map转URL

package com.psm.util;

import java.util.Map;

public class MapSwitchUrl {
    
    public static String getUrlParamsByMap(Map<String, Object> map) {  
        if (map == null) {  
            return "";  
        }
        StringBuffer sb = new StringBuffer();  
        for (Map.Entry<String, Object> entry : map.entrySet()) {  
            sb.append(entry.getKey() + "=" + entry.getValue());  
            sb.append("&");  
        }  
        String s = sb.toString();  
        if (s.endsWith("&")) {  
            s = org.apache.commons.lang.StringUtils.substringBeforeLast(s, "&");  
        }  
        return s;  
    }  
}