小编dar*_*ain的帖子

他们用拉丁语编码吗？
他们有自己的编程语言吗？

我只是好奇.

我想在本地测试JavaMail,所以我需要一个邮件服务器.我可以使用任何免费邮件服务器吗？

我在一个小组项目中工作,每次结账后
我都要删除并添加javamail api ..(因为路径是相对的)我怎样才能在Project文件夹中创建它？

这是我添加库的方式:

1. 右键单击librarys文件夹
2. 添加/ jar文件夹..
3. 选择mail.jar

但当我的同事检查出来时......他得到了问题.我怎样才能使路径绝对？

我正在尝试对我的网站进行搜索功能:
不幸的是我不知道怎么做？

是一个足够的搜索功能吗？例如:

SELECT * FROM Employees WHERE (Title Like 'Title%')

还是有更专业的方法？(例如正则表达式)

我有一个方法...我找不到错误:

    public String getUsernameforID(int id) {
    String statment = "SELECT USERNAME  FROM `BENUTZER` WHERE `ID` = ? ;";
    String username = null;
    try {
        PreparedStatement ps = dbCommunicator.getStatment(statment);  // HERE : NULL POINTER EXECTION
        ps.setInt(1, id);
        ResultSet rs = dbCommunicator.readFromDB(ps);

        if (rs.first()) {
            username = rs.getString("USERNAME");
        }
    } catch (SQLException ex) {
        Logger.getLogger(DBManager.class.getName()).log(Level.SEVERE, null, ex);
    }
    return username;

我认为这是声明......但我怎么能找到这个呢？我得到一个Null Pointer Exeption.

编辑:我的getStatment方法:

    public PreparedStatement getStatment(String st) {
    connect();
    PreparedStatement ps = null;
    try {
        ps = (PreparedStatement) connection.prepareStatement(st);
    } catch …

我是德国大学的本科学生.
我有一个团队编程课程..我们必须使用JavaEE/JSF来建立一个社交网站..像LinkedIn.
无论如何,我的小组创造了很多豆子.哪个恕我直言太多了.

    <?xml version='1.0' encoding='UTF-8'?>

<!-- =========== FULL CONFIGURATION FILE ================================== -->

<faces-config version="1.2" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd">
    <managed-bean>
        <managed-bean-name>SessionBean1</managed-bean-name>
        <managed-bean-class>egispartnerprofile.SessionBean1</managed-bean-class>
        <managed-bean-scope>session</managed-bean-scope>
    </managed-bean>
    <managed-bean>
        <managed-bean-name>ApplicationBean1</managed-bean-name>
        <managed-bean-class>egispartnerprofile.ApplicationBean1</managed-bean-class>
        <managed-bean-scope>application</managed-bean-scope>
    </managed-bean>
    <managed-bean>
        <managed-bean-name>RequestBean1</managed-bean-name>
        <managed-bean-class>egispartnerprofile.RequestBean1</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>
    <managed-bean>
        <managed-bean-name>Hauptseite</managed-bean-name>
        <managed-bean-class>egispartnerprofile.Hauptseite</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>
    <managed-bean>
        <managed-bean-name>PasswordVergessen</managed-bean-name>
        <managed-bean-class>egispartnerprofile.PasswordVergessen</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>
    <managed-bean>
        <managed-bean-name>registery</managed-bean-name>
        <managed-bean-class>egispartnerprofile.registery</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>
    <managed-bean>
        <managed-bean-name>Page1</managed-bean-name>
        <managed-bean-class>egispartnerprofile.Page1</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>
    <validator>
        <validator-id>login.EmailValidator</validator-id>
        <validator-class>Login.EmailValidator</validator-class>
    </validator>

    <managed-bean>
        <managed-bean-name>Bewertung</managed-bean-name>
        <managed-bean-class>group52.infoholders.Bewertung</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>
    <managed-bean>
        <managed-bean-name>Mitarbeiter</managed-bean-name>
        <managed-bean-class>group52.infoholders.Mitarbeiter</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>
    <managed-bean>
        <managed-bean-name>Nachrichten</managed-bean-name>
        <managed-bean-class>group52.infoholders.Nachrichten</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>
    <managed-bean>
        <managed-bean-name>Benutrzer</managed-bean-name>
        <managed-bean-class>group52.infoholders.Benutzer</managed-bean-class>
        <managed-bean-scope>application</managed-bean-scope>
    </managed-bean>
    <managed-bean>
        <managed-bean-name>view$MainPage</managed-bean-name> …

我有一张桌子:

NACHRICHT_ID | VERFASSER_USERNAME | BETREFF | TEXT |  DATUM    | EMPAENGER_ID
------------------------------------------------------------------------------
             |                    |         |      | 2009-07-01|  
     1       |          h         | hfgh    | hfgh |  23:15:10 |    31
------------------------------------------------------------------------------
             |                    |         |      | 2009-07-02|  
     3       |          h         | hfgh    | hfgh |  00:30:10 |    31
------------------------------------------------------------------------------
             |                    |         |      | 2009-07-02|  
     4       |          q         | hfgh    | hi   |  11:42:06 |    31
------------------------------------------------------------------------------
             |                    |         |      | 2009-07-02|  
     5       |          h         | hfgh    | hfgh |  12:53:56 |    31 …