@RequestMapping在春天

Question

我是spring mvc的新手，我不明白如何使用注释@RequestMapping。 这是控制器登录的代码：

 @Controller
 @RequestMapping(value="/")
 public class LoginController {
       protected final Logger log = Logger.getLogger(LoginController.class);

       @Autowired // The authenticate service is automatically injected into this controller
       private AuthenticateService service;

       @RequestMapping(value = "{pathLogin}", method = RequestMethod.GET)
       public String initFrom(@PathVariable("pathLogin") String path) {
            log.info("Return on log view...."+path);
            return "login";
        }

       @RequestMapping(value = "{pathOnSubmit}", method = RequestMethod.POST)
       public String onSubmit(@RequestParam("username") String username, 
                          @RequestParam("password") String password,  @PathVariable("pathOnSubmit") String path, HttpServletRequest request) {
          String message = "Invalid credential or Inexistent Username";
          if(!service.authentification(username, password)) {
               path = "login";
               return "login";
          }else {
             path = "homePage";
             return "homePage";
          }
        }

login.jsp中的表单是：

    <form method="post" action="">
          //here some input for the form
    </from>

当我在网址中发出GET请求时："http:/...../Project_administration/login.htm"一切都没问题。但是当我提交POST请求时，如果我输入了正确的用户名和密码，则在控制器中执行ELSE block并且请求在"/WEB-INF/jsp/homePage.jsp" InternalResourceView中转发。问题是网址，"http:/...../Project_administration/homePage.htm"没有更改。我不知道为什么。
有人可以帮忙吗？ 谢谢......