使用Java顯示隨機圖片

Question

我試圖顯示基於Random（）方法的生成的隨機圖片（只是嘗試像驗證碼）。 我正在從數組中生成隨機否，但不知道如何用圖像映射這些否。 有任何想法嗎 ？ 到目前為止，我所做的是：

導入java.util.Arrays; 導入java.util.Random;

公共課程Gen_Captcha {

static String[] myCaptchaLetters = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","0","1","2","3","4","5","6","7","8","9"};
Gen_Captcha captcha= new Gen_Captcha();
public static void main(String[] args) {
    Random randomGenerator = new Random();
    for(int i=0;i<5;i++){
        int random = randomGenerator.nextInt(62);
        System.out.print((myCaptchaLetters[random]));       
    }

}

}

}

注意：上面的代碼不包括顯示圖像的swing框架代碼。

Answer 1

創建一個List<BufferedImage> ，然后使用Collections.shuffle()將列表隨機化。 使用列表的迭代器將隨機訪問圖像，而不會重復。

Answer 2

但不知道如何用圖像映射這些否

不要映射數字，請映射字母：

Map<String, Image> images = new HashMap<String, Image>();
images.put("a", imageA);
images.put("b", imageB);

Answer 3

您可能想看看Graphics.drawString（）

您可以通過創建BufferedImage來獲取graphics2D對象。請注意，還有一些更改字體的方法。 對於更高級的驗證碼，您可以使用相同的api扭曲圖像並在其上繪制隨機內容。