Spring 梳理-传递模型数据到视图

1. 传递model，返回string，不指定返回key

   1. package com.jt;
      import com.myOrg.DeptUserDomain;
      
      @Controller
      @RequestMapping(value="/FirstControl")
      public class HelloControl {
          @RequestMapping("/viewdud")
          public String viewDeptUser(Model model){
              DeptUserDomain dud=new DeptUserDomain();
              dud.setId("");
              dud.setName("zs");
              dud.setSalary();
              dud.setHireDate(new Date());
              model.addAttribute(dud);
              return "deptUser";
          }
      }

   2. 　

      <body>
      viewDeptUser<br>
      ${deptUserDomain.id}<br>
      </body>

2. 传递model，返回string，指定返回key

   1.        @RequestMapping("/viewdud")
          public String viewDeptUser(Model model){
              DeptUserDomain dud=new DeptUserDomain();
              dud.setId("");
              dud.setName("zs");
              dud.setSalary();
              dud.setHireDate(new Date());
              model.addAttribute("data",dud);
      
              return "deptUser";
          }

   2. <body>
      viewDeptUser<br>
      ${data.id}<br>
      </body>

3. 传递map，返回string，必须指定返回key。（可避免被Spring类型的Model污染代码）

   1.     @RequestMapping("viewdudByMap")
          public String viewDeptUserByMap(Map map){
              DeptUserDomain dud=new DeptUserDomain();
              dud.setId("");
              dud.setName("zs");
              dud.setSalary();
              map.put("dataByMap",dud);
              return "deptUser";
          }

      <body>
      viewDeptUser<br>
      ${dataByMap.id}<br>
      </body>

      　　

4. 传递空，返回data

   1. @Controller
      @RequestMapping(value="/FirstControl")
      public class HelloControl {
       @RequestMapping("/viewdudByReturn")
       public DeptUserDomain viewDeptUserByReturn(){
        DeptUserDomain dud=new DeptUserDomain();
        dud.setId("1");
        dud.setName("zs");
        dud.setSalary(10000);
        return dud;
       }
      }

       系统自动根据请求路径进行推断设置，视图名称为viewdudByReturn,jsp路径为 /WEB-INF/FirstControl/viewdudByReturn.jsp ，
      相当于返回的String为“/FirstControl/viewdudByReturn”
      <body>
      viewDeptUser<br>
      ${deptUserDomain.id}<br>
      </body>