package com.panzhihua.sangeshenbian.utils;
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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.nio.charset.StandardCharsets;
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import java.security.MessageDigest;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Map;
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public class SignatureUtil {
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private static final String ACCESS_TOKEN_URL = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s";
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private static final String JSAPI_TICKET_URL = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=%s&type=jsapi";
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public static String getAccessToken(String appId, String appSecret) throws Exception {
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String url = String.format(ACCESS_TOKEN_URL, appId, appSecret);
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URL obj = new URL(url);
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HttpURLConnection con = (HttpURLConnection) obj.openConnection();
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con.setRequestMethod("GET");
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BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
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String inputLine;
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StringBuffer response = new StringBuffer();
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while ((inputLine = in.readLine()) != null) {
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response.append(inputLine);
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}
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in.close();
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Map<String, String> result = parseJson(response.toString());
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return result.get("access_token");
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}
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public static String getJsApiTicket(String accessToken) throws Exception {
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String url = String.format(JSAPI_TICKET_URL, accessToken);
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URL obj = new URL(url);
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HttpURLConnection con = (HttpURLConnection) obj.openConnection();
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con.setRequestMethod("GET");
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BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
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String inputLine;
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StringBuffer response = new StringBuffer();
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while ((inputLine = in.readLine()) != null) {
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response.append(inputLine);
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}
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in.close();
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Map<String, String> result = parseJson(response.toString());
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return result.get("ticket");
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}
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private static Map<String, String> parseJson(String json) {
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// 简单的JSON解析，实际项目中可以使用更强大的库如Jackson或Gson
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Map<String, String> map = new HashMap<>();
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String[] keyValuePairs = json.replace("{", "").replace("}", "").split(",");
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for (String pair : keyValuePairs) {
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String[] entry = pair.split(":");
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map.put(entry[0].trim().replace("\"", ""), entry[1].trim().replace("\"", ""));
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}
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return map;
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}
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public static String getSignature(String jsapiTicket, String nonceStr, String timestamp, String url) throws Exception {
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Map<String, String> params = new HashMap<>();
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params.put("jsapi_ticket", jsapiTicket);
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params.put("noncestr", nonceStr);
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params.put("timestamp", timestamp);
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params.put("url", url);
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String[] keys = params.keySet().toArray(new String[0]);
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Arrays.sort(keys);
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StringBuilder sb = new StringBuilder();
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for (String key : keys) {
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sb.append(key).append("=").append(params.get(key)).append("&");
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}
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sb.deleteCharAt(sb.length() - 1); // Remove the last '&'
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MessageDigest md = MessageDigest.getInstance("SHA-1");
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byte[] hashBytes = md.digest(sb.toString().getBytes(StandardCharsets.UTF_8));
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StringBuilder hexString = new StringBuilder();
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for (byte b : hashBytes) {
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String hex = Integer.toHexString(0xff & b);
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if (hex.length() == 1) {
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hexString.append('0');
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}
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hexString.append(hex);
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}
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return hexString.toString();
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}
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}
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