人工智能图像类API发送请求示例代码方法?

具体原理，参考 数加API使用文档<pre style='background: rgb(246, 246, 246); font: 12px/1.6 "YaHei Consolas Hybrid", Consolas, "Meiryo UI", "Malgun Gothic", "Segoe UI", "Trebuchet MS", Helvetica, monospace, monospace; padding: 10px; outline: 0px; border-radius: 3px; border: 1px solid rgb(221, 221, 221); color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; overflow: auto; margin-top: 0px; margin-right: 0px; margin-bottom: 0px !important; margin-left: 0px; word-spacing: 0px; white-space: pre-wrap; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; font-size-adjust: none; font-stretch: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' prettyprinted?="" linenums="">

1. import java.io.BufferedReader;
2. import java.io.IOException;
3. import java.io.InputStream;
4. import java.io.InputStreamReader;
5. import java.io.PrintWriter;
6. import java.net.HttpURLConnection;
7. import java.net.URL;
8. import java.net.URLConnection;
9. import java.security.MessageDigest;
10. import java.text.SimpleDateFormat;
11. import java.util.Date;
12. import java.util.Locale;
13. import javax.crypto.spec.SecretKeySpec;
15. import sun.misc.BASE64Encoder;
16. import javax.crypto.Mac;
18. public class Sender {
19.     /*
20.      * 计算MD5+BASE64
21.      */
22.     public static String MD5Base64(String s) {
23.         if (s == null)
24.             return null;
25.         String encodeStr = "";
26.         byte[] utfBytes = s.getBytes();
27.         MessageDigest mdTemp;
28.         try {
29.             mdTemp = MessageDigest.getInstance("MD5");
30.             mdTemp.update(utfBytes);
31.             byte[] md5Bytes = mdTemp.digest();
32.             BASE64Encoder b64Encoder = new BASE64Encoder();
33.             encodeStr = b64Encoder.encode(md5Bytes);
34.         } catch (Exception e) {
35.             throw new Error("Failed to generate MD5 : " + e.getMessage());
36.         }
37.         return encodeStr;
38.     }
40.     /*
41.      * 计算 HMAC-SHA1
42.      */
43.     public static String HMACSha1(String data, String key) {
44.         String result;
45.         try {
46.             // System.out.println("data: " + data);
47.             // System.out.println("key: " + key);
48.             SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(), "HmacSHA1");
49.             Mac mac = Mac.getInstance("HmacSHA1");
50.             mac.init(signingKey);
51.             byte[] rawHmac = mac.doFinal(data.getBytes());
52.             result = (new BASE64Encoder()).encode(rawHmac);
53.         } catch (Exception e) {
54.             throw new Error("Failed to generate HMAC : " + e.getMessage());
55.         }
56.         return result;
57.     }
59.     /*
60.      * 等同于javaScript中的 new Date().toUTCString();
61.      */
62.     public static String toGMTString(Date date) {
63.         SimpleDateFormat df = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss z", Locale.UK);
64.         df.setTimeZone(new java.util.SimpleTimeZone(0, "GMT"));
65.         return df.format(date);
66.     }
68.     /*
69.      * 发送POST请求
70.      */
71.     public static String sendPost(String url, String body, String ak_id, String ak_secret) {
72.         PrintWriter out = null;
73.         BufferedReader in = null;
74.         String result = "";
75.         try {
76.             URL realUrl = new URL(url);
78.             /*
79.              * http header 参数
80.              */
81.             String method = "POST";
82.             String accept = "json";
83.             String content_type = "application/json";
84.             String path = realUrl.getFile();
86.             String date = toGMTString(new Date());
88.             // 1.对body做MD5+BASE64加密
89.             String bodyMd5 = MD5Base64(body);
90.             String stringToSign = method + "\n" + accept + "\n" + bodyMd5 + "\n" + content_type + "\n" + date + "\n"
91.                     + path;
92.             // 2.计算 HMAC-SHA1
93.             String signature = HMACSha1(stringToSign, ak_secret);
94.             // 3.得到 authorization header
95.             String authHeader = "Dataplus " + ak_id + ":" + signature;
97.             // 打开和URL之间的连接
98.             URLConnection conn = realUrl.openConnection();
99.             // 设置通用的请求属性
100.             conn.setRequestProperty("accept", accept);
101.             conn.setRequestProperty("content-type", content_type);
102.             conn.setRequestProperty("date", date);
103.             conn.setRequestProperty("Authorization", authHeader);
104.             conn.setRequestProperty("Accept-Charset", "UTF-8");
105.             // 发送POST请求必须设置如下两行
106.             conn.setDoOutput(true);
107.             conn.setDoInput(true);
108.             // 获取URLConnection对象对应的输出流
109.             out = new PrintWriter(conn.getOutputStream());
110.             // 发送请求参数
111.             out.print(body);
112.             // flush输出流的缓冲
113.             out.flush();
114.             // 定义BufferedReader输入流来读取URL的响应
115.             InputStream is;
116.             HttpURLConnection httpconn = (HttpURLConnection) conn;
117.             if (httpconn.getResponseCode() == 200) {
118.                 is = httpconn.getInputStream();
119.             } else {
120.                 is = httpconn.getErrorStream();
121.             }
122.             InputStreamReader sr = new InputStreamReader(is,"utf-8");
123.             in = new BufferedReader(sr);
124.             String line;
125.             while ((line = in.readLine()) != null) {
126.                 result += line;
127.             }
128.         } catch (Exception e) {
129.             System.out.println("发送 POST 请求出现异常！" + e);
130.             e.printStackTrace();
131.         }
132.         // 使用finally块来关闭输出流、输入流
133.         finally {
134.             try {
135.                 if (out != null) {
136.                     out.close();
137.                 }
138.                 if (in != null) {
139.                     in.close();
140.                 }
141.             } catch (IOException ex) {
142.                 ex.printStackTrace();
143.             }
144.         }
145.         return result;
146.     }
148. }