redirect關鍵字

如果在返回路徑前加上redirect，則是客戶端跳轉，即瀏覽器位址列中的地址會改變成當前頁面，如果沒有加redirect，則是伺服器端跳轉，即瀏覽器位址列中地址不發生變化

/**
 * 
 * @author Administrator
 *登入contorller
 */
@Controller
@RequestMapping("/loginService")
public class LoginController {
	private User user;
	@Resource
	private LoginService loginservice;
	
	@RequestMapping(value="/dologin",method=RequestMethod.POST)
	public String dologin(User user,HttpSession session){
		this.user = this.loginservice.dologin(user);
		session.setAttribute("loginUser", this.user);
		return "redirect:/file/main.jsp";
 

	}


}