if (pwd==lostpwd) {
			response.sendRedirect("updateSuccess.jsp");
			ITeacherService teacher = new TeacherServiceImpl();
			boolean result = teacher.UpdatePwdByUid(newpwd, id);
		}else {
			request.setAttribute("pwdError", "pwdError");
			request.getRequestDispatcher("updatePwd.jsp").forward(request, response);
		}

在做毕设教师信息查询系统的时候，做修改密码的时，原密码和登陆时的密码进行判断。
本来是用==来进行判断的，结果用debug看到直接跳到else里面去了。

后再网上找到string类型要用到equals来进行判断。就可以顺利运行了。

if (pwd.equals(lostpwd)) {
			response.sendRedirect("updateSuccess.jsp");
			ITeacherService teacher = new TeacherServiceImpl();
			boolean result = teacher.UpdatePwdByUid(newpwd, id);
		}else {
			request.setAttribute("pwdError", "pwdError");
			request.getRequestDispatcher("updatePwd.jsp").forward(request, response);
		}