java web 中文乱码

public String youMethodName(HttpServletRequest req,...){
    String yourParam = req.getParameter("paramName");
    Matcher m = Pattern.compile("[\u4e00-\u9fa5]").matcher(yourParam);  
                //如果没有发现中文，说明使用get方式传递了中文，需要使用下面的方法转换  
                if (!m.find()) {  
                    programaName = this.tools.decodeUTF8FromIso88591(programaName);
                }  
    public String decodeUTF8FromIso88591(String paramStr) {
            if (null == paramStr || paramStr.length() <= 0) {
                return null;
            }
            try {
                byte[] bytes = paramStr.getBytes("iso-8859-1");
                paramStr = new String(bytes, "utf-8");
            } catch (Exception e) {
                e.printStackTrace();
            }
            return paramStr;
        }
}

var param = encodeURIComponent("yourParam");

String param = encodeURIComponent(req.getParameter(param));

console.log(encodeURIComponent("!@#$%^&"));
!%40%23%24%25%5E%26