首先看一下如何获得request对象、session对象:
普通的Controller类,示例代码如下:
@Controller
@RequestMapping(value = "user")
public class UserController { @RequestMapping(value = "/reg2")
public String reg2(String uname,HttpServletRequest req,ModelMap map){
req.setAttribute("a", "aa");
req.getSession().setAttribute("b", "bb");
return "index";
}
}
ModelMap:
是map的实现,可以在其中存放属性,作用域同request。下面这个示例,我们可以在modelMap中放入数据,然后在forward的页面上显示这些数据。
通过el表达式、JSTL、java代码均可。
代码如下:
package com.sxt.web; import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController; @Controller
@RequestMapping(value = "user")
public class UserController extends MultiActionController { @RequestMapping(value = "/reg")
public String reg(String uname,ModelMap map){
map.put("a", "aaa");
return "index";
}
}
JSP页面:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head></head>
<body>
<h1>${requestScope.a}</h1>
<c:out value="${requestScope.a}"></c:out>
</body>
</html>
请求转发和重定向:
package com.sxt.web; import javax.annotation.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.SessionAttributes; @Controller
@RequestMapping(value = "user")
public class UserController { @RequestMapping(value = "/reg4")
public String reg4(ModelMap map) {
System.out.println("HelloController.handleRequest()");
// return "forward:index.jsp";
// return "forward:user.do?method=reg5"; //转发
// return "redirect:user.do?method=reg5"; //重定向
return "redirect:http://www.baidu.com"; //重定向
} @RequestMapping(value = "/reg5")
public String reg5(@RequestParam("uname") String uname,ModelMap map) {
System.out.println("HelloController.handleRequest()");
System.out.println(uname);
return "index";
} }
这样如果是请求转发(forward)的话传值可以用request和modelMap传递。