网上书城小工具（也适用于其他项目）

/**
     * 随机生成32位长的字符串，通常用来做实体类的ID
     * 或者是订单号
     */
    @Test
    public void testUuid() {
        String s = CommonUtils.uuid();//生成随机32位长的字符串
        System.out.println(s);
    }
    
    /**
     * 把Map类型映射成Bean类型。
     * 要求map中键的名称与Person类的属性名称相同。
     * 即map的key分别为：pid、name、age、birthday，person的属性名称也是pid、name、age、birthday
     * map的key与属性名一一对应 
     */
    @Test
    public void testToBean() {
        Map<String,String> map = new HashMap<String,String>();
        /*
         * map的key：pid、age、birthday、myname
         * person的属性：pid、age、birthday、name
         * map中没有名为name的键值，而多出一个名为myname的键值，所以映射后的person对象的name属性值为null。
         * map中的age和birthday都是字符串类型，而person的age是int类型、birthday是Date类型，但toBean()方法会自动对Map中值进行类型转换。
         */
        map.put("pid", CommonUtils.uuid());
        map.put("age", "23");
        map.put("birthday", "2014-01-30");
        map.put("myname", "张三");
        
        Person p = CommonUtils.toBean(map, Person.class);
        System.out.println(p);
    }

<?xml version="1.0" encoding="UTF-8" ?>
<c3p0-config>
    <default-config> 
        <property name="jdbcUrl">jdbc:mysql://localhost:3306/mydb1</property>
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="user">root</property>
        <property name="password">123</property>
        
        <property name="acquireIncrement">3</property>
        <property name="initialPoolSize">10</property>
        <property name="minPoolSize">2</property>
        <property name="maxPoolSize">10</property>
    </default-config>
</c3p0-config>

/**
 * 测试JdbcUtils类
 * @author qdmmy6
 *
 */
public class JdbcUtilsTest {
    /**
     * 通过C3P0连接池获取连接对象
     * @throws SQLException
     */
    @Test
    public void testGetConnection() throws SQLException {
        Connection con = JdbcUtils.getConnection();//获取连接
        System.out.println(con);
        JdbcUtils.releaseConnection(con);//如果参数con不是当前线程的连接对象，那么关闭之
    }
    
    /**
     * 当开始事务后，调用getConnection()会为当前线程创建Connection，而且多次调用getConnection()返回的是同一个对象
     * @throws SQLException 
     */
    @Test
    public void testTansaction() throws SQLException {
        JdbcUtils.beginTransaction();//开启事务
        Connection c1 = JdbcUtils.getConnection();//第一次获取当前线程的事务连接对象
        Connection c2 = JdbcUtils.getConnection();//第二次获取当前线程的事务连接对象
        Assert.assertEquals(true, c1 == c2);//比较两次是否相同
        JdbcUtils.commitTransaction();//提交事务
    }
}

public class Person {
    private String pid;
    private String name;
    private int age;
    private Date birthday;
…
}

/**
 * 测试TxQueryRunner
 * @author qdmmy6
 *
 */
public class PersonDao {
    private QueryRunner qr = new TxQueryRunner();
    
    public void add(Person person) throws SQLException {
        String sql = "insert into t_person values(?,?,?,?)";
        Object[] params = {person.getPid(), 
                person.getName(), 
                person.getAge(), 
                new java.sql.Date(person.getBirthday().getTime())};
        qr.update(sql, params);
    }
    
    public void edit(Person person) throws SQLException {
        String sql = "update t_person set name=?,age=?,birthday=? where pid=?";
        Object[] params = { 
                person.getName(), 
                person.getAge(), 
                new java.sql.Date(person.getBirthday().getTime()),
                person.getPid()};
        qr.update(sql, params);
    }
    
    public void delete(String pid) throws SQLException {
        String sql = "delete from t_person where pid=?";
        qr.update(sql, pid);
    }
    
    public Person load(String pid) throws SQLException {
        String sql = "select * from t_person where pid=?";
        return qr.query(sql, new BeanHandler<Person>(Person.class), pid);
    }
    
    public List<Person> findAll() throws SQLException {
        String sql = "select * from t_person";
        return qr.query(sql, new BeanListHandler<Person>(Person.class));
    }
}

public class PersonDaoTest {
    @Test
    public void testAdd() throws SQLException {
        Person p1 = new Person(CommonUtils.uuid(), "张三", 18, new Date());
        Person p2 = new Person(CommonUtils.uuid(), "李四", 81, new Date());
        Person p3 = new Person(CommonUtils.uuid(), "王五", 66, new Date());
        
        PersonDao dao = new PersonDao();
        dao.add(p1);
        dao.add(p2);
        dao.add(p3);
    }
    
    @Test
    public void testEdit() throws SQLException {
        PersonDao dao = new PersonDao();
        Person person = dao.load("2F371BE415984DE89781CCCA7B8734CB");
        person.setAge(88);
        dao.edit(person);
    }
    
    @Test
    public void testDelete() throws SQLException {
        PersonDao dao = new PersonDao();
        dao.delete("2F371BE415984DE89781CCCA7B8734CB");
    }
    
    @Test
    public void testFindAll() throws SQLException {
        PersonDao dao = new PersonDao();
        List<Person> list = dao.findAll();
        System.out.println(list);
    }
}

    /**
     * 测试发送普通邮件
     * @throws IOException 
     * @throws MessagingException 
     */
    @Test
    public void fun() throws MessagingException, IOException {
        Session session = MailUtils.createSession("smtp.163.com", "itcast_cxf", "itcastitcast");[创建session]
        Mail mail = new Mail("itcast_cxf@163.com", "itcast_cxf@126.com", "测试MailUtils", "这是正文！");[创建邮箱对象，参数分别为：发件人、收件人、主题、正文]
        MailUtils.send(session, mail);[发送邮件]
    }

public class AServlet extends BaseServlet {
    /**
     * 请求处理方法的参数都与doGet()和doPost()相同，即request和response
     * 但请求处理方法有String类型的返回值，而doGet()和doPost()没有返回值。
     * 在请求本方法时需要给出method=regist参数！
     */
    public String regist[访问本方法的URL为http://localhost:8080/day01/AServlet?method=regist](HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        System.out.println("AServlet regist()...");
        return "f:/index.jsp";[转发到/index.jsp页面]
    }
    
    /**
     * 在请求本方法时需要给出method=login参数！
     */
    public String login[访问本方法的URL为http://localhost:8080/day01/AServlet?method=login](HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        System.out.println("AServlet login()...");
        return "r:/index.jsp"[重定向到/index.jsp];
    }
}

<filter>
    <filter-name>EncdoingFilter</filter-name>
    <filter-class>cn.itcast.filter.EncodingFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>EncdoingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<a href="<c:url value=‘/EncodingServlet?method=test[请求EncdoingServlet的test方法]&name=张三‘/>">点击这里发出GET请求</a><br/>
<form action="<c:url value=‘/EncodingServlet‘/>" method="post">
  <input type="hidden" name="method" value="test"/>[请求EncodingServlet的test方法]
  <input type="text" name="name" value="李四"/>
  <input type="submit" value="请求这里发出POST请求"/>
</form>

/**
 * 测试EncodingFilter
 * @author qdmmy6
 *
 */
public class EncodingServlet [因为添加了EncodingFilter过滤器，那么所有的Servlet都不用再去处理请求编码的问题了。]extends BaseServlet {
    /**
     * 可以使用POST和GET两种方式请求test()方法！查看输出是否为乱码！
     */
    public String test(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String name = request.getParameter("name");
        System.out.println(name);
        return null;
    }
}

<servlet>
  <servlet-name>VerifyCodeServlet</servlet-name>
  <servlet-class>cn.itcast.vcode.servlet.VerifyCodeServlet</servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>VerifyCodeServlet</servlet-name>
  <url-pattern>/VerifyCodeServlet</url-pattern>
</servlet-mapping>

<form action="<c:url value=‘/UserServlet‘/>" method="post">
    <input type="hidden" name="method" value="regist"/>
    验证码：<input type="text" name="verifyCode"/>
    <img src="<c:url value=‘/VerifyCodeServlet‘/>"[让<img>的src指向VerifyCodeServlet即可生成一次性验证码] border="1"/><br/>
    <input type="submit" value="注册"/>
</form>

    <script type="text/javascript" src="<c:url value=‘/js/jquery-1.5.1.js‘/>"></script>[导入jquery]
    <script type="text/javascript">
        function change[在点击“换一张”时会调用本方法]() {
            $("#img").attr("src", "<c:url value=‘/VerifyCodeServlet?‘/>" + new Date().getTime());[指定<img>元素的src属性值为VerifyCodeServlet，并且追加参数为当前时间毫秒，它是不会重复的值，所以浏览器不会使用缓存，而是访问服务器。]
        }
    </script>
…
<form action="<c:url value=‘/UserServlet‘/>" method="post">
    <input type="hidden" name="method" value="regist"/>
    验证码：<input type="text" name="verifyCode"/>
    <img id="img"[指定id为img，方法使用jquery来查找该元素。] src="<c:url value=‘/VerifyCodeServlet‘/>" border="1"/>
    <a href="javascript:change();">换一张</a>[点击该超链接会调用change()方法]
    <br/>
    <input type="submit" value="注册"/>
</form>