Map拼接URL地址

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * @Author: hoje
 * Description:
 * Date： Created in 10:05 2019/12/6 0006
 * Modified by:
 */
public class Map2Equal {

    public static void main(String[] args) {
        Map<String, String> data = new HashMap<>();
        data.put("aa", "11");
        data.put("bb", "22");
        data.put("cc", "33");
        StringBuffer retStr = new StringBuffer("https://www.baidu.com");
        StringBuffer sb = new StringBuffer();
        retStr.append("?");
        if (data != null) {
            Iterator i = data.entrySet().iterator();

            while (i.hasNext()) {
                Map.Entry<String, String> entry = (Map.Entry) i.next();
                sb.append("&").append((String) entry.getKey()).append("=").append((String) entry.getValue());
            }
            String param = sb.substring(1);
            retStr.append(param);
        }

        System.out.println(retStr);
    }
}

测试结果：

https://www.baidu.com?aa=11&bb=22&cc=33