/**
* 微信支付签名算法sign
* @param characterEncoding
* @param parameters
* @return
*/
@Test
public static String createSign(String characterEncoding,SortedMap<Object,Object> parameters){
StringBuffer sb = new StringBuffer();
Set es = parameters.entrySet();//所有参与传参的参数按照accsii排序（升序）
Iterator it = es.iterator();
while(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
String k = (String)entry.getKey();
Object v = entry.getValue();
if(null != v && !"".equals(v)
&& !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + WeChatPayUtils.key);
System.out.println("字符串:"+sb.toString());
String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
return sign;
}
MD5Util工具类代码如下:
package cn.cqzdkj.utils; import java.security.MessageDigest; public class MD5Util { private static String byteArrayToHexString(byte b[]) { StringBuffer resultSb = new StringBuffer(); for (int i = 0; i < b.length; i++) resultSb.append(byteToHexString(b[i])); return resultSb.toString(); } private static String byteToHexString(byte b) { int n = b; if (n < 0) n += 256; int d1 = n / 16; int d2 = n % 16; return hexDigits[d1] + hexDigits[d2]; } public static String MD5Encode(String origin, String charsetname) { String resultString = null; try { resultString = new String(origin); MessageDigest md = MessageDigest.getInstance("MD5"); if (charsetname == null || "".equals(charsetname)) resultString = byteArrayToHexString(md.digest(resultString .getBytes())); else resultString = byteArrayToHexString(md.digest(resultString .getBytes(charsetname))); } catch (Exception exception) { } return resultString; } private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" }; }
然后在需要的地方直接调用上面的ctreasign这个方法就行了
SortedMap<Object,Object> parameters = new TreeMap<Object,Object>();
parameters.put("appid", appid);
parameters.put("mch_id", mch_id);
parameters.put("nonce_str",nonce_str);
parameters.put("body", body);
parameters.put("out_trade_no", "20170215");
parameters.put("total_fee", 1);
parameters.put("spbill_create_ip", "x.x.x.x");
parameters.put("notify_url","http://xxxxx.com");
parameters.put("trade_type", "JSAPI");
parameters.put("openid", "oGY_ZvxxxxxM");
parameters.put("sign","");
String characterEncoding = "UTF-8";
String mySign = createSign(characterEncoding,parameters);
System.out.println("我 的签名是："+mySign);
转载：http://blog.csdn.net/qq_25821067/article/details/55253613