2.4.2.2. 检查类文件

所有 编号快速启动 源文件都可在 QUICKSTART_HOME/numberguess/src/main/java/org/jboss/as/quickstarts/numberguess/ 目录中找到。软件包声明和导入已从这些列表中排除。Quickstart 源代码中提供了完整的列表。

查看 Random.java Qualifier Code
限定符用于消除两个 Bean 之间的不确定性，两者都有资格根据其类型注入。如需有关限定符的更多信息，请参阅《JBoss EAP 开发指南 》中的使用限定符解决 Ambiguous Injection。@Random 限定符用于注入随机数字。
```
@Target({ TYPE, METHOD, PARAMETER, FIELD })
@Retention(RUNTIME)
@Documented
@Qualifier
public @interface Random {

}
```
```
@Target({ TYPE, METHOD, PARAMETER, FIELD })
@Retention(RUNTIME)
@Documented
@Qualifier
public @interface Random {

}
```
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查看 MaxNumber.java Qualifier Code

@MaxNumber 限定符 用于注入允许的最大数量。

@Target({ TYPE, METHOD, PARAMETER, FIELD })
@Retention(RUNTIME)
@Documented
@Qualifier
public @interface MaxNumber {
}

@Target({ TYPE, METHOD, PARAMETER, FIELD })
@Retention(RUNTIME)
@Documented
@Qualifier
public @interface MaxNumber {
}

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查看 Generator.java Code

Generator 类通过制作者方法创建随机数，并通过相同方式公开可能的最大数量。此类为应用范围，因此每次都不会出现不同的随机值。

@SuppressWarnings("serial")
@ApplicationScoped
public class Generator implements Serializable {

    private java.util.Random random = new java.util.Random(System.currentTimeMillis());

    private int maxNumber = 100;

    java.util.Random getRandom() {
        return random;
    }

    @Produces
    @Random
    int next() {
        // a number between 1 and 100
        return getRandom().nextInt(maxNumber - 1) + 1;
    }

    @Produces
    @MaxNumber
    int getMaxNumber() {
        return maxNumber;
    }
}

@SuppressWarnings("serial")
@ApplicationScoped
public class Generator implements Serializable {

    private java.util.Random random = new java.util.Random(System.currentTimeMillis());

    private int maxNumber = 100;

    java.util.Random getRandom() {
        return random;
    }

    @Produces
    @Random
    int next() {
        // a number between 1 and 100
        return getRandom().nextInt(maxNumber - 1) + 1;
    }

    @Produces
    @MaxNumber
    int getMaxNumber() {
        return maxNumber;
    }
}

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查看 Game.java Code

会话范围的 Game 类是应用的主要入口点。它负责设置或重置游戏，捕获和验证用户的猜测，并通过 FacesMessage 向用户提供反馈。它使用构建后生命周期方法从 @Random Instance<Integer> bean 检索随机数来初始化游戏。

注意类中的 @Named 注释。只有在您想要使用 Jakarta Expression Language（本例中为 #{game} ）使 bean 可访问 JSF 视图时，才需要此注解。

@SuppressWarnings("serial")
@Named
@SessionScoped
public class Game implements Serializable {

    /**
     * The number that the user needs to guess
     */
    private int number;

    /**
     * The users latest guess
     */
    private int guess;

    /**
     * The smallest number guessed so far (so we can track the valid guess range).
     */
    private int smallest;

    /**
     * The largest number guessed so far
     */
    private int biggest;

    /**
     * The number of guesses remaining
     */
    private int remainingGuesses;

    /**
     * The maximum number we should ask them to guess
     */
    @Inject
    @MaxNumber
    private int maxNumber;

    /**
     * The random number to guess
     */
    @Inject
    @Random
    Instance<Integer> randomNumber;

    public Game() {
    }

    public int getNumber() {
        return number;
    }

    public int getGuess() {
        return guess;
    }

    public void setGuess(int guess) {
        this.guess = guess;
    }

    public int getSmallest() {
        return smallest;
    }

    public int getBiggest() {
        return biggest;
    }

    public int getRemainingGuesses() {
        return remainingGuesses;
    }

    /**
     * Check whether the current guess is correct, and update the biggest/smallest guesses as needed. Give feedback to the user
     * if they are correct.
     */
    public void check() {
        if (guess > number) {
            biggest = guess - 1;
        } else if (guess < number) {
            smallest = guess + 1;
        } else if (guess == number) {
            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Correct!"));
        }
        remainingGuesses--;
    }

    /**
     * Reset the game, by putting all values back to their defaults, and getting a new random number. We also call this method
     * when the user starts playing for the first time using {@linkplain PostConstruct @PostConstruct} to set the initial
     * values.
     */
    @PostConstruct
    public void reset() {
        this.smallest = 0;
        this.guess = 0;
        this.remainingGuesses = 10;
        this.biggest = maxNumber;
        this.number = randomNumber.get();
    }

    /**
     * A JSF validation method which checks whether the guess is valid. It might not be valid because there are no guesses left,
     * or because the guess is not in range.
     *
     */
    public void validateNumberRange(FacesContext context, UIComponent toValidate, Object value) {
        if (remainingGuesses <= 0) {
            FacesMessage message = new FacesMessage("No guesses left!");
            context.addMessage(toValidate.getClientId(context), message);
            ((UIInput) toValidate).setValid(false);
            return;
        }
        int input = (Integer) value;

        if (input < smallest || input > biggest) {
            ((UIInput) toValidate).setValid(false);

            FacesMessage message = new FacesMessage("Invalid guess");
            context.addMessage(toValidate.getClientId(context), message);
        }
    }
}

@SuppressWarnings("serial")
@Named
@SessionScoped
public class Game implements Serializable {

    /**
     * The number that the user needs to guess
     */
    private int number;

    /**
     * The users latest guess
     */
    private int guess;

    /**
     * The smallest number guessed so far (so we can track the valid guess range).
     */
    private int smallest;

    /**
     * The largest number guessed so far
     */
    private int biggest;

    /**
     * The number of guesses remaining
     */
    private int remainingGuesses;

    /**
     * The maximum number we should ask them to guess
     */
    @Inject
    @MaxNumber
    private int maxNumber;

    /**
     * The random number to guess
     */
    @Inject
    @Random
    Instance<Integer> randomNumber;

    public Game() {
    }

    public int getNumber() {
        return number;
    }

    public int getGuess() {
        return guess;
    }

    public void setGuess(int guess) {
        this.guess = guess;
    }

    public int getSmallest() {
        return smallest;
    }

    public int getBiggest() {
        return biggest;
    }

    public int getRemainingGuesses() {
        return remainingGuesses;
    }

    /**
     * Check whether the current guess is correct, and update the biggest/smallest guesses as needed. Give feedback to the user
     * if they are correct.
     */
    public void check() {
        if (guess > number) {
            biggest = guess - 1;
        } else if (guess < number) {
            smallest = guess + 1;
        } else if (guess == number) {
            FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Correct!"));
        }
        remainingGuesses--;
    }

    /**
     * Reset the game, by putting all values back to their defaults, and getting a new random number. We also call this method
     * when the user starts playing for the first time using {@linkplain PostConstruct @PostConstruct} to set the initial
     * values.
     */
    @PostConstruct
    public void reset() {
        this.smallest = 0;
        this.guess = 0;
        this.remainingGuesses = 10;
        this.biggest = maxNumber;
        this.number = randomNumber.get();
    }

    /**
     * A JSF validation method which checks whether the guess is valid. It might not be valid because there are no guesses left,
     * or because the guess is not in range.
     *
     */
    public void validateNumberRange(FacesContext context, UIComponent toValidate, Object value) {
        if (remainingGuesses <= 0) {
            FacesMessage message = new FacesMessage("No guesses left!");
            context.addMessage(toValidate.getClientId(context), message);
            ((UIInput) toValidate).setValid(false);
            return;
        }
        int input = (Integer) value;

        if (input < smallest || input > biggest) {
            ((UIInput) toValidate).setValid(false);

            FacesMessage message = new FacesMessage("Invalid guess");
            context.addMessage(toValidate.getClientId(context), message);
        }
    }
}

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2.4.2.2. 检查类文件

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