SpringMVC
跳转1.转发2.重定向3.跳转细节
传值1.Request和Session2.JSP中取值3.Model4.ModelAndView5.@SessionAttributes和SessionStatus
跳转
跳转关键字 forward: redirect:
1.转发
@Controller
@RequestMapping("/jump")
public class ForwardController {
@RequestMapping("/test1")
public String
test1(){
System
.out
.println("test1");
return "forward:/hello.jsp";
}
@RequestMapping("/test2")
public String
test2(){
System
.out
.println("test2");
return "forward:/jump/test1";
}
@RequestMapping("/test3")
public String
test3(){
System
.out
.println("test3");
return "forward:test1";
}
2.重定向
@RequestMapping("/test4")
public String
test4(){
System
.out
.println("test4");
return "redirect:/hello.jsp";
}
@RequestMapping("/test5")
public String
test5(){
System
.out
.println("test5");
return "redirect:/jump/test4";
}
@RequestMapping("/test6")
public String
test6(){
System
.out
.println("test6");
return "redirect:test4";
}
3.跳转细节
1.增删改操作，为了防止请求重复提交，选择重定向redirect2.查询操作，选择转发Forward
传值
1.Request和Session
public class DataController {
@RequestMapping("/test1")
public String
test1(HttpServletRequest httpServletRequest
, HttpSession httpSession
){
System
.out
.println("test1");
httpServletRequest
.setAttribute("name","张三");
httpSession
.setAttribute("age","23");
return "data";
}
2.JSP中取值
在jsp用EL表达式，取值就可以 requestScope sessionScope
<%@ page contentType
="text/html;charset=UTF-8" language
="java" %>
<html>
<head>
<title>Title
</title
>
</head
>
<body>
name
:$
{requestScope
.name
}<br>
age
:$
{sessionScope
.age
}<br>
name
:$
{requestScope
.name
}
</body
>
</html
>
3.Model
@RequestMapping("/test2")
public String
test2(Model model
){
System
.out
.println("test2");
model
.addAttribute("name","李四");
return "data";
}
4.ModelAndView
@RequestMapping("/test4")
public ModelAndView
test4(){
ModelAndView modelAndView
=new ModelAndView();
modelAndView
.setViewName("forward:/hello.jsp");
modelAndView
.addObject("claz","123");
return modelAndView
;
}
5.@SessionAttributes和SessionStatus
@SessionAttributes(names = {“city”,“street”}) model中的city，street数据会存入session
@RequestMapping("/test5")
public String
test5(Model model
){
model
.addAttribute("city","南京");
model
.addAttribute("street","123");
return "data";
}
SessionStatus
@RequestMapping("/test3")
public String
test3(SessionStatus sessionStatus
){
sessionStatus
.setComplete();;
return "data";
}
