为了解决乱码问题，在web.xml中定义的过滤器ContextLoaderListener只适用于servlet的dopost方法，而对doget方法不适用。

这里提供一种思路可以参考：

if (req.getMethod().equals("POST")) {
                        while (tEnumer.hasMoreElements()) {
                                String tStr = (String) tEnumer.nextElement();
                                // log.info(tStr + "-[" + req.getParameter(tStr) + "]");
                                paramsUtil.put(tStr, req.getParameter(tStr));
                        }
                } else if (req.getMethod().equals("GET")) {
                        //get方法不支持web.xml中的过滤器配置
                        while (tEnumer.hasMoreElements()) {
                                String tStr = (String) tEnumer.nextElement();
                               
                                try {
                                        paramsUtil.put(tStr, new String(req.getParameter(tStr).getBytes("ISO-8859-1"), "UTF-8"));
                                } catch (UnsupportedEncodingException e) {
                                        log.debug("",e);
                                }
                        }
                }