我正在使用 Netbeans 7.2.1 和 GlassFish 3.1。
我使用 JSF、ejb 类和 JDBC 数据源创建了 Web 应用程序。xhtml 页面引用支持托管 bean，它调用 ejb 类上的本地接口函数，这些类通过数据源运行查询，直接获取连接并执行查询。
项目构建成功，但是当我运行项目时，浏览器显示错误“未收到数据”，并且浏览器选项卡标题显示加载失败。我想也许我缺少一些配置，因为当我运行同一个项目而不引用托管 bean（因此不引用 ejb 和数据库）时，没有这样的消息。
坦率地说，我迷失了这样一个项目需要哪些配置文件，以及需要在那里配置什么。我看到了很多解释，每个解释都说别的，我不清楚哪一个是相关的。如果您能指出一些明确的相关解释，我将不胜感激。
我需要在某个数据源的地方为这个项目配置吗？ejb类？还要别的吗？
网页.xml：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 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-app_3_0.xsd">
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>faces/index.xhtml</welcome-file>
</welcome-file-list>
豆类.xml：
<?xml version="1.0" encoding="UTF-8"?>
<beans 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/beans_1_0.xsd">
</beans>
索引.xhtml：
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<h:head>
<title>Movie Tickets Order </title>
</h:head>
<h:body>
<h:panelGrid columns="2" rendered="#{!UserBean.loggedIn}">
<h:outputLabel for="username" value="Username:"></h:outputLabel>
<h:inputText id="username" value="#{UserBean.username}"/>
<h:outputLabel for="password" value="Password: "></h:outputLabel>
<h:inputSecret id="password" value="#{UserBean.password}"/>
</h:panelGrid>
<h:commandButton value="Login" action="#{UserBean.login}" rendered="#{!UserBean.loggedIn}"/>
<h:commandButton value="Logout" action="#{UserBean.logout}" rendered="#{UserBean.loggedIn}"/>
<h:outputLink value="EditMovie" rendered="#{UserBean.isAdmin}"> Add/Edit Movie </h:outputLink>
</h:body>
用户Bean
import TicketsEJB.UserejbLocal;
import javax.inject.Named;
import javax.enterprise.context.SessionScoped;
import java.io.Serializable;
import javax.ejb.EJB;
@Named(value = "UserBean")
@SessionScoped
public class UserBean implements Serializable {
private static final long serialVersionUID = 20130908L;
private String username;
private String password;
private String status;
private boolean exist = false;
private boolean loggedIn = false;
private final String statusAdmin = "admin";
private final String statusUser = "user";
@EJB
UserejbLocal userejb;
public boolean isAdmin() {
return status.equals(statusAdmin);
}
public void setLoggedIn(boolean loggedIn) {
this.loggedIn = loggedIn;
}
public boolean isLoggedIn() {
return loggedIn;
}
public void login() {
status = userejb.getUser(username, password);
exist = (status == null) ? false : true;
if (exist) {
//render "Hello user"
if (status.equals(statusAdmin)) {
loggedIn=true;
//render admin part:
}
} else {
//render "Sorry, wrong credentials"
}
password = null;
}
....
用户rejb类：
@Stateful
@Local(UserejbLocal.class)
public class Userejb implements UserejbLocal {
private Connection connection = null;
private PreparedStatement getUser = null;
private PreparedStatement addUser = null;
private PreparedStatement getUserSalt = null;
private boolean exist;
private String status;
@Resource( name = "jdbc/Movies")
DataSource dataSource;
@PostConstruct
@Override
public void prepareStatements() {
try {
if (dataSource == null) {
throw new SQLException("Unable to obtain DataSource");
}
connection = dataSource.getConnection();
if (connection == null) {
throw new SQLException("Unable to connect to DataSource");
}
try {
getUser = connection.prepareStatement(
"SELECT STATUS "
+ "FROM Users"
+ "WHERE NAMEU= ? and HASHP=?");
addUser = connection.prepareStatement(
"insert into Users values ('?','?','?','?')");
getUserSalt = connection.prepareStatement(
"SELECT SALTP "
+ "FROM Users"
+ "WHERE NAMEU= ? ");
} catch (SQLException sqlException) {
sqlException.printStackTrace();
System.exit(1);
}
} catch (SQLException sqlException) {
sqlException.printStackTrace();
System.exit(1);
}
}
@Override
public void addUser(String name, String password, String status) {
String salt = Security.salt();
try {
addUser.setString(1, name);
addUser.setString(2, Security.hash(password + salt));
addUser.setString(3, salt);
addUser.setString(4, status);
addUser.executeUpdate();
} catch (SQLException ex) {
Logger.getLogger(Userejb.class.getName()).log(Level.SEVERE, null, ex);
}
}
....
UserejbLocal 接口：
public interface UserejbLocal {
void prepareStatements();
void addUser(String name, String password, String status);
public java.lang.String getUser(java.lang.String name, java.lang.String password);
}
谢谢您的帮助！