package image.images;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.io.FileUtils;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
/**
 * 負責爬去驗證碼圖片
 * @author FMm
 *
 */
public class HttpClientImage {

    public static void main(String[] args) throws ClientProtocolException, IOException, InterruptedException {
        // 創建httpClient實例
        CloseableHttpClient httpClient = HttpClients.createDefault();
        // url 
        String url = "http://con.monyun.cn:9960/aut_checkCode.hts?iden=1422083454409442236&t=0.06292891333169814";
        // 循環爬去20張驗證碼
        for (int i = 0; i < 20; i++) {
            // 休眠一下否則圖片加載不出來，
            Thread.sleep(2000);
            // 創建請求
            HttpGet httpGet = new HttpGet(url);
            // 執行請求
            CloseableHttpResponse response = httpClient.execute(httpGet);
            // 獲取實體對象
            HttpEntity httpEntity = response.getEntity();
            if (httpEntity != null) {
                // 打印返回類型保證是圖片類型
                System.out.println("Content-Type:" + httpEntity.getContentType().getValue());
                // 獲取InputStream流
                InputStream inputStream = httpEntity.getContent();
                // 文件復制，common io 包下，需要 引入依賴
                FileUtils.copyToFile(inputStream, new File("/Users/mac/Desktop/image/" + i + ".png"));
            }
        }
        httpClient.close();
    }
}

package image.images;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.imageio.ImageIO;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;
import javax.net.ssl.HttpsURLConnection;
/**
 * 圖片背景處理，提高識別度
 * @author FMm
 *
 */
public class ImageConverter {

    private static List<File> fileList = new ArrayList<File>();

    public static void main(String[] args) {

        // 圖片所在的根目錄 , 圖片去除水印后的存儲目錄
        // 支持批量去除圖片水印，第一個參數為圖片存在目錄，第二為新建圖片目錄
        convertAllImages("/Users/mac/Desktop/image/", "/Users/mac/Desktop/images/"); 
    }

    private static void convertAllImages(String dir, String saveDir) {
        File dirFile = new File(dir);
        File saveDirFile = new File(saveDir);
        dir = dirFile.getAbsolutePath();
        saveDir = saveDirFile.getAbsolutePath();
        loadImages(new File(dir));
        for (File file : fileList) {
            String filePath = file.getAbsolutePath();

            String dstPath = saveDir + filePath.substring(filePath.indexOf(dir) + dir.length(), filePath.length());
            System.out.println("converting: " + filePath);
            replaceColor(file.getAbsolutePath(), dstPath);
        }
    }

    public static void loadImages(File f) {
        if (f != null) {
            if (f.isDirectory()) {
                File[] fileArray = f.listFiles();
                if (fileArray != null) {
                    for (int i = 0; i < fileArray.length; i++) {
                        loadImages(fileArray[i]);
                    }
                }
            } else {
                String name = f.getName();
                if (name.endsWith("png") || name.endsWith("jpg")) {
                    fileList.add(f);
                }
            }
        }
    }

    @SuppressWarnings("unused")
    private static void replaceFolderImages(String dir) {
        File dirFile = new File(dir);
        File[] files = dirFile.listFiles(new FileFilter() {
            public boolean accept(File file) {
                String name = file.getName();
                if (name.endsWith("png") || name.endsWith("jpg")) {
                    return true;
                }
                return false;
            }
        });
        for (File img : files) {
            replaceColor(img.getAbsolutePath(), img.getAbsolutePath());
        }
    }

    private static void replaceColor(String srcFile, String dstFile) {
        try {
            Color color = new Color(255, 195, 195);
            replaceImageColor(srcFile, dstFile, color, Color.WHITE);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void replaceImageColor(String file, String dstFile, Color srcColor, Color targetColor)
            throws IOException {
        URL http;
        if (file.trim().startsWith("https")) {
            http = new URL(file);
            HttpsURLConnection conn = (HttpsURLConnection) http.openConnection();
            conn.setRequestMethod("GET");
        } else if (file.trim().startsWith("http")) {
            http = new URL(file);
            HttpURLConnection conn = (HttpURLConnection) http.openConnection();
            conn.setRequestMethod("GET");
        } else {
            http = new File(file).toURI().toURL();
        }
        BufferedImage bi = ImageIO.read(http.openStream());
        if (bi == null) {
            return;
        }

        Color wColor = new Color(255, 255, 255);// 白色

        for (int i = 0; i < bi.getWidth(); i++) {
            for (int j = 0; j < bi.getHeight(); j++) {
                System.out.println(i + "---" + j);
                int color = bi.getRGB(i, j);
                Color oriColor = new Color(color);
                int red = oriColor.getRed();
                int greed = oriColor.getGreen();
                int blue = oriColor.getBlue();
                // 以下if處是則改變圖片顏色 將圖片背景改變成純白色，提高識別度
                if (i < 4 | i > 100) {
                    bi.setRGB(i, j, wColor.getRGB()); 
                    //bi.setRGB（）方法是把對應的xy坐標的顏色改變成純白色Color wColor = new Color(255, 255, 255);// 白色
                }

                if (j < 4 | j > 35) {
                    bi.setRGB(i, j, wColor.getRGB());
                }

                if (red < 107 && greed < 107 && blue < 107) {
                    bi.setRGB(i, j, wColor.getRGB());

                }
                if ((red <= 255 && red > 200) & (greed <= 255 && greed >= 200) & blue <= 255 && blue >= 200) {
                    bi.setRGB(i, j, wColor.getRGB());
                }
            }
        }
        String type = file.substring(file.lastIndexOf(".") + 1, file.length());
        Iterator<ImageWriter> it = ImageIO.getImageWritersByFormatName(type);
        ImageWriter writer = it.next();
        File f = new File(dstFile);
        f.getParentFile().mkdirs();
        ImageOutputStream ios = ImageIO.createImageOutputStream(f);
        writer.setOutput(ios);
        writer.write(bi);
        bi.flush();
        ios.flush();
        ios.close();
    }
}

package image.images;

import java.io.File;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import net.sourceforge.tess4j.ITesseract;
import net.sourceforge.tess4j.Tesseract;
import net.sourceforge.tess4j.TesseractException;
/**
 * 讀取驗證碼并返回結構
 * @author FMm
 *
 */
public class ReadImage {

    public static void main(String[] args) throws TesseractException {
         ITesseract instance = new Tesseract();
            //如果未將tessdata放在根目錄下需要指定絕對路徑，tessdata包下是tess4j訓練語言包
            instance.setDatapath("/Users/mac/Desktop/tessdata");
            //如果需要識別英文之外的語種，需要指定識別語種，并且需要將對應的語言包放進項目中
            instance.setLanguage("eng");
            // 指定識別圖片路徑
            File imgDir = new File("/Users/mac/Desktop/images/8.png");
            long startTime = System.currentTimeMillis();
            String ocrResult = instance.doOCR(imgDir);
            System.out.println(ocrResult);
            if(isStartWithNumber(ocrResult)) {
                String start = ocrResult.substring(0,1);
                 String meg = ocrResult.substring(1,2);
                 String end = ocrResult.substring(2,3);
                // 輸出識別結果
                System.out.println("OCR Result: \n" + ocrResult + "\n 耗時：" + (System.currentTimeMillis() - startTime) + "ms");
                // 得出結果
                System.out.println(start+meg+end+"="+(Integer.parseInt(start)+Integer.parseInt(end)));
            } else {
                System.out.println("僅支持數字");
                return;
            }
           
           
    }
    
    public static boolean isStartWithNumber(String str) {
           Pattern pattern = Pattern.compile("[0-9]*");
           Matcher isNum = pattern.matcher(str.charAt(0)+"");
           if (!isNum.matches()) {
               return false;
           }
           return true;
        }
}

maven文件

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>image</groupId>
    <artifactId>images</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>images</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.8</version>
        </dependency>
        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.12.1</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>net.sourceforge.tess4j</groupId>
            <artifactId>tess4j</artifactId>
            <version>4.4.1</version>
        </dependency>
    </dependencies>
</project>

不是maven項目所需jar

org/apache/httpcomponents/httpclient/4.5.8/httpclient-4.5.8.jar

org/apache/httpcomponents/httpcore/4.4.11/httpcore-4.4.11.jar

commons-logging/commons-logging/1.2/commons-logging-1.2.jar

commons-codec/commons-codec/1.11/commons-codec-1.11.jar

org/jsoup/jsoup/1.12.1/jsoup-1.12.1.jar

commons-io/commons-io/2.5/commons-io-2.5.jar

com/alibaba/fastjson/1.2.47/fastjson-1.2.47.jar

junit/junit/3.8.1/junit-3.8.1.jar

net/sourceforge/tess4j/tess4j/4.4.1/tess4j-4.4.1.jar

net/java/dev/jna/jna/5.4.0/jna-5.4.0.jar

com/github/jai-imageio/jai-imageio-core/1.4.0/jai-imageio-core-1.4.0.jar

org/ghost4j/ghost4j/1.0.1/ghost4j-1.0.1.jar

log4j/log4j/1.2.17/log4j-1.2.17.jar

commons-beanutils/commons-beanutils/1.9.2/commons-beanutils-1.9.2.jar

commons-collections/commons-collections/3.2.1/commons-collections-3.2.1.jar

org/apache/xmlgraphics/xmlgraphics-commons/1.4/xmlgraphics-commons-1.4.jar

com/lowagie/itext/2.1.7/itext-2.1.7.jar

org/apache/pdfbox/pdfbox/2.0.17/pdfbox-2.0.17.jar

org/apache/pdfbox/fontbox/2.0.17/fontbox-2.0.17.jar

org/apache/pdfbox/pdfbox-tools/2.0.17/pdfbox-tools-2.0.17.jar

org/apache/pdfbox/pdfbox-debugger/2.0.17/pdfbox-debugger-2.0.17.jar

org/apache/pdfbox/jbig2-imageio/3.0.2/jbig2-imageio-3.0.2.jar

net/sourceforge/lept4j/lept4j/1.12.3/lept4j-1.12.3.jar

org/jboss/jboss-vfs/3.2.14.Final/jboss-vfs-3.2.14.Final.jar

org/jboss/logging/jboss-logging/3.1.4.GA/jboss-logging-3.1.4.GA.jar

ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar

ch/qos/logback/logback-core/1.2.3/logback-core-1.2.3.jar

org/slf4j/slf4j-api/1.7.25/slf4j-api-1.7.25.jar

org/slf4j/jul-to-slf4j/1.7.28/jul-to-slf4j-1.7.28.jar

org/slf4j/jcl-over-slf4j/1.7.28/jcl-over-slf4j-1.7.28.jar

org/slf4j/log4j-over-slf4j/1.7.28/log4j-over-slf4j-1.7.28.jar

所需的tess4j文件，文件名稱：tessdata/，這個文件你可以放在項目中，也可以放在其他位置但是路徑不能寫錯

tessdata/

chi_sim.traineddata // 中文識別
eng.traineddata //數字識別 下載地址https://raw.githubusercontent.com/tesseract-ocr/tessdata/master/eng.traineddata
osd.traineddata
pdf.ttf
pdf.ttx
readme