This example uses General Table OCR as an example to describe how to use Java to call an API. To call other APIs, replace https://{endpoint}/v2/{project_id}/ocr/general-table in code with the actual one.

package OCRDemo;
import com.huawei.ais.sdk.util.HttpClientUtils;

import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;

import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.entity.StringEntity;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import com.alibaba.fastjson.JSONObject;

import org.apache.http.entity.ContentType;
import org.apache.http.message.BasicHeader;

/**
* This demo is used only for tests. You are advised to use the SDK.
* Before using this demo, configure the dependent JAR package. Obtain this package by downloading the SDK.
 */

public class OCRDemo {
	public static void main(String[] args) throws URISyntaxException, UnsupportedOperationException, IOException{
		TokenDemo();
	}
	
	public static void TokenDemo() throws URISyntaxException, UnsupportedOperationException, IOException {

		String url = "https://{endpoint}/v2/{project_id}/ocr/general-table";
		String token = "Actual token value obtained by the user";
		String imgPath = "./data/general-table-demo.png"; //File path or URL of the image to be recognized.
		
        JSONObject params = new JSONObject();
		try {
			if (imgPath.indexOf("http://") != -1 || imgPath.indexOf("https://") != -1) {
				params.put("url", imgPath);
			} else {
				byte[] fileData = FileUtils.readFileToByteArray(new File(imgPath));
				String fileBase64Str = Base64.encodeBase64String(fileData);
				params.put("image", fileBase64Str);
			}

			Header[] headers = new Header[]{new BasicHeader("X-Auth-Token", token), new BasicHeader("Content-Type", ContentType.APPLICATION_JSON.toString())};
			StringEntity stringEntity = new StringEntity(params.toJSONString(), "utf-8");
			HttpResponse response = HttpClientUtils.post(url, headers, stringEntity);
			String content = IOUtils.toString(response.getEntity().getContent(), "utf-8");
			System.out.println(content); 
		}
		catch (Exception e) {
			e.printStackTrace();
		}
	}
}