- Controller层代码
@Controller
@RequestMapping("/demo")
public class DemoController {
@RequestMapping("/handle02")
public ModelAndView handle02(Date birthday) {
//服务器时间
Date date = new Date();
//返回服务器时间到前端页面
//封装了数据和页面信息的modelAndView
ModelAndView modelAndView = new ModelAndView();
//addObject 其实是向请求域中request.setAttribute("date",date)
modelAndView.addObject("date", date);
//视图信息(封装跳转的页面信息)
modelAndView.setViewName("success");
System.out.println("date: " + date);
System.out.println("birthday" + birthday);
return modelAndView;
}
}
-
页面访问HTTP报400错误
HTTP 400 - 控制台输出警告
[INFO] Initializing Servlet 'springmvc'
[INFO] Completed initialization in 677 ms
[WARNING] Resolved [org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.util.Date'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.util.Date] for value '2021-08-16'; nested exception is java.lang.IllegalArgumentException]
从控制台的日志上可以看出,SpringMVC没有找到对应的类型转换器。
- 自定义时间类型转换器
实现Spring core包下的Converter接口,实现自定义转化器
import org.springframework.core.convert.converter.Converter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* @Version 1.0
*/
public class DateConverter implements Converter<String, Date> {
@Override
public Date convert(String source) {
// 完成字符串向日期的转换
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
try {
Date parse = simpleDateFormat.parse(source);
return parse;
} catch (ParseException e) {
e.printStackTrace();
}
return null;
}
}
修改Spring MVC配置文件,加载自定义时间类型转换器
<!--
自动注册最合适的处理器映射器,处理器适配器(调用handler方法)
-->
<mvc:annotation-driven conversion-service="conversionServiceBean"/>
<!--注册自定义类型转换器-->
<bean id="conversionServiceBean" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
<property name="converters">
<set>
<bean class="com.erxiao.edu.converter.DateConverter"></bean>
</set>
</property>
</bean>
-
验证时间类型拦截器生效
页面正常能够访问,没有错误信息
HTTP 请求
控制台日志正常输出,无异常信息
INFO] Initializing Servlet 'springmvc'
[INFO] Completed initialization in 648 ms
date: Mon Aug 16 17:49:01 CST 2021
birthdayMon Aug 16 00:00:00 CST 2021