包的结构：dao,dao.impl,service,service.impl,util,test,web.controller,web.formbean,web.UI
用到的东西：
hibernate3.6,jstl,beanutils(其中jstl和beanutils貌似eclipse自带)
流程：
几个要点：
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web.UI包存在的原因是为了保护jsp，将jsp放到WEB-INF目录下，不能直接访问，这时用servlet进行跳转
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登录成功后进行重定向到首页，因此将用户放到session域中，而在注销的时候getSession（false)，且不要忘了删除
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等待几秒刷新使用http头进行模拟 <meta http-equiv="refresh" content="3; url=xxx">
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在主页使用jstl的c:if标签进行判断，如果有用户，显示hello，否则显示登录或注册提示，判断为空用empty
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验证写在formbean里，错误放到formbean的一个hashmap里，并且出错后放到request里的是整个formbean
一些代码类似于模版代码：
- HibernateUtil
public class HibernateUtil { private static final SessionFactory sessionFactory=buildSessionFactory(); private static SessionFactory buildSessionFactory(){ try{ return new Configuration().configure().buildSessionFactory(); }catch(Throwable ex){ System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory(){ return sessionFactory; } }
- md5加密
public static String md5(String src){ try { MessageDigest md=MessageDigest.getInstance("md5"); byte[] md5=md.digest(src.getBytes()); BASE64Encoder encoder=new BASE64Encoder(); return encoder.encode(md5); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); throw new RuntimeException(e); } }
- request2bean,copybean
public static <T> T request2bean(HttpServletRequest request,Class<T> type){ Enumeration names=request.getParameterNames(); T bean; try { bean = type.newInstance(); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException(e); } HashMap map=new HashMap(); while(names.hasMoreElements()){ String name=(String) names.nextElement(); map.put(name, request.getParameter(name)); } try { BeanUtils.populate(bean, map); return bean; } catch (Exception e) { e.printStackTrace(); throw new RuntimeException(e); } } public static void copyBean(Object dest,Object src){ //注册自定义对象转换类 ConvertUtils.register(new Converter(){ @Override public Object convert(Class type, Object value) { SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd"); String dateStr=(String) value; if(!StringUtils.isNullOrEmpty(dateStr)){ try { return df.parse(dateStr); } catch (ParseException e) { e.printStackTrace(); } } return null; } }, Date.class); try { BeanUtils.copyProperties(dest, src); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException(e); } }
- hibernate的save
public void addUser(User user) { Session session=null; Transaction ts=null; try { session = sf.openSession(); ts = session.beginTransaction(); ts.begin(); session.save(user); Query query=session.createQuery("from User where username=? and password=?");
query.setParameter(0, username);
query.setParameter(1, password);
List<User> result=query.list();
ts.commit(); } catch (Exception e) { if(ts!=null){ ts.rollback(); } e.printStackTrace(); throw new RuntimeException("failed to add user."); }finally{ if(session!=null && session.isOpen()){ session.close(); } } } - hibernate配置文件和映射文件
<?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- Database connection settings --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost:3306/javaweb</property> <property name="connection.username">root</property> <property name="connection.password">123456</property> <!-- JDBC connection pool (use the built-in) --> <property name="connection.pool_size">1</property> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <!-- Enable Hibernate's automatic session context management --> <property name="current_session_context_class">thread</property> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <!-- Drop and re-create the database schema on startup --> <property name="hbm2ddl.auto">create</property> <mapping resource="com/libin/domain/User.hbm.xml"/> </session-factory> </hibernate-configuration>
<?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.libin.domain"> <class name="User" table="user"> <id name="id" column="user_id"> <generator class="uuid" /> </id> <property name="username"> <column name="username" not-null="true" /> </property> <property name="password"> <column name="password" not-null="true" /> </property> <property name="email"> <column name="email" length="30" not-null="true" /> </property> <property name="birthday" type="date" /> </class> </hibernate-mapping>