百度翻译开放接口JAVA实现

百度翻译的开放接口文档在这里：http://api.fanyi.baidu.com/api/trans/product/apidoc

至于申请key啥的就不说了，直接进实现。

我是用HC4.5.1做的，在部分代码处理上面，会跟3 4 的版本有点不一致。

	public static void main(String[] args) {
	    String query = "搞个乜";

        get(query);
        post(query);
    }

	private static void get(String query){
		CloseableHttpClient hc = HttpClientBuilder.create().build();
		HttpGet httpGet = new HttpGet();
		CloseableHttpResponse response;
		try {
			String q = URLEncoder.encode(query, "UTF-8");
			String from = Lang.AUTO;
			String to = Lang.EN;
			String salt = RandomStringUtils.randomNumeric(8);
			//appid+q+salt+密钥
			String sign = EncryptUtils.md5crypt(TranslateApi.APPID + query + salt + TranslateApi.KEY);
			httpGet = new HttpGet(TranslateApi.URL
					+ "?q=" + q
					+ "&from=" + from
					+ "&to=" + to
					+ "&appid=" + TranslateApi.APPID
					+ "&salt=" + salt
					+ "&sign=" + sign);
			response = hc.execute(httpGet);
			System.out.println(EntityUtils.toString(response.getEntity()));
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			httpGet.releaseConnection();
		}

	}

	private static void post(String query) {

		CloseableHttpClient hc = HttpClientBuilder.create().build();
		HttpPost httpPost = new HttpPost(TranslateApi.URL);

		CloseableHttpResponse response;
		try {
			String salt = RandomStringUtils.randomNumeric(8);
			//appid+q+salt+密钥
			String sign = EncryptUtils.md5crypt(TranslateApi.APPID + query + salt + TranslateApi.KEY);

			List<NameValuePair> params = new ArrayList<NameValuePair>();
	        params.add(new BasicNameValuePair("q", query));
			params.add(new BasicNameValuePair("from", Lang.AUTO));
			params.add(new BasicNameValuePair("to", Lang.EN));
			params.add(new BasicNameValuePair("appid", TranslateApi.APPID));
			params.add(new BasicNameValuePair("salt",salt));
			params.add(new BasicNameValuePair("sign", sign));

			httpPost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
			response = hc.execute(httpPost);
			System.out.println(EntityUtils.toString(response.getEntity()));
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			httpPost.releaseConnection();
		}
    }

整个过程其实是比较简单的，稍微要注意点的，就是POST方法的使用上，由于是使用POST，所以q参数实质上传递的就是原值，而不是urlencode后的值。如果传递的是编码之后的值，那么恭喜你了，你想要的结果根本就不是那么一回事。另外一个关键点是post参数在加入到POST请求的时候，必须要传递UTF-8格式参数过去，否则的话，会报sign错误的信息。