在客户端,我向服务器端发出调用,以获取数据库中的名称列表。当此列表返回到客户端时,我会在 TabPanel 中显示每个名称。当显示每个名称时,我向服务器端发出调用,以从服务器端的数据库中获取该名称的地址列表(这样我就可以更新和添加)。返回地址列表后,我将它们添加到 DisclosurePanel 内的 FlexTable 中。
所以我有一个包含名称的 TabPanel 和一个包含关联地址的 DisclosurePanel。
问题是我无法在 DisclosurePanel 方法中调用数据库来获取正确的地址。
代码是:
private DisclosurePanel addressDisclosurePanel(String nameId) {
DisclosurePanel addressDisclosurePanel = new DisclosurePanel("Address");
//Get the Addresses
AsyncCallback<List<Address>> callback = new GetAddressHandler<List<Address>>();
rpc.getAddressList(nameId, callback);
class GetAddressHandler<T> implements AsyncCallback<List<Address>> {
//Get the list of Addresses.
PersonalDetailsView view;
public GetAddressHandler(PersonalDetailsView view) {
this.view = view;
}
public void onFailure(Throwable ex) {
System.out.println("RPC call failed - GetAddressHandler - Notify Administrator.");
Window.alert("Connection failed - please retry.");
}
public void onSuccess(List<Address> result) {
view.renderAddresses(result);
}
}
public void renderAddresses(List<Address> addressList) {
//Load each TabPanel with Addresses
final FlexTable flexTableAddress = new FlexTable();
if (addressList == null || addressList.isEmpty()) {
//Add a place to add an address
//Address Type
final Label lblAddressType = new Label("Address Type:");
lblAddressType.setStyleName("gwt-Label-Login");
flexTableAddress.setWidget(0, 0, lblAddressType);
final TextBox textBoxAddressType = new TextBox();
textBoxAddressType.setStyleName("gwt-TextBox");
textBoxAddressType.setWidth("300px");
flexTableAddress.setWidget(0, 1, textBoxAddressType);
addressDisclosurePanel.add(flexTableAddress);
}else{
int row = 0;
//
//Create a place to display each Address and allow update
//
for (final Address eachAddress : addressList) {
//Store key
final String addId = eachAddress.getAddId();
//Address Type
final Label lblAddressType = new Label("Address Type:");
lblAddressType.setStyleName("gwt-Label-Login");
flexTableAddress.setWidget(row, 0, lblAddressType);
final TextBox textBoxAddressType = new TextBox();
textBoxAddressType.setText(eachAddress.getAddType());
textBoxAddressType.setStyleName("gwt-TextBox");
textBoxAddressType.setWidth("300px");
flexTableAddress.setWidget(row, 1, textBoxAddressType);
row++;
}
addressDisclosurePanel.add(flexTableAddress);
}
}
return addressDisclosurePanel;
}
错误上线:
view.renderAddresses(result);
错误消息是“PersonalDetailsView 类型的 renderAddresses(List) 方法未定义”。
上线:
public void renderAddresses(List<Address> addressList) {
错误消息是“此行有多个标记 - 标记“)”上的语法错误,;预期的 - 标记“(”上的语法错误;预期 - void 是变量的无效类型 渲染地址”
我做了这个改变:
private DisclosurePanel addressDisclosurePanel(String nameId) {
final DisclosurePanel addressDisclosurePanel = new DisclosurePanel("Address");
//Get the Addresses
AsyncCallback<List<Address>> callback = new GetAddressHandler<List<Address>>(PersonalDetailsView.this);
rpc.getAddressList(nameId, callback);
//addressDisclosurePanel.add(addressHorizontalPanel);
return addressDisclosurePanel;
}
class GetAddressHandler<T> implements AsyncCallback<List<Address>> {
//Get the list of Addresses.
PersonalDetailsView view;
final HorizontalPanel addressHorizontalPanel = new HorizontalPanel();
public GetAddressHandler(PersonalDetailsView view) {
this.view = view;
}
public void onFailure(Throwable ex) {
System.out.println("RPC call failed - GetAddressHandler - Notify Administrator.");
Window.alert("Connection failed - please retry.");
}
public void onSuccess(List<Address> result) {
Window.alert("Render address.");
addressHorizontalPanel.add(view.renderAddresses(result));
}
}
private FlexTable renderAddresses(List<Address> addressList) {
//Load each TabPanel with Addresses
Window.alert("get address.");;
final FlexTable flexTableAddress = new FlexTable();
if (addressList == null || addressList.isEmpty()) {
//Add a place to add an address
//Address Type
final Label lblAddressType = new Label("Address Type:");
lblAddressType.setStyleName("gwt-Label-Login");
flexTableAddress.setWidget(0, 0, lblAddressType);
final TextBox textBoxAddressType = new TextBox();
textBoxAddressType.setStyleName("gwt-TextBox");
textBoxAddressType.setWidth("300px");
flexTableAddress.setWidget(0, 1, textBoxAddressType);
}else{
int row = 0;
//
//Create a place to display each Address and allow update
//
for (final Address eachAddress : addressList) {
//Store key
final String addId = eachAddress.getAddId();
Window.alert("addId = " + addId);
//Address Type
final Label lblAddressType = new Label("Address Type:");
lblAddressType.setStyleName("gwt-Label-Login");
flexTableAddress.setWidget(row, 0, lblAddressType);
final TextBox textBoxAddressType = new TextBox();
textBoxAddressType.setText(eachAddress.getAddType());
textBoxAddressType.setStyleName("gwt-TextBox");
textBoxAddressType.setWidth("300px");
flexTableAddress.setWidget(row, 1, textBoxAddressType);
row++;
}
}
return flexTableAddress;
}
那么我如何返回地址:
class GetAddressHandler<T> implements AsyncCallback<List<Address>> {
到披露面板?
最佳答案
您不能在方法内声明类。所以改变:
//Get the Addresses
AsyncCallback<List<Address>> callback = new GetAddressHandler<List<Address>>();
rpc.getAddressList(nameId, callback);
class GetAddressHandler<T> implements AsyncCallback<List<Address>> {
//Get the list of Addresses.
PersonalDetailsView view;
public GetAddressHandler(PersonalDetailsView view) {
this.view = view;
}
public void onFailure(Throwable ex) {
System.out.println("RPC call failed - GetAddressHandler - Notify Administrator.");
Window.alert("Connection failed - please retry.");
}
public void onSuccess(List<Address> result) {
view.renderAddresses(result);
}
}
至:
//Get the Addresses
AsyncCallback<List<Address>> callback = new AsyncCallback<List<Address>> {
//Get the list of Addresses.
PersonalDetailsView view;
public GetAddressHandler(PersonalDetailsView view) {
this.view = view;
}
public void onFailure(Throwable ex) {
System.out.println("RPC call failed - GetAddressHandler - Notify Administrator.");
Window.alert("Connection failed - please retry.");
}
public void onSuccess(List<Address> result) {
view.renderAddresses(result);
}
}
rpc.getAddressList(nameId, callback);
希望我的编辑中没有语法错误;)
关于java - 方法内出现 AsyncCallback 的 GWT Java 错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38764221/