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SpringMVC_servlet原生api作为参数.md

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SpringMVC_servlet原生api作为参数

一、MVC的handler方法可以接受ServletAPI类型作为参数

  • ServletAPI

    • HttpServletRequest

    • HttpServletRespons

    • HttpSession

    • InputStream

    • OutputStream

    • Reader

    • Outer

    参数上直接写，就可以直接使用

  • 实例

    • 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>

    • ValueController.java

      @Controller
@RequestMapping("/value")
public class ValueController {
      @RequestMapping("/session")
      public String testHttpSession(String name, Map map, HttpSession session){
          map.put("name",name);
          session.setAttribute("name",name);
          return "ceshi";
      }
}

    • 测试：

        http://localhost:8080/spring_mvc_demo2/value/session?name=小红

    • 输出：

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

二、@SessionAttribute

  • @SessionAttribute使用简介

    • @SessionAttribute只能放在类上

    • 它有两个属性 value type

      • @SessionAttributes(value= {"gender"},types= {String.class})

  • 实例

    • 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----- ${requestScope.name}--${requestScope.age}--${requestScope.gender}
    <br>
    session----- ${sessionScope.name}--${sessionScope.age}--${sessionScope.gender}
</body>
</html>

    • ValueController.java

      @SessionAttributes
//@SessionAttributes(types = {String.class})
//@SessionAttributes(value= {"gender","name","age"},types= {String.class,String.class,Integer.class})
@RequestMapping("/value")
@Controller
public class ValueController {
    @RequestMapping("/sessionAttribute")
    public String testSessionAttribute(String name,Map map){
        map.put("name",name);
        map.put("gender","男");
        map.put("age",20);
        return "ceshi";
    }
}

    • 测试：

        http://localhost:8080/spring_mvc_demo2/value/sessionAttribute?name=小培

    • 输出：

      • @SessionAttributes

        request----- 小培--20--男 
session----- ----

      • @SessionAttributes(types = {String.class})

        request----- 小培--20--男 
session----- 小培----男

      • @SessionAttributes(value= {"gender","name","age"},types= {String.class,String.class,Integer.class})

        request----- 小培--20--男 
session----- 小培--20--男