SpringMVC04_自定義數據類型轉換器
- addDate.jsp(這裏前端會提交一個yyyy-MM-dd格式的字符串)
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/converter/date" method="post">
請輸入日期:<input type="text" name="date"/>(yyyy-MM-dd)
<br>
<input type="submit" value="提交"/>
</form>
</body>
</html>
- ConverterHandler (從前端獲取的是String類型的字符串,但需要的參數是Date類型的數據)
package com.blu.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Date;
@RestController
@RequestMapping("/converter")
public class ConverterHandler {
@RequestMapping("/date")
public String Date(Date date){
return date.toString();
}
}
- 啓動後輸入http://localhost:8080/addDate.jsp進入addDate.jsp
輸入2020-09-30後提交出現500錯誤(Failed to convert value of type ‘java.lang.String’ to required type ‘java.util.Date’):
- 添加DateConverter類並實現Converter接口:
package com.blu.converter;
import org.springframework.core.convert.converter.Converter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class DateConverter implements Converter<String,Date> {
private String pattern;
public DateConverter(String pattern){
this.pattern = pattern;
}
@Override
public Date convert(String s) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(this.pattern);
Date date = null;
try {
date = simpleDateFormat.parse(s);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}
}
- 在配置文件中配置自定義的轉換器並註冊
<!-- 配置自定義轉換器 -->
<bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
<property name="converters">
<list>
<bean class="com.blu.converter.DateConverter">
<constructor-arg type="java.lang.String" value="yyyy-MM-dd"></constructor-arg>
</bean>
</list>
</property>
</bean>
<!-- 註冊自定義轉換器的bean -->
<mvc:annotation-driven conversion-service="conversionService">
</mvc:annotation-driven>
- 重新運行,測試成功: