struts1 下的 jquery ajax 记录

JS 代码

function checkInternalTransaction(actionType,idNum) {
    var url = "/sales/checkInternalTransaction.do";
    var checkMsg;
   $.ajax({
       type : 'post',
       dataType : "text",
       url : url,      
       data : "actionType="+actionType+"&idNum="+idNum,
       cache : false,
       async : false,
       success : function(msg) {
           checkMsg = msg;  //msg 即前台返回的值，默认字符串类型，后台返回了 true 前台接收到的是字符串 "true"
       }
   })
   return  checkMsg;
}

struts1 配置

<action path="/checkInternalTransaction" type="com.sinosoft.sales.ui.control.facade.UIInternalTransactionFacade"
    name="fm" scope="request">
</action>

后台代码

public class UIInternalTransactionFacade  extends Action{
    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        DBInternalTransaction DBInternalTransaction = new DBInternalTransaction();
        boolean resultBoolean = true;
        String actionType = request.getParameter("actionType");
        String idNum = request.getParameter("idNum");
        if(null==idNum||"".equals(idNum)){
            response.getWriter().print(true); //直接调用该方法想前台返回值
            return null;
        }
        if(actionType.equals("IDV")){
            int count = DBInternalTransaction.checkIdvIdNum(idNum);
            resultBoolean = count==0?true:false; //未查询到数据，则校验通过，查询到数据则在页面弹出提示。
        }
        if(actionType.equals("UNIT")){
            int count = DBInternalTransaction.checkUnitIdNum(idNum);
            resultBoolean = count==0?true:false; //未查询到数据，则校验通过，查询到数据则在页面弹出提示。
        }
        response.getWriter().print(resultBoolean);
        return null; //不需要跳转，返回null
    }
}