jsp下实现遍历集合

╰+攻爆jí腚メ 2022-05-22 01:46 165阅读 0赞

Caused by: javax.servlet.jsp.JspTagException: Don't know how to iterate over supplied "items" in <forEach>

这里给的就是不是不能遍历items对象,因为items压根就不是集合..所以改为集合就可以了

<div class="form-group">
        <label for="couponType" class="col-md-3 control-label">会员等级</label>
        <div class="col-md-9">
            <form:select path="accountId" cssClass="form-control">
                <form:option value="red">=======默认所有会员======</form:option>
                <c:forEach items="${ memberranks}" var="memberrank">
                    <form:option value="${ memberrank.id}">${ memberrank.name}</form:option>
                </c:forEach>
            </form:select>
        </div>
    </div>

在一个form中进行给的

![70][]

后台代码是:

@RequestMapping("{type}")
    public ModelAndView editPage(@PathVariable String type, Long id, Long menuid) {
        ModelAndView mv = new ModelAndView("coupon/coupon/editpage");
        Coupon coupon = new Coupon();
        if ("editpage".equals(type)) {
            coupon = couponService.selectByKey(id);
        }
        ResultList<Memberrank> memberranks = memberrankService.select(null, null, null, null);
        mv.addObject("coupon", coupon);
        mv.addObject("type", type);
        mv.addObject("memberranks",memberranks);
        mv.addObject(SysStaticParam._MENUID_NAME, menuid);
        return mv;
    }

前台是可以获取到memberrank的值的,但是发现是一个对象,不是简单的list集合,这就是问题所在,我把list封装到一个ResultList对象中了.所以就出现这种情况了...

我将封装的memberrank保存为list对象的时候,就没有问题了.

![70 1][]

还是老老实实来吧...

[70]: /images/20220522/7ea1b64bf21a4682a0826c9d9dbdec73.png
[70 1]: /images/20220522/c42b2732c93b40698f33b4357346ea64.png