Methods to solve Java data validity exception (DataValidityException)

Methods to solve Java data validity exception (DataValidityException)

In the Java development process, we often encounter data validity checking and processing. When the data does not meet the expected specifications or conditions, a DataValidityException is usually thrown. This article will introduce how to solve this exception and give corresponding code examples.

1. Introduction to exceptions

DataValidityException is a runtime exception, which indicates that the validity check of the data failed. Typically, we want to check some constraints on the input data to ensure that it meets expectations. If the data does not meet these conditions, a DataValidityException can be thrown.

2. Common Scenarios

In actual development, the common scenarios of DataValidityException are as follows:

1. The user input data does not meet the requirements: such as requiring input 's age must be greater than or equal to 18 years old, but the user entered a negative number.
2. Validity check when inserting or updating data in the database: For example, it is required that the phone number inserted must be 11 digits, but a string with a length of not 11 is inserted.

3. Solution

To solve the DataValidityException exception, we can take the following methods:

1. Input data verification

For the data entered by the user, we can check the validity in the front-end page or back-end logic. If the data does not meet the conditions, you can manually throw a DataValidityException in the code. The following is a simple code example:

public class User {
    private String name;
    private int age;

    public User(String name, int age) throws DataValidityException {
        if (age < 0) {
            throw new DataValidityException("Age must be a positive number.");
        }
        this.name = name;
        this.age = age;
    }

    // getter and setter methods
}

2. Database operation verification

Before inserting or updating data, we can first verify the validity of the data that needs to be operated. verify. If the data does not meet the requirements, you can directly throw DataValidityException. The following is a code example for a simple database insertion operation:

public void insertUser(User user) throws DataValidityException {
    if (user.getName() == null || user.getName().isEmpty()) {
        throw new DataValidityException("User name is required.");
    }
    if (user.getAge() < 18) {
        throw new DataValidityException("User age must be at least 18.");
    }
    // 数据库插入操作
}

4. Exception handling

When the DataValidityException exception is thrown, we can handle the exception through the try-catch statement. You can choose to perform corresponding processing after catching the exception, such as outputting error information, exception logging, or returning prompt information to the front end. The following is a code example of exception handling:

public void processUser(User user) {
    try {
        // 调用数据库插入操作
        insertUser(user);
    } catch (DataValidityException e) {
        // 输出错误信息或给前端返回提示
        System.out.println("Invalid data: " + e.getMessage());
    }
}

Summary:

DataValidityException exception is a common data validity check exception in Java. By verifying the input data, invalid data can be avoided . For this kind of exception, we can handle and prompt accordingly through the exception handling mechanism. Paying attention to data validity checking in the code can improve the reliability and stability of the system.

Note: The above example code is for reference only. In actual development, it may need to be adjusted and expanded according to specific business needs.

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