SpringBoot+OCR 实现图片文字识别

<dependencies>
    <!-- 百度人工智能依赖 -->
    <!-- https://mvnrepository.com/artifact/com.baidu.aip/java-sdk -->
    <dependency>
        <groupId>com.baidu.aip</groupId>
        <artifactId>java-sdk</artifactId>
        <version>4.11.3</version>
    </dependency>
    <!-- 对象转换成json -->
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.9.8</version>
    </dependency>
</dependencies>

public class JsonChange {

    /**
     * json字符串转换为map
     */
    public static <T> Map<String, Object> json2map(String jsonString) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        return mapper.readValue(jsonString, Map.class);
    }

}

@RestController
public class OcrController {

    @PostMapping(value = "/ocr")
    public Map<Object, Object> ocr(MultipartFile file) throws Exception {
        AipOcr client = new AipOcr("AppID", "API Key", "Secret Key");
        // 传入可选参数调用接口
        HashMap<String, String> options = new HashMap<String, String>(4);
        options.put("language_type", "CHN_ENG");
        options.put("detect_direction", "true");
        options.put("detect_language", "true");
        options.put("probability", "true");

        // 参数为二进制数组
        byte[] buf = file.getBytes();
        JSONObject res = client.basicGeneral(buf, options);

        Map map = JsonChange.json2map(res.toString());
        return map;
    }
    
}

//  提取并打印出识别的文字
List list = (List) map.get("words_result");
int len = ((List) map.get("words_result")).size();
for(int i=0; i<len; i++) {
    str = str + ((Map) list.get(i)).get("words") + "\n";
}