Spring MVC 重定向

package com.ssm.chapter15.controller;

import com.ssm.chapter15.pojo.Role;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
import org.springframework.web.servlet.view.json.MappingJackson2JsonView;

@Controller
@RequestMapping("/redirect")
public class RedirectController {

    @RequestMapping("/showRoleJsonInfo")
    public ModelAndView showRoleJsonInfo(Long id, String roleName, String note) {
        ModelAndView mv = new ModelAndView();
        mv.setView(new MappingJackson2JsonView());
        mv.addObject("id", id);
        mv.addObject("roleName", roleName);
        mv.addObject("note", note);
        return mv;
    }

    @RequestMapping("/addRole")
    //Model为重定向数据模型，Spring MVC会自动初始化它
    public String addRole(Model model, String roleName, String note) {
        // Role role = new Role();
        // role.setRoleName(roleName);
        // role.setNote(note);
        // 插入角色后，会回填角色编号
        // roleService.insertRole(role);
        // 绑定重定向数据模型
        model.addAttribute("roleName", roleName);
        model.addAttribute("note", note);
        // model.addAttribute("id", role.getId());
        return "redirect:./showRoleJsonInfo.do";
    }

    @RequestMapping("/addRole2")
    //ModelAndView对象Spring MVC会自定初始化它
    public ModelAndView addRole2(ModelAndView mv, String roleName, String note) {
        // Role role = new Role();
        // role.setRoleName(roleName);
        // role.setNote(note);
        //插入角色后，会回填角色编号
        // roleService.insertRole(role);
        //绑定重定向数据模型
        mv.addObject("roleName", roleName);
        mv.addObject("note", note);
        // mv.addObject("id", role.getId());
        mv.setViewName("redirect:./showRoleJsonInfo.do");
        return mv;
    }

    @RequestMapping("/showRoleJsonInfo2")
    public ModelAndView showRoleJsonInfo(Role role) {
        ModelAndView mv = new ModelAndView();
        mv.setView(new MappingJackson2JsonView());
        mv.addObject("role", role);
        return mv;
    }

    @RequestMapping("/addRole3")
    //RedirectAttribute对象Spring MVC会自动初始化它
    public String addRole3(RedirectAttributes ra, Role role) {
        //插入角色后，会回填角色编号
        // roleService.insertRole(role);
        // 绑定重定向数据模型
        ra.addFlashAttribute("role", role);
        return "redirect:./showRoleJsonInfo2.do";
    }

}