一、SpringMVC中的处理器
配置完SpringMVC的处理器映射器，处理适配器，视图解析器后，需要手动写处理器。关于处理器的写法有三种，无论怎么写，执行流程都是①处理映射器通过@Controller注解找到处理器，继而②通过@RequestMapping注解找到用户输入的url。下面分别介绍这三种方式。
package com.gql.springmvc;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
/**
* 类说明:
* 处理器的三种写法
* @guoqianliang1998.
*/
@Controller
public class UserController {
//1.SpringMVC开发方式
@RequestMapping("/hello")
public ModelAndView hello(){
ModelAndView mv = new ModelAndView();
mv.addObject("msg","hello world!");
mv.setViewName("index.jsp");
return mv;
}
//2.原生Servlet开发方式
@RequestMapping("xx")
public void xx(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException{
request.setAttribute("msg", "周冬雨");
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
//3.开发中常用
@RequestMapping("yy")
public String yy(Model model){
model.addAttribute("msg", "双笙");
return "forward:/index.jsp";//forward写不写都是转发,redirect代表重定向.
}
}
1.SpringMVC开发方式
@RequestMapping("/hello")
public ModelAndView hello(){
ModelAndView mv = new ModelAndView();
mv.addObject("msg","hello world!");
mv.setViewName("index.jsp");
return mv;
}
2.Servlet原生开发方式
@RequestMapping("xx")
public void xx(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException{
request.setAttribute("msg", "周冬雨");
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
3.开发中常用的方式
在return的字符串中，forward写不写都是代表转发，redirect则代表重定向。
@RequestMapping("yy")
public String yy(Model model){
model.addAttribute("msg", "双笙");
return "forward:/index.jsp";
}
