自定义校验策略：巧用策略模式优化表单校验表

前端

2024-01-08 04:45:20

策略模式：应对算法变更的灵活之选

什么是策略模式？

策略模式是一种行为设计模式，它将算法的实现与算法的使用分离开来。这就像将算法封装在一个个单独的模块中，使我们能够灵活地切换这些模块，而不影响代码的其余部分。

策略模式的优点

策略模式备受青睐，因为它提供了以下优势：

算法独立性： 策略模式允许算法独立于客户端代码进行更改。这意味着我们可以在不影响现有代码的情况下，轻松地添加、修改或删除算法。
扩展性： 添加新算法变得轻而易举，因为我们只需创建一个新的策略类，而不需要修改现有代码。
可维护性： 将算法隔离到单独的类中，提高了代码的可读性和可维护性，使我们能够更轻松地理解和管理算法。

表单校验中的策略模式

表单校验策略是用于验证表单数据的算法。策略模式非常适用于表单校验，因为表单校验规则经常需要根据不同的需求进行调整。

表单校验代码实现

让我们用一个示例来演示策略模式如何应用于表单校验：

// FormValidator.java
public class FormValidator {

    private List<ValidationStrategy> validationStrategies;

    public FormValidator() {
        this.validationStrategies = new ArrayList<>();
    }

    public void addValidationStrategy(ValidationStrategy validationStrategy) {
        this.validationStrategies.add(validationStrategy);
    }

    public boolean validate(FormData formData) {
        for (ValidationStrategy validationStrategy : validationStrategies) {
            if (!validationStrategy.validate(formData)) {
                return false;
            }
        }
        return true;
    }
}

// ValidationStrategy.java
public interface ValidationStrategy {

    boolean validate(FormData formData);
}

// UsernameValidationStrategy.java
public class UsernameValidationStrategy implements ValidationStrategy {

    @Override
    public boolean validate(FormData formData) {
        return !formData.getUsername().isEmpty();
    }
}

// PasswordValidationStrategy.java
public class PasswordValidationStrategy implements ValidationStrategy {

    @Override
    public boolean validate(FormData formData) {
        return formData.getPassword().length() >= 6;
    }
}

// PhoneNumberValidationStrategy.java
public class PhoneNumberValidationStrategy implements ValidationStrategy {

    @Override
    public boolean validate(FormData formData) {
        return formData.getPhoneNumber().matches("^(13[0-9]|14[5|7]|15[0|1|2|3|5|6|7|8|9]|18[0|1|2|3|5|6|7|8|9])\\d{8}// FormValidator.java
public class FormValidator {

    private List<ValidationStrategy> validationStrategies;

    public FormValidator() {
        this.validationStrategies = new ArrayList<>();
    }

    public void addValidationStrategy(ValidationStrategy validationStrategy) {
        this.validationStrategies.add(validationStrategy);
    }

    public boolean validate(FormData formData) {
        for (ValidationStrategy validationStrategy : validationStrategies) {
            if (!validationStrategy.validate(formData)) {
                return false;
            }
        }
        return true;
    }
}

// ValidationStrategy.java
public interface ValidationStrategy {

    boolean validate(FormData formData);
}

// UsernameValidationStrategy.java
public class UsernameValidationStrategy implements ValidationStrategy {

    @Override
    public boolean validate(FormData formData) {
        return !formData.getUsername().isEmpty();
    }
}

// PasswordValidationStrategy.java
public class PasswordValidationStrategy implements ValidationStrategy {

    @Override
    public boolean validate(FormData formData) {
        return formData.getPassword().length() >= 6;
    }
}

// PhoneNumberValidationStrategy.java
public class PhoneNumberValidationStrategy implements ValidationStrategy {

    @Override
    public boolean validate(FormData formData) {
        return formData.getPhoneNumber().matches("^(13[0-9]|14[5|7]|15[0|1|2|3|5|6|7|8|9]|18[0|1|2|3|5|6|7|8|9])\\d{8}$");
    }
}

// FormData.java
public class FormData {

    private String username;
    private String password;
    private String phoneNumber;

    public FormData(String username, String password, String phoneNumber) {
        this.username = username;
        this.password = password;
        this.phoneNumber = phoneNumber;
    }

    // getters and setters
}
quot;);
    }
}

// FormData.java
public class FormData {

    private String username;
    private String password;
    private String phoneNumber;

    public FormData(String username, String password, String phoneNumber) {
        this.username = username;
        this.password = password;
        this.phoneNumber = phoneNumber;
    }

    // getters and setters
}