百度文档：https://ai.baidu.com/ai-doc/OCR/Sk3h7xyad

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import org.json.JSONObject;
import com.alibaba.fastjson.JSON;
import com.baidu.aip.ocr.AipOcr;

public class Sample {
    //设置APPID/AK/SK
    public static final String APP_ID = "...";
    public static final String API_KEY = "...";
    public static final String SECRET_KEY = "...";

    static String fileName="7";

    public static void main(String[] args) throws IOException {
        // 初始化一个AipOcr
        AipOcr client = new AipOcr(APP_ID, API_KEY, SECRET_KEY);

        // 可选：设置网络连接参数
        client.setConnectionTimeoutInMillis(2000);
        client.setSocketTimeoutInMillis(60000);
        
        // 调用接口
        /**
         * 	图片地址
         */
        String path = "E:\\test\\jvm\\"+fileName+".png";
        JSONObject res = client.basicGeneral(path, new HashMap<String, String>());
        Res r=JSON.parseObject(res.toString(),Res.class);
        List<Words> l=r.getWords_result();
        StringBuilder test=new StringBuilder();
        for(Words w:l) {
        	test.append(w.getWords());
        }
        BufferedInputStream bis=new BufferedInputStream(new ByteArrayInputStream(test.toString().getBytes()));
        /**
         * 	将文字输出到本地文件
         */
        BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(new File("E:\\test\\jvm\\"+fileName+".txt")));
        int length;
        byte b[]=new byte[1024];
        while((length=bis.read(b))!=-1) {
        	bos.write(b, 0, length);
        }
        bos.flush();
        bos.close();
        bis.close();
    }
}