package com.ruide.action;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import org.springframework.http.HttpRequest;
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.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import com.ruide.po.User;
//让spring管理类
@Controller
public class TestAction {
//设置请求路径
@RequestMapping(value="/hello.do")
public String say(){
System.out.println("Hello World");
//return "index";//默认请求转发
return "redirect:/index.jsp";
}
/*
* ----------------------如何从页面里获取值----------------------
*
* */
//方法1:使用request接受参数
@RequestMapping("/login.do")
public String login(HttpServletRequest request){
String username=request.getParameter("username");
String userpass=request.getParameter("userpass");
System.out.println(username+userpass);
return null;
}
//方法2:直接通过注解在参数中获取值
@RequestMapping("/login.do")
public String login(@RequestParam("username") String username,
@RequestParam("userpass") String userpass){
System.out.println(username+" "+userpass);
return null;
}
//方法3:通过对象来接受值(该方法需要控件name与对象属性一致)
@RequestMapping("/login.do")
public String login(User user){
System.out.println(user.getUsername()+" "+user.getUserpass());
return null;
}
//方法4:通过与控件name同名的变量接受值
@RequestMapping("/login.do")
public String login(String username,String userpass){
System.out.println(userpass+" "+username);
return "index";
}
/*
* ----------------------如何把值传递到页面----------------------
*
* */
//方法1:通过request把值传递到页面
@RequestMapping("/login.do")
public String login(User user,HttpServletRequest request){
request.setAttribute("username",user.getUsername());
request.setAttribute("userpass", user.getUserpass());
return "index";
}
//方法2:通过框架自带的modelmap集合传递到页面
@RequestMapping("/login.do")
public String login(User user,ModelMap mm){
mm.put("username", user.getUsername());
mm.put("userpass", user.getUserpass());
return "index";
}
//方法3:通过框架自带的model and view传递值(常用)
@RequestMapping("/login.do")
public ModelAndView login(User user){
//把值放入一个键值对中
// Map<String,String> model=new HashMap<String,String>();
// model.put("username", user.getUsername());
// ModelAndView mv=new ModelAndView("index",model);
//把对象直接放入键值对中
ModelAndView mv=new ModelAndView();
mv.addObject("user",user);
//设置要转发的页面
mv.setViewName("index");
return mv;
}
//方法4:通过注解传递值(注解中的名字会被赋值)
//注意:注解过的方法会在整个action接受到请求时最先执行(不推荐使用)
@ModelAttribute("name")
public String getName(){
return "haha";
}
}