spring mvc表单自动装入实体对象

      <form action="/springmvc1/user/add" method="post">
          id:   <input type="text" name="id"><br>
        姓名：<input type="text" name="name"/><br>
        密码：<input type="text" name="password"/><br>
        地址：<input type="text" name="address"/><br>
        <input type="submit"/>
    </form>    

public class User {
    private int id;
    private String name;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

}

    @RequestMapping(value="add", method=RequestMethod.POST, produces="text/html;charset=UTF-8")
    @ResponseBody
    public String addUser2(User user,String password, String address){
        //return request.getParameter("username")+request.getParameter("password")+request.getParameter("address");
        return user.getName()+user.getId()+password+address;
    }