Java 验证码识别（Tess4J初体验）「建议收藏」

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发布于 2022-08-13 11:00:06

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Tess4J官方描述：A Java JNA wrapper for Tesseract OCR API.

demo下载

1.先去官网下载：http://tess4j.sourceforge.net/

2.将下载的文件解压后把下面几个文件夹（图片中选中的）复制到新建的项目中

3.将lib下的jar包加到build path 中。注意：lib里面除了jar包还有别的。

4.根据官网的样例在刚建的项目中使用一下：

The following code example shows common usage of the library. Make sure tessdata folder are in the search path, and the .jar files are in the classpath.注意在第4步之前确保tessdata 文件夹在项目中，jar包在classpath中。前面的2,3两步已经做了。

[java] view plain copy

package net.sourceforge.tess4j.example;
import java.io.File;
import net.sourceforge.tess4j.*;
public class TesseractExample {
public static void main(String[] args) {
File imageFile = new File(“eurotext.tif”);
ITesseract instance = new Tesseract(); // JNA Interface Mapping
// ITesseract instance = new Tesseract1(); // JNA Direct Mapping
try {
String result = instance.doOCR(imageFile);
System.out.println(result);
} catch (TesseractException e) {
System.err.println(e.getMessage());
}
}
}

我稍微改了一下，识别指定文件夹下所有验证码

[java] view plain copy

package blog.csdn.net.dr_guo;
import java.io.File;
import net.sourceforge.tess4j.ITesseract;
import net.sourceforge.tess4j.Tesseract;
import net.sourceforge.tess4j.TesseractException;
/**
* 验证码识别（图片名即为验证码数字）
* @author drguo
*
*/
public class VCR {
public static void main(String[] args) {
File root = new File(System.getProperty(“user.dir”) + “/imgs”);
ITesseract instance = new Tesseract();
try {
File[] files = root.listFiles();
for (File file : files) {
String result = instance.doOCR(file);
String fileName = file.toString().substring(file.toString().lastIndexOf(“\\”)+1);
System.out.println(“图片名：” + fileName +” 识别结果：”+result);
}
} catch (TesseractException e) {
System.err.println(e.getMessage());
}
}
}

直接运行就行了，但这时可能会报错

[plain] view plain copy

Exception in thread “main” java.lang.UnsatisfiedLinkError: Unable to load library ‘libtesseract304’: Native library (win32-x86-64/libtesseract304.dll) not found in resource path ([file:/G:/Eclipse/Demo/bin/, file:/G:/Eclipse/Demo/lib/commons-beanutils-1.9.2.jar, file:/G:/Eclipse/Demo/lib/commons-io-2.4.jar, file:/G:/Eclipse/Demo/lib/commons-logging-1.2.jar, file:/G:/Eclipse/Demo/lib/ghost4j-1.0.1.jar, file:/G:/Eclipse/Demo/lib/hamcrest-core-1.3.jar, file:/G:/Eclipse/Demo/lib/itext-2.1.7.jar, file:/G:/Eclipse/Demo/lib/jai-imageio-core-1.3.1.jar, file:/G:/Eclipse/Demo/lib/jna-4.2.2.jar, file:/G:/Eclipse/Demo/lib/jul-to-slf4j-1.7.19.jar, file:/G:/Eclipse/Demo/lib/junit-4.12.jar, file:/G:/Eclipse/Demo/lib/lept4j-1.1.2.jar, file:/G:/Eclipse/Demo/lib/log4j-1.2.17.jar, file:/G:/Eclipse/Demo/lib/logback-classic-1.1.6.jar, file:/G:/Eclipse/Demo/lib/logback-core-1.1.6.jar, file:/G:/Eclipse/Demo/lib/rococoa-core-0.5.jar, file:/G:/Eclipse/Demo/lib/slf4j-api-1.7.19.jar, file:/G:/Eclipse/Demo/lib/xmlgraphics-commons-1.5.jar])

注意前面的报错信息，把lib下的win32-x86-64拷到项目中的bin目录下就可以了