B K*_*B K 1 java spring jsp controller spring-mvc
我想在重定向后将数据传递到视图。例如,我按下一个按钮,它会将我重定向到包含来自控制器的数据的页面。我正在尝试使用每个人都建议的 RedirectAttribute,但我无法让它工作。任何帮助表示赞赏。
索引.jsp:
<a href="user.htm">Display All Users</a>
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控制器:
@RequestMapping(value = "/user.htm")
public ModelAndView addUser(RedirectAttributes redirAtt) {
ModelAndView mv = new ModelAndView("redirect:user");
String out = "All User Details: ";
try {
Session session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
List result = session.createQuery("from Users").list();
mv.addObject("users", result);
session.getTransaction().commit();
} catch (Exception e) {
e.printStackTrace();
}
redirAtt.addFlashAttribute("message", out);
return mv;
}
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我想要在上面显示数据的jsp:user.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>${message}</title>
</head>
<body>
<h1>${message}</h1><br>
<table>
<tr>
<th>Username</th>
<th>Nickname</th>
<th>Email</th>
<th>Password</th>
</tr>
<c:forEach items="${users}" var="user">
<tr>
<td><c:out value="${user.username}"/></td>
<td><c:out value="${user.nickname}"/></td>
<td><c:out value="${user.email}"/></td>
<td><c:out value="${user.password}"/></td>
</tr>
</c:forEach>
</table>
</body>
</html>
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页面重定向时不显示任何数据。
我也这样做了我的控制器:
@RequestMapping(value = "/test.htm")
public String addUser(RedirectAttributes redirectAttributes) {
String out = "All User Details: ";
try {
Session session = HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
List result = session.createQuery("from Users").list();
session.getTransaction().commit();
redirectAttributes.addAttribute("message", "testing testing tesing");
} catch (Exception e) {
e.printStackTrace();
}
return "redirect:/user.jsp";
}
@RequestMapping(value = "/user.jsp")
public ModelAndView test(@ModelAttribute("message") String myMessage) {
ModelAndView mv = new ModelAndView("user");
mv.addObject("message", myMessage);
return mv;
}
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当我尝试这个时,重定向的网址是:
http://localhost:8080/projname/user.jsp?message=testing+testing+tesing
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所以我认为属性正在被传递,但也许我输出错误?
小智 5
处理重定向属性有三种可能性
我在以下 get 方法中组合了三种可能性。
@GetMapping("/redirectme")
public RedirectView redirectme(final RedirectAttributes redirectAttributes) {
// the following attribute is a ModelAttribute
redirectAttributes.addFlashAttribute("messageA", "A");
final RedirectView redirectView = new RedirectView("/redirectedpage", true);
// the following attributes are request-parameter (dynamic Attributes)
redirectAttributes.addAttribute("messageB", "B");
redirectView.getAttributesMap().put("messageC", "C");
return redirectView;
}
@GetMapping("/redirectedpage")
public ModelAndView redirectedPage(
// access FlashAttributes
final Model model, @ModelAttribute("messageA") final String messageA,
// access 'dynamic' Attributes
@RequestParam("messageB") final String messageB, @RequestParam("messageC") final String messageC) {
final ModelAndView modelAndView = new ModelAndView("red");
modelAndView.addObject("caption", "App");
// access FlashAttributes
modelAndView.addObject("messageA_1", model.asMap().get("messageA"));
modelAndView.addObject("messageA_2", messageA);
// access 'dynamic' Attributes
modelAndView.addObject("messageB", messageB);
modelAndView.addObject("messageC", messageC);
return modelAndView;
}
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