SpringMVC-前段后台传递数据

@Controller
public class DataController {
    
    //一、接收和通过ModelMap传出参数,不需要视图解析器,测试时加了解析器，顾返回值不需后缀
    //普通参数
    @RequestMapping("/data1")
    public String data1(@RequestParam("uname")String name,ModelMap mm){
        //接收数据
        //1.页面提交的表单域名和参数名需相同
        //2.非要与提交的表单域名不一样的时候，如上加@RequestParam("uname")，但提交的表单域名名必须和uname相同
//        System.out.println(name);
        
        //传递数据到页面，添加ModelMap mm，类似request.setAttribute()
        mm.addAttribute("uname", name);
        return "data";
    }
    
    //对象参数
    @RequestMapping("/data2")
    public String data2(User user,ModelMap mm){
        //接收数据
        //提交的表单域名需和对象里的属性名一致
//        System.out.println(user);
        
        //传递数据到页面，添加ModelMap mm，类似request.setAttribute()
        mm.addAttribute("user", user);
        
        return "data";
    }
    
    //二、接收和通过ModelAndView传出参数,需要配置视图解析器
    @RequestMapping("/data3")
    public ModelAndView data3(HttpServletRequest req,HttpServletResponse resp){
        ModelAndView mv = new ModelAndView();
        User user = new User();
        //接收数据
        user.setName(req.getParameter("name"));
        user.setPassword(req.getParameter("password"));
        //传递数据
        req.setAttribute("uname", user.getName());
        req.setAttribute("user", user);
        mv.setViewName("data");
        return mv;
    }
}

　　<mvc:annotation-driven />
    <!-- viewResolver -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <!-- 视图解析类型 -->
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <!-- 设置前缀 -->
        <property name="prefix" value="/"/>
        <!-- 设置后缀 -->
        <property name="suffix" value=".jsp"/>
    </bean>
       
    <context:component-scan base-package="com.xhx.controller" />