解决springboot 实体类String转Date类型的坑

来源：jb51　　时间：2021/10/25 11:25:37　　对本文有异议

springboot 实体类String转Date类型

前端传入一个String的时间字符串如：2019-07-18 23:59:59

后端实体类要在头顶加注解：

@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")

不然会出现报错

Date解析String类型的参数

1.首先建立String to Date 的解析实现

import org.apache.commons.lang3.StringUtils;
import org.springframework.core.convert.converter.Converter;
import java.text.SimpleDateFormat;
import java.util.Date;
public class StringToDateConverter implements Converter<String, Date> {
    private static final String dateFormat = "yyyy-MM-dd HH:mm:ss";
    private static final String shortDateFormat = "yyyy-MM-dd";
    @Override
    public Date convert(String value) {
        if (StringUtils.isEmpty(value)) {
            return null;
        }
        value = value.trim();
        try {
            if (value.contains("-")) {
                SimpleDateFormat formatter;
                if (value.contains(":")) {
                    formatter = new SimpleDateFormat(dateFormat);
                } else {
                    formatter = new SimpleDateFormat(shortDateFormat);
                }
                Date dtDate = formatter.parse(value);
                return dtDate;
            } else if (value.matches("^\\d+$")) {
                Long lDate = new Long(value);
                return new Date(lDate);
            }
        } catch (Exception e) {
            throw new RuntimeException(String.format("parser %s to Date failed", value));
        }
        throw new RuntimeException(String.format("parser %s to Date failed", value));
    }
}

2.创建全局的解析配置

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.convert.support.GenericConversionService;
import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;
import javax.annotation.PostConstruct;
@Configuration
public class DateHandlerAdapter {
    @Autowired
    private RequestMappingHandlerAdapter handlerAdapter;
    /**
     * 增加字符串转日期的全局适配器
     */
    @PostConstruct
    public void initEditableAvlidation() {
        ConfigurableWebBindingInitializer initializer = (ConfigurableWebBindingInitializer) handlerAdapter
                .getWebBindingInitializer();
        if (initializer.getConversionService() != null) {
            GenericConversionService genericConversionService = (GenericConversionService) initializer
                    .getConversionService();
            genericConversionService.addConverter(new StringToDateConverter());
        }
    }
}