中英翻译（基于百度翻译）

先来看效果图

只做了简单的在线翻译，语音翻译和图片翻译都要钱，哈哈

市面上有名气的翻译公司就是有道和百度了，有道尝试了一下，分为API和SDK两种，但是demo下载下来跑不了

百度的就是API，也很简单，就是通过百度的协议去请求他们的服务器，得到翻译后的值，每个月有200万的免费，够用了

百度文档地址http://api.fanyi.baidu.com/api/trans/product/apidoc#joinFile

步骤：

java版demo下载地址https://fanyiapp.cdn.bcebos.com/api/demo/java.zip

下面是核心代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context=".MainActivity"><EditTextandroid:id="@+id/inputChinese"android:layout_width="match_parent"android:layout_height="wrap_content"android:hint="请输入要翻译的中文"android:singleLine="true" /><EditTextandroid:id="@+id/inputEnglish"android:layout_width="match_parent"android:layout_height="wrap_content"android:hint="请输入要翻译的英文"android:singleLine="true" /><TextViewandroid:id="@+id/translate"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="right"android:layout_margin="10dp"android:padding="10dp"android:text="翻译"android:textSize="20sp" /><TextViewandroid:id="@+id/outputEnglish"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="5dp"tools:text="得到的英文" /><TextViewandroid:id="@+id/outputChinese"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_margin="5dp"tools:text="得到的中文" /></LinearLayout>

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;public class MainActivity extends AppCompatActivity {private static final String APP_ID = "20190603000304432";private static final String SECURITY_KEY = "gZTcFc0TyR6tZS5FfmyA";private EditText inputChinese;private EditText inputEnglish;private TextView outputEnglish;private TextView outputChinese;private TextView translate;private TransApi api;private static final int CHINESE = 1;private static final int ENGLISH = 2;private static final String TO_ENGLISH = "en";private static final String TO_CHINESE = "zh";private Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);String str = String.valueOf(msg.obj);String value = parserJson(str);switch (msg.what) {case CHINESE:outputChinese.setText(value);break;case ENGLISH:outputEnglish.setText(value);break;}}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();api = new TransApi(APP_ID, SECURITY_KEY);translate.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {translate(inputChinese.getText().toString(), TO_ENGLISH);translate(inputEnglish.getText().toString(), TO_CHINESE);}});}private void initView() {inputChinese = findViewById(R.id.inputChinese);inputEnglish = findViewById(R.id.inputEnglish);outputEnglish = findViewById(R.id.outputEnglish);outputChinese = findViewById(R.id.outputChinese);translate = findViewById(R.id.translate);}private void translate(final String chinese, final String toLanguage) {new Thread(new Runnable() {@Overridepublic void run() {String transResult = api.getTransResult(chinese, "auto", toLanguage);Message message = new Message();switch (toLanguage) {case TO_CHINESE:message.what = CHINESE;break;case TO_ENGLISH:message.what = ENGLISH;break;}message.obj = transResult;handler.sendMessage(message);}}).start();}private String parserJson(String str) {try {JSONObject jsonObject = new JSONObject(str);JSONArray trans_result = jsonObject.getJSONArray("trans_result");JSONObject result = trans_result.getJSONObject(0);String dst = result.getString("dst");return dst;} catch (JSONException e) {e.printStackTrace();}return "";}
}

import java.io.BufferedReader;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Map;import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;class HttpGet {protected static final int SOCKET_TIMEOUT = 10000; // 10Sprotected static final String GET = "GET";public static String get(String host, Map<String, String> params) {try {// 设置SSLContextSSLContext sslcontext = SSLContext.getInstance("TLS");sslcontext.init(null, new TrustManager[] { myX509TrustManager }, null);String sendUrl = getUrlWithQueryString(host, params);// System.out.println("URL:" + sendUrl);
URL uri = new URL(sendUrl); // 创建URL对象HttpURLConnection conn = (HttpURLConnection) uri.openConnection();if (conn instanceof HttpsURLConnection) {((HttpsURLConnection) conn).setSSLSocketFactory(sslcontext.getSocketFactory());}conn.setConnectTimeout(SOCKET_TIMEOUT); // 设置相应超时
            conn.setRequestMethod(GET);int statusCode = conn.getResponseCode();if (statusCode != HttpURLConnection.HTTP_OK) {System.out.println("Http错误码：" + statusCode);}// 读取服务器的数据InputStream is = conn.getInputStream();BufferedReader br = new BufferedReader(new InputStreamReader(is));StringBuilder builder = new StringBuilder();String line = null;while ((line = br.readLine()) != null) {builder.append(line);}String text = builder.toString();close(br); // 关闭数据流close(is); // 关闭数据流conn.disconnect(); // 断开连接return text;} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} catch (KeyManagementException e) {e.printStackTrace();} catch (NoSuchAlgorithmException e) {e.printStackTrace();}return null;}public static String getUrlWithQueryString(String url, Map<String, String> params) {if (params == null) {return url;}StringBuilder builder = new StringBuilder(url);if (url.contains("?")) {builder.append("&");} else {builder.append("?");}int i = 0;for (String key : params.keySet()) {String value = params.get(key);if (value == null) { // 过滤空的keycontinue;}if (i != 0) {builder.append('&');}builder.append(key);builder.append('=');builder.append(encode(value));i++;}return builder.toString();}protected static void close(Closeable closeable) {if (closeable != null) {try {closeable.close();} catch (IOException e) {e.printStackTrace();}}}/*** 对输入的字符串进行URL编码, 即转换为%20这种形式* * @param input 原文* @return URL编码. 如果编码失败, 则返回原文*/public static String encode(String input) {if (input == null) {return "";}try {return URLEncoder.encode(input, "utf-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}return input;}private static TrustManager myX509TrustManager = new X509TrustManager() {@Overridepublic X509Certificate[] getAcceptedIssuers() {return null;}@Overridepublic void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {}@Overridepublic void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {}};}

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;/*** MD5编码相关的类** @author wangjingtao*/
public class MD5 {// 首先初始化一个字符数组，用来存放每个16进制字符private static final char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd','e', 'f'};/*** 获得一个字符串的MD5值** @param input 输入的字符串* @return 输入字符串的MD5值*/public static String md5(String input) {if (input == null)return null;try {// 拿到一个MD5转换器（如果想要SHA1参数换成”SHA1”）MessageDigest messageDigest = MessageDigest.getInstance("MD5");// 输入的字符串转换成字节数组byte[] inputByteArray = input.getBytes("utf-8");// inputByteArray是输入字符串转换得到的字节数组
            messageDigest.update(inputByteArray);// 转换并返回结果，也是字节数组，包含16个元素byte[] resultByteArray = messageDigest.digest();// 字符数组转换成字符串返回return byteArrayToHex(resultByteArray);} catch (NoSuchAlgorithmException e) {return null;} catch (UnsupportedEncodingException e) {e.printStackTrace();}return null;}/*** 获取文件的MD5值** @param file* @return*/public static String md5(File file) {try {if (!file.isFile()) {System.err.println("文件" + file.getAbsolutePath() + "不存在或者不是文件");return null;}FileInputStream in = new FileInputStream(file);String result = md5(in);in.close();return result;} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return null;}public static String md5(InputStream in) {try {MessageDigest messagedigest = MessageDigest.getInstance("MD5");byte[] buffer = new byte[1024];int read = 0;while ((read = in.read(buffer)) != -1) {messagedigest.update(buffer, 0, read);}in.close();String result = byteArrayToHex(messagedigest.digest());return result;} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return null;}private static String byteArrayToHex(byte[] byteArray) {// new一个字符数组，这个就是用来组成结果字符串的（解释一下：一个byte是八位二进制，也就是2位十六进制字符（2的8次方等于16的2次方））char[] resultCharArray = new char[byteArray.length * 2];// 遍历字节数组，通过位运算（位运算效率高），转换成字符放到字符数组中去int index = 0;for (byte b : byteArray) {resultCharArray[index++] = hexDigits[b >>> 4 & 0xf];resultCharArray[index++] = hexDigits[b & 0xf];}// 字符数组组合成字符串返回return new String(resultCharArray);}}

import java.util.HashMap;
import java.util.Map;public class TransApi {private static final String TRANS_API_HOST = "http://api.fanyi.baidu.com/api/trans/vip/translate";private String appid;private String securityKey;public TransApi(String appid, String securityKey) {this.appid = appid;this.securityKey = securityKey;}public String getTransResult(String query, String from, String to) {Map<String, String> params = buildParams(query, from, to);return HttpGet.get(TRANS_API_HOST, params);}private Map<String, String> buildParams(String query, String from, String to) {Map<String, String> params = new HashMap<String, String>();params.put("q", query);params.put("from", from);params.put("to", to);params.put("appid", appid);// 随机数String salt = String.valueOf(System.currentTimeMillis());params.put("salt", salt);// 签名String src = appid + query + salt + securityKey; // 加密前的原文params.put("sign", MD5.md5(src));return params;}}