神器 | 教你使用 JAVA 开发 类似【百度翻译】功能

@SpringBootApplication
@ComponentScan(basePackages={"com.xdl"})//添加的注解
public class MainServer extends SpringBootServletInitializer {
    public static void main(String[] args) {
        SpringApplication.run(MainServer.class, args);
    }
}

@Controller
public class TransController {
    private static final String APP_ID = "你自己百度翻译开发者的ID";
    private static final String SECURITY_KEY = "秘钥";
    @RequestMapping(value = "/main", method = RequestMethod.GET)
    public String login() {
        return "index";
    }
    @RequestMapping(value = "/trans", method = RequestMethod.POST)
    public @ResponseBody String trans(Model model, String text) throws Exception {
        TransApi api = new TransApi(APP_ID, SECURITY_KEY);
        String query = text;
        String msg = api.getTransResult(query, "auto", "en");
        model.addAttribute("dst", msg);
        return msg;
    }
    @RequestMapping(value = "/trans2", method = RequestMethod.POST)
    public @ResponseBody String trans2(Model model, String text2) throws Exception {
        TransApi api = new TransApi(APP_ID, SECURITY_KEY);
        String query = text2;
        String msg = api.getTransResult(query, "en", "auto");
        model.addAttribute("dst", msg);
        return msg;
    }
}

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) throws UnsupportedEncodingException {
        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) throws UnsupportedEncodingException {
        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;
    }
}

class HttpGet {
    protected static final int SOCKET_TIMEOUT = 10000; // 10S
    protected static final String GET = "GET";
    public static String get(String host, Map<String, String> params) {
        try {
            // 设置SSLContext
            SSLContext 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key
                continue;
            }
            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() {
        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return null;
        }
        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }
        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }
    };
}