GWT 简单实例,包括添加/删除/修改/查询数据

package dating.client.dialog; import com.google.gwt.core.client.GWT; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.user.client.DOM; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.*; import dating.client.AsyncCallback; import dating.client.DatingService; import dating.client.DatingServiceAsync; import dating.client.bean.Member; import dating.client.dialog.reg.RegisterPanel; import dating.client.dialog.reg.SubmitEvent; import dating.client.dialog.reg.SubmitHandler; import java.util.List; import java.util.Set; public class DatingPanel extends FlowPanel { private FlowPanel toolBarPanel; private FlowPanel contentPanel; private TextBox searchBox; private Button searchButton; private Button addMemberButton; private Grid membersGrid; private RegisterPanel registerPanel; private DatingServiceAsync service; final DatingPanel me; public DatingPanel() { init(); me = this; service = DatingService.App.getInstance(); addMemberButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { registerPanel.convertRegsiter(); registerPanel.reset(); registerPanel.setModal(true); registerPanel.show(); } }); searchButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { onload(searchBox.getText()); } }); registerPanel.addSubmitHandler(new SubmitHandler() { public void onSubmit(SubmitEvent event) { String userName = registerPanel.getUserName(); String userPwd = registerPanel.getPassword(); String email = registerPanel.getEmail(); if (registerPanel.isReg()) { service.regsiter(new Member(userName, userPwd, email), new AsyncCallback<Boolean>() { public void onSuccess(Boolean result) { if (result) { registerPanel.hide(); } onload(""); } }); } else { service.modify(new Member(userName, userPwd, email), new AsyncCallback<Boolean>() { public void onSuccess(Boolean result) { if (result) { registerPanel.hide(); onload(""); } } }); } } }); } private void init() { setSize("600px", "400px"); toolBarPanel = new FlowPanel(); contentPanel = new FlowPanel(); searchBox = new TextBox(); searchButton = new Button("Search"); addMemberButton = new Button("Add Member"); membersGrid = new Grid(1, 5); membersGrid.setBorderWidth(1); Label userNameLabel = new Label("UserName"); Label passwordLabel = new Label("Password"); Label emailLabel = new Label("Email"); Label modifyLabel = new Label("Modify"); Label delLabel = new Label("Delete"); DOM.setStyleAttribute(userNameLabel.getElement(), "fontWeight", "bold"); DOM.setStyleAttribute(passwordLabel.getElement(), "fontWeight", "bold"); DOM.setStyleAttribute(emailLabel.getElement(), "fontWeight", "bold"); DOM.setStyleAttribute(modifyLabel.getElement(), "fontWeight", "bold"); DOM.setStyleAttribute(delLabel.getElement(), "fontWeight", "bold"); membersGrid.setWidget(0, 0, userNameLabel); membersGrid.setWidget(0, 1, passwordLabel); membersGrid.setWidget(0, 2, emailLabel); membersGrid.setWidget(0, 3, modifyLabel); membersGrid.setWidget(0, 4, delLabel); registerPanel = new RegisterPanel(); registerPanel.setSize("300px", "200px"); toolBarPanel.add(searchBox); toolBarPanel.add(searchButton); toolBarPanel.add(addMemberButton); toolBarPanel.setWidth("100%"); add(toolBarPanel); membersGrid.setWidth("100%"); contentPanel.setWidth("100%"); contentPanel.setHeight("100%"); contentPanel.add(membersGrid); add(contentPanel); } private void onload(String keyword) { if (keyword == null) keyword = ""; service = GWT.create(DatingService.class); service.search(keyword, new AsyncCallback<Set<Member>>() { public void onSuccess(Set<Member> result) { clearCell(); for (Member member : result) { addMember(member); } } }); } private void clearCell() { int rowCount = membersGrid.getRowCount(); while (rowCount > 1) { membersGrid.removeRow(--rowCount); } } private void addMember(Member member) { int row = membersGrid.insertRow(membersGrid.getRowCount()); membersGrid.setWidget(row, 0, new Label(member.getUserName())); membersGrid.setWidget(row, 1, new Label(member.getUserPwd())); membersGrid.setWidget(row, 2, new Label(member.getEmail())); Button modifyButton = new Button("Modify"); final String userName = member.getUserName(); final String userPwd = member.getUserPwd(); final String email = member.getEmail(); modifyButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { registerPanel.reset(); registerPanel.convertModify(userName); registerPanel.setUserPwd(userPwd); registerPanel.setEmail(email); registerPanel.setModal(true); registerPanel.show(); } }); membersGrid.setWidget(row, 3, modifyButton); Button delButton = new Button("Delete"); delButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { service.delete(userName, new AsyncCallback<Void>() { public void onSuccess(Void result) { onload(""); } }); } }); membersGrid.setWidget(row, 4, delButton); } }