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Tesseract tesseract = new Tesseract();
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tesseract.setDatapath("src/tessdata");
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//识别库文件，默认就是eng，在src/tessdata下
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//扩充识别库：https://github.com/tesseract-ocr/tessdata
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tesseract.setLanguage("eng");
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//使用旧版本的模式 并设置只识别为数字/字母 不是用于识别验证码可不加下面两行
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tesseract.setOcrEngineMode(1);
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tesseract.setTessVariable("tessedit_char_whitelist","0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ");
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String result = tesseract.doOCR(ImageIO.read(new File("图片路径"));
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System.out.println(result);

1
public static void toBinary(File imageFile) throws IOException {
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    BufferedImage image = ImageIO.read(imageFile);
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    int w = image.getWidth();
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    int h = image.getHeight();
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    float[] rgb = new float[3];
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    double[][] pos = new double[w][h];
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    BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_BYTE_BINARY);
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    for (int x = 0; x < w; x++) {
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      for (int y = 0; y < h; y++) {
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        int pixel = image.getRGB(x, y);
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        rgb[0] = (pixel & 0xff0000) >> 16;
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        rgb[1] = (pixel & 0xff00) >> 8;
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        rgb[2] = (pixel & 0xff);
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        float avg = (rgb[0] + rgb[1] + rgb[2]) / 3;
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        pos[x][y] = avg;
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      }
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    }
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    double SW = 170;
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    for (int x = 0; x < w; x++) {
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      for (int y = 0; y < h; y++) {
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        if (pos[x][y] <= SW) {
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          int max = new Color(0, 0, 0).getRGB();
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          bi.setRGB(x, y, max);
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        } else {
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          int min = new Color(255, 255, 255).getRGB();
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          bi.setRGB(x, y, min);
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        }
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      }
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    }
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    ImageIO.write(bi, "png", imageFile);
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  }