HttpClient I/O exception,该如何解决

HttpClient client = new HttpClient();        PostMethod postMethod = new PostMethod("http://122.22.22.2:2222/Object/HrTms.do");        postMethod.setRequestHeader("Content-type",                "application/x-www-form-urlencoded; charset=UTF-8");        // 泛型List -> Json        java.lang.reflect.Type type = new com.google.gson.reflect.TypeToken<List<Tab_User>>() {        }.getType();        String json = gson.toJson(pageList, type);        _log.debug(serviceUrl + "发送 Hr Json:" + json);        postMethod.setRequestBody(new NameValuePair[] {                new NameValuePair("Type", "Hr"),                new NameValuePair("data", json)                 });        int status = 0;