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);
}
}
});