java实现二维码

说起二维码，微信好像最先启用，随后各类二维码就开始流行起来了。那什么是二维码呢。

1.什么是二维码？百度一下即可

http://baike.baidu.com/view/132241.htm?fr=aladdin

2.java开发二维码？

　　2.1：首先导入：aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFEAAABBCAIAAAAmO9/6AAAUhUlEQVRogeWaa1RTV77AWTOQMKvjx5m5vV+uHWtVtIzMjM4F5A29IjrQNcRWQ0uCNbwSWylPK+ArykOQaBBRAxhEJDyVJJAX2TsJoqggylMBeUlAApSninrP/XCSk5MXxNppP9z/+q2zDvsR+P3/e+9zYGGzYYNDZ1fHhvVmrl1dHestXzuX7bXu2r5+/caurvb16x26uzrWWX9d59Dd3f7JOoee7o5P1jn06O7jL6qivW2jvW3pPnYMXwLdxw6D4UvAsFEogVIFlSqoUAEUpUrbYgkxVNyUqXiipivCO+8JT9R0U6aSQIVKBRp13DKhsVHPLQt8ss4B73zAj2jZWQGVSqhQQIUSoCiVQKmESiVUau8NEMsVVQ33wN2O7v6h2dnZhYWFFz8pFhYWZmdnu/uHwN2OqoZ7ErmiUQUalcbcwqOCt1TQNCMoPd0dcfla52jv30R7/wbzNzK3gQqoRQlQdPL6LGDUy5UVsrutXX3z8/OvX79++/Yt8h7x9u3b169fz8/Pt3b1VcjuioFCpQRGGKRABRtVsBG3IvCsW+dg5Iy3xZf6nZxhlVgpu/1wbm7uzZs3/2t1vH7e93bphaXeN2/ezM3NyW4/rBZb6WzevNukzmYXNsOXYAMUUIsSAJ22OSBUQm4tbO/pf/ny5Vur483i7ELz1Tfzk8uMefnyZXtPf3Gtmd2E91eqgEoFdQAjLNUZb3vAj3jAj2gDFFAOoRxCuQKA5YBAAXPL5RqN5tWrV2+sjFcvZhUXZkXprxdnlxv16pVGo8ktlysUwAglDoUSKpRQqcCOG4McdXWZr/P7OAOggGevSzUazdLS0mtr4uX8jDRrPM1z8TFEG5ZezL02N3dpaUmj0Zy9Ll3eWanQOSvMnLLr11vcz2bWthwC65xBdoloYmLi1atXSyvFq5nx6Rspo0kbfhRlLC0tvXjaPNdc+mKwZenlCzODX72amJjILhFpD44VnKFS8Q51NnOGAQjlAMgBBBCsSCZXOD4+/uLFi5fLxqK6Z4Lz9WjiumnR6cXh9qmaHyaLw2fkuYvqHrPjX7x4MT4+nskValUh7pDBoVBAhQI9WKASAqUC4jNiWGc9Zp5VDQA2QIBHbplThbVjY2OLi4vLPHjnhx49ZwWMxn4001g0P9r1nBXwPMd/tq12mSmLi4tjY2OnCmshBMYojFHo5BUKqFsOUKEAnWidvey0mLP9Kc4nLteo1eqFhYVFC7EwNTpRGDry7YfTkpzFGc34mf8ZS3OfG3xoabx21sKCWq0+cbnmPZzhBrTOmLOX+YXN8CXYyACUQYCnwTJHLlSMjo7Oz88vWIiZR6Jnsf81luW7MDsz3Vg0zPjjtIJjaTAW8/Pzo6OjRy5UaA8O/IYyOVMgBPp3Cm0iIFTAjs4Oa52lAEohMEJmgcO5ZSMjI7Ozs3MW4sdO8Czhk4li2tzcnEZwcoT+h4lr9LnpSUvj0ZidnR0ZGTmcWyZXALnCcHEpjAEQ4Ha8/jnqsMHqOkuBsfAyzomsa8PDwzMzM7OWYkozfmW/+tjffhx4NN1W9+zgf44c+OPkrasWx8/Ozs7OzszMDA8PJ7KuvY/zO9RZIgcSYIDUMrHZ3MHBwenp6R8tx8xg51ia+3hl0o9Tk+PciOGIVaMZ3j+qB5eZMj09PTg4GJvN1W4igMNkf8kB0L5QQKhLDZRD6OBgdZ3fyfm7jMKBgYGpqalpczE1Pa2Zmpqenh54oJg/s2OyuWL6We/ooQ3qE87T6iF0zOTUlMZk+tTU1MDAwHcZhe/j3NFhXOdoHz0GzuIGIJYbILEM/dSl/v5+jUYziQvN5OTY+PP+oRHY3Ca//eDxwLPJyUlNq2QMXtH0tU5kb1crSicnJyc0mhH1mKyplVMlEavuGXyCRtPf308/dUkGgAwAmRwHMKZBDhoA1IGmBjYAuNGkzss4Q3EDMDU3S8TxvL6+vgnD6BscPl8qjMkoyCyorlfcfdjd2zc43Ds0+nRoVN1Y1S0rffh46GF33+0Hnc1tXdKmVubFcnJijvGH9PVFHM9DMyvFY7LWZHIgA1CHPhePcHWmexPo3oQob9sob1vUme5LoGPv22IZFMuAWAa05svyTSq7t7f3uWE86noSn33lq0Nnvz11+VwJP+fqzawr1Uxu/RluTcHF/KPs4m9ZlScvV/LqlL1PB9EpB05dNvqQ3t7eb1LZkgYgaQBSPHJjZA1AJoc69Cti00YHa53rZUCE0bAClMM5jx8/HjOMZ2r108Hhts7HZXWQe0MmvXVf0nhPorpbr7wnbHygvNv+sPPxk/6BoZERdHxTSzs54YzRhzx+/JhyOAfNrASPyf6SNgCpHOrQ5+Jh+8p1ZvgRGX5EmzoZqJOBepSGFQhJzOrp6VGbi/aeJ7GnC1Nzr0kb76nuPmxp725p71bdbRMpm68LYY20se/pgFqtVjS30ZkXD2YUGE3v6ekJScxCM2uwuEz2l6QBSORQhz4Xn1pRZwNnM9pmUgC/jMvo6up6Zi46up/kcG98l84JP5q3PzX3m9Rc2pHzEcfywpLZYcnso+dL7z/qgndaz1y5kXuN39nTazS9q6vry7iM93F+hzoLpQClzhQZHlgng8EHT3Z2do5YiKHhYb686absVj28U16vqBApJKp78E5rW0f3wNDQwNDQrfsP77Q+Mju3s7Mz+OBJNO+iZbebWAbEDVCHPjuOm6yvsxRa1DYUrpPBzw8cX8a54dZ9yuFzh89eLRPCWnlTraypvE6RVyrILqqBt1stzcKcPz9w/H2cHzwyU+dIH/N1hgIpQBEaIcOAKLuij3R3d48axsPOx9XSRiFslje1nMgv35d6npyU86+Y06TvT+9JOBOSxKKfvFx8owE/pbd/0OhDuru7d0UfMdhlFo4YkQyIGqCoARrl4i+6Okd529G9CdE+lp0FEq2wQKJDKtfdGLMjItnIuaBaEpNZdOpy5d22zoHBoeGRZ4+6exXNbXz5HQG4I73Vcqe1o7On7+ngEDblGh9kX7lh6rwjItlwocE6KayTwXoDgCXQOkd62UZ420Z522FE+xCifQh0XyLdl8jws2f42dvwxcAAiRwHMOKz/Ye6urrUavW4LiJOXPrX91nfHM1PK6jhVEmFsFlyqwVFrLuKG1s4VdJz1wTHLpQfzCiKzS6+Kb8zjgu1Wt3V1fXZ/kNCCcABhRIolEIhKq/F3LkjBXVSsHmTQ1y+KsLbNsLbNtLHLtLHsnOtkbOBubFzaGJ6dZ1UrVZj708Pu/vqlPcu8MRH8soTWCVRJzn7j+XTjl+iHb8UfuISekM7fol+quBw7vWcEkGN7E774/6x58/xL2Fqtbq6TkpJTP+JzjJQJwOtjzpQZ1R4OeebYlBrhMQih7IunsrjjoyMaDSaqZ8pNBrNyMjIqTzuD1kX9ftLAgQSKJBAgRQKpFpzIe64NT13nD51iMtXYcIrOKNY43y+uDKQFl9SLRwfH0d/o5x5j0B/ixwfHy+pFgbS4i8UV76Pc8vDjriL1jnfEAGUmxji5WBzK/5Ji49n5lTwRWq1euw9Qq1WV/BF8cycf9Liz3MrTLYY5IshXwL5qLwWYAYpEEiBk6MD5hzlS4jyJSzjDGtEAOWGCNwQr8y5KxVx6XlfHDzm/OWB9+TLg8fi0vPOXakwTW6tGNaKYa1ED1+L8SnDl0K+FN5v09ZZK/zzOuuAOMANMbgphiaAm2Js7VjotcC7Ov9NV+eVnWvqoQ6gRYQBa3AZwbXAGhG8gcO0xTqAWW6KoB5zOdKmQwx1ZxCsFcN7bR1x+Y2R3sQoH3vUGfXEVDFsquuhDqBFhAGrRRD3JdYCq3HyNeZarAOYxSAvJqvJcEHpV9DfHR0sORtp21TVgeo6aIA+BYa50LfAav3qgDXmWqwDmOVGPdRjbl0YLAQddx/g6uxjH+Vjb9G5sg5U1UFj6mFVPaiqx24wIAbe37TFOoBZDPJibl2Y3Sl//4vD/zvnd6hzRR2orIMG1KMA3A0G1gvx/qYteK5WCvO5vOzznOOZrOOZrOzznHwu72qlEM3j1UpBPrcM33uRyyupFKJ5KakSXizmncnjnMhknchkncnjXCwuu1YlND0dtlhf5wohNKYOBeBuMLBegzSZtmAUVwizcjkJ5d26/5wZE51OSkhhZuVyiisExRWCrFxOQkpNm7b3QWkK83gGK/8Kr6oOXq0QZp/nJKZivWOi04mJqcwz5zlYUjCaW62v8y/hLG+fUJ36PumLEOrOM80I0nwuhJqQwrxwpay4QpCVW9Uw0V30feIXIZSs2whyLz8snHE8g3W1Qph/hZeYeqlmFBmujPX28/dOa0KQO+dCKEmpzItcnpHzls1W17lcAMsF8ApPeL6Ql8nmHE1nHU1nZbI5GGiLpUY8x9JZp9mcvCIet1yIZZBbLjzN5iSkMOkxSTuDSFudT8iRAW6oGzWccZrNMe49qkSGyg4EBSekMLnlgtNsTtgx0RDSdMTZbauz21ZnKncQUaVtDwunZ+dycAcQqKoDd1q0dca06b5E/J8KMGxQ4Uw2Jz655oFu/U3cKolPYUbHXH+g/2+ujsKYJGo4gxp+iq9GmnPzWxAEUYtSwhnU8KIWbOFKWAkpTFTGyJkazviHi9sfvhMjSH3cx2u/CAlDhx1LZ1HDGTuDSB+tWfutGBko2OPl5486H0tn7cppRkDyR2vWbnJ02uToFCdDBgr27PqcdDyDZeS81cnBwFn7fCaYatuUC+D5Ql58ck0zggxXxO4mU6NjkuJTmNTwotsIMlzx/W4yZTeZsju3BUGajzi7bXUO4w4iCKI8HUQKCCIFBLFUyDA3FK1D2LUh5PYZEjWckZDCPJbOwkAr6RVR1o8gou8+3OToZFBntmoMQRAEkR922uTo9A8XN3pMYl5RWUIKc//1YQQkb3J02vX57l2fk34AyEDBHu/P/JNST65Q52WceXyYeY5D4bQhgyWkTzd7+vpTaIzomKSA7GZkoJD06WZP3+2evtu9fKM5A0h91KoPPvA4+wQRffsfW5zdtji7bTmqNPrvvuGKWCqtqF371WRTKSeTzTmaxjoDNQjyDM1OQCApPpl5vpCH31ZfhIQdUSBI/yWSoxOVRs9kcxJSmF5pTajzzqDdO4O0zl5+/okpJyuFUAeoFIJ/WF/nMj5MTWMFnGlG+vI8Vq1avWatp59/QNDu1fEy5EmOx6pVGx2dNjo6bXTcc7a3N8fFxsbGJecJIqTZrF6zdvWategwFxubD36/6o9/+nDjp5u3OLsFBJKiY5KOpLFQ4pKZ+a0Ici/fy8/fy8+fRKZSaIy4ZCbWixIQtHur8wkp8vRi0NqAwODomMTdIdSNhyGahZ1Bu3cGxXIGEPlhJy8//4SUk7hzF1QIQZP1ddY6B50VIUh99KrVa9Z6+WXyKuJWf5wgRJAnZz20zoch0nvWxUbvvNXZzdPP38svU4QgQprW+RAARwyd45KZlKOiIaTpkKPTR2vWbnR0CggkkchUylGRGhmrPcogJfGf3csnkakbHZ12XXqK9OX5/enDLaFXh5Fn1yL8P/o4KLcPkcav3eTotAnz/5x0LJ1l5PzfRnXGnWHGztf5MP0cJ5TG2PJ1yVPtgmxmkalbnN1W/zlerl+zTUmfbv7gg9+ja1v+w+ZgMjWUxgilMbaElvRjg7JJJDI1lMaIS2amprFS01hxycxQThtiGA+uJkVlykeRsdqjjFAagyl5jv8uq//8MerM+zZ4i7Pbxt2Fg9pe5RHnbZ5+2ynh9Ew2hyeE5UKAYVxnH/toPyIG/TN7DJvrfMgu4MUeZgbvpe4IJO0IJKEyOwJJHr7+OwKDg8mUYDIlmEzdEUjS7mFntx2BpMiYpNhkZmwyE+0KxqlmsDmFPGGZAJYJILuQF5fMJJGpOwJJJDI1KiYJTURUTBKaslAaIyomKS6ZGUpjkMiUHYHBnr7bdwQGk8gUEpkSEEjy9PVHr55+2wOCgklkSlwKM7eIZ+RsWmfLzgJYUCZMP8eJTWZG6n6OyINJoTR6KI0RGZOIB/spI2OSUtJYGWxOBpsTl8KMiklCMeucmsZCDbEBZp2jY5JQQml0DAqNgZ6pFBqDEk6PjkmMS2FmsjlF5QKeEKCgzo0tHXH5jRFeBFQ70puo/+OBLwHvb1MqgKV8yOEJzxXy0ticlDRWShorjc1JO8dJY3OwFm0jjnOFvAKesIAnZBfx0tmclHRWShornc1hF/IKeMLrAohSwBOyC3npuM/Bk87mYKB7IQPXks7mZOhITWOlprMy2Bx2UVlhuaBMCDBQcxcnh7h8VYQXAdO27MyHpbWwlG9CLSjlw1I+MMRgzHUUnd51/ntRpuM6H2CU4dsFAKPMhMaWDmudVfc7tv3VQWnu6vpXB9UveG283+HyV4dG69pdnBwaW4yvmDOqbdE5Nr/RAirdVWV5jAFxFjDtXWmiyhBL7WYI97SL8CJEehEivQgWnUNc7UNc7ckuRLILca8zYa8zAb0PcSWEuBJCXO2+2kawxNduxK/diKHu9ijUbUSzUFwJFFeCaQsG2hjmZh/mRghzI1C32WGgLdp2d1uMMA+7MA+7fVp++42nLc3DluZha5Uz2YW4ojPq9rUb8Vd3DvUw77zP47eYc7inndZZ90tllI99tO/vMLTOIa72qDBKiKv9T3CmuP1aznbv5rzXhbjHmbDXhbjXhUh2tUfZ60Lc62r31TaiqaGpOQbV3R6F4kakuBFDtxGWh+Jqaxa8Mx6Kmx3VnYBnnztxn4fdfnc7mgcBJcKDGOlprwV7UOPko3zsl3M23c+/urOR9j534j534n53vXaEB1GvrXM20n43Z3y1TfllnPHa6Jr/+Z1RrNH+xZwxbbwzqh3urtWO8CDi30Px2jZ7nAnWOOO1/93OFsE74483d1v8rg73JKLg30/w5padXYhkFzu8M6b9azmHbrMN3WaLOeu13W3D3G3xK9zI2Uh7BWeyi53uoUUIcSV8tY24DL+MM6pt8Dyz6GyPEen9O4z/A2mJSIYTYch0AAAAAElFTkSuQmCC" alt="" />此包

　　下载地址：http://pan.baidu.com/s/1jGJwPwU

　　

　　2.2:java类

　　

 import java.awt.image.BufferedImage;
 
 /**
  * Encapsulates custom configuration used in methods of {@link MatrixToImageWriter}.
  */
 public final class MatrixToImageConfig {
 
   public static final int BLACK = 0xFF000000;
   public static final int WHITE = 0xFFFFFFFF;
 
   private final int onColor;
   private final int offColor;
 
   /**
    * Creates a default config with on color {@link #BLACK} and off color {@link #WHITE}, generating normal
    * black-on-white barcodes.
    */
   public MatrixToImageConfig() {
     this(BLACK, WHITE);
   }
 
   /**
    * @param onColor pixel on color, specified as an ARGB value as an int
    * @param offColor pixel off color, specified as an ARGB value as an int
    */
   public MatrixToImageConfig(int onColor, int offColor) {
     this.onColor = onColor;
     this.offColor = offColor;
   }
 
   public int getPixelOnColor() {
     return onColor;
   }
 
   public int getPixelOffColor() {
     return offColor;
   }
 
   int getBufferedImageColorModel() {
     // Use faster BINARY if colors match default
     return onColor == BLACK && offColor == WHITE ? BufferedImage.TYPE_BYTE_BINARY : BufferedImage.TYPE_INT_RGB;
   }
 
 }

 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.IOException;
 import java.io.OutputStream;
 
 import javax.imageio.ImageIO;
 
 import com.google.zxing.common.BitMatrix;
 public class MatrixToImageWriter {
      private static final int BLACK = 0xFF000000;
        private static final int WHITE = 0xFFFFFFFF;
 
        private MatrixToImageWriter() {}
 
        public static BufferedImage toBufferedImage(BitMatrix matrix) {
          int width = matrix.getWidth();
          int height = matrix.getHeight();
          BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
          for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
              image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
            }
          }
          return image;
        }
 
        public static void writeToFile(BitMatrix matrix, String format, File file)
            throws IOException {
          BufferedImage image = toBufferedImage(matrix);
          if (!ImageIO.write(image, format, file)) {
            throw new IOException("Could not write an image of format " + format + " to " + file);
          }
        }
 
        public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)
            throws IOException {
          BufferedImage image = toBufferedImage(matrix);
          if (!ImageIO.write(image, format, stream)) {
            throw new IOException("Could not write an image of format " + format);
          }
        }
 }

test类：

 import java.io.File;
 import java.util.Hashtable;
 
 import com.google.zxing.BarcodeFormat;
 import com.google.zxing.EncodeHintType;
 import com.google.zxing.MultiFormatWriter;
 import com.google.zxing.common.BitMatrix;
 
 public class Test {
 
     public static void main(String[] args) throws Exception{
         String text = "http://www.baidu.com";//二维码的内容
         int width = 400;
         int height = 400;
         String format = "png";
         Hashtable hints= new Hashtable();
         hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
         BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height,hints);
         File outputFile = new File("E:/codeImg");
         MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
         System.out.println("It is ok!");
 
     }
 }

以上用的是一个谷歌提供的开源框架首先的，呵呵。。。站在巨人的肩膀上使用....

效果图：

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" 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