java签名字母排序

String testStr="linkid,money,mobile,partner,pex,imei,imsi,spType,spPayType,terminalIP,transform,location,gameName,chargeName";
String [] params=testStr.split(",");
Map<String,String> maps=new TreeMap<String,String>();
for(String str :params){
maps.put(str, str);
}

Iterator<String> its=maps.keySet().iterator();
StringBuffer buf=new StringBuffer();
while(its.hasNext()){
buf.append(its.next()).append(",");
}
System.out.println(buf.toString());