bsuart's questions

表中有 2 个单选按钮：

  <tr>
    <td>
        <input type="radio" name="oneBed" id="oneBed" value="1">
        <label for="oneBed">1 bed in room</label>
    </td>
    <td>
        <input type="radio" name="twoBed" id="twoBed" value="2">
        <label for="twoBed">2 bed in room</label>
    </td>
  </tr>

有必要在更改选择时从另一个单选按钮取消选中该检查

我有一个 DataGridView：

删除按钮应删除在 DataGridView 中选择的行。问题：应该调用什么方法来删除选定的行？

我是否正确理解了 jwt 在微服务架构中的使用：

在身份验证期间，会为用户创建访问令牌和刷新令牌。刷新令牌存储访问令牌的 id。访问令牌在标头中发送给用户并存储在 WebStorage 或 Cookies 中，而访问令牌存储在某处（数据库或文件）。在服务器上客户端用户的后续请求中，访问令牌被发送到服务器，在那里检查其有效性，然后，如果成功，则检查生命周期，如果有，则发出新的访问令牌。

一个微服务通过什么或借助什么与另一个微服务交互？

在 Spring MVC 上有一个 Web 应用程序，客户端向服务器端发送 Ajax 请求。

有一个类映射到：

@RequestMapping("/cars")

映射接受 Ajax 请求的方法：

@RequestMapping(method = RequestMethod.POST) 

阿贾克斯请求：

 $.ajax({
            type: 'POST',
            url:  '/cars',
            data: msg,
            success: function(receive) {
              alert(receive);
            },
            error: function() {
                alert('Error');
            }
        });

瓦尔尼克名称：商店

问题：

当我通过 IDEA localhost:8080/cars启动时，请求被处理，当通过服务器localhost:8080/shop/cars - 错误 404

问题： Ajax 将请求发送到什么地址 - 从其描述中的 url 字段向根 url 附加一个字符串？

这里有张桌子：

<table class="table_dark">
    <caption>FLIGHTS</caption>
    <tr>
        <th>Id</th>
        <th>Navigation</th>
        <th>Registration to flight</th>
    </tr>
    <c:forEach var="flight" items="${flights}">
        <tr id="tr${flight.id}">
            <td>${flight.id}</td>
            <td>${flight.navigation}</td>
            <td><input type="submit" onclick="registrationClickHandler(event);" value="Register" id="register${flight.id}" class="myButtonStyle1"></td>
        </tr>
    </c:forEach>
</table>

表图：

当您单击“注册”按钮以隐藏所有其他 tr 时，这是必要的。当您单击关闭按钮( id=closeButton ) 时再次显示。

问题：最好的方法是什么？

需要禁止用户直接访问（从浏览器通过url访问）jsp页面。同时，我的页面在 WEB-INF/view 文件夹中，无论如何，注册了 url，我得到了任何页面。

如何限制直接访问？

表格：

 <form method="DELETE" action="" id="deleteForm">
      <c:forEach var="flight" items="${flights}">
             <tr>
               <td>${flight.id}</td>
               <td>${flight.navigation}</td>
               <td>${flight.team.id}</td>
               <td><input type="submit" value="Delete flight" id="${flight.id}" onclick="deleteButtonClickHandler(event)"></td>
               </tr>
      </c:forEach>
 </form>

处理程序：

(function () {
    var idFlight = 0;
    function deleteButtonClickHandler(event) {
      idFlight = //id кнопки
    }   
})();

问题： 如何获取调用处理函数的按钮的id？

通用道.java：

@Repository
public abstract class GenericDao<T> implements GeneralDao<T> {

    private Class<T> className;

    public GenericDao(Class<T> className) {
        this.className = className;
    }

    @PersistenceContext
    private EntityManager entityManager;

    public EntityManager getEntityManager() {
        return entityManager;
    }

    @Override
    public void add(T object) {
        try {
            getEntityManager().persist(object);
        } catch (HibernateException e) {
            throw new DaoException(ErrorMessage.ADD_ENTITY_FAIL, e);
        }
    }

    @Override
    public void update(T object) {
        try {
            getEntityManager().merge(object);
        } catch (HibernateException e) {
            throw new DaoException(ErrorMessage.UPDATE_ENTITY_FAIL, e);
        }
    }

    @Override
    public void remove(T object) {
        try {
            getEntityManager().remove(object);
        } catch (HibernateException e) {
            throw new DaoException(ErrorMessage.REMOVE_ENTITY_FAIL, e);
        }
    }

    @Override
    public T getById(int id) {
        try {
            return getEntityManager().find(this.className, id);
        } catch (HibernateException e) {
            throw new DaoException(ErrorMessage.GET_BY_ID_ENTITY_FAIL, e);
        }
    }

    public abstract List<T> getAll() throws DaoException;

}

通用服务.java

@Service
public abstract class GenericService<T> implements GeneralService<T> {
    private static Logger logger = Logger.getLogger(GenericService.class);

    @Autowired
    private GenericDao<T> dao;

    @Transactional
    @Override
    public void add(T object) throws ServiceException {
        try {
           dao.add(object);
        } catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
    }

    @Transactional
    @Override
    public void update(T object) throws ServiceException {
        try {
            dao.update(object);
        } catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
    }

    @Transactional
    @Override
    public void remove(T object) throws ServiceException {
        try {
            dao.remove(object);
        } catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
    }

    @Transactional(readOnly = true)
    @Override
    public T getById(int id) throws ServiceException {
        try {
            return dao.getById(id);
        } catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
    }

    @Transactional(readOnly = true)
    @Override
    public List<T> getAll() throws ServiceException {
        try {
            return dao.getAll();
        } catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
    }

}

UserServiceImpl.java：

@Service
public class UserServiceImpl extends GenericService<User> implements UserService {
    private static Logger logger = Logger.getLogger(UserServiceImpl.class);

    @Autowired
    private UserDao userDao;

    @Transactional
    @Override
    public String checkUser(String userLogin, String userPassword) throws ServiceException {
        String namePage = "errorAuthorization";
        List<User> userList;
        try {
           userList = userDao.getByLoginAndPassword(userLogin, userPassword);
        }  catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
        if(userList.size() != 0) {
            return UserRoleChecker.defineUserPage(userList.get(0));
        }
        return namePage;
    }

    @Transactional
    @Override
    public void addUser(String userLogin, String userPassword, String userMail) throws ServiceException {
        Role role = new Role(0L, RoleType.USER);
        User user = new User(0L, userLogin, userPassword, userMail, role);
        add(user);
    }

}

用户控制器.java：

@Controller
public class UserController {
    private static String className = UserController.class.getName();
    private static Logger logger = Logger.getLogger(UserController.class.getName());

    @Autowired
    private UserService userService;

    @RequestMapping(value = "/check_user", method = RequestMethod.POST)
    public ModelAndView authorizationUser(HttpServletRequest request, HttpServletResponse response) {
        ModelAndView modelAndView = new ModelAndView();
        String returnPage;
        try {
            returnPage = userService.checkUser(request.getParameter(RequestParameter.USER_LOGIN), request.getParameter(RequestParameter.USER_PASSWORD));
        } catch (ServiceException e) {
            logger.debug(e);
            returnPage = ErrorHandler.returnErrorPage(e.getMessage(), className);
        }
        modelAndView.setViewName(returnPage);
        return modelAndView;
    }

    @RequestMapping(value = "/add_user", method = RequestMethod.POST)
    public ModelAndView registrationUser(HttpServletRequest request, HttpServletResponse response) {
        ModelAndView modelAndView = new ModelAndView();
        String returnPage = Page.SUCCESSFUL_REGISTRATION;
        try {
            userService.addUser(request.getParameter(RequestParameter.USER_LOGIN), request.getParameter(RequestParameter.USER_PASSWORD), request.getParameter(RequestParameter.USER_MAIL));
        }  catch (ServiceException e) {
            logger.debug(e);
           returnPage = ErrorHandler.returnErrorPage(e.getMessage(), className);
        }
        modelAndView.setViewName(returnPage);
        return modelAndView;
    }

}

根上下文.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:c="http://www.springframework.org/schema/c"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:util="http://www.springframework.org/schema/util"
       xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <context:annotation-config />

    <context:component-scan base-package="by.netcracker.artemyev.dao" />
    <context:component-scan base-package="by.netcracker.artemyev.service" />
    <context:component-scan base-package="by.netcracker.artemyev.web" />

    <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
        <property name="url" value="jdbc:mysql://localhost:3306/airline?useSSL=false" />
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
        <property name="initialSize" value="5"/>
        <property name="maxTotal" value="10"/>
    </bean>

    <bean id="entityManager" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan" value="by.netcracker.artemyev" />
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="true" />
                <property name="database" value="MYSQL" />
                <property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect" />
            </bean>
        </property>
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="debug">true</prop>
                <prop key="connection.isolation">2</prop>
                <prop key="hibernate.cglib.use_reflection_optimizer">true</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
            </props>
        </property>
        <property name="jpaDialect" ref="jpaDialect" />
    </bean>

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />

    <tx:annotation-driven transaction-manager="transactionManager" />

    <bean id="jpaDialect" class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" />

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManager" />
        <property name="dataSource" ref="dataSource" />
        <property name="jpaDialect" ref="jpaDialect" />
    </bean>

</beans>

日志：

org.springframework.web.servlet.FrameworkServlet 2017-05-10 22:23:59,107 DEBUG - Could not complete request
javax.persistence.TransactionRequiredException: No EntityManager with actual transaction available for current thread - cannot reliably process 'persist' call
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:282)
    at com.sun.proxy.$Proxy27.persist(Unknown Source)
    at by.netcracker.artemyev.dao.GenericDao.add(GenericDao.java:35)
    at by.netcracker.artemyev.service.GenericService.add(GenericService.java:24)
    at by.netcracker.artemyev.service.impl.UserServiceImpl.addUser(UserServiceImpl.java:48)
    at by.netcracker.artemyev.web.UserController.registrationUser(UserController.java:45)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:495)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:767)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1354)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

为什么会出现此错误以及如何解决？

通用道：

@Repository
public abstract class GenericDao<T> implements GeneralDao<T> {

    private Class<T> className;

    protected GenericDao(Class<T> className) {
        this.className = className;
    }

    @PersistenceContext
    private EntityManager entityManager;

    public EntityManager getEntityManager() {
        return entityManager;
    }

    @Override
    public void add(T object) {
        try {
            getEntityManager().persist(object);
        } catch (HibernateException e) {
            throw new DaoException(ErrorMessage.MESSAGE_ADD_ENTITY_FAIL, e);
        }
    }

    @Override
    public void update(T object) {
        try {
            getEntityManager().merge(object);
        } catch (HibernateException e) {
            throw new DaoException(ErrorMessage.MESSAGE_UPDATE_ENTITY_FAIL, e);
        }
    }

    @Override
    public void remove(T object) {
        try {
            getEntityManager().remove(object);
        } catch (HibernateException e) {
            throw new DaoException(ErrorMessage.MESSAGE_REMOVE_ENTITY_FAIL, e);
        }
    }

    @Override
    public T getById(int id) {
        try {
            return getEntityManager().find(this.className, id);
        } catch (HibernateException e) {
            throw new DaoException(ErrorMessage.MESSAGE_GET_BY_ID_ENTITY_FAIL, e);
        }
    }

    public abstract List<T> getAll() throws DaoException;

}

用户道.java：

@Repository
public class UserDao extends GenericDao<User> {
    private final static String USER_LOGIN = "login";
    private final static String USER_PASSWORD = "password";

    private UserDao() {
        super(User.class);
    }

    @Override
    public List<User> getAll() {
        List<User> userList;
        try {
            userList = getEntityManager().createQuery(Statement.GET_ALL_USERS).getResultList();
        } catch (HibernateException e) {
            throw new DaoException(ErrorMessage.MESSAGE_GET_ALL_ENTITY_FAIL, e);
        }
        return userList;
    }

    public List<User> getByLoginAndPassword(String userLogin, String userPassword) {
        CriteriaQuery<User> criteriaQuery;
        try {
            CriteriaBuilder criteriaBuilder = getEntityManager().getCriteriaBuilder();
            criteriaQuery = criteriaBuilder.createQuery(User.class);
            Root<User> userRoot = criteriaQuery.from(User.class);
            criteriaQuery.select(userRoot);
            criteriaQuery.where(
                    criteriaBuilder.equal(userRoot.get(USER_LOGIN), userLogin),
                    criteriaBuilder.equal(userRoot.get(USER_PASSWORD), userPassword)
            );
        } catch (HibernateException e) {
            throw new DaoException(ErrorMessage.MESSAGE_GET_ENTITY_BY_LOGIN_AND_PASSWORD_FAIL, e);
        }
        return getEntityManager().createQuery(criteriaQuery).getResultList();
    }
}

通用服务.java:

@Service
public abstract class GenericService<T> implements GeneralService<T> {

    private static Logger logger = Logger.getLogger(GenericService.class);

    @Autowired
    private GenericDao<T> dao;

    @Transactional
    @Override
    public void add(T object) throws ServiceException {
        try {
           dao.add(object);
        } catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
    }

    @Transactional
    @Override
    public void update(T object) throws ServiceException {
        try {
            dao.update(object);
        } catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
    }

    @Transactional
    @Override
    public void remove(T object) throws ServiceException {
        try {
            dao.remove(object);
        } catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
    }

    @Transactional(readOnly = true)
    @Override
    public T getById(int id) throws ServiceException {
        try {
            return dao.getById(id);
        } catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
    }

    @Transactional(readOnly = true)
    @Override
    public List<T> getAll() throws ServiceException {
        try {
            return dao.getAll();
        } catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
    }

}

用户服务.java

@Service
public class UserService extends GenericService<User> {

    private static Logger logger = Logger.getLogger(UserService.class);

    @Autowired
    private UserDao userDao;

    @Transactional
    public String checkUser(String userLogin, String userPassword) throws ServiceException {
        String namePage = "errorAuthorization";
        List<User> userList;
        try {
           userList = userDao.getByLoginAndPassword(userLogin, userPassword);
        }  catch (DaoException e) {
            logger.debug(e);
            throw new ServiceException(e.getMessage());
        }
        if(userList.size() != 0) {
            return UserRoleChecker.defineUserPage(userList.get(0));
        }
        return namePage;
    }

    public void addUser(String userLogin, String userPassword, String userMail) throws ServiceException{
        Role role = new Role(0, RoleType.USER);
        User user = new User(0, userLogin, userPassword, userMail, role);
        add(user);
    }

}

用户控制器.java：

@Controller
public class UserController {
    private static String className = UserController.class.getName();

    @Autowired
    private UserService userService;

    @RequestMapping(value = "/check_user", method = RequestMethod.POST)
    public ModelAndView authorizationUser(HttpServletRequest request, HttpServletResponse response) {
        ModelAndView modelAndView = new ModelAndView();
        String returnPage;
        try {
            returnPage = userService.checkUser(request.getParameter(RequestParameter.USER_LOGIN), request.getParameter(RequestParameter.USER_PASSWORD));
        } catch (ServiceException e) {
            returnPage = ErrorHandler.returnErrorPage(e.getMessage(), className);
        }
        modelAndView.setViewName(returnPage);
        return modelAndView;
    }

    @RequestMapping(value = "/add_user", method = RequestMethod.POST)
    public ModelAndView registrationUser(HttpServletRequest request, HttpServletResponse response) {
        ModelAndView modelAndView = new ModelAndView();
        String returnPage = Page.SUCCESSFUL_REGISTRATION;
        try {
            userService.addUser(request.getParameter(RequestParameter.USER_LOGIN), request.getParameter(RequestParameter.USER_PASSWORD), request.getParameter(RequestParameter.USER_MAIL));
        }  catch (ServiceException e) {
           returnPage = ErrorHandler.returnErrorPage(e.getMessage(), className);
        }
        modelAndView.setViewName(returnPage);
        return modelAndView;
    }

}

根上下文.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:c="http://www.springframework.org/schema/c"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:util="http://www.springframework.org/schema/util"
       xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <context:annotation-config />

    <context:component-scan base-package="by.netcracker.artemyev" />

    <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
        <property name="url" value="jdbc:mysql://localhost:3306/airline?useSSL=false" />
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
        <property name="initialSize" value="5"/>
        <property name="maxTotal" value="10"/>
    </bean>

    <bean id="entityManager" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan" value="by.netcracker.artemyev" />
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="true" />
                <property name="database" value="MYSQL" />
                <property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect" />
            </bean>
        </property>
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="debug">true</prop>
                <prop key="connection.isolation">2</prop>
                <prop key="hibernate.cglib.use_reflection_optimizer">true</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
            </props>
        </property>
        <property name="jpaDialect" ref="jpaDialect" />
    </bean>

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />

    <tx:annotation-driven transaction-manager="transactionManager" />

    <bean id="jpaDialect" class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" />

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManager" />
        <property name="dataSource" ref="dataSource" />
        <property name="jpaDialect" ref="jpaDialect" />
    </bean>

</beans>

日志：

org.springframework.web.context.ContextLoader 2017-05-09 11:48:21,198 ERROR - Context initialization failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userController': Unsatisfied dependency expressed through field 'userService'; nested exception is org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'userService' is expected to be of type 'by.netcracker.artemyev.service.UserService' but was actually of type 'com.sun.proxy.$Proxy31'
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:443)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:325)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4744)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5206)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1702)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:456)
    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:405)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
    at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
    at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
    at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)
    at sun.rmi.transport.Transport$1.run(Transport.java:200)
    at sun.rmi.transport.Transport$1.run(Transport.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'userService' is expected to be of type 'by.netcracker.artemyev.service.UserService' but was actually of type 'com.sun.proxy.$Proxy31'
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.checkBeanNotOfRequiredType(DefaultListableBeanFactory.java:1503)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1482)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
    ... 60 more

问题：为什么会出现这个错误，如何解决？

    public T getById(int id) {
    return entityManager.find(T.class, id);
    }

错误：T 无法从类型变量中进行选择。成立：

 ReflectionUtils.getGenericParameterClass(..) - не работает

问题是如何传递参数化的类对象？

如何在 Spring 上下文文件中定义 Hibernate 设置？

注册.html：

  <!DOCTYPE html>
  <html lang="en">
  <head>
     <title>Authorization page</title>
  </head>
  <body>
    <form name="loginForm" method="POST" action="controller">
      <input type="hidden" name="command" value="login"/>
      <br/>Login:<br/>
      <input type="text" name="login" value=""/>
      <br/>Password:<br/>
      <input type="password" name="password" value=""/>
      <input type="submit" value="Log in" />
      </form></hr>
  </body>
 </html>

转到 registration.html：

 <a class="page-scroll" onclick="location.href='html/test.html';">Sign in</a>

从表单发送数据是通过 url 执行的：http://localhost:8080/airline/html/controller

你需要 url: http://localhost:8080/airline/controller

该项目分为3个模块：

根 xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>

   <groupId>com.java.art</groupId>
   <artifactId>airline</artifactId>
   <version>1.0-SNAPSHOT</version>

   <modules>
      <module>web</module>
      <module>services</module>
      <module>dao</module>
   </modules>

</project>

该项目是一个网络应用程序。项目是如何建设的？

我的例子：

群号：

com.namecompany.nameproject

工件编号：

名称项目

问题：这个命名正确吗？如果项目包含模块——他们应该有什么artifactId ， artifactId:nameprojectNamemodule？

方法：

public void find() {
    String input = null;
    BufferedReader bRead = new BufferedReader(new InputStreamReader(System.in));
    try {
        input = bRead.readLine();
    } catch (IOException e1) {
        e1.printStackTrace();
    } finally {
        if(bRead != null) {
            try {
                bRead.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

出现错误：

java.io.IOException: Stream closed
at java.io.BufferedInputStream.getBufIfOpen(BufferedInputStream.java:170)
at java.io.BufferedInputStream.read(BufferedInputStream.java:336)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:161)
at java.io.BufferedReader.readLine(BufferedReader.java:324)
at java.io.BufferedReader.readLine(BufferedReader.java:389)

主要的：

public static void main(String args[]) {
    B b = new B();
    b.find();
    b.find();
}

输入流必须在 section 中关闭finally。怎么做才能不掉下来？

重定义clone()函数时，如果类有引用字段，那么就必须进行深度克隆。

@Override
public Employee clone() throws CloneNotSupportedException{
    Employee e = (Employee)super.clone();
    e.hireDay = (Date)hireDay.clone();
    return e;
}

如果它是指向列表的链接：

 class Класс {
 List<Класс2> list;
 }

重新定义完成：

 Класс e = (Класс)super.clone();
 for(int i = 0; i<e.list.size(); i++){
 e.list.get(i).clone(); 
 } 
 return e;

这是对的吗？

该类有6个字段，每个字段都要检查值的正确性：检查参数的值是否为负数。我理解可以直接在构造函数中检查值，如果不正确，抛出异常. 问题：如何组织参数验证，我的意思是这个操作是否有模式或其他模板？

有一个带参数的构造函数，例如：constructor(parameter1, parameter2); 我想防止将 null 作为 parameter2 的参数。怎么做？

创建您自己的异常并检查 parameter2 是否为 null，如果为 null - 抛出异常。或者还有其他方法吗？

方法toString(), hashCode(),是否应该equals()在抽象类中被重写，这有意义吗？