1. 介绍
随着人工智能技术的发展和应用场景的不断拓展,百度AI平台提供了多种人工智能API接口,为开发者提供了丰富的工具。本文主要介绍如何使用Java语言对接百度AI接口的最佳实践,希望能够帮助广大开发者快速上手。
2. 百度AI平台的API接口
目前,百度AI平台提供了多个API接口,其中最常见的包括:
2.1 人脸识别API
该API接口提供了人脸检测、人脸对比、人脸搜索、人脸属性分析等多种功能。
// 人脸检测
String url = "https://aip.baidubce.com/rest/2.0/face/v3/detect";
String accessToken = "your_access_token";
String img = "img_data";
HttpPost httpPost = new HttpPost(url);
httpPost.addHeader("Content-Type", "application/json");
StringEntity requestParam = new StringEntity("{\"image\":\"" + img + "\","
+ "\"image_type\":\"BASE64\","
+ "\"face_field\":\"age,gender,beauty,expression\","
+ "\"max_face_num\":\"1\"}");
httpPost.setEntity(requestParam);
HttpResponse httpResponse = httpClient.execute(httpPost);
2.2 自然语言处理API
该API接口提供了分词、词性标注、命名实体识别、情感分析、文本相似度等多种功能。
// 分词
String url = "https://aip.baidubce.com/rpc/2.0/nlp/v1/lexer";
String accessToken = "your_access_token";
String text = "我爱北京天安门";
HttpPost httpPost = new HttpPost(url);
httpPost.addHeader("Content-Type", "application/json");
httpPost.setHeader("Content-Encoding", "UTF-8");
httpPost.setHeader("Authorization", "Bearer " + accessToken);
StringEntity requestParam = new StringEntity("{\"text\":\"" + text + "\"}");
httpPost.setEntity(requestParam);
HttpResponse httpResponse = httpClient.execute(httpPost);
3. Java语言下对接百度AI接口的最佳实践
3.1 获取Access Token
在使用百度AI平台的API接口前,需要先获取Access Token,具体方法如下:
public static String getAuth() {
// 官网获取的 API Key
String clientId = "your_client_id";
// 官网获取的 Secret Key
String clientSecret = "your_client_secret";
return getAuth(clientId, clientSecret);
}
public static String getAuth(String ak, String sk) {
// 获取token地址
String authHost = "https://aip.baidubce.com/oauth/2.0/token?";
String getAccessTokenUrl = authHost
// 1. grant_type为固定参数
+ "grant_type=client_credentials"
// 2. 官网获取的 API Key
+ "&client_id=" + ak
// 3. 官网获取的 Secret Key
+ "&client_secret=" + sk;
HttpClient httpClient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet(getAccessTokenUrl);
try {
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
JSONObject accessTokenJson = new JSONObject(EntityUtils.toString(httpEntity, "UTF-8"));
return accessTokenJson.getString("access_token");
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
3.2 发送请求
通过HttpClient发送HTTP请求,传递请求参数,获取返回结果。以下是一个发送请求的例子:
String url = "https://aip.baidubce.com/rpc/2.0/nlp/v1/lexer";
String accessToken = "your_access_token";
String text = "我爱北京天安门";
HttpPost httpPost = new HttpPost(url);
httpPost.addHeader("Content-Type", "application/json");
httpPost.setHeader("Content-Encoding", "UTF-8");
httpPost.setHeader("Authorization", "Bearer " + accessToken);
StringEntity requestParam = new StringEntity("{\"text\":\"" + text + "\"}");
httpPost.setEntity(requestParam);
HttpResponse httpResponse = httpClient.execute(httpPost);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
String responseStr = EntityUtils.toString(httpResponse.getEntity());
// 处理返回结果
System.out.println(responseStr);
}
4. 接口调用注意事项
4.1 Access Token有效期
Access Token的有效期为30天,过期后需要重新获取。为防止Access Token在调用过程中过期,可在发送请求前对Access Token进行判断。
public static String getAccessToken() {
String accessToken = "";
// 全局变量accessToken为空或已过期,需要重新获取
if ("".equals(accessToken) || System.currentTimeMillis() - expireTime > 1000 * 60 * 29) {
accessToken = getAuth();
expireTime = System.currentTimeMillis();
}
return accessToken;
}
4.2 请求参数
每个接口需要传递的请求参数不同,具体参数可参考百度AI平台接口文档,建议使用Json格式传递参数。
4.3 返回值处理
百度AI平台返回的结果为Json格式,需根据文档中指定属性进行结果解析。
5. 总结
Java语言下对接百度AI接口需要先获取Access Token,再通过HttpClient发送HTTP请求,在对返回结果进行处理。
应用场景广泛的百度AI平台的API接口,为广大开发者提供了丰富的工具,我们可以根据自身需求,调用相应的API,使用百度AI平台的API接口,实现自己所需的人工智能应用,提高工作效率和用户体验。