Java给指定URL字符串添加值和获取URL字符串中的参数值

川长思鸟来 2023-10-17 23:13 32阅读 0赞

/**
     * 在指定url后追加参数
     * @param url
     * @param data 参数集合 key = value
     * @return
     */
    private static String appendUrl(String url, Map<String, Object> data) {
        String newUrl = url;
        StringBuffer param = new StringBuffer();
        for (String key : data.keySet()) {
            param.append(key + "=" + data.get(key).toString() + "&");
        }
        String paramStr = param.toString();
        paramStr = paramStr.substring(0, paramStr.length() - 1);
        if (newUrl.indexOf("?") >= 0) {
            newUrl += "&" + paramStr;
        } else {
            newUrl += "?" + paramStr;
        }
        return newUrl;
    }
    
    /**
     * 获取指定url中的某个参数
     * @param url
     * @param name
     * @return
     */
    public static String getParamByUrl(String url, String name) {
        url += "&";
        String pattern = "(\\?|&){1}#{0,1}" + name + "=[a-zA-Z0-9]*(&{1})";
    
        Pattern r = Pattern.compile(pattern);
    
        Matcher m = r.matcher(url);
        if (m.find( )) {
            System.out.println(m.group(0));
            return m.group(0).split("=")[1].replace("&", "");
        } else {
            return null;
        }
    }
    
    public static void main(String[] args) throws Exception {
        // Map<String, Object> param = new HashMap<>();
        // param.put("id", 1);
        // param.put("age", 18);
        // System.out.println(appendUrl("http://test.com", param));
        // System.out.println(appendUrl("http://test.com?name=a", param));
        // String url = "http://test.com?name=abd&id=1&age=18";
        String url = "http://www.xxxxx.com/login.do?#access_token=xxxx&express_id=yyyyy";
        System.out.println(getParamByUrl(url, "express_id"));
    }