@SessionAttributes,@ModelAttribute

1.@SessionAttributes允许我们有选择地指定Model中的哪些属性需要转存到HttpSession对象当中

package com.game.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;

import com.game.model.User;

@Controller
@SessionAttributes("user")
public class SessionAttributesController {

    @RequestMapping(value="/{formName}")
    public String loginForm(@PathVariable String formName)
    {
        return formName;//动态页面的跳转，可以是任何页面
    }
    
    @RequestMapping(value="/login2")
    public String loing(@RequestParam("loginId") String loginId,@RequestParam("password") String password,Model model)
    {
        User user = new User();
        user.setLoginId(loginId);
        user.setPassword(password);
        user.setUserName("admin");
        model.addAttribute("user", user);
        return "welcome2";
    }
    
}
  <body>
  <h3>测试@SessionAttributes注解</h3>
  <br>
  <form action="login2" method="post">
      <table>
          <tr>
              <td><label>登录名：</label></td>
              <td><input type="text" id="loginId" name="loginId"></td>
          </tr>
          <tr>
              <td><label>密码：</label></td>
              <td><input type="password" id="password" name="password"></td>
          </tr>
          <tr><td><input id="submit" type="submit" value="登录"></td></tr>
      </table>
  </form>
  </body>
<body>
    ${ requestScope.user.userName }<br>
    ${ sessionScope.user.userName }
  </body>

 

2.@ModelAttributes将请求参数绑定到Model对象

只支持一个属性value，表示绑定的属性名称

被@ModelAttributes注解的方法会在Controller每个方法执行前被调用

 

<body>
    <h3>@ModelAttributes注解测试</h3>
    <a href="loginForm1">@ModelAttributes(value="")注释返回具体类的方法</a><br>
    <a href="loginForm1">@ModelAttributes注释void返回值的方法</a><br>
    <a href="loginForm1">@ModelAttributes注释返回具体类的方法</a><br>
    <a href="loginForm1">@ModelAttributes和@RequestMapping同时注释一个方法</a><br>
    <a href="loginForm1">@ModelAttributes注释一个方法的参数</a><br>
  </body>

 

 

package com.game.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class ModelAttributes1Controller {

    //设置了一个logidI到Model当中，然后@requestScope。loginId就可以取到，指定了model属性的名称，方法的返回值就是属性的值
    @ModelAttribute("loginId")
    public String userModel1(@RequestParam("loginId") String loginId)
    {
        return loginId;
    }
    
    @RequestMapping("/login11")
    public String login1()
    {
        return "result1";
    }
    
}
package com.game.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class ModelAttributes2Controller {

    @ModelAttribute
    public void userModel1(@RequestParam("loginId") String loginId,Model model)
    {
        model.addAttribute("loginId", loginId);
    }
    
    @RequestMapping("/login22")
    public String login1()
    {
        return "result1";
    }
    
}

其它几种方式大同小异，不一一列举了

posted @ 2017-06-14 01:15  腾飞新星  阅读(382)  评论(0)  编辑  收藏  举报