我正在遵循这个教程Login，而且我正面临一些困难。 我有一个MYSQL数据库，我创建了一个包含id，用户名和密码的表。 数据库已启动并正在运行。创建了 hibernate.cfg.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.url">jdbc:mysql://localhost:3306/timetable</property>
<property name="connection.username">root</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="connection.password">k771u3</property>
<property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
<property name="current_session_context_class">thread</property>
<!-- this will show us all sql statements -->
<property name="hibernate.show_sql">true</property>
<!-- mapping files -->
<mapping resource="User.hbm.xml" />
</session-factory>
</hibernate-configuration>
User.hbm.xml
<hibernate-mapping>
<class name="com.Logins.client.bean.User" table="username">
<id name="id" column="id" type="int" unsaved-value="null">
<generator class="native"/>
</id>
<property name="username" type="java.lang.String" column="username"/>
<property name="password" type="java.lang.String" column="password"/>
</class>
</hibernate-mapping>
Logins.java 包com.Logins.client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;
import com.Logins.client.bean.User;
import com.Logins.client.screen.HomeScreen;
import com.Logins.client.screen.LoginScreen;
public class Logins implements EntryPoint {
private static Logins singleton;
public static Logins get(){
return singleton;
}
@Override
public void onModuleLoad() {
singleton=this;
setLoginScreen();
}
private void setLoginScreen() {
//Create the Login screen
LoginScreen scrLogin=new LoginScreen();
//Attach it to the root panel
RootPanel.get().add(scrLogin);
}
public void setHomeScreen(User user) {
HomeScreen homeScreen=new HomeScreen(user);
RootPanel.get().clear();
RootPanel.get().add(homeScreen);
}
}
GreetingService.java
package com.Logins.client;
import com.Logins.client.bean.User;
import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
@RemoteServiceRelativePath("greet")
public interface GreetingService extends RemoteService {
public User checkLogin(String userName, String password);
public User isSessionAlive();
void logout();
}
GreetingServiceAsync.java
package com.Logins.client;
import com.Logins.client.bean.User;
import com.google.gwt.user.client.rpc.AsyncCallback;
public interface GreetingServiceAsync {
public void checkLogin(String userName, String password, AsyncCallback callback);
public void isSessionAlive(AsyncCallback callback);
public void logout(AsyncCallback callback);
}
HomeScreen.java
package com.Logins.client.screen;
import com.Logins.client.bean.User;
public class HomeScreen extends Composite{
public HomeScreen(User user) {
VerticalPanel vp=new VerticalPanel();
Label lblWelcome=new Label();
lblWelcome.setText("Hello "+user.getUserName());
vp.add(lblWelcome);
initWidget(vp);
}
}
LoginScreen.java
package com.Logins.client.screen;
import com.Logins.client.GreetingService;
public class LoginScreen extends Composite{
// TextBox for the User Name
private TextBox txtLogin=new TextBox();
// PasswordTextBox for the password
private PasswordTextBox txtPassword=new PasswordTextBox();
//Error Label
private Label lblError=new Label();
public LoginScreen() {
// Lets add a grid to hold all our widgets
Grid grid = new Grid(4, 2);
//Set the error label
grid.setWidget(0,1, lblError);
//Add the Label for the username
grid.setWidget(1,0, new Label("Username"));
//Add the UserName textBox
grid.setWidget(1,1, txtLogin);
//Add the label for password
grid.setWidget(2,0, new Label("Password"));
//Add the password widget
grid.setWidget(2,1, txtPassword);
//Create a button
Button btnLogin=new Button("login");
//Add the Login button to the form
grid.setWidget(3,1, btnLogin );
/*Add a click listener which is called
when the button is clicked */
btnLogin.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
checkLogin(txtLogin.getText(),txtPassword.getText());
}
});
initWidget(grid);
}
/*
* This method is called when the button is clicked
*/
private void checkLogin(String userName,String password) {
System.out.println("Checking login for "+userName);
/**
* Async call to the server to check for login
*/
AsyncCallback callback = new AsyncCallback() {
public void onSuccess(Object result) {
User user = (User) result;
if (user != null) {
setErrorText("");
// The user is authenticated, Set the home screen
Logins.get().setHomeScreen(user);
} else {
setErrorText("Invalid UserName or Password");
}
}
public void onFailure(Throwable ex) {
setErrorText("Error "+ex.getMessage());
}
};
getService().checkLogin(userName, password,callback);
}
private void setErrorText(String errorMessage) {
lblError.setText(errorMessage);
}
private GreetingServiceAsync getService() {
GreetingServiceAsync svc = (GreetingServiceAsync) GWT
.create(GreetingService.class);
ServiceDefTarget endpoint = (ServiceDefTarget) svc;
endpoint.setServiceEntryPoint(GWT.getModuleBaseURL() + "/GreetingService");
return svc;
}
}
GreetingServiceImpl.java
package com.Logins.server;
import javax.servlet.http.HttpSession;
import com.Logins.client.GreetingService;
import com.Logins.client.bean.User;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
public class GreetingServiceImpl extends RemoteServiceServlet implements
GreetingService {
private static final String USER_SESSION = "GWTAppUser";
private static final long serialVersionUID = 1;
private void setUserInSession(User user) {
HttpSession session = getThreadLocalRequest().getSession();
session.setAttribute(USER_SESSION, user);
}
private User getUserFromSession() {
HttpSession session = getThreadLocalRequest().getSession();
return (User) session.getAttribute(USER_SESSION);
}
public User checkLogin(String userName, String password) {
if (userName.equalsIgnoreCase("gwt")) {
User user = new User();
user.setUserName(userName);
setUserInSession(user);
return user;
} else
return null;
}
@Override
public void logout() {
HttpSession session = getThreadLocalRequest().getSession();
if (session != null)
session.invalidate();
}
@Override
public User isSessionAlive() {
User bean = getUserFromSession();
if ((bean != null) && (bean.getUserName().length() != 0)) {
System.out.println("User " + bean.getUserName()
+ " is already logged in");
return bean;
}
return null;
}
}
的HibernateUtil
package util;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
// Create the SessionFactory from hibernate.cfg.xml
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
User.java
package com.Logins.client.bean;
import java.io.Serializable;
public class User implements Serializable{
/**
* Add this variable for serialization
*/
private static final long serialVersionUID = 1L;
private String userName;
private String password;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
当我'运行为Web应用程序'出现html表单时，但当我输入凭据，用户和密码时，会收到此错误：
错误404 html head meta http-equiv =“Content-Type”content =“text / html; charset = ISO-8859-1”/ titleError 404 NOT_FOUND / title / head bodyh2HTTP错误：404 / h2preNOT_FOUND / pre pRequestURI = / logins // GreetingService / ppismalla href =“http://jetty.mortbay.org/”由Jetty提供支持：/// a / small / i / pbr / br / br / br / br / br / br / br / br / br / br / br / br / br / br / br / br / br / br / br / / body / html
如果有人可以帮我弄清楚哪些是错的或者还有什么可以实施，那将非常高兴。这对我来说非常重要。感谢
控制台错误：
Reloading web app to reflect changes in C:\Users\Martinho\Documents\SpringWorkSpace\Logins\war
[WARN] Server class 'com.google.gwt.dev.shell.jetty.JDBCUnloader' could not be found in the web app, but was found on the system classpath
[WARN] Adding classpath entry 'file:/C:/springsource/sts-2.6.0.RELEASE/plugins/com.google.gwt.eclipse.sdkbundle_2.2.0.v201103311225/gwt-2.2.0/gwt-dev.jar' to the web app classpath for this session
For additional info see: file:/C:/springsource/sts-2.6.0.RELEASE/plugins/com.google.gwt.eclipse.sdkbundle_2.2.0.v201103311225/gwt-2.2.0/doc/helpInfo/webAppClassPath.html
Reload completed successfully
Checking login for
[WARN] 404 - POST /logins//GreetingService (127.0.0.1) 1409 bytes
Request headers
Host: 127.0.0.1:8888
Connection: keep-alive
Referer: http://127.0.0.1:8888/Logins.html?gwt.codesvr=127.0.0.1:9997
Content-Length: 161
Origin: http://127.0.0.1:8888
X-GWT-Module-Base: http://127.0.0.1:8888/logins/
X-GWT-Permutation: HostedMode
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.0 Safari/534.30
Content-Type: text/x-gwt-rpc; charset=UTF-8
Accept: */*
Accept-Encoding: gzip,deflate,sdch
Accept-Language: pt-PT,pt;q=0.8,en-US;q=0.6,en;q=0.4
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Response headers
Content-Type: text/html; charset=iso-8859-1
Content-Length: 1409
答案 0 :(得分：0)
您是否在web.xml中注册了服务？它应该包含类似
的内容<web-app version="2.5" 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/javaeeweb-app_2_5.xsd">
<servlet>
<servlet-name>greet</servlet-name>
<servlet-class>com.Logins.server.GreetingServiceImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>greet</servlet-name>
<url-pattern>/greet</url-pattern>
</servlet-mapping>
</web-app>