Java OCR 图片识别文字

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安装依赖

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<dependency>
    <groupId>io.github.mymonstercat</groupId>
    <artifactId>rapidocr</artifactId>
    <version>0.0.7</version>
</dependency>
<!-- CPU 环境使用 onnx 后端 -->
<dependency>
    <groupId>io.github.mymonstercat</groupId>
    <artifactId>rapidocr-onnx-platform</artifactId>
    <version>0.0.7</version>
</dependency>
<!-- 使用通用 Linux 版本 -->
<dependency>
    <groupId>io.github.mymonstercat</groupId>
    <artifactId>rapidocr-onnx-linux-x86_64</artifactId>
    <version>0.0.6</version>
</dependency>

代码示例

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package com.bozhi.xiaoluo.modules.common.utils;

import com.bozhi.xiaoluo.common.utils.HttpUtils;
import io.github.mymonstercat.Model;
import io.github.mymonstercat.ocr.InferenceEngine;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

@Slf4j
public class PicUtil {

    private static class InferenceEngineHolder {
        private static final InferenceEngine engine = InferenceEngine.getInstance(Model.ONNX_PPOCR_V3);
    }

    //从图片中提取文字 PaddleOCR (Java封装版)：中文识别利器
    public static String queryWordsFromPicLocal(String url) {
        long startTime = System.currentTimeMillis();
        byte[] imageBytes = HttpUtils.downloadImageAsBytes(url);
        if (imageBytes == null) {
            log.error("图片识别:图片下载失败。");
            return "";
        }
        long picDownloadTime = System.currentTimeMillis() - startTime;
        Path tempFile = null;
        // 2. 将字节数组写入临时文件 (推荐使用 .png 后缀)
        try {
            tempFile = Files.createTempFile("ocr_temp_", ".png");
            Files.write(tempFile, imageBytes);
            String result = InferenceEngineHolder.engine.runOcr(tempFile.toAbsolutePath().toString()).getStrRes().trim();
            return result;
        } catch (Throwable e) {
            log.error("图片识别:异常：", e);
        } finally {
            // 6. 清理临时文件
            if (tempFile != null) {
                try {
                    Files.deleteIfExists(tempFile);
                } catch (IOException e) {
                    log.error(e.getMessage());
                }
            }

            if (Env.isDev()) {
                log.info("图片识别:下载图片耗时{}ms 识别耗时{}ms", picDownloadTime, System.currentTimeMillis() - startTime);
            }
        }
        return "";
    }
}

UnsatisfiedLinkError 错误

错误信息：`GLIBCXX_3.4.26’ not found

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[2026-04-01 20:33:39.949] ERROR [AsyncUtils-1] [2039320252728655872] 图片识别异常：java.lang.UnsatisfiedLinkError: /tmp/ocrJava/onnx/libRapidOcr.so: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by /tmp/ocrJava/onnx/libRapidOcr.so)
...
at io.github.mymonstercat.JarFileUtil.copyFileFromJar(JarFileUtil.java:68)
at io.github.mymonstercat.OnnxLinuxX8664LibraryLoader.loadLibrary(OnnxLinuxX8664LibraryLoader.java:14)
at io.github.mymonstercat.ocr.InferenceEngine.loadFileIfNeeded(InferenceEngine.java:78)
at io.github.mymonstercat.ocr.InferenceEngine.runOcr(InferenceEngine.java:55)
at io.github.mymonstercat.ocr.InferenceEngine.runOcr(InferenceEngine.java:50)
at com.bozhi.xiaoluo.modules.common.utils.PicUtil.queryWordsFromPic(PicUtil.java:29)

解决思路

参考 https://www.cnblogs.com/caoyiting/p/16935916.html
参考 https://www.jianshu.com/p/050b2b777b9d
.
问题：软链接指向的是 3.4.25，而我们需要的是 3.4.26
1、下载 3.4.26 对应的包
2、解压包，并安装
3、删除旧的软链接，并创建新的软链接

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strings /usr/lib64/libstdc++.so.6 | grep GLIBCXX
》》》GLIBCXX_3.4.25
》》》GLIBCXX_DEBUG_MESSAGE_LENGTH

sudo yum provides libstdc++.so.6

cd /usr/local/lib64
sudo wget http://www.vuln.cn/wp-content/uploads/2019/08/libstdc.so_.6.0.26.zip
unzip libstdc.so_.6.0.26.zip
cp libstdc++.so.6.0.26 /usr/lib64
cd  /usr/lib64

ls -l | grep libstdc++
》》》lrwxrwxrwx  1 root root        19 11月  8 2024 libstdc++.so.6 -> libstdc++.so.6.0.25
》》》-rwxr-xr-x  1 root root   1661424 11月  8 2024 libstdc++.so.6.0.25
》》》-rwxr-xr-x  1 root root  13172960 4月   1 21:16 libstdc++.so.6.0.26

sudo rm libstdc++.so.6

sudo ln -s libstdc++.so.6.0.26 libstdc++.so.6

strings /usr/lib64/libstdc++.so.6 | grep GLIBCXX
》》》GLIBCXX_3.4.25
》》》GLIBCXX_3.4.26
》》》GLIBCXX_DEBUG_MESSAGE_LENGTH