java调用百度接口识别图片文字，最全最完整方法

以下是一个完整的Java示，演示如何使用Apache HttpClient库来调用百度OCR接口识别图片文字：

import org.apache.commons.codec.binary.Base64;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

public class BaiduOCR {
    public static void main(String[] args) throws IOException {
        // 设置API Key和Secret Key
        String apiKey = "your_api_key";
        String secretKey = "your_secret_key";

        // 获取访问令牌
        String accessToken = getAccessToken(apiKey, secretKey);

        // 图片路径
        String imagePath = "path_to_your_image";

        // 将图片转为Base64编码
        String imageBase64 = getImageBase64(imagePath);

        // 调用百度OCR接口
        String result = callBaiduOCR(imageBase64, accessToken);

        System.out.println(result);
    }

    // 获取访问令牌
    private static String getAccessToken(String apiKey, String secretKey) throws IOException {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost("https://aip.baidubce.com/oauth/2.0/token");

        List<NameValuePair> params = new ArrayList<>();
        params.add(new BasicNameValuePair("grant_type", "client_credentials"));
        params.add(new BasicNameValuePair("client_id", apiKey));
        params.add(new BasicNameValuePair("client_secret", secretKey));

        httpPost.setEntity(new UrlEncodedFormEntity(params));

        HttpResponse response = httpClient.execute(httpPost);
        HttpEntity entity = response.getEntity();
        String result = EntityUtils.toString(entity, StandardCharsets.UTF_8);

        httpClient.close();

        return result.split("\"")[3];
    }

    // 将图片转为Base64编码
    private static String getImageBase64(String imagePath) throws IOException {
        File file = new File(imagePath);
        FileInputStream inputStream = new FileInputStream(file);
        byte[] buffer = new byte[(int) file.length()];
        inputStream.read(buffer);
        inputStream.close();
        return Base64.encodeBase64String(buffer);
    }

    // 调用百度OCR接口
    private static String callBaiduOCR(String imageBase64, String accessToken) throws IOException {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost("https://aip.baidubce.com/rest/2.0/ocr/v1/general_basic");

        List<NameValuePair> params = new ArrayList<>();
        params.add(new BasicNameValuePair("image", imageBase64));
        params.add(new BasicNameValuePair("access_token", accessToken));

        httpPost.setEntity(new UrlEncodedFormEntity(params));

        HttpResponse response = httpClient.execute(httpPost);
        HttpEntity entity = response.getEntity();
        String result = EntityUtils.toString(entity, StandardCharsets.UTF_8);

        httpClient.close();

        return result;
    }
}

在上述代码中，你需要将`your_api_key`和`your_secret_key`替换为你自己的百度API Key和Secret Key，将`path_to_your_image`替换为你要识别的图片的路径。

请确保已经添加Apache HttpClient和Apache Commons Codec的依赖项到你的项目中。

这个示例代码会将图片转为Base64编码，并调用百度OCR接口来识别图片中的文字。它会返回一个包含识别结果的JSON字符串。

希望这能满足你的需求！如果有任何其他问题，请随时提问。