前言
什么是Tess4j库
案例
1、引入依赖
<!-- tess4j -->
<dependency>
<groupId>net.sourceforge.tess4j</groupId>
<artifactId>tess4j</artifactId>
<version>4.5.4</version>
</dependency>
2、yml配置
这里,我特地把训练数据的目录路径配置在yml里,后续可以扩展到配置中心。
server:
port: 8888
# 训练数据文件夹的路径
tess4j:
datapath: D:/tessdata
3、config配置类
package com.example.tesseractocr.config;
import net.sourceforge.tess4j.Tesseract;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @作者: 公众号【Java分享客栈】
* @日期: 2023/10/12 22:58
* @描述:
*/
@Configuration
public class TesseractOcrConfiguration {
@Value("${tess4j.datapath}")
private String dataPath;
@Bean
public Tesseract tesseract() {
Tesseract tesseract = new Tesseract();
// 设置训练数据文件夹路径
tesseract.setDatapath(dataPath);
// 设置为中文简体
tesseract.setLanguage("chi_sim");
return tesseract;
}
}
4、service实现
package com.example.tesseractocr.service;
import lombok.AllArgsConstructor;
import net.sourceforge.tess4j.*;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
@Service
@AllArgsConstructor
public class OcrService {
private final Tesseract tesseract;
/**
* 识别图片中的文字
* @param imageFile 图片文件
* @return 文字信息
*/
public String recognizeText(MultipartFile imageFile) throws TesseractException, IOException {
// 转换
InputStream sbs = new ByteArrayInputStream(imageFile.getBytes());
BufferedImage bufferedImage = ImageIO.read(sbs);
// 对图片进行文字识别
return tesseract.doOCR(bufferedImage);
}
}
5、新增rest接口
package com.example.tesseractocr.controller;
import com.example.tesseractocr.service.OcrService;
import lombok.AllArgsConstructor;
import net.sourceforge.tess4j.TesseractException;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import java.io.IOException;
@RequestMapping("/api")
@RestController
@AllArgsConstructor
public class OcrController {
private final OcrService ocrService;
@PostMapping(value = "/recognize", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public String recognizeImage(@RequestParam("file") MultipartFile file) throws TesseractException, IOException {
// 调用OcrService中的方法进行文字识别
return ocrService.recognizeText(file);
}
}
6、测试效果
相关地址
总结
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