springboot学习记录之使用校验@Validated Date时间类型校验出现String不能转换Date

最新推荐文章于 2025-05-23 10:45:44 发布

wwzuizz

最新推荐文章于 2025-05-23 10:45:44 发布

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本文介绍如何解决Spring框架中因日期格式不匹配导致的转换异常问题，通过自定义StringToDateConverter转换器，实现对字符串到日期类型转换的灵活处理，避免了因前端传入不规范时间格式而导致的程序错误。

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当控制器的对象通过@Validated注解标注date类型的字段时候，前端在传入123等不符合时间类型的操作时候会出现

Failed to convert property value of type 'java.lang.String' to required type 'java.util.Date' for property 'createdTime1'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.util.Date] for value '1234'; nested exception is java.lang.IllegalArgumentException

这是因为spring在处理转换的时候是捕获异常直接抛出的

如图

所以做一下处理注册一个转换器

import com.sizheng.SuzhengApplication;
import org.springframework.boot.SpringApplication;
import org.springframework.core.convert.converter.Converter;
import org.springframework.lang.Nullable;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import java.beans.PropertyEditorSupport;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Pattern;

/**
 * 自定义spring校验的时间格式转换，如果转换不通过将不做报错处理
 */
public class StringToDateConverter extends PropertyEditorSupport {

    public Date convert(String value)  {
        if(StringUtils.isEmpty(value)) {
            return null;
        }
        value = value.trim();
        Date dtDate=null;
        try {
            if( Pattern.matches("^-?\\d+$", value)){
                if(value.length()>11){
                    dtDate=new Date( Long.valueOf(value));
                }else if(value.length()==11){
                    dtDate=new Date( Long.valueOf(value)*1000);
                }
            }else{
                dtDate = dateFormat.parse(value);
            }
        } catch (ParseException e) {
            e.printStackTrace();
            dtDate=null;
        }
        return dtDate;
    }
    private final DateFormat dateFormat;
    private final boolean allowEmpty;
    private final int exactDateLength;

    public StringToDateConverter(DateFormat dateFormat, boolean allowEmpty) {
        this.dateFormat = dateFormat;
        this.allowEmpty = allowEmpty;
        this.exactDateLength = -1;
    }

    public StringToDateConverter(DateFormat dateFormat, boolean allowEmpty, int exactDateLength) {
        this.dateFormat = dateFormat;
        this.allowEmpty = allowEmpty;
        this.exactDateLength = exactDateLength;
    }

    public void setAsText(@Nullable String text) throws IllegalArgumentException {
        if(this.allowEmpty && !StringUtils.hasText(text)) {
            this.setValue((Object)null);
        } else {
            if(text != null && this.exactDateLength >= 0 && text.length() != this.exactDateLength) {
                throw new IllegalArgumentException("Could not parse date: it is not exactly" + this.exactDateLength + "characters long");
            }

            this.setValue(convert(text));
        }

    }
    public static void main(String[] args) {
    }
    public String getAsText() {
        Date value = (Date)this.getValue();
        return value != null?this.dateFormat.format(value):"";
    }

}

然后后控制器注册

@InitBinder
protected void init(HttpServletRequest request, ServletRequestDataBinder binder) {
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    dateFormat.setLenient(false);
    binder.registerCustomEditor(Date.class, new StringToDateConverter(dateFormat, false));
}