我刚开始使用bootstrap来转换现有的GWT项目。原始rpc调用适用于以下代码。但是，替换是在原始代码和“连接失败 - 请重试”之后直接放置的。触发时弹出窗口显示在屏幕上。日志中没有任何内容。窗口显示返回正确的值。当我启动引导程序时，我将替换原始代码。
package org.AwardTracker.client;
/**
* The purpose of this View is to allow the account holder
* to login to their account using an Account Name and password.
*/
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.PasswordTextBox;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Document;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.logical.shared.AttachEvent;
import com.google.gwt.event.logical.shared.AttachEvent.Handler;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.ServiceDefTarget;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
public class LoginView extends Composite {
private DBConnectionAsync rpc;
final VerticalPanel verticalPanel = new VerticalPanel();
final HorizontalPanel horizontalPanel = new HorizontalPanel();
final Label lblWelcomeToThe = new Label("Welcome to the Award Tracker login page.\r\n\r\nPlease Sign into your account.");
final FlexTable flexTable = new FlexTable();
final Label lblAccountName = new Label("*Account name:");
final Label lblAccountName2 = new Label("(username (e.g., email))");
final Label lblPassword = new Label("*Password:");
private PasswordTextBox passwordTextBox;
private TextBox textBoxAccountName;
int loginAttempt = 0;
public String youthMemberID = null;
int youthMembersLinked = 0;
public String accountID = null;
public String accountLevel = null;
public String scoutGroup = null;
public String scoutGroupSection = null;
public LoginView() {
verticalPanel.addAttachHandler(new Handler() {
public void onAttachOrDetach(AttachEvent event) {
if (event.isAttached()) {
rpc = (DBConnectionAsync) GWT.create(DBConnection.class);
ServiceDefTarget target = (ServiceDefTarget) rpc;
String moduleRelativeURL = GWT.getModuleBaseURL() + "MySQLConnection";
target.setServiceEntryPoint(moduleRelativeURL);
//Display the login page
//This is the nice green background with the small Scout logo
verticalPanel.setStyleName("gwt-Scout-Background");
verticalPanel.setWidth("100%");
verticalPanel.setHeight("100%");
verticalPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);
verticalPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
verticalPanel.setBorderWidth(0);
//This is the nice green background with the small Scout logo
horizontalPanel.setStyleName("gwt-Scout-Background");
horizontalPanel.setWidth("100%");
horizontalPanel.setHeight("100%");
horizontalPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);
horizontalPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
verticalPanel.add(horizontalPanel);
//Display the welcome message
lblWelcomeToThe.setStyleName("gwt-Label-Login");
verticalPanel.add(lblWelcomeToThe);
lblWelcomeToThe.setWidth("321px");
verticalPanel.add(flexTable);
verticalPanel.setCellHorizontalAlignment(flexTable, HasHorizontalAlignment.ALIGN_CENTER);
//Display the Account Name text and text box
lblAccountName.setStyleName("gwt-Label-Login");
flexTable.setWidget(0, 0, lblAccountName);
//lblAccountName.setSize("110px", "16px");
flexTable.getCellFormatter().setHorizontalAlignment(0, 0, HasHorizontalAlignment.ALIGN_RIGHT);
textBoxAccountName = new TextBox();
flexTable.setWidget(0, 1, textBoxAccountName);
textBoxAccountName.setSize("155px", "20px");
//Display the Account Name hint
lblAccountName2.setStyleName("gwt-Label-Login");
flexTable.setWidget(0, 2, lblAccountName2);
//lblAccountName2.setSize("200px", "16px");
flexTable.getCellFormatter().setHorizontalAlignment(0, 2, HasHorizontalAlignment.ALIGN_LEFT);
//Display the password text and text box.
lblPassword.setStyleName("gwt-Label-Login");
flexTable.setWidget(1, 0, lblPassword);
//lblPassword.setSize("73px", "16px");
flexTable.getCellFormatter().setHorizontalAlignment(1, 0, HasHorizontalAlignment.ALIGN_RIGHT);
passwordTextBox = new PasswordTextBox();
flexTable.setWidget(1, 1, passwordTextBox);
passwordTextBox.setSize("155px", "20px");
//The following code will be replaced when the bootstrap code is working
//Display the sign in button and handle the click event
Button btnSignIn2 = new Button("Sign In");
btnSignIn2.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
//Store whether details have been entered for error handling
//textBoxAccountName.setText("accountName");
Integer tracker = 0;
if (textBoxAccountName.getText().length() == 0) {
tracker = tracker + 1;
}
if (passwordTextBox.getText().length() == 0) {
tracker = tracker + 2;
}
//Check if details have been entered and display an error if
//they have not been entered.
if (tracker == 1) {
textBoxAccountName.setStyleName("gwt-TextBox-Error");
passwordTextBox.setStyleName("gwt-TextBox");
Window.alert("Please enter your Account name.");
}else if (tracker == 2) {
textBoxAccountName.setStyleName("gwt-TextBox");
passwordTextBox.setStyleName("gwt-TextBox-Error");
Window.alert("Please enter your Password.");
}else if (tracker == 3) {
textBoxAccountName.setStyleName("gwt-TextBox-Error");
passwordTextBox.setStyleName("gwt-TextBox-Error");
Window.alert("Please enter your Account name and Password.");
}else {
//If the required details have been entered then search the database for a match
textBoxAccountName.setStyleName("gwt-TextBox");
passwordTextBox.setStyleName("gwt-TextBox");
AsyncCallback<AccountGroup> callback = new AuthenticationHandler<AccountGroup>();
rpc.authenticateAccountGroup(textBoxAccountName.getText(), passwordTextBox.getText(), callback);
}
}
});
flexTable.setWidget(3, 1, btnSignIn2);
//The following code is for bootstrap
RootPanel.get("payPalDonate");
RootPanel.get("payPalDonate").setVisible(true);
RootPanel.get("login"); //From bootstrap
RootPanel.get("login").setVisible(true);
Button btnSignIn = Button.wrap(Document.get().getElementById("submit")); //From bootstrap
final TextBox textBoxAccountName = TextBox.wrap(Document.get().getElementById("accountName")); //From bootstrap
final PasswordTextBox passwordTextBox = PasswordTextBox.wrap(Document.get().getElementById("enterPassword")); //From bootstrap
//Display the sign in button and handle the click event
btnSignIn.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
//Store whether details have been entered for error handling
Integer tracker = 0;
if (textBoxAccountName.getText().length() == 0) {
tracker = tracker + 1;
}
if (passwordTextBox.getText().length() == 0) {
tracker = tracker + 2;
}
//Check if details have been entered and display an error if
//they have not been entered.
if (tracker == 1) {
textBoxAccountName.setStyleName("gwt-TextBox-Error");
passwordTextBox.setStyleName("gwt-TextBox");
Window.alert("Please enter your Account name.");
}else if (tracker == 2) {
textBoxAccountName.setStyleName("gwt-TextBox");
passwordTextBox.setStyleName("gwt-TextBox-Error");
Window.alert("Please enter your Password.");
}else if (tracker == 3) {
textBoxAccountName.setStyleName("gwt-TextBox-Error");
passwordTextBox.setStyleName("gwt-TextBox-Error");
Window.alert("Please enter your Account name and Password.");
}else {
//If the required details have been entered then search the database for a match
textBoxAccountName.setStyleName("gwt-TextBox");
passwordTextBox.setStyleName("gwt-TextBox");
Window.alert("textBoxAccountName.getText() = " + textBoxAccountName.getText());
Window.alert("passwordTextBox.getText() = " + passwordTextBox.getText());
AsyncCallback<AccountGroup> callback = new AuthenticationHandler<AccountGroup>();
rpc.authenticateAccountGroup(textBoxAccountName.getText(), passwordTextBox.getText(), callback);
}
}
});
}
}
});
initWidget(verticalPanel);
}
class AuthenticationHandler<T> implements AsyncCallback<AccountGroup> {
public void onFailure(Throwable ex) {
System.out.println("RPC call failed - AuthenticationHandler - Notify Administrator.");
Window.alert("Connection failed - please retry.");
}
public void onSuccess(AccountGroup result) {
AccountGroup account = result;
if (account == null) {
//Only three invalid login attempts are allowed. Disable the account after
//three invalid login attempts.
if (loginAttempt > 2){
AsyncCallback<Void> callback = new DisableHandler<Void>();
rpc.disableAccount(textBoxAccountName.getText(), 0, callback);
}else{
Window.alert("Incorrect Account name or Password entered. Please try again.");
}
}else{
if (account.getLevel() == null) {
Window.alert("Your account has not yet been set up. Please contact your administrator.");
}else{
if (account.getArchived() != null) {
Window.alert("Your account has been archived. Please contact your administrator.");
}else{
if (account.getEnabled() == 1){
accountLevel = account.getLevel();
accountID = account.getAccountId();
scoutGroup = account.getScoutGroupId();
scoutGroupSection = account.getGroupSection();
//Is a Leader or Administrator.
//Store the LoginView data for use in subsequent Views.
AsyncCallback<ViewData> callback2 = new ViewDataStoreHandler<ViewData>();
rpc.setViewData(account.getAccountId(), account.getLevel(), null, null, null,
scoutGroup, null, 0, scoutGroupSection, null, null, callback2);
}else{
//The account has had three or more invalid passwords entered and has been disabled.
Window.alert("Account is disabled. Please contact your administrator.");
}
}
}
}
}
}
class ViewDataStoreHandler<T> implements AsyncCallback<ViewData> {
public void onFailure(Throwable ex) {
System.out.println("RPC call failed - ViewDataStoreHandler - Notify Administrator.");
Window.alert("Connection failed - please retry.");
}
public void onSuccess(ViewData result) {
//The details have been stored
RootPanel.get("payPalDonate").setVisible(false);
RootPanel.get("payPalDonate").clear();
RootPanel.get("login").setVisible(false);
RootPanel.get("login").clear();
History.newItem("selectPerson", true);
}
}
class DisableHandler<T> implements AsyncCallback<Void> {
public void onFailure(Throwable ex) {
System.out.println("RPC call failed - DisableHandler - Notify Administrator.");
Window.alert("Connection failed - please retry.");
}
public void onSuccess(Void result) {
Window.alert("You have exceeded your password tries and your Account has been disabled. Please contact your administrator.");
}
}
}
我发现在服务器端使用以下方法检查密码时
if (stored_hash == null){
System.out.println("Incorrect account.");
account = null;
}else{
//Check that the hashed value of the password equals the stored hashed value
//If it does not then account will be set to null.
if (BCrypt.checkpw(pass, stored_hash)) {
System.out.println("Success!");
}else{
System.out.println("Incorrect password.");
account = null;
}
}
//Done
return account;
如果帐户不正确（即未使用BCrypt），则不会返回错误。但是，当使用BCrypt时（即，无论密码是否正确，帐户都是正确的），都会返回错误代码（Throwable value = com.google.gwt.user.client.rpc.StatusCodeException：0）
然后我找到了Getting com.google.gwt.user.client.rpc.StatusCodeException: 0 in GWT：
我发现如果你在服务器上挂起一个rpc调用（Thread.wait（））并刷新浏览器然后在客户端再次加载页面之前它会调用等待回调的onFailure方法使用上面提到的状态代码表明它在客户端中是orginates，或者它是非特定捕获异常的通用错误代码。
我的浏览器令人耳目一新！所以现在的问题是如何让它更新鲜？
答案 0 :(得分：0)
经过大量调查后，我发现问题不在于Java代码。当您从gwtBootstrap中的表单返回数据时，如果刷新并返回＆＃34; Throwable value = com.google.gwt.user.client.rpc.StatusCodeException：0＆＃34;这被选为GWTJava中的错误代码。所以不要在HTML中使用表单使用div。完整的解释和解决方案是How to stop GWTBootstrap3 from refreshing and loosing my input and returning an error code