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Update SpringMVC_转发.md
Aug 15, 2018
3dbe699 · Aug 15, 2018

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SpringMVC_转发.md

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SpringMVC_转发

一、转发：reward:

  • 之前我们直接return其实就是转发 那么我们如何传参?

  • 传属性值

    • 原生api方式

    • springmvc推荐方式: Map|Model|ModelMap

    • springmvc推荐方式: 1.ModelAndView (模型+视图)

  • 推荐使用map 或者ModelAndView方式，而且以上方式属性都是放在了request域中

  • webapp/ceshi.jsp

      <%--
    Created by IntelliJ IDEA.
    User: sunny
    Date: 2018/8/13
    Time: 13:00
    To change this template use File | Settings | File Templates.
  --%>
  <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
  <head>
      <title>Title</title>
  </head>
  <body>
      request----- ${requestScope.name}
      <br>
      session----- ${sessionScope.name}
  </body>
  </html>

二、原生api方式

  • 1、不传参

    • ValueController.java

      @Controller
@RequestMapping("/value")
public class ValueController {
    @RequestMapping("/reward1")
    public String testReward1(HttpServletRequest request){
        request.setAttribute("name","小米");
        return "ceshi";
    }
}

    • 测试：

        http://localhost:8080/spring_mvc_demo2/value/reward1

    • 输出：

        request----- 小米
  session-----

  • 2、传参

    • ValueController.java

      @Controller
@RequestMapping("/value")
public class ValueController {
    @RequestMapping("/reward2")
    public String testReward2(String name, HttpServletRequest request){
        request.setAttribute("name", name);
        return "ceshi";
    }
}

    • 测试：

        http://localhost:8080/spring_mvc_demo2/value/reward2?name=小雅

    • 输出：

        request----- 小雅
  session-----

三、springmvc推荐方式之Map

  • ValueController.java

    @Controller
@RequestMapping("/value")
public class ValueController {
      @RequestMapping("/map")
      public String testMap(String name, Map<String,Object> map){
          map.put("name","小红");
          return "ceshi";
      } 
}

  • 测试：

      http://localhost:8080/spring_mvc_demo2/value/map

  • 输出：

      request----- 小红
  session----- 小红

四、springmvc推荐方式之Model

  • ValueController.java

    @Controller
@RequestMapping("/value")
public class ValueController {
      @RequestMapping("/model")
      public String testModel(String name, Model model){
          model.addAttribute("name",name);
          return "ceshi";
      }
}

  • 测试：

      http://localhost:8080/spring_mvc_demo2/value/model?name=小雷

  • 输出：

      request----- 小雷
  session----- 小雷

五、springmvc推荐方式之ModelMap

  • ValueController.java

    @Controller
@RequestMapping("/value")
public class ValueController {
      @RequestMapping("/modelMap")
      public String testModelMap(String name, ModelMap modelMap){
          modelMap.addAttribute("name",name);
          return "ceshi";
      }
}

  • 测试：

      http://localhost:8080/spring_mvc_demo2/value/modelMap?name=小花

  • 输出：

      request----- 小花 
  session----- 小花

六、springmvc推荐方式之ModelAndView

  • ValueController.java

    @Controller
@RequestMapping("/value")
public class ValueController {
      @RequestMapping("/modelAndView1")
      public ModelAndView testModelAndView1(String name,ModelAndView modelAndView){
          modelAndView.addObject("name",name);
          modelAndView.setViewName("ceshi");
          return modelAndView;
      }

      @RequestMapping("/modelAndView2")
      public ModelAndView testModelAndView2(String name){
          ModelAndView modelAndView = new ModelAndView();
          modelAndView.addObject("name",name);
          modelAndView.setViewName("ceshi");
          return modelAndView;
      }

      @RequestMapping("/modelAndView3")
      public ModelAndView testModelAndView3(String name){
          ModelAndView modelAndView = new ModelAndView("ceshi");
          modelAndView.addObject("name",name);
          return modelAndView;
      }
}

  • 测试：

      http://localhost:8080/spring_mvc_demo1/value/modelAndView1?name=小明
  
  http://localhost:8080/spring_mvc_demo2/value/modelAndView1?name=小风
  
  http://localhost:8080/spring_mvc_demo3/value/modelAndView1?name=小王

  • 输出：

      request----- 小明
  session----- 小明
  
  request----- 小风
  session----- 小风
  
  request----- 小王
  session----- 小王