生成圖片驗證碼工具類 Base64處理

本文轉載自查看原文 2020-03-15 18:31 656 工具類/ Base64/ 圖片驗證碼

加了一個轉成了Base64編碼。，其他的和網上一樣。

  1 public class ValidateCodeUtil {
  2 
  3     // 圖片的寬度。
  4     private int width = 160;
  5     // 圖片的高度。
  6     private int height = 40;
  7     // 驗證碼字符個數
  8     private int codeCount = 5;
  9     // 驗證碼干擾線數
 10     private int lineCount = 150;
 11     // 驗證碼
 12     private String code = null;
 13     // 驗證碼圖片Buffer
 14     private BufferedImage buffImg = null;
 15 
 16     private String base64 = null;
 17 
 18     public String getBase64() {
 19         try {
 20             base64 = getBase64(buffImg);
 21         } catch (Exception e) {
 22             System.out.println("轉換失敗");
 23         }
 24         return base64;
 25     }
 26 
 27     // 驗證碼范圍,去掉0(數字)和O(拼音)容易混淆的(小寫的1和L也可以去掉,大寫不用了)
 28     private char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
 29             'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
 30             'X', 'Y', 'Z', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
 31 
 32     /**
 33      * 默認構造函數,設置默認參數
 34      */
 35     public ValidateCodeUtil() {
 36         this.createCode();
 37     }
 38 
 39     /**
 40      * @param width  圖片寬
 41      * @param height 圖片高
 42      */
 43     public ValidateCodeUtil(int width, int height) {
 44         this.width = width;
 45         this.height = height;
 46         this.createCode();
 47     }
 48 
 49     /**
 50      * @param width     圖片寬
 51      * @param height    圖片高
 52      * @param codeCount 字符個數
 53      * @param lineCount 干擾線條數
 54      */
 55     public ValidateCodeUtil(int width, int height, int codeCount, int lineCount) {
 56         this.width = width;
 57         this.height = height;
 58         this.codeCount = codeCount;
 59         this.lineCount = lineCount;
 60         this.createCode();
 61     }
 62 
 63     public void createCode() {
 64         int x = 0, fontHeight = 0, codeY = 0;
 65         int red = 0, green = 0, blue = 0;
 66 
 67         x = width / (codeCount + 2);//每個字符的寬度(左右各空出一個字符)
 68         fontHeight = height - 2;//字體的高度
 69         codeY = height - 4;
 70 
 71         // 圖像buffer
 72         buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
 73         Graphics2D g = buffImg.createGraphics();
 74 
 75         /*// 將圖像背景填充為白色
 76         g.setColor(Color.WHITE);
 77         g.fillRect(0, 0, width, height);*/
 78         // 增加下面代碼使得背景透明
 79         buffImg = g.getDeviceConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT);
 80         g.dispose();
 81         g = buffImg.createGraphics();
 82         // 背景透明代碼結束
 83 
 84         // 畫圖BasicStroke是JDK中提供的一個基本的畫筆類,我們對他設置畫筆的粗細，就可以在drawPanel上任意畫出自己想要的圖形了。
 85         g.setColor(new Color(255, 0, 0));
 86         g.setStroke(new BasicStroke(1f));
 87         g.fillRect(128, 128, width, height);
 88 
 89         // 生成隨機數
 90         Random random = new Random();
 91         //設置字體類型、字體大小、字體樣式　
 92         Font font = new Font("微軟雅黑", Font.PLAIN, fontHeight);
 93 
 94         g.setFont(font);
 95 
 96         for (int i = 0; i < lineCount; i++) {
 97             // 設置隨機開始和結束坐標
 98             int xs = random.nextInt(width);//x坐標開始
 99             int ys = random.nextInt(height);//y坐標開始
100             int xe = xs + random.nextInt(width / 8);//x坐標結束
101             int ye = ys + random.nextInt(height / 8);//y坐標結束
102 
103             // 產生隨機的顏色值，讓輸出的每個干擾線的顏色值都將不同。
104             red = random.nextInt(255);
105             green = random.nextInt(255);
106             blue = random.nextInt(255);
107             g.setColor(new Color(red, green, blue));
108             g.drawLine(xs, ys, xe, ye);
109         }
110 
111         // randomCode記錄隨機產生的驗證碼
112         StringBuffer randomCode = new StringBuffer();
113         // 隨機產生codeCount個字符的驗證碼。
114         for (int i = 0; i < codeCount; i++) {
115             String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
116             // 產生隨機的顏色值，讓輸出的每個字符的顏色值都將不同。
117             red = random.nextInt(255);
118             green = random.nextInt(255);
119             blue = random.nextInt(255);
120             //指定某種顏色
121             //g.setColor(new Color(252, 145, 83));
122             g.setColor(new Color(red, green, blue));
123             g.drawString(strRand, (i + 1) * x, codeY);
124             // 將產生的四個隨機數組合在一起。
125             randomCode.append(strRand);
126         }
127         // 將四位數字的驗證碼保存到Session中。
128         code = randomCode.toString();
129     }
130 
131     public void write(String path) throws IOException {
132         OutputStream sos = new FileOutputStream(path);
133         this.write(sos);
134     }
135 
136     public void write(OutputStream sos) throws IOException {
137         ImageIO.write(buffImg, "png", sos);
138         sos.close();
139     }
140 
141     public BufferedImage getBuffImg() {
142         return buffImg;
143     }
144 
145     public String getCode() {
146         return code;
147     }
148 
149     public static void main(String[] args) {
150         ValidateCodeUtil vCode = new ValidateCodeUtil();
151         Map<String, Object> map = new HashMap<>(16);
152         map.put("code",vCode.getCode());
153         map.put("image",vCode.getBase64());
154         System.out.println(map);
155     }
156 
157     /**
158      * 轉換成圖片格式
159      * @param buffImg
160      * @return
161      * @throws Exception
162      */
163     private static String getBase64(BufferedImage buffImg) throws Exception {
164         ByteArrayOutputStream out = new ByteArrayOutputStream();
165         ImageIO.write(buffImg, "png", out);
166         byte[] bytes = out.toByteArray();
167         out.close();
168         String base64bytes = "data:image/png;base64," + Base64Util.encode(bytes);
169         return base64bytes;
170     }
171 }

Base64Util

  1 public class Base64Util {
  2 
  3     static private final int BASELENGTH = 128;
  4     static private final int LOOKUPLENGTH = 64;
  5     static private final int TWENTYFOURBITGROUP = 24;
  6     static private final int EIGHTBIT = 8;
  7     static private final int SIXTEENBIT = 16;
  8     static private final int FOURBYTE = 4;
  9     static private final int SIGN = -128;
 10     static private final char PAD = '=';
 11     static private final boolean fDebug = false;
 12     static final private byte[] base64Alphabet = new byte[BASELENGTH];
 13     static final private char[] lookUpBase64Alphabet = new char[LOOKUPLENGTH];
 14 
 15 
 16     static {
 17         for (int i = 0; i < BASELENGTH; ++i) {
 18             base64Alphabet[i] = -1;
 19         }
 20         for (int i = 'Z'; i >= 'A'; i--) {
 21             base64Alphabet[i] = (byte) (i - 'A');
 22         }
 23         for (int i = 'z'; i >= 'a'; i--) {
 24             base64Alphabet[i] = (byte) (i - 'a' + 26);
 25         }
 26 
 27         for (int i = '9'; i >= '0'; i--) {
 28             base64Alphabet[i] = (byte) (i - '0' + 52);
 29         }
 30 
 31         base64Alphabet['+'] = 62;
 32         base64Alphabet['/'] = 63;
 33 
 34         for (int i = 0; i <= 25; i++) {
 35             lookUpBase64Alphabet[i] = (char) ('A' + i);
 36         }
 37 
 38         for (int i = 26, j = 0; i <= 51; i++, j++) {
 39             lookUpBase64Alphabet[i] = (char) ('a' + j);
 40         }
 41 
 42         for (int i = 52, j = 0; i <= 61; i++, j++) {
 43             lookUpBase64Alphabet[i] = (char) ('0' + j);
 44         }
 45         lookUpBase64Alphabet[62] = (char) '+';
 46         lookUpBase64Alphabet[63] = (char) '/';
 47 
 48     }
 49 
 50 
 51     /**
 52      * base64 編碼
 53      *
 54      * @param str
 55      * @return
 56      */
 57     public static String encoder(String str) {
 58         final Base64.Encoder encoder = Base64.getEncoder();
 59         String strEncoder = null;
 60         try {
 61             strEncoder = encoder.encodeToString(str.getBytes("UTF-8"));
 62         } catch (UnsupportedEncodingException e) {
 63             e.printStackTrace();
 64         }
 65         return strEncoder;
 66     }
 67 
 68     /**
 69      * Encodes hex octects into Base64 
 70      *
 71      * @param binaryData Array containing binaryData 
 72      * @return Encoded Base64 array 
 73      */
 74     public static String encode(byte[] binaryData) {
 75 
 76         if (binaryData == null) {
 77             return null;
 78         }
 79 
 80         int lengthDataBits = binaryData.length * EIGHTBIT;
 81         if (lengthDataBits == 0) {
 82             return "";
 83         }
 84 
 85         int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
 86         int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
 87         int numberQuartet = fewerThan24bits != 0 ? numberTriplets + 1 : numberTriplets;
 88         char encodedData[] = null;
 89 
 90         encodedData = new char[numberQuartet * 4];
 91 
 92         byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
 93 
 94         int encodedIndex = 0;
 95         int dataIndex = 0;
 96         if (fDebug) {
 97             System.out.println("number of triplets = " + numberTriplets);
 98         }
 99 
100         for (int i = 0; i < numberTriplets; i++) {
101             b1 = binaryData[dataIndex++];
102             b2 = binaryData[dataIndex++];
103             b3 = binaryData[dataIndex++];
104 
105             if (fDebug) {
106                 System.out.println("b1= " + b1 + ", b2= " + b2 + ", b3= " + b3);
107             }
108 
109             l = (byte) (b2 & 0x0f);
110             k = (byte) (b1 & 0x03);
111 
112             byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
113             byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
114             byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);
115 
116             if (fDebug) {
117                 System.out.println("val2 = " + val2);
118                 System.out.println("k4   = " + (k << 4));
119                 System.out.println("vak  = " + (val2 | (k << 4)));
120             }
121 
122             encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
123             encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];
124             encodedData[encodedIndex++] = lookUpBase64Alphabet[(l << 2) | val3];
125             encodedData[encodedIndex++] = lookUpBase64Alphabet[b3 & 0x3f];
126         }
127 
128         // form integral number of 6-bit groups  
129         if (fewerThan24bits == EIGHTBIT) {
130             b1 = binaryData[dataIndex];
131             k = (byte) (b1 & 0x03);
132             if (fDebug) {
133                 System.out.println("b1=" + b1);
134                 System.out.println("b1<<2 = " + (b1 >> 2));
135             }
136             byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
137             encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
138             encodedData[encodedIndex++] = lookUpBase64Alphabet[k << 4];
139             encodedData[encodedIndex++] = PAD;
140             encodedData[encodedIndex++] = PAD;
141         } else if (fewerThan24bits == SIXTEENBIT) {
142             b1 = binaryData[dataIndex];
143             b2 = binaryData[dataIndex + 1];
144             l = (byte) (b2 & 0x0f);
145             k = (byte) (b1 & 0x03);
146 
147             byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);
148             byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);
149 
150             encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
151             encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];
152             encodedData[encodedIndex++] = lookUpBase64Alphabet[l << 2];
153             encodedData[encodedIndex++] = PAD;
154         }
155         return new String(encodedData);
156     }
157 
158     /**
159      * base64 解碼
160      *
161      * @param str
162      * @return
163      */
164     public static String decoder(String str) {
165         final Base64.Decoder decoder = Base64.getDecoder();
166         String strEncoder = null;
167         try {
168             strEncoder = new String(decoder.decode(str), "UTF-8");
169         } catch (UnsupportedEncodingException e) {
170             e.printStackTrace();
171         }
172         return strEncoder;
173     }
174 
175 }

運行實例：

{
image=　　//圖片
data:image/png;base64,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
, code=　　//驗證碼
P3V44
}

復制image結果到瀏覽器：

’

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