Java框架如何通过异常处理实现业务逻辑？

public class MyCustomException extends RuntimeException {

    private String errorMessage;

    public MyCustomException(String errorMessage) {
        this.errorMessage = errorMessage;
    }

    public String getErrorMessage() {
        return errorMessage;
    }
}

try {
    // 可能导致异常的代码
} catch (MyCustomException e) {
    // 处理自定义异常
} catch (Exception e) {
    // 处理所有其他异常
} finally {
    // 无论是否发生异常，都会执行的代码
}

public class User {

    private String name;
    private int age;

    public User(String name, int age) {
        if (name == null || name.length() == 0) {
            throw new InvalidNameException("Name cannot be null or empty");
        }
        if (age < 0 || age > 120) {
            throw new InvalidAgeException("Age must be between 0 and 120");
        }
        this.name = name;
        this.age = age;
    }
}

public class OrderService {

    public void placeOrder(Order order) {
        try {
            // 创建订单
            // ...
            // 提交事务
            // ...
        } catch (Exception e) {
            // 回滚事务
            // ...
            throw e;
        } finally {
            // 清理资源
            // ...
        }
    }
}