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2017-08-01 06:15 阅读 2.9k

java中如何获取微信的jsapi_ticket

1

微信的官方文档给的java代码,没有获取jsapi_ticket,代码如下:
import java.util.UUID;
import java.util.Map;
import java.util.HashMap;
import java.util.Formatter;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.io.UnsupportedEncodingException;

class Sign {
public static void main(String[] args) {
String jsapi_ticket = "jsapi_ticket";

    // 注意 URL 一定要动态获取,不能 hardcode
    String url = "http://example.com";
    Map<String, String> ret = sign(jsapi_ticket, url);
    for (Map.Entry entry : ret.entrySet()) {
        System.out.println(entry.getKey() + ", " + entry.getValue());
    }
};

public static Map<String, String> sign(String jsapi_ticket, String url) {
    Map<String, String> ret = new HashMap<String, String>();
    String nonce_str = create_nonce_str();
    String timestamp = create_timestamp();
    String string1;
    String signature = "";

    //注意这里参数名必须全部小写,且必须有序
    string1 = "jsapi_ticket=" + jsapi_ticket +
              "&noncestr=" + nonce_str +
              "&timestamp=" + timestamp +
              "&url=" + url;
    System.out.println(string1);

    try
    {
        MessageDigest crypt = MessageDigest.getInstance("SHA-1");
        crypt.reset();
        crypt.update(string1.getBytes("UTF-8"));
        signature = byteToHex(crypt.digest());
    }
    catch (NoSuchAlgorithmException e)
    {
        e.printStackTrace();
    }
    catch (UnsupportedEncodingException e)
    {
        e.printStackTrace();
    }

    ret.put("url", url);
    ret.put("jsapi_ticket", jsapi_ticket);
    ret.put("nonceStr", nonce_str);
    ret.put("timestamp", timestamp);
    ret.put("signature", signature);

    return ret;
}

private static String byteToHex(final byte[] hash) {
    Formatter formatter = new Formatter();
    for (byte b : hash)
    {
        formatter.format("%02x", b);
    }
    String result = formatter.toString();
    formatter.close();
    return result;
}

private static String create_nonce_str() {
    return UUID.randomUUID().toString();
}

private static String create_timestamp() {
    return Long.toString(System.currentTimeMillis() / 1000);
}

}

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