SpringMVC日期类型接收空值异常问题解决方法

@InitBinder
  protected void initDateFormatBinder(WebDataBinder binder) {
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
  }

public class CustomDateEditor extends PropertyEditorSupport {
  private final DateFormat dateFormat;
  private final boolean allowEmpty;
  private final int exactDateLength;

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

public class mytest {
  public static void main(String[] args) {
    DispatchInfoModel tm = new DispatchInfoModel();
    BeanWrapper bw = new BeanWrapperImpl(tm);
    bw.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), true));
    bw.setPropertyValue("signDate", "");
    System.out.println(tm.getSignDate());
  }
}

public class mytest {
  public static void main(String[] args) {
    DispatchInfoModel tm = new DispatchInfoModel();
    BeanWrapper bw = new BeanWrapperImpl(tm);
    bw.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), false));
    bw.setPropertyValue("signDate", "");
    System.out.println(tm.getSignDate());
  }
}