java程序员自己的图片转文字OCR识图工具

图片文字识别，只支持在windows上运行，语言自动识别，调用的是百度OCR-API，需要提供百度智能云管理后台的应用的API Key和Secret Key。
打包成jar文件放桌面可以自己用也可以给亲人朋友用。

只需三个文件，即可自己开发一个OCR工具软件：

App.java

package translate.image;import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileSystemView;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;/*** 图片文字识别，只支持在windows上运行，语言自动识别，调用的是百度OCR-API，需要提供百度智能云管理后台的应用的API Key和Secret Key** @author tang*/
public class App {public static void main(String[] args) throws Exception {UIManager.setLookAndFeel(com.sun.java.swing.plaf.windows.WindowsLookAndFeel.class.getName());UIManager.put("ScrollBarUI", "com.sun.java.swing.plaf.windows.WindowsScrollBarUI");// 设置滚动条样式为window风格的滚动条样式// 设置文件夹在swing中所显示的图标UIManager.put("FileView.directoryIcon", FileSystemView.getFileSystemView().getSystemIcon(new File(System.getProperty("user.dir"))));String oldApiKey = "";String oldSecretKey = "";final File keyFile = new File(System.getProperty("user.dir") + "/百度OCR应用密钥.txt");if (keyFile.exists()) {try {List<String> keyTextList = Files.readAllLines(keyFile.toPath());if (keyTextList != null && keyTextList.size() >= 2) {oldApiKey = keyTextList.get(0);oldSecretKey = keyTextList.get(1);}} catch (Exception e) {e.printStackTrace();}}final JFrame jFrame = new JFrame();JPanel contentPane = new JPanel();jFrame.setContentPane(contentPane);contentPane.setBorder(new EmptyBorder(10, 10, 10, 10));contentPane.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 20));JPanel jp1 = new JPanel();jp1.setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));jp1.setBorder(new EmptyBorder(0, 0, 0, 0));jp1.setPreferredSize(new Dimension(400, 30));JLabel apiKeyLabel = new JLabel("   API Key : ");jp1.add(apiKeyLabel);final JTextField apiKeyTextField = new JTextField("", 40);apiKeyTextField.setText(oldApiKey);jp1.add(apiKeyTextField);contentPane.add(jp1);JPanel jp2 = new JPanel();jp2.setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));jp2.setBorder(new EmptyBorder(0, 0, 0, 0));jp2.setPreferredSize(new Dimension(400, 30));JLabel secretKeyLabel = new JLabel("Secret Key : ");jp2.add(secretKeyLabel);final JTextField secretKeyTextField = new JTextField("", 40);secretKeyTextField.setText(oldSecretKey);jp2.add(secretKeyTextField);contentPane.add(jp2);JPanel jp3 = new JPanel();jp3.setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));jp3.setBorder(new EmptyBorder(0, 0, 0, 0));jp2.setPreferredSize(new Dimension(400, 30));JLabel imageLabel = new JLabel(" Image : ");jp3.add(imageLabel);final JTextField imageTextField = new JTextField("", 40);jp3.add(imageTextField);JButton selFileBtn = new JButton("...");jp3.add(selFileBtn);final JFileChooser chooser = new JFileChooser();chooser.setCurrentDirectory(new File(System.getProperty("user.home") + "/Desktop"));chooser.setFileFilter(new FileFilter() {public boolean accept(File f) {if (f.isDirectory()) {return true;}if (f.getName().endsWith(".png") || f.getName().endsWith(".jpg") || f.getName().endsWith(".jpeg") || f.getName().endsWith(".bmp")) {return true;}return false;}public String getDescription() {return "png/jpg/bmp";}});selFileBtn.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {int i = chooser.showOpenDialog(jFrame);if (JFileChooser.APPROVE_OPTION == i) {File selectedFile = chooser.getSelectedFile();if (selectedFile != null && selectedFile.getAbsolutePath() != null) {imageTextField.setText(selectedFile.getAbsolutePath());return;}}imageTextField.setText("");}});contentPane.add(jp3);JPanel jp4 = new JPanel();jp4.setLayout(new FlowLayout(FlowLayout.RIGHT, 0, 0));jp4.setBorder(new EmptyBorder(0, 0, 0, 0));jp4.setPreferredSize(new Dimension(400, 30));JButton saveKeyBtn = new JButton("保存密钥");jp4.add(saveKeyBtn);contentPane.add(jp4);JButton okBtn = new JButton("识别文字");jp4.add(okBtn);JPanel jp5 = new JPanel();jp5.setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));jp5.setBorder(new EmptyBorder(0, 0, 0, 0));jp5.setPreferredSize(new Dimension(400, 500));final JTextArea textArea = new JTextArea(30, 40);textArea.setSize(new Dimension(380, 500));textArea.setText("1，调用的是百度OCR-API，需要提供百度智能云管理后台的应用的API Key和Secret Key。\r\n" +"\t1.1，进入百度智能云服务列表：https://console.bce.baidu.com/ai/#/ai/ocr/overview/index 。\r\n" +"\t1.2，点击'通用场景OCR'，然后找到'通用文字识别（高精度版）'后点击开通。\r\n" +"\t1.3，进入创建应用页面：https://console.bce.baidu.com/ai/#/ai/ocr/app/create。\r\n" +"\t1.4，填写应用名称，应用归属选择'个人'，随便填写应用描述，然后点击'立即创建'。\r\n" +"\t1.5，进入应用列表页面：https://console.bce.baidu.com/ai/#/ai/ocr/app/list。\r\n" +"\t1.6，复制出API Key和Secret Key。\r\n" +"\t1.7，该接口每天只能免费调用500次，超出部分百度要收费。\r\n" +"2，语言可以自动识别。\r\n" +"3，只支持png/jpg/bmp格式图片。");textArea.setWrapStyleWord(true);textArea.setAutoscrolls(true);textArea.setLineWrap(true);JScrollPane jsp = new JScrollPane(textArea);jsp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);jp5.add(jsp);contentPane.add(jp5);saveKeyBtn.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (BaiduCloudApiUtil.appApiKey.trim().isEmpty() || BaiduCloudApiUtil.appSecretKey.trim().isEmpty()) {textArea.setText("请先调用接口，成功后才能保存密钥！");return;}List<String> list = new ArrayList<>(2);list.add(BaiduCloudApiUtil.appApiKey);list.add(BaiduCloudApiUtil.appSecretKey);try {Files.write(keyFile.toPath(), list, Charset.forName("UTF-8"), StandardOpenOption.CREATE);textArea.setText("保存密钥成功！");} catch (IOException ex) {ex.printStackTrace();}}});okBtn.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (apiKeyTextField.getText().trim().isEmpty()) {textArea.setText("请输入API Key！");return;}if (secretKeyTextField.getText().trim().isEmpty()) {textArea.setText("请输入Secret Key！");return;}BaiduCloudApiUtil.appApiKey = apiKeyTextField.getText().trim();BaiduCloudApiUtil.appSecretKey = secretKeyTextField.getText().trim();if (!"".equals(imageTextField.getText().trim())) {try {byte[] bytes = Files.readAllBytes(chooser.getSelectedFile().toPath());Map<String, Object> map = BaiduCloudApiUtil.queryOcrResult(bytes);if (map != null && !map.isEmpty()) {Boolean success = (Boolean) map.get("success");if (success) {String data = (String) map.get("data");if (data != null && !data.trim().isEmpty()) {textArea.setText(data);} else {textArea.setText("");}} else {String message = (String) map.get("message");textArea.setText(message);}return;}} catch (Exception ex) {ex.printStackTrace();}textArea.setText("转化文字失败！");} else {textArea.setText("没有选择文件！");}}});jFrame.setSize(500, 800);jFrame.setLocationRelativeTo(null);jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);jFrame.setVisible(true);}
}

BaiduCloudApiUtil.java

package translate.image;import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import java.lang.reflect.Method;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.file.Files;
import java.util.HashMap;
import java.util.Map;public class BaiduCloudApiUtil {static String appApiKey = "";static String appSecretKey = "";private static volatile String accessToken;private static volatile long accessTokenTime;// 获取凭证时的时间，单位：毫秒数，System.currentTimeMillisprivate static volatile int expireTime;// 凭证有效时间，单位：秒private static void clearToken() {accessToken = "";expireTime = 0;accessTokenTime = 0;}public static String getAccessToken() {if (!(accessToken == null || accessToken.trim().isEmpty()) && accessTokenTime > 0 && expireTime > 0) {long extime = accessTokenTime + (expireTime * 1000);long nowTime = System.currentTimeMillis();if (extime - nowTime > 1000) {// 仍然有效return accessToken;}}String authHost = "https://aip.baidubce.com/oauth/2.0/token?";String getAccessTokenUrl = authHost + "grant_type=client_credentials" + "&client_id=" + appApiKey + "&client_secret=" + appSecretKey;try {URL realUrl = new URL(getAccessTokenUrl);HttpURLConnection connection = (HttpURLConnection) realUrl.openConnection();connection.setRequestMethod("GET");connection.connect();try (BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {String result = "";String line;while ((line = in.readLine()) != null) {result += line;}JSONObject jsonObject = (JSONObject) JSONObject.parse(result);expireTime = jsonObject.getInteger("expires_in");accessToken = jsonObject.getString("access_token");accessTokenTime = System.currentTimeMillis();} catch (Throwable e) {e.printStackTrace();clearToken();}} catch (Throwable e) {e.printStackTrace();clearToken();}return accessToken;}public static Map<String, Object> parse(JSONObject jsonObject) {HashMap<String, Object> map = new HashMap<>();map.put("success", false);if (jsonObject == null) {map.put("message", "空的调用结果");return map;}try {Integer words_result_num = jsonObject.getInteger("words_result_num");if (words_result_num == null || words_result_num.intValue() <= 0) {map.put("message", "未解析到结果");return map;}JSONArray words_result = jsonObject.getJSONArray("words_result");StringBuffer sb = new StringBuffer();for (Object obj : words_result) {JSONObject jo = (JSONObject) obj;String words = jo.getString("words");sb.append(words + "\r\n");}System.out.println(sb);map.put("data", sb.toString());map.put("success", true);} catch (Exception e) {map.put("message", "无法解析调用结果");}return map;}public static JSONObject ocr(String httpUrl, String httpArg) {try {URL url = new URL(httpUrl);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setRequestMethod("POST");connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");connection.setRequestProperty("apikey", appApiKey);connection.setDoOutput(true);connection.getOutputStream().write(httpArg.getBytes("UTF-8"));connection.connect();try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"))) {StringBuffer sbf = new StringBuffer();String strRead = null;while ((strRead = reader.readLine()) != null) {sbf.append(strRead);sbf.append("\r\n");}String result = sbf.toString();JSONObject jsonObject = (JSONObject) JSONObject.parse(result);return jsonObject;} catch (Throwable e) {e.printStackTrace();}} catch (Throwable e) {e.printStackTrace();}return null;}public static String encodeBase64(byte[] input) throws Exception {Class<?> clazz = Class.forName("com.sun.org.apache.xerces.internal.impl.dv.util.Base64");Method mainMethod = clazz.getMethod("encode", byte[].class);mainMethod.setAccessible(true);Object retObj = mainMethod.invoke(null, new Object[]{input});return (String) retObj;}public static Map<String, Object> queryOcrResult(byte[] fileBytes) {try {String imageBase = encodeBase64(fileBytes);imageBase = URLEncoder.encode(imageBase, "UTF-8");String httpUrl = "https://aip.baidubce.com/rest/2.0/ocr/v1/accurate_basic?access_token=" + getAccessToken();String httpArg = "language_type=auto_detect&image=" + imageBase;JSONObject jsonObject = ocr(httpUrl, httpArg);if (jsonObject == null) {HashMap<String, Object> map = new HashMap<>();map.put("success", false);map.put("message", "系统错误，请稍后重试");return map;}Map<String, Object> map = parse(jsonObject);return map;} catch (Exception e) {HashMap<String, Object> map = new HashMap<>();map.put("success", false);map.put("message", "系统错误，请稍后重试");return map;}}public static void main(String[] args) throws Exception {File file = new File("C:\\Users\\tang8\\Desktop\\2022-07-21_070822.png");byte[] data = Files.readAllBytes(file.toPath());Map<String, Object> map = queryOcrResult(data);System.out.println(map.get("data"));}
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>translate.image</groupId><artifactId>TranslateImage</artifactId><version>1.0-SNAPSHOT</version><name>TranslateImage</name><url>http://www.example.com</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target></properties><dependencies><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.29</version></dependency></dependencies><build><pluginManagement><plugins><plugin><artifactId>maven-compiler-plugin</artifactId><version>3.8.0</version></plugin><plugin><artifactId>maven-jar-plugin</artifactId><version>3.0.2</version></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-shade-plugin</artifactId><version>3.1.1</version></plugin></plugins></pluginManagement><plugins><plugin><artifactId>maven-compiler-plugin</artifactId><configuration><source>8</source><target>8</target></configuration></plugin><plugin><artifactId>maven-jar-plugin</artifactId><configuration><archive><manifest><mainClass>translate.image.App</mainClass></manifest></archive></configuration></plugin><plugin><artifactId>maven-shade-plugin</artifactId><executions><execution><phase>package</phase><goals><goal>shade</goal></goals></execution></executions></plugin></plugins></build>
</project>

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