SpringMVC中的Controller方法的（返回值/参数类型）

@RequestMapping("/getUser.action")
    public ModelAndView  getUser(@RequestParam(name="userId",required = true)Integer id) throws Exception{
        System.out.println("id="+id);
        ModelAndView modelAndView = new ModelAndView();
        User user = userService.queryOne(id);
        modelAndView.addObject("user", user);
        modelAndView.setViewName("userinfo");
        return modelAndView;
    }

@RequestMapping("/index.action")
    public String  toIndex() {
    return "index";    

@RequestMapping("/index.action")
public String  toIndex() {
    //重定向到index.jsp,  完整的路径
    return "redirect:/jsp/index.jsp";

@RequestMapping("/index.action")
public String  toIndex() {
    return "redirect:/user/getUser.action?userId=2";

//使用Servlet API 对象
    @RequestMapping("/fun2.action")
    public  String  fun2(HttpServletRequest request, HttpServletResponse response, HttpSession session) {
        System.out.println("fun2().....");
        request.setAttribute("hello", "request_hello");
        session.setAttribute("hello", "session_hello");
        Cookie cookie = new  Cookie("haha","xixi");
        //把cookie保存客户端
        response.addCookie(cookie);
        return "hello";
    }

//推荐写法
    @RequestMapping("/fun3.action")
    public  String  fun3(Model model) {
        System.out.println("fun3().....");
        // SpringMVC 框架帮我们把model中的数据, 一个一个添加到request域
        // Model 不能替换Request对象, 
        model.addAttribute("hello","model_hello");
        model.addAttribute("xx", 123);
        return "hello";
    }

@RequestMapping(value="/addUser.action",method=RequestMethod.POST)
    public  String  addUser(User user,Model model) {
        userService.saveUser(user);
        model.addAttribute("msg", "添加成功");
        return "msg";
    }

@DateTimeFormat(pattern = "yyyy-MM-dd")
private Date brithday;

public class MyDateConverter  implements Converter{
    private SimpleDateFormat  sdf = new SimpleDateFormat("yyyy-MM-dd");
    //转换的方法
    @Override
    public Date convert(String source) {
        try {
            return sdf.parse(source);
        } catch (ParseException e) {
            e.printStackTrace();
            throw new RuntimeException("日期格式不对,日期格式:yyyy-MM-dd");
        }
    }
}

    class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
        class="spring09.converter.MyDateConverter"/>
                
            

//批量添加    @RequestMapping(value="/bathAddUser.action",method=RequestMethod.POST)
    public  String  bathAddUser(UserVo userVo,Model model) {
        model.addAttribute("msg", "添加成功");
        return "msg";
    }

public class UserVo {
    private List users = new ArrayList();
    public List getUsers() {
        return users;
    }
    public void setUsers(List users) {
        this.users = users;
    }