• Controller層代碼

@Controller
@RequestMapping("/demo")
public class DemoController {
    @RequestMapping("/handle02")
    public ModelAndView handle02(Date birthday) {
        //服務(wù)器時間
        Date date = new Date();
        //返回服務(wù)器時間到前端頁面
        //封裝了數(shù)據(jù)和頁面信息的modelAndView
        ModelAndView modelAndView = new ModelAndView();
        //addObject 其實是向請求域中request.setAttribute("date",date)
        modelAndView.addObject("date", date);
        //視圖信息(封裝跳轉(zhuǎn)的頁面信息)
        modelAndView.setViewName("success");
        System.out.println("date: " + date);
        System.out.println("birthday" + birthday);
        return modelAndView;
    }
}

• 頁面訪問HTTP報400錯誤

  
  
  HTTP 400
• 控制臺輸出警告

[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]

從控制臺的日志上可以看出，SpringMVC沒有找到對應(yīng)的類型轉(zhuǎn)換器。

• 自定義時間類型轉(zhuǎn)換器
  實現(xiàn)Spring core包下的Converter接口，實現(xiàn)自定義轉(zhuǎn)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轉(zhuǎn)換
        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，加載自定義時間類型轉(zhuǎn)換器

        <!--
        自動注冊最合適的處理器映射器，處理器適配器(調(diào)用handler方法)
        -->
        <mvc:annotation-driven conversion-service="conversionServiceBean"/>
        <!--注冊自定義類型轉(zhuǎn)換器-->
        <bean id="conversionServiceBean" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
                <property name="converters">
                        <set>
                                <bean class="com.erxiao.edu.converter.DateConverter"></bean>
                        </set>
                </property>
        </bean>

• 驗證時間類型攔截器生效
  頁面正常能夠訪問，沒有錯誤信息

  
  
  HTTP 請求
  
  

  控制臺日志正常輸出，無異常信息

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