springMVC初步

package springmvc.controller; import java.util.HashMap; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.Controller; import springmvc.model.UserInfoBean; public class LoginController implements Controller { private String successPage; private String failurePage; public String getSuccessPage() { return successPage; } public void setSuccessPage(String successPage) { this.successPage = successPage; } public String getFailurePage() { return failurePage; } public void setFailurePage(String failurePage) { this.failurePage = failurePage; } @Override public ModelAndView handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception { return dispose(req, resp); } public ModelAndView dispose(HttpServletRequest req, HttpServletResponse resp) throws Exception { Map<String, String> map = new HashMap<String, String>(); String username = req.getParameter("username"); String password = req.getParameter("password"); String message = null; // 判断是否为空 if (username == null || password == null || username.equals("") || password.equals("")) { message = "username or password can't be null"; map.put("msg", message); return new ModelAndView(getFailurePage(), map); } // 判断用户名是否存在 if (!UserInfoBean.exisitUser(username)) { message = "username doesn't exisit"; map.put("msg", message); return new ModelAndView(getFailurePage(), map); } // 如果存在,判断密码是否正确,正确跳转,错误跳转 if (!UserInfoBean.confirmPassword(username, password)) { message = "password is wrong"; map.put("msg", message); map.put("password", password); return new ModelAndView(getFailurePage(), map); } else { map.put("username", username); return new ModelAndView(getSuccessPage(), map); } } }