package cn.qlq.utils.baidutranslate;

public class Main {

    // 在平台申请的APP_ID 详见
    // http://api.fanyi.baidu.com/api/trans/product/desktop?req=developer
    private static final String APP_ID = "";
    private static final String SECURITY_KEY = "";

    public static void main(String[] args) {
        TransApi api = new TransApi(APP_ID, SECURITY_KEY);

        String query = "you are my son!";
        System.out.println(api.getTransResult(query, "auto", "auto"));
    }

}

package cn.qlq.utils.baidutranslate;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;

import com.alibaba.fastjson.JSONObject;

public class TransApi {

    private static final String TRANS_API_HOST = "http://api.fanyi.baidu.com/api/trans/vip/translate";

    // 在平台申请的APP_ID 详见
    // http://api.fanyi.baidu.com/api/trans/product/desktop?req=developer
    private static final String APP_ID = "yourId";
    private static final String SECURITY_KEY = "yourKey";

    public static String translate(String keyWords) {
        return translate(keyWords, "auto", "auto");
    }

    public static String translate(String keyWords, String from, String to) {
        String transResult = getTransResult(keyWords, from, to);
        if (StringUtils.isBlank(transResult)) {
            return "";
        }

        JSONObject parseObject = JSONObject.parseObject(transResult);
        if (parseObject != null && parseObject.containsKey("trans_result") && parseObject.get("trans_result") != null) {
            return parseObject.get("trans_result").toString();
        }

        return "";
    }

    private static String getTransResult(String query, String from, String to) {
        Map<String, String> params = buildParams(query, from, to);
        return HttpGet.get(TRANS_API_HOST, params);
    }

    private static 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", APP_ID);

        // 随机数
        String salt = String.valueOf(System.currentTimeMillis());
        params.put("salt", salt);

        // 签名
        String src = APP_ID + query + salt + SECURITY_KEY; // 加密前的原文
        params.put("sign", MD5.md5(src));

        return params;
    }

}

    /**
     * 处理文本消息
     * 
     * @param message
     * @return
     */
    private static AbstractResponseMessage handleTextMessage(Map<String, Object> message) {
        TextMessage textMessage = BeanUtils.map2Bean(message, TextMessage.class, true);

        String content = textMessage.getContent();
        // 可以根据文本消息去查库或者进行其他操作
        if (StringUtils.isNotBlank(content)) {
            System.out.println("您接收到的文本消息内容为: " + content);
        }

        // 设置回传的消息内容
        TextResponseMessage responseMessage = new TextResponseMessage();
        responseMessage.setContent("服务器已接收到您的消息，内容为: " + content);
        responseMessage.setCreateTime(new Date().getTime());
        responseMessage.setFromUserName(textMessage.getToUserName());
        responseMessage.setToUserName(textMessage.getFromUserName());
        responseMessage.setMsgType(MESSAGE_TEXT);

        // 如果文字消息以翻译开头调用百度API翻译
        if (StringUtils.startsWith(content, "翻译")) {
            String translateResult = TransApi.translate(content.replaceAll("^翻译", ""));
            translateResult = StringUtils.defaultIfBlank(translateResult, "未正确翻译");
            responseMessage.setContent(translateResult);
        }

        return responseMessage;
    }