最初将access_token放到数据库中，每次获取时判断是否过期。可以解决access_token的有效期及访问次数问题。但是最近需要将公众号与系统做接口，取消公众号的数据库，此时再将access_token等放到系统的数据库中就不合适了。
受益于薛喜麟的这篇文章：微信处理access_token全局缓存的问题，实现了用单例模式来缓存access_token。
记一下，供以后查用。
mark一下自己的代码结构：
public class TokenSingleton {
//缓存accessToken 的Map ,map中包含 一个accessToken 和 缓存的时间戳
private Map map = new HashMap<>();
private TokenSingleton() {
}
private static TokenSi
ngleton single = null;
// 静态工厂方法
public static TokenSingleton getInstance() {
if (single == null) {
single = new TokenSingleton();
}
return single;
}
public Map getMap() {
String time = map.get("time");
String accessToken = map.get("access_token");
Long nowDate = new Date().getTime();
if (accessToken != null && time != null && nowDate - Long.parseLong(time) < 6000*1000) {
System.out.println("accessToken存在，且没有超时 ， 返回单例");
} else {
System.out.println("accessToken 超时 ， 或者不存在 ， 重新获取");
String access_token=JSSDKUtil.getAccessToken();
//这里是直接调用微信的API去直接获取 accessToken 和Jsapi_ticket 获取
String jsapi_token = JSSDKUtil.getTicket(access_token);
//"获取jsapi_token";
map.put("time", nowDate + "");
map.put("access_token", access_token);
map.put("jsapi_token", jsapi_token);
}
return map;
}
public void setMap(Map map) {
this.map = map;
}
public static TokenSingleton getSingle() {
return single;
}
public static void setSingle(TokenSingleton single) {
TokenSingleton.single = single;
}
} 另外一个工具类JSSDKUtil.java截取了部分:
public static String getSignature(String accessToken,String jsapi_ticket,String noncestr,String timestamp,String url){
System.out.println("accessToken:"+accessToken+"\njsapi_ticket:"+jsapi_ticket+"\n时间戳："+timestamp+"\n随机字符串："+noncestr+"\nURL："+url);
//5、将参数排序并拼接字符串
String str = "jsapi_ticket="+jsapi_ticket+"&noncestr="+noncestr+"×tamp="+timestamp+"&url="+url;
//6、将字符串进行sha1加密
String signature =SHA1(str);
System.out.println("参数："+str+"\n签名："+signature);
return signature;
}
public static String getAccessToken() {
String wx_appid = getProperties("wx_appid");
String wx_appsecret = getProperties("wx_appsecret");
String access_token = "";
String grant_type = "client_credential";//获取access_token填写client_credential
String AppId=wx_appid;//第三方用户唯一凭证
String secret=wx_appsecret;//第三方用户唯一凭证密钥，即appsecret
//这个url链接地址和参数皆不能变
String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type="+grant_type+"&appid="+AppId+"&secret="+secret;
try {
URL urlGet = new URL(url);
HttpURLConnection http = (HttpURLConnection) urlGet.openConnection();
http.setRequestMethod("GET"); // 必须是get方式请求
http.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
http.setDoOutput(true);
http.setDoInput(true);
System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
http.connect();
InputStream is = http.getInputStream();
int size = is.available();
byte[] jsonBytes = new byte[size];
is.read(jsonBytes);
String message = new String(jsonBytes, "UTF-8");
JSONObject demoJson = JSONObject.fromObject(message);
System.out.println("JSON字符串："+demoJson);
access_token = demoJson.getString("access_token");
is.close();
} catch (Exception e) {
e.printStackTrace();
}
return access_token;
}
public static String getTicket(String access_token) {
String ticket = null;
String url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token="+ access_token +"&type=jsapi";//这个url链接和参数不能变
try {
URL urlGet = new URL(url);
HttpURLConnection http = (HttpURLConnection) urlGet.openConnection();
http.setRequestMethod("GET"); // 必须是get方式请求
http.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
http.setDoOutput(true);
http.setDoInput(true);
System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
http.connect();
InputStream is = http.getInputStream();
int size = is.available();
byte[] jsonBytes = new byte[size];
is.read(jsonBytes);
String message = new String(jsonBytes, "UTF-8");
JSONObject demoJson = JSONObject.fromObject(message);
System.out.println("JSON字符串："+demoJson);
ticket = demoJson.getString("ticket");
is.close();
} catch (Exception e) {
e.printStackTrace();
}
return ticket;
}
public static String SHA1(String decript) {
try {
MessageDigest digest = java.security.MessageDigest.getInstance("SHA-1");
digest.update(decript.getBytes());
byte messageDigest[] = digest.digest();
// Create Hex String
StringBuffer hexString = new StringBuffer();
// 字节数组转换为 十六进制 数
for (int i = 0; i < messageDigest.length; i++) {
String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
if (shaHex.length() < 2) {
hexString.append(0);
}
hexString.append(shaHex);
}
return hexString.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return "";
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