java实现对map的字典序排序操作示例

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import org.apache.commons.codec.digest.DigestUtils;
import com.opensymphony.xwork2.ActionSupport;
public class Test extends ActionSupport {
//测试页面
public String test(){
return SUCCESS;
}
public static void main(String [] args){
String jsapi_ticket="kgt8ON7yVITDhtdwci0qef4Fd1u2d2iWwTE-nt2tSR7Me3FmWAhtxJa3QQCiMdLper4cUrqpDxkDJ6ljLgc7PA";
int timestamp=1460637652;
String nonceStr="C1WNnEpCwq4wa158";
String url="http://qq.test.com/test/index.html";
//字典序排序
HashMap<String,String> map=new HashMap<String,String>();
map.put("jsapi_ticket", jsapi_ticket);
map.put("timestamp", timestamp+"");
map.put("nonceStr", nonceStr);
map.put("url", url);
Collection<String> keyset= map.keySet();
List list=new ArrayList<String>(keyset);
Collections.sort(list);
//这种打印出的字符串顺序和微信官网提供的字典序顺序是一致的
for(int i=0;i<list.size();i++){
System.out.println(list.get(i)+"="+map.get(list.get(i)));
}
//微信官网写的按照字典序排序后的字符串
String sign="jsapi_ticket="+jsapi_ticket+"&noncestr="+nonceStr+"×tamp="+timestamp+"&url="+url;
//System.out.println(DigestUtils.shaHex("jsapi_ticket=sM4AOVdWfPE4DxkXGEs8VMCPGGVi4C3VM0P37wVUCFvkVAy_90u5h9nbSlYy3-Sl-HhTdfl2fzFy1AOcHKP7qg&noncestr=Wm3WZYTPz0wzccnW×tamp=1414587457&url=http://mp.weixin.qq.com?params=value"));
//微信返回的加密串
String signature=DigestUtils.shaHex(sign);//sha1加密
System.out.println(signature);
}
}