使用拦截器或者切面什么的时候，会获取request里的参数，当参数是中文的时候就容易出现中文乱码

因为传输的时候使用的字符编码是 iso8859-1，所以需要转换一下

request.getParameter()获取单个参数的值，而getRequestParamsMap则是获取到的参数转换成map类型

首先是要获取到request

HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();

得到request后进行处理，得到map，方法如下

方法一：返回Map<String, String>

public static Map<String, String> getRequestParamsMap(HttpServletRequest request) {
        Map<String, String> params = new HashMap<String, String>();
        Map requestParams = request.getParameterMap();
        for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext(); ) {
            String name = (String) iter.next();
            String[] values = (String[]) requestParams.get(name);
            String valueStr = "";
            for (int i = 0; i < values.length; i++) {
                valueStr = (i == values.length - 1) ? valueStr + values[i] : valueStr + values[i] + ",";
            }
            try {
                //将获取到的value值字符编码进行转换
                valueStr = new String(valueStr.getBytes("iso8859-1"), request.getCharacterEncoding());
            } catch (Exception e) {
                logger.error(HttpHelper.class + "字符转化失败!", e);
            }
            // 乱码解决，这段代码在出现乱码时使用。
            params.put(name, valueStr);
        }
        return params;
    }

方法二：返回Map<String, String[]>

    /**
     * 乱码解决，这段代码在出现乱码时使用
     * @param request
     * @return
     */
    public static Map<String, String[]> myGetRequestParamsMap(HttpServletRequest request) {
        Map<String, String[]> params = new HashMap<String, String[]>();
        Map requestParams = request.getParameterMap();
        for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext(); ) {
            String name = (String) iter.next();
            String[] values = (String[]) requestParams.get(name);
            String valueStr = "";
            String[] valueArr = new String[]{};
            for (int i = 0; i < values.length; i++) {
                valueStr = (i == values.length - 1) ? valueStr + values[i] : valueStr + values[i] + ",";
            }
            try {
                //将获取到的value值字符编码进行转换
                valueStr = new String(valueStr.getBytes("iso8859-1"), request.getCharacterEncoding());
//              System.out.println("request.getCharacterEncoding()-----"+request.getCharacterEncoding());
                //将转换后的拼接字符串拆分成数组
                valueArr = valueStr.split(",");
            } catch (Exception e) {
                logger.error("字符转化失败!", e);
            }
            params.put(name, valueArr);
        }
        return params;
    }