密码验证问题

Question

我在进行密码验证方面遇到了麻烦.我从名为applicationconstants的java类中获取密码范围的最小值和最大值,并在servlet中调用它.我在另一个java类中使用验证函数并在servlet中调用它.请帮我解决这个问题.

servlet代码

int minLength = ApplicationConstants.PASSWORD_MIN_LENGTH;
int maxLength = ApplicationConstants.PASSWORD_MAX_LENGTH;

 if (user.getUserPassword().length() > 0 || user.getUserPassword() !=null) {
          if (Validation.validateStringLengthRange(user.getUserPassword(), minLength, maxLength)) {
             System.out.println("servlet");
              isvalidate = false;
              hashMap.put("password", props.getText("error.password.compare.outofrange"));
              session.setAttribute("errorMessage", hashMap);
           }
  }

Validation.java

 public static boolean validateStringLengthRange(String name, int min, int max) {
        boolean isValid = true;
        int len = name.length();
        if (len > 0) {
            if (len < min || len > max) {
                System.out.println("validation.java");
                isValid = false;
            }
        }
        return isValid;
    }

ApplicationConstants.java

public static final int PASSWORD_MIN_LENGTH = 6;
public static final int PASSWORD_MAX_LENGTH = 18;

Answer 1

盲目尝试,因为paxdiablo说你没有指明问题

如果问题是你得到NullPointerException,请仔细检查这一行

if (user.getUserPassword().length() > 0 || user.getUserPassword() !=null) {

并将其更改为

if (user.getUserPassword() !=null && user.getUserPassword().length() > 0) {

那应该解决它;)