這是我在藍橋班初學java做的第二個專案所遇到和解決的問題，寫下來紀念，順便供有緣人蔘考。
使用者名稱/手機號/郵箱+密碼登陸是當今最常用的登陸，對初學者而言這是必須掌握和精通的，這也是在我基礎薄弱的我堅持解決的動力，其中感謝隊友李青的大力協助。

前提：

model中寫好teacher實體類，並提供getter和setter方法、toString重寫轉字串。
SqlMapConfig.xml中configuration的typeAliases標籤設定別名：

<configuration>
 <typeAliases>
  <typeAlias type="com.lq.model.Teacher" alias="teacher"/>
 </typeAliases>
</configuration>
 

service層applicationContext-service.xml中使用 dubbo協議設定要暴露的介面

<dubbo:service interface="com.lq.service.ITeacherService" ref="teacherService" protocol="dubbo" />

web層spring-servlet.xml中配置zookeeper
注：執行時別忘啟動zookeeper

<dubbo:reference id="teacherService" interface="com.lq.service.ITeacherService" timeout="1200000"/>
 

teacherLogin.jsp

<form class="form-auth-small" action="/teacher/teacherLogin.do" method="post">
	<div class="form-group">
		<label for="signin-email" class="control-label sr-only">教師姓名</label>
		<input type="text" class="form-control" id="signin-email" 
		placeholder="輸入使用者名稱/郵箱/手機號" name="teaName">
	</div>
	<div class="form-group">
		<label for="signin-password" class="control-label sr-only">密碼</label>
		<input type="password" class="form-control" id="signin-password" 
		autocomplete="off" name="teaPassword">
	</div>
	<div class="error-mess">
		<span id="error-message">帳戶名或登入密碼不正確，請重新輸入</span>
	</div>
	
	<div class="form-group clearfix">
		<label class="fancy-checkbox element-left">
			<input type="checkbox">
			<span>記住密碼</span>
		</label>
	</div>
	<button type="submit" class="btn btn-primary btn-lg btn-block">登陸</button>
	<div class="bottom">
		<span class="helper-text">
			<i class="fa fa-lock"></i> 
			<a href="#">忘記密碼?</a>
		</span>
	</div>
</form>
 

解決思路

共有2種方法
（1）正則表示式寫於controller層。
判斷2次輸入的值是否匹配手機號或郵箱，預設使用者名稱登陸。如果輸入的值為手機號/郵箱，則將model實體類的使用者名稱的setter方法置空，並將前端傳過來的值賦給手機號的setter方法。
注：js和java實現同效，用的正則表示式不一樣
（2）jsp前端中用js進行正則表示式判斷。

TeacherController.java

@Controller
@RequestMapping("/teacher")
public class TeacherController {
	@Autowired
	private ITeacherService teacherService;
	
	@RequestMapping(value="/teacherLogin",method=RequestMethod.POST)
	public String teaLogin(Teacher teacher,Model model,HttpServletRequest request) {
		HttpSession session = request.getSession();
		
		String teaName=teacher.getTeaName();
		String teaPassword=teacher.getTeaPassword();
		
		//判斷是郵箱還是手機號的正則表示式
		String em = "^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$";/*注：js和java用正則表示式不一樣*/
		/*String em ="/^\\[email protected]\\w+\\.[A-Za-z]{2,3}(\\.[A-Za-z]{2,3})?$/";*/     /*js用正則表示式*/ 
		String ph = "^((13[0-9])|(15[^4,\\D])|(17[0-9])|(18[0,5-9]))\\d{8}$";  /*java用驗證手機號*/
		
		/*測試用程式碼,前臺輸入手機號時測試，matches返回true/false*/
		/*System.out.println(teaName);
		System.out.println(teaName.matches(ph));*/
		
		if(teaName.matches(ph)) {
			/*如果匹配上則將教師名置空，並將teaName中的值寫到setTeaPhone()方法中*/
			teacher.setTeaName(null);
			teacher.setTeaPhone(teaName);
			
			/*程式碼測試用*/
			System.out.println(teacher.getTeaPhone());
			
		}else if(teaName.matches(em)) {
			teacher.setTeaName(null);
			teacher.setTeaEmail(teaName);
		}
		
		Teacher teaTem=teacherService.teaLogin(teacher);
		if(teaTem==null) {
			return "fail";
		}
		request.getSession().setAttribute("sessionTeacher", teaTem);
		return "/manager/manager";
	}
}

介面ITeacherService

public interface ITeacherService {
	//驗證老師登入
	public Teacher teaLogin(Teacher teacher);
}

實現介面類TeacherService

@Service("teacherService")
public class TeacherService implements ITeacherService {
	@Autowired
	private TeacherMapper teacherMapper;

	@Override
	public Teacher teaLogin(Teacher teacher) {
		/*測試用程式碼*/
		/*System.out.println(teacher.getTeaPhone());
		System.out.println(teacher.getTeaPassword());
		System.out.println(teacher.getTeaName());
		System.out.println(teacher.getTeaEmail());*/
		
		return teacherMapper.teaLogin(teacher);
	}
}

注：此專案採用面向介面程式設計，故Dao層也是介面TeacherMapper.java
(面向介面程式設計，必須xml配置檔案的id必須與Dao層java檔案中的方法名一致）

public interface TeacherMapper {
	//驗證老師登入
	public Teacher teaLogin(Teacher teacher);
}

TeacherMapper.xml做if test動態sql

<mapper namespace="com.lq.dao.TeacherMapper">
<!--此處編寫sql語句-->
<select id="teaLogin" parameterType="teacher" resultType="teacher">
	select * from teacher where 1=1
	<if test="teaName!=null and teaName!=''">
		and teaName=#{teaName}
	</if>
	<if test="teaPhone!=null and teaPhone!=''">
		and teaPhone=#{teaPhone}
	</if>
	<if test="teaEmail!=null and teaEmail!=''">
		and teaEmail=#{teaEmail}
	</if>
	<if test="teaPassword!=null and teaPassword!=''">
		and teaPassword=#{teaPassword}
	</if>
</select>
</mapper>

（2）jsp前端中用js進行正則表示式判斷。
teacherLogin.jsp

<form class="form-auth-small" action="/teacher/teacherLogin.do" method="post" onSubmit="return checkForm()">
 <div class="form-group">       
  <input type="text" class="form-control" id="signin-mess" name="teaName" 
  onblur="checkTeaMess()" placeholder="使用者名稱">
 </div>
 <div class="form-group">         
  <input type="password" class="form-control" id="signin-password"  name="teaPassword" 
  onblur="checkPassword()" placeholder="請輸入密碼">
 </div>
 
 <!-- 錯誤資訊提示 -->
 <div class="error-mess">
  <span id="error-message" >${error_mess }</span>
 </div>
 
 <button type="submit" id="submit" class="btn btn-primary btn-lg btn-block">登陸</button>
 <div class="bottom">
  <span class="helper-text"><i class="fa fa-lock"></i> <a href="#">忘記密碼?</a></span>
 </div>
</form>```
……
/*js程式碼：*/
<script type="text/javascript" language="javascript">
	function checkForm(){ 
		  var teaName = checkTeaMess(); 
		  var teaPassword = checkPassword(); 
		  return teaName && teaPassword; 
	} 
 
	function checkPassword(){
		var teaPassword = $("#signin-password").val(); 
		 var errorMess=$("#error-message");
		if(teaPassword.length==0){
			errorMess.innerHtml="使用者名稱不能為空";
			/* errorMess.css({'display':'block','color':'red'}); */
		}
		return true;
	}
	
	function checkTeaMess(){
		var regPhone=/^1[34578]\d{9}$/;/* 手機號驗證，11位手機號 */
		var regName=/^\w{3,}$/;/*教師名驗證，至少三位 */
		var regEmai=/^\[email protected]\w+\.[A-Za-z]{2,3}(\.[A-Za-z]{2,3})?$/;
		
		/* 獲取教師登陸資訊 */
		var teaName = $("#signin-mess").val();//獲取輸入登陸資訊
		var teaPassword=$("#signin-password").val();//獲取輸入的密碼
		 var errorMess=$("#error-message");
		
		/* 判斷使用者輸入是否為郵箱，是則將name屬性值改為郵箱 */
		if(regEmai.test(teaName)){
			$("#signin-mess").attr("name","teaEmail");
		}	
		
		/* 判斷使用者輸入是否為郵箱，是則將name屬性值改為郵箱 */
		if(regPhone.test(teaName)){
			$("#signin-mess").attr("name","teaPhone");
		}
	}
</script>