Java Spring MVC在同一个JSP中获取/发布
发布时间:2020-12-15 00:40:23 所属栏目:Java 来源:网络整理
导读:这是我的控制器.. @RequestMapping(value = "/add",method = RequestMethod.GET)public String add(Model model) { return "add";}@RequestMapping(value = "/add",method = RequestMethod.POST)public String added(@RequestParam("name") String name,Mode
这是我的控制器..
@RequestMapping(value = "/add",method = RequestMethod.GET) public String add(Model model) { return "add"; } @RequestMapping(value = "/add",method = RequestMethod.POST) public String added(@RequestParam("name") String name,Model model) { City city = new City(); city.setCity(name); service.addCity(city); return "add"; } 这是我的JSP视图..这只是为了添加…这是add.jsp..so它回发给自己 <form method="post" action="/spring/krams/edit/add"> Linna nimi <input type="text" name="name"> <input type="submit" value="Test" name="submit" /> </form> 我希望JSP文件发生变化,以便当我将其发布到此文件时,它会说…“添加了城市”.那可能吗? 什么关于更新城市? @RequestMapping(value = "/update",method = RequestMethod.POST) public String updated(@RequestParam("city") int city_id,@RequestParam("text") String name,Model model) { service.updateCity(name,city_id); return "update"; } 这里没有对象? 解决方法
在post方法中,您可以使用addAttribute方法添加属性
@RequestMapping(value = "/add",Model model) { City city = new City(); city.setCity(name); service.addCity(city); model.addAttribute("city",city); return "add"; } 在JSP中,您可以检查属性city是否为null(标记为< c:if />).如果它不是null,那是因为它刚刚被添加到模型中,所以你可以显示你想要的任何东西. ${city.city}它只是一个JSTL表达式,它访问city属性,然后调用getter来访问该属性的city属性: <%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c" %> <c:if test="${city != null}"> CITY <c:out value="${city.city}" /> ADDED </c:if> UPDATE 如果根据更新/创建操作需要不同的消息,则可以执行以下操作:(在示例中,当id param不为null时进行更新,因为id是要更新的城市的标识符) @RequestMapping(value = "/add",method = RequestMethod.POST) public String added(@RequestParam(value="id",required=false) String id,@RequestParam("name") String name,Model model) { City city; String operation; if(id== null){ //create operation city = new City(); operation = "CREATE"; }else{ //update operation city = service.findCity(id); operation = "UPDATE"; } city.setCity(name); service.saveCity(city); //save or update model.addAttribute("city",city); model.addAttribute("operation",operation); //add operation param return "add"; } 在JSP中你可以做到: <%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c" %> <c:if test="${operation == 'CREATE'}"> <c:if test="${city != null}"> CITY <c:out value="${city.city}" /> ADDED </c:if> <c:if test="${operation == 'UPDATE'}"> CITY <c:out value="${city.city}" /> UPDATED </c:if> </c:if> (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |