java 微信支付签名生成方法

public static String getSign(Map<String,Object> map){
ArrayList<String> list = new ArrayList<String>();
for(Map.Entry<String,Object> entry:map.entrySet()){
if(entry.getValue()!=""){
list.add(entry.getKey() + "=" + entry.getValue() + "&");
}
}
int size = list.size();
String [] arrayToSort = list.toArray(new String[size]);
Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
StringBuilder sb = new StringBuilder();
for(int i = 0; i < size; i ++) {
sb.append(arrayToSort[i]);
}
String result = sb.toString();
result += "key=" + Configure.getKey();
//Util.log("Sign Before MD5:" + result);
result = MD5.MD5Encode(result).toUpperCase();
//Util.log("Sign Result:" + result);
return result;
}