UrlUtils工具類，Java URL工具類，Java URL鏈接工具類

UrlUtils工具類，Java URL工具類，Java URL鏈接工具類

©Copyright 蕃薯耀 2017年7月15日

http://www.cnblogs.com/fanshuyao/

Java代碼 收藏代碼
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class UrlUtils {

/** 
 * 向url鏈接追加參數 
 * @param url 
 * @param params Map<String, String> 
 * @return 
 */  
public static String appendParams(String url, Map<String, String> params){  
    if(StrUtils.isBlank(url)){  
        return "";  
    }else if(StrUtils.isEmptyMap(params)){  
        return url.trim();  
    }else{  
        StringBuffer sb = new StringBuffer("");  
        Set<String> keys = params.keySet();  
        for (String key : keys) {  
            sb.append(key).append("=").append(params.get(key)).append("&");  
        }  
        sb.deleteCharAt(sb.length() - 1);  
          
        url = url.trim();  
        int length = url.length();  
        int index = url.indexOf("?");  
        if(index > -1){//url說明有問號  
            if((length - 1) == index){//url最後一個符號爲？，如：http://wwww.baidu.com?  
                url += sb.toString();  
            }else{//情況爲：http://wwww.baidu.com?aa=11  
                url += "&" + sb.toString();  
            }  
        }else{//url後面沒有問號，如：http://wwww.baidu.com  
            url += "?" + sb.toString();  
        }  
        return url;  
    }  
}  
  
/** 
 * 向url鏈接追加參數(單個) 
 * @param url 
 * @param name String 
 * @param value String 
 * @return 
 */  
public static String appendParam(String url, String name, String value){  
    if(StrUtils.isBlank(url)){  
        return "";  
    }else if(StrUtils.isBlank(name)){  
        return url.trim();  
    }else{  
        Map<String, String> params = new HashMap<String, String>();  
        params.put(name, value);  
        return appendParams(url, params);  
    }  
}  
  
/** 
 * 移除url鏈接的多個參數 
 * @param url String 
 * @param paramNames String[] 
 * @return 
 */  
public static String removeParams(String url, String... paramNames){  
    if(StrUtils.isBlank(url)){  
        return "";  
    }else if(StrUtils.isEmptyArray(paramNames)){  
        return url.trim();  
    }else{  
        url = url.trim();  
        int length = url.length();  
        int index = url.indexOf("?");  
        if(index > -1){//url說明有問號  
            if((length - 1) == index){//url最後一個符號爲？，如：http://wwww.baidu.com?  
                return url;  
            }else{//情況爲：http://wwww.baidu.com?aa=11或http://wwww.baidu.com?aa=或http://wwww.baidu.com?aa  
                String baseUrl = url.substring(0, index);  
                String paramsString = url.substring(index + 1);  
                String[] params = paramsString.split("&");  
                if(!StrUtils.isEmptyArray(params)){  
                    Map<String, String> paramsMap = new HashMap<String, String>();  
                    for (String param : params) {  
                        if(!StrUtils.isBlank(param)){  
                            String[] oneParam = param.split("=");  
                            String paramName = oneParam[0];  
                            int count = 0;  
                            for(int i=0; i<paramNames.length; i++){  
                                if(paramNames[i].equals(paramName)){  
                                    break;  
                                }  
                                count ++;  
                            }  
                            if(count == paramNames.length){  
                                paramsMap.put(paramName, (oneParam.length > 1)?oneParam[1]:"");  
                            }  
                        }  
                    }  
                    if(!StrUtils.isEmptyMap(paramsMap)){  
                        StringBuffer paramBuffer = new StringBuffer(baseUrl);  
                        paramBuffer.append("?");  
                        Set<String> set = paramsMap.keySet();  
                        for (String paramName : set) {  
                            paramBuffer.append(paramName).append("=").append(paramsMap.get(paramName)).append("&");  
                        }  
                        paramBuffer.deleteCharAt(paramBuffer.length() - 1);  
                        return paramBuffer.toString();  
                    }  
                    return baseUrl;  
                }  
            }  
        }  
        return url;  
    }  
}  
  
public static void main(String[] args) {  
    /*String a = "http://wwww.baidu.com"; 
    String b = "http://wwww.baidu.com?"; 
    String c = "http://wwww.baidu.com?aa=11"; 
    System.out.println("a="+appendParam(a, "bb", "1")); 
    System.out.println("b="+appendParam(b, "bb", "1")); 
    System.out.println("c="+appendParam(c, "bb", "1"));*/  
      
    String d = "http://wwww.baidu.com?aa";  
    String e = "http://wwww.baidu.com?aa=11&bb=22&cc=33";  
    String f = "http://wwww.baidu.com?aa=11&bb=22&cc=33&dd=";  
    String g = "http://wwww.baidu.com?aa=11&bb=22&cc=33&dd";  
    /*List<String> params = new ArrayList<String>(); 
    params.add("aa"); 
    System.out.println("d="+removeParams(d, params)); 
    params.add("bb"); 
    System.out.println("e="+removeParams(e, params)); 
    params.add("cc"); 
    System.out.println("f="+removeParams(f, params)); 
    params.add("dd"); 
    System.out.println("g="+removeParams(g, params));*/  
    System.out.println("g="+removeParams(g, "cc","aa"));  
}  

}