客户端给服务器端传递值，服务器端如何获取？    

1）request

http://localhost:8080/SpringMVC/test02?name=tony&age=8

如果传递多个参数，直接定义为数组即可，参数名和方法形参保持一致

如果页面传递的参数名和值与形参不一致怎么办

@RequestMapping("/test04")
    public String test04(@RequestParam("username") String name, @RequestParam("password") String pwd){
        System.out.println("name："+name+",password："+pwd);
        return "hello";
    }
}

  2)传递值的参数名和方法的形参名字保持一致

 

@RequestMapping("/test02")
public String test02(String name,Integer age){
    System.out.println("name："+name+",age："+age);
    return "hello";
}

数据共享：

    服务器给客户端传递值

通过 HttpServletRequest 接收请求参数适用于 get 和 post 提交请求方式，示例代码如下:

@RequestMapping("/getval01")
public  String getVal01(HttpServletRequest request){
    request.setAttribute("name","tony");
    request.setAttribute("dept",new Dept("测试部",100,"测试相关工资"));
    return "getValue";
}

通过 ModelAndView

@RequestMapping("/getval02")
public ModelAndView getVal02(HttpSession session){
    ModelAndView mv=new ModelAndView();
    mv.addObject("name","jerry");
    mv.addObject("dept",new Dept("人事部",10,"招聘"));
    mv.setViewName("getValue");
    session.setAttribute("name","session2");
    return mv;
}

其他方式：

@RequestMapping("/getval03")
public String getval03(Model model){
    model.addAttribute("name","model");
    return "getValue";
}
@RequestMapping("/getval04")
public String getval04(Map<String,Object>map){
    map.put("name","map");
    return "getValue";
}
//全部赋值在request作用域
@RequestMapping("/getval05")
public String getval04(ModelMap modelMap){
    modelMap.addAttribute("name","modelMap");
    return "getValue";
}