springmvc时间date转换器（处理多种时间格式）

首先定义一个时间转换器的类DateAdvice，在springmvc中DateFormat不能是数组，所以就重写CustomDateEditor类并且命名为

MyCustomDateEditor类

@ControllerAdvice
public class DateAdvice {

    @InitBinder
    public void init(WebDataBinder binder){
        DateFormat[] dateFormat={
                new SimpleDateFormat("yyyy-MM-dd"),
                new SimpleDateFormat("yyyy/MM/dd"),
                new SimpleDateFormat("yyyy.MM.dd"),
                new SimpleDateFormat("yyyy年MM月dd日")
        };
        MyCustomDateEditor customDateEditor = new MyCustomDateEditor(dateFormat,true);
        binder.registerCustomEditor(Date.class,customDateEditor);
    }
}

接下来就对MyCustomDateEditor进行修改

public class MyCustomDateEditor extends PropertyEditorSupport {

    private final DateFormat[] dateFormat;

    private final boolean allowEmpty;

    private final int exactDateLength;


    /**
     * Create a new CustomDateEditor instance, using the given DateFormat
     * for parsing and rendering.
     * <p>The "allowEmpty" parameter states if an empty String should
     * be allowed for parsing, i.e. get interpreted as null value.
     * Otherwise, an IllegalArgumentException gets thrown in that case.
     * @param dateFormat the DateFormat to use for parsing and rendering
     * @param allowEmpty if empty strings should be allowed
     */
    public MyCustomDateEditor(DateFormat[] dateFormat, boolean allowEmpty) {
        this.dateFormat = dateFormat;
        this.allowEmpty = allowEmpty;
        this.exactDateLength = -1;
    }

    /**
     * Create a new CustomDateEditor instance, using the given DateFormat
     * for parsing and rendering.
     * <p>The "allowEmpty" parameter states if an empty String should
     * be allowed for parsing, i.e. get interpreted as null value.
     * Otherwise, an IllegalArgumentException gets thrown in that case.
     * <p>The "exactDateLength" parameter states that IllegalArgumentException gets
     * thrown if the String does not exactly match the length specified. This is useful
     * because SimpleDateFormat does not enforce strict parsing of the year part,
     * not even with {@code setLenient(false)}. Without an "exactDateLength"
     * specified, the "01/01/05" would get parsed to "01/01/0005". However, even
     * with an "exactDateLength" specified, prepended zeros in the day or month
     * part may still allow for a shorter year part, so consider this as just
     * one more assertion that gets you closer to the intended date format.
     * @param dateFormat the DateFormat to use for parsing and rendering
     * @param allowEmpty if empty strings should be allowed
     * @param exactDateLength the exact expected length of the date String
     */
    public MyCustomDateEditor(DateFormat[] dateFormat, boolean allowEmpty, int exactDateLength) {
        this.dateFormat = dateFormat;
        this.allowEmpty = allowEmpty;
        this.exactDateLength = exactDateLength;
    }


    /**
     * Parse the Date from the given text, using the specified DateFormat.
     */
    @Override
    public void setAsText(@Nullable String text) throws IllegalArgumentException {
        if (this.allowEmpty && !StringUtils.hasText(text)) {
            // Treat empty String as null value.
            setValue(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");
        }
        else {
            boolean flag = false;
            for (DateFormat df : dateFormat) {
                try {
                    setValue(df.parse(text));
                    flag = true;
                    break;
                } catch (ParseException ex) {
                    continue;
                }
            }
            if (flag == false) {
                throw new IllegalArgumentException("Could not parse date: ");
            }
        }
    }

    /**
     * Format the Date as String, using the specified DateFormat.
     */
    @Override
    public String getAsText() {
        Date value = (Date) getValue();
        for (DateFormat df : dateFormat) {
            try {
                return df.format(value);
            } catch (Exception e) {
                continue;
            }
        }
        return "";
    }

}

注意：主要是为了把DateFormat转为数组，这样就进行了多种日期转换

标签：String,DateFormat,springmvc,exactDateLength,dateFormat,new,date,转换器,allowEmpty
来源： https://www.cnblogs.com/lovertc/p/15481981.html