尝试一（从AJAX请求上解决）：

可以显式设置contentType的编码为utf-8,后台一般都能正常解码例如：contentType: "application/x-www-form-urlencoded; charset=utf-8"

代码示例：

jQuery(form).ajaxSubmit({
                url: "doDepositApply.do",type: "post",dataType: "json",contentType: "application/x-www-form-urlencoded; charset=utf-8",success: function(response) {
                    if(response.success){
                        alert("充值申请已提交");
                        parent.jQuery.colorBox.close();
                    }else{
                        alert("充值申请提交失败："+response.message);
                    }
                }
            });