- 自定義類型轉換器配置 -->
<bean id="conversionService"
class="org.springframework.context.support.ConversionServiceFactoryBean">
<property name="converters">
<set>
<bean class="my_convert.DateConverter"></bean>
</set>
</property>
</bean>
頁面
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!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">
<title>converter Date</title>
</head>
<body>
<form action="test/getDate" method="get">
<input type="text" name="date"><br/>
<input type="submit" value="提交">
</form>
</body>
</html>
controller
@RequestMapping("/toDate")
public String toDate(){
return "date";
}
@RequestMapping("/getDate")
public String converterDate(Date date,Model model){
model.addAttribute("message", date);
return "first";
}