JSP页面获取ModelAndView传递的参数

柔情只为你懂 2022-04-15 05:54 524阅读 0赞

**后端代码**

实体

package com.ctrip.train.tieyouflightpriceanalysis.entity;
    
    /**
     * desc : 优惠券信息
     * create_user : cheng
     * create_date : 2018/11/21 14:33
     */
    public class CouponInfo {
    
        /**
         * 策略ID
         */
        private String activityId;
        /**
         * 描述信息
         */
        private String desc;
    
        /**
         * desc : 重写toString, 这个方法一定要重写, 重写的内容就是json格式化出来的内容
         * create_user : cheng
         * create_date : 2018/11/21 16:06
         */
        @Override
        public String toString() {
            return activityId + ":"+ desc;
        }
    
        public String getActivityId() {
            return activityId;
        }
    
        public void setActivityId(String activityId) {
            this.activityId = activityId;
        }
    
        public String getDesc() {
            return desc;
        }
    
        public void setDesc(String desc) {
            this.desc = desc;
        }
    }

controller

/**
         * desc : 跳转优惠券风险控制报表页面
         * create_user : cheng
         * create_date : 2018/8/14 16:29
         */
        @RequestMapping(value = "/_riskControl")
        public ModelAndView toRiskControl(ModelAndView mv) throws Exception {
            mv.setViewName("coupon/riskControl");
            // 优惠券策略ID list(依据class的toString方法生成json)
            // 其中的getCouponList方法 : List<CouponInfo> getCouponList() throws Exception;
            mv.addObject("couponList", riskControlBiz.getCouponList());
            return mv;
        }

前端jsp页面获取

js处理数据

/**
         * 填充优惠券策略ID
         */
        function fillCouponEnum() {
            // 获取优惠券策略ID, 截取前后[]
            var couponStr = $("#couponList").val();
            
            // 输出结果 : [63336:新客券, 63341:63341, 81635:81635, 65145:65145, 81636:81636, 65157:65157, 75125:75125, 81639:81639, 71653:71653, 65152:65152, 81640:81640, 73039:73039, 67012:67012, 67928:67928, 75126:75126, 73040:73040, 78657:78657, 65148:65148, 81641:81641, 67015:67015, 71657:71657, 65153:65153, 71658:71658, 76608:76608, 77151:77151, 67929:67929]
            // 其实就是 activityId + ":"+ desc, 也就是实体类的toString方法
            console.log(couponStr);
    
            couponStr = couponStr.substring(1, couponStr.length - 1);
            // str -> array
            var couponList = couponStr.split(",");
            var selectHtml = "<optgroup>";
            selectHtml += "<option data-subtext='全部' value=' '>全部</option>";
            for (var i = 0; i < couponList.length; i++) {
                var couponArr = couponList[i].split(":");
                selectHtml += "<option data-subtext='" + couponArr[1] + "' value='" + couponArr[0] + "'>" + couponArr[0] + "</option>";
            }
            selectHtml += "</optgroup>";
            $("#couponEnum").append(selectHtml);
        }

**特别注意**  
我们注释掉实体类的toString方法后, 上述console.log(couponStr)打印结果为

[com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@c6c31f9, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@61e7aa09, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@4b55c1eb, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@4ef4b604, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@23fab5da, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@7f91e44e, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@1a2e38ce, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@7101e919, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@7a3d686, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@7760e1a8, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@1ce35fc2, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@62d42466, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@7b5ac95c, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@bc70a3e, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@d5c49cb, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@4ee8ab12, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@63559bba, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@5070eb14, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@3f8de2c0, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@34367e18, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@7bf1ab6f, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@2c0ed74e, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@7c45abed, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@7b84ccc3, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@d58aa0f, com.ctrip.train.tieyouflightpriceanalysis.entity.CouponInfo@57b6a84d]