加了一个转成了Base64编码。，其他的和网上一样。
1 public class ValidateCodeUtil { 2 3 // 图片的宽度。 4 private int width = 160; 5 // 图片的高度。 6 private int height = 40; 7 // 验证码字符个数 8 private int codeCount = 5; 9 // 验证码干扰线数 10 private int lineCount = 150; 11 // 验证码 12 private String code = null; 13 // 验证码图片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("转换失败"); 23 } 24 return base64; 25 } 26 27 // 验证码范围,去掉0(数字)和O(拼音)容易混淆的(小写的1和L也可以去掉,大写不用了) 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 * 默认构造函数,设置默认参数 34 */ 35 public ValidateCodeUtil() { 36 this.createCode(); 37 } 38 39 /** 40 * @param width 图片宽 41 * @param height 图片高 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 图片宽 51 * @param height 图片高 52 * @param codeCount 字符个数 53 * @param lineCount 干扰线条数 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);//每个字符的宽度(左右各空出一个字符) 68 fontHeight = height - 2;//字体的高度 69 codeY = height - 4; 70 71 // 图像buffer 72 buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 73 Graphics2D g = buffImg.createGraphics(); 74 75 /*// 将图像背景填充为白色 76 g.setColor(Color.WHITE); 77 g.fillRect(0, 0, width, height);*/ 78 // 增加下面代码使得背景透明 79 buffImg = g.getDeviceConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT); 80 g.dispose(); 81 g = buffImg.createGraphics(); 82 // 背景透明代码结束 83 84 // 画图BasicStroke是JDK中提供的一个基本的画笔类,我们对他设置画笔的粗细，就可以在drawPanel上任意画出自己想要的图形了。 85 g.setColor(new Color(255, 0, 0)); 86 g.setStroke(new BasicStroke(1f)); 87 g.fillRect(128, 128, width, height); 88 89 // 生成随机数 90 Random random = new Random(); 91 //设置字体类型、字体大小、字体样式 92 Font font = new Font("微软雅黑", Font.PLAIN, fontHeight); 93 94 g.setFont(font); 95 96 for (int i = 0; i < lineCount; i++) { 97 // 设置随机开始和结束坐标 98 int xs = random.nextInt(width);//x坐标开始 99 int ys = random.nextInt(height);//y坐标开始 100 int xe = xs + random.nextInt(width / 8);//x坐标结束 101 int ye = ys + random.nextInt(height / 8);//y坐标结束 102 103 // 产生随机的颜色值，让输出的每个干扰线的颜色值都将不同。 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记录随机产生的验证码 112 StringBuffer randomCode = new StringBuffer(); 113 // 随机产生codeCount个字符的验证码。 114 for (int i = 0; i < codeCount; i++) { 115 String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]); 116 // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。 117 red = random.nextInt(255); 118 green = random.nextInt(255); 119 blue = random.nextInt(255); 120 //指定某种颜色 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 // 将产生的四个随机数组合在一起。 125 randomCode.append(strRand); 126 } 127 // 将四位数字的验证码保存到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 * 转换成图片格式 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 编码 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 解码 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 }
运行实例：
{
image= //图片
data:image/png;base64,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
, code= //验证码
P3V44
}
复制image结果到浏览器：
’