Java URL链接动态添加参数，Java URL链接删除参数，UrlUtils链接参数工具类

Java URL链接动态添加参数，Java URL链接删除参数，UrlUtils链接参数工具类

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©Copyright 蕃薯耀 2021-01-22

https://www.cnblogs.com/fanshuyao/

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
  
public class UrlUtils {  
    
    private static Logger log = Logger.getLogger(UrlUtils.class);
    
    public static final String QUESTION_MARK = "?";
    public static final String AND_MARK = "&";
    public static final String EQUAL_MARK = "=";
    
    
    /**
     * 获取链接的参数
     * @param url 链接
     * @return
     */
    public static LinkedHashMap<String, String> getParamsMap(String url){
        log.info("url=" + url);
        
        if(StringUtils.isBlank(url)){  
            return null;  
        }
        
        url = url.trim();
        int length = url.length();  
        int index = url.indexOf(QUESTION_MARK); 
        
        if(index > -1){//url说明有问号  
            if((length - 1) == index){//url最后一个符号为？，如：http://wwww.baidu.com?  
                return null;  
                
            }else{
                //情况为：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);
                
                log.info("baseUrl=" + baseUrl);
                log.info("paramsString=" + paramsString);
                
                if(!StringUtils.isBlank(paramsString)){
                    LinkedHashMap<String, String> paramsMap = new LinkedHashMap<String, String>(); 
                    String[] params = paramsString.split(AND_MARK); 
                    
                    for (String param : params) {  
                        if(!StringUtils.isBlank(param)){  
                            String[] oneParam = param.split(EQUAL_MARK);  
                            String paramName = oneParam[0]; 
                            
                            if(!StringUtils.isBlank(paramName)){
                                if(oneParam.length > 1){
                                    paramsMap.put(paramName.trim(), oneParam[1]);//键可以去空格，值不能去空格
                                    
                                }else{
                                    paramsMap.put(paramName.trim(), "");
                                }
                            }
                            
                        }  
                    }
                    return paramsMap;
                }
            }  
        }
        
        return null;
    }
    
    
    /** 
     * 向url链接追加参数（会覆盖已经有的参数）
     * @param url 链接地址
     * @param params LinkedHashMap<String, String> 参数
     * @param isOverride 是否覆盖参数，true表示将新参数覆盖链接原参数，false不覆盖
     * @return 
     */  
    public static String addParams(String url, LinkedHashMap<String, String> params, boolean isOverride){  
        if(StringUtils.isBlank(url)){  
            return "";  
            
        }else if(params == null || params.size() < 1){  
            return url.trim();
            
        }else{
            
            url = url.trim();  
            int index = url.indexOf(QUESTION_MARK);
            String baseUrl = "";
            
            if(index > -1){
                baseUrl = url.substring(0, index);
                
            }else{
                baseUrl = url;
            }
            
            LinkedHashMap<String, String> paramsMapInUrl = getParamsMap(url);
            
            if(paramsMapInUrl == null){
                paramsMapInUrl = new LinkedHashMap<String, String>();
            }
            
            if(!isOverride){
                //移除Url链接已经存在的参数
                LinkedHashMap<String, String> newParams = new LinkedHashMap<String, String>(params.size());
                
                for (Map.Entry<String, String> entry : params.entrySet()) {
                    if(!StringUtils.isBlank(entry.getKey())){
                        newParams.put(entry.getKey().trim(), entry.getValue());
                    }
                }
                
                for (Map.Entry<String, String> entry : newParams.entrySet()) {
                    for (Map.Entry<String, String> urlEntry : paramsMapInUrl.entrySet()) {
                        if(!StringUtils.isBlank(entry.getKey())){
                            if(entry.getKey().trim().equals(urlEntry.getKey())){
                                params.remove(entry.getKey().trim());
                            }
                        }
                    }
                }
            }
            
            
            for (Map.Entry<String, String> entry : params.entrySet()) {
                paramsMapInUrl.put(entry.getKey().trim(), entry.getValue());
            }
            
            //重新拼接链接
            if(paramsMapInUrl != null && paramsMapInUrl.size() > 0){
                StringBuffer paramBuffer = new StringBuffer(baseUrl);  
                paramBuffer.append(QUESTION_MARK);  
                Set<String> set = paramsMapInUrl.keySet();  
                for (String paramName : set) {  
                    paramBuffer.append(paramName).append(EQUAL_MARK)
                    .append(paramsMapInUrl.get(paramName) == null ? "" : paramsMapInUrl.get(paramName))
                    .append(AND_MARK);  
                }  
                paramBuffer.deleteCharAt(paramBuffer.length() - 1);  
                return paramBuffer.toString();  
            }  
            return baseUrl;
              
        }  
    }
    
    
    /** 
     * 向url链接追加参数(单个) （会覆盖已经有的参数）
     * @param url 链接地址
     * @param name String 参数名
     * @param value String 参数值
     * @param isOverride 是否覆盖参数，true表示将新参数覆盖链接原参数，false不覆盖
     * @return 
     */  
    public static String addParam(String url, String name, String value, boolean isOverride){  
        if(StringUtils.isBlank(url)){  
            return "";  
            
        }else if(StringUtils.isBlank(name)){  
            return url.trim(); 
            
        }else{  
            LinkedHashMap<String, String> params = new LinkedHashMap<String, String>();  
            params.put(name.trim(), value);  
            return addParams(url, params, isOverride);  
        }  
    }
    
    
    /** 
     * 向url链接追加参数(单个) （会覆盖已经有的参数）
     * @param url 链接地址
     * @param name String 参数名
     * @param value String 参数值
     * @return 
     */  
    public static String addParam(String url, String name, String value){  
        return addParam(url, name, value, true); 
    }
    
    
    /** 
     * 向url链接追加参数(单个) （不会覆盖已经有的参数）
     * @param url 链接地址
     * @param name String 参数名
     * @param value String 参数值
     * @return 
     */  
    public static String addParamNotExist(String url, String name, String value){  
        return addParam(url, name, value, false);
    }
    
    
    /** 
     * 向url链接追加参数（会覆盖已经有的参数）
     * @param url 链接地址
     * @param params LinkedHashMap<String, String> 参数
     * @return 
     */  
    public static String addParams(String url, LinkedHashMap<String, String> params){  
        return addParams(url, params, true);
    }
    
    
    /** 
     * 向url链接追加参数（不会覆盖已经有的参数）
     * @param url 链接地址
     * @param params LinkedHashMap<String, String> 参数
     * @return 
     */  
    public static String addParamsNotExist(String url, LinkedHashMap<String, String> params){  
        return addParams(url, params, false);
    }
    
      
    /** 
     * 移除url链接的多个参数 
     * @param url String 链接地址
     * @param paramNames String... 参数
     * @return 
     */  
    public static String removeParams(String url, String... paramNames){  
        if(StringUtils.isBlank(url)){  
            return "";  
            
        }else if(paramNames == null || paramNames.length < 1){  
            return url.trim(); 
            
        }else{
            url = url.trim();
            int length = url.length();  
            int index = url.indexOf(QUESTION_MARK);
            
            
            if(index > -1){//url有问号
                
                if((length - 1) == index){//url最后一个符号为？，如：http://wwww.baidu.com?  
                    return url;  
                    
                }else{
                    LinkedHashMap<String, String> paramsMap = getParamsMap(url);
                    
                    //删除参数
                    if(paramsMap != null && paramsMap.size() > 0){
                        for (String paramName : paramNames) {
                            if(!StringUtils.isBlank(paramName)){
                                paramsMap.remove(paramName.trim());
                            }
                        }
                    }
                    
                    String baseUrl = url.substring(0, index);
                    
                    //重新拼接链接
                    if(paramsMap != null && paramsMap.size() > 0){
                        StringBuffer paramBuffer = new StringBuffer(baseUrl);  
                        paramBuffer.append(QUESTION_MARK);  
                        Set<String> set = paramsMap.keySet();  
                        for (String paramName : set) {  
                            paramBuffer.append(paramName).append(EQUAL_MARK).append(paramsMap.get(paramName)).append(AND_MARK);  
                        }  
                        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";
        String d = "http://wwww.baidu.com?aa";  
        String e = "http://wwww.baidu.com?aa=11&bb=222&cc=33";  
        String f = "http://wwww.baidu.com?aa=11&bb=222&cc=33&dd=";  
        String g = "http://wwww.baidu.com?aa=111&bb=222&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","dd"));
        System.out.println("g2="+removeParams(g, "cc","aa","dd"));
        System.out.println("d="+removeParams(d, "cc"));
        System.out.println("d2="+removeParams(d, "aa"));
        System.out.println("a="+removeParams(a, "aa"));
        System.out.println("b="+removeParams(b, "aa"));
        */
        
        /*
        System.out.println("a==="+addParam(a, "p", "cc"));
        System.out.println("b==="+addParam(b, "p", "cc"));
        System.out.println("c==="+addParam(c, "p", "cc"));
        System.out.println("d==="+addParam(d, "p", "cc"));
        */
        
        /*
        System.out.println("g1==="+addParam(g, "bb", "000"));
        System.out.println("g2==="+addParamNotExist(g, "bb", "000"));
        */
        
        /*
        LinkedHashMap<String, String> paramsMap = new LinkedHashMap<String, String>();
        paramsMap.put("jj", "j13");
        paramsMap.put("kkk", "k1243");
        paramsMap.put("mm", "");
        paramsMap.put("nn", null);
        paramsMap.put("bb", "new");
        
        //System.out.println("a==="+addParams(a, paramsMap));
        //System.out.println("b==="+addParams(b, paramsMap));
        //System.out.println("c==="+addParams(c, paramsMap));
        //System.out.println("d==="+addParams(d, paramsMap));
        
        System.out.println("f1==="+addParams(f, paramsMap));
        System.out.println("f2==="+addParamsNotExist(f, paramsMap));
        */
        
        
        //System.out.println("g2="+getParamsMap(g)); 
    }
    
}

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©Copyright 蕃薯耀 2021-01-22

https://www.cnblogs.com/fanshuyao/