Spring 3 Form 的處理

在 Spring 3 中, html Form 的傳接值可以使用下面幾種方式處理.



1. Automatic model binding

    1.1 先建立Model object, ex: UserProfile

    1.2 Form的欄位名稱要跟Model欄位名稱相同.
    ex: <form method="POST"><input name="userName" type="text" /></form>

    1.3 Controller的寫法如下：

    @RequestMapping(method=RequestMethod.POST)    public ModelAndView processSubmit(UserProfile user ) {        System.out.println(user.getUserName()) ;
        //以下程式供回傳用        ModelAndView mav = new ModelAndView("successView") ;        mav.addObject("user", user) ;        return mav ;    }

    1.4 View中呈現Controller回傳值的方式為：<c:out value="${user.userName}">或直接寫${user.userName}寫也可以.


2. Request Parameter

    2.1 Controller的寫法如下：(Form為<form method="POST"><input name="userName" type="text" /></form>)

@RequestMapping(method=RequestMethod.POST)
public ModelAndView processSubmit(@RequestParam(value="userName")String userName) {
System.out.println(userName) ;

//以下程式供回傳用
ModelAndView mav = new ModelAndView("successView") ;
mav.addObject("userName", userName) ;
return mav ;
}

    2.2 View中呈現Controller回傳值的方式為：<c:out value="${userName}">或直接寫${userName}也可以


3. HttpServletRequest

    3.1 Controller的寫法如下：(Form為<form method="POST"><input name="userName" type="text" /></form>)

@RequestMapping(method=RequestMethod.POST)
public ModelAndView processSubmit(HttpServletRequest req) {
System.out.println(req.getParameter("userName")) ;
...
}