Convert Map<String, String> to a string of the form name=value&name=value


    /**
     * 将Map<String, String>转换为name=value&name=value形式的字符串
     * @param map
     * @return
     */
    public static String getNamValStr(Map<String, String> map){
        StringBuilder str = new StringBuilder();


        Set<String> set = map.keySet();
        for (String key : set) {
            str.append(key).append("=")
                    .append(map.get(key).toString()).append("&");
        }
        return str.toString().substring(0, str.lastIndexOf("&"));
    }

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