web前端——前端页面与后台controller实现前端后台交互

前端jsp页面：
<td>
<a href="${ctx}/goods/del/${goodItem.id};" type="submit" >删除</a>
</td>

后台controller:
@RequestMapping("/del/{gid}")
public String del(@PathVariable("gid")long gid, Model model){
if(String.valueOf(gid)!=null &&String.valueOf(gid)!=""){
System.out.println("gid"+gid);
goodsService.del(gid);
}
else{
System.out.print("controller del gid为空");
}
List<Goods> goodsList=goodsService.findAll();
model.addAttribute("goodsList",goodsList);
return "redirect:/goods/list"; //重定向
}