smartGWT dome add data

1.页面

/*
 * Smart GWT (GWT for SmartClient)
 * Copyright 2008 and beyond, Isomorphic Software, Inc.
 *
 * Smart GWT is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3
 * as published by the Free Software Foundation.  Smart GWT is also
 * available under typical commercial license terms - see
 * http://smartclient.com/license
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 */

import com.smartgwt.client.data.DataSource;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.IButton;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.events.ClickEvent;
import com.smartgwt.client.widgets.events.ClickHandler;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.grid.ListGrid;
import com.smartgwt.client.widgets.layout.VLayout;
import com.smartgwt.sample.showcase.client.data.ItemSupplyLocalDS;

public class GridFormAddSample implements EntryPoint {

    public void onModuleLoad() {

        VLayout layout = new VLayout(15);

        Label label = new Label();
        label.setHeight(10);
        label.setWidth100();
        label.setContents("Showing items in Category 'Rollfix Glue");
        layout.addMember(label);

        final DataSource dataSource = ItemSupplyLocalDS.getInstance();

        ListGrid listGrid = new ListGrid();
        listGrid.setWidth100();
        listGrid.setHeight(200);
        listGrid.setDataSource(dataSource);
        listGrid.setAutoFetchData(true);
        layout.addMember(listGrid);

        final DynamicForm form = new DynamicForm();
        form.setNumCols(4);
        form.setDataSource(dataSource);

        form.setValue("category", "Rollfix Glue");
        form.setValue("itemName", "[Enter Item Name]");
        form.setValue("SKU", "[SKU]");
        form.setValue("unitCoset", "[Enter Price]");

        layout.addMember(form);

        IButton button = new IButton("Save New");
        button.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                form.saveData();
                form.reset();
            }
        });
        layout.addMember(button);

        layout.draw();
    }

}

2.数据交互
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ackage com.smartgwt.sample.showcase.client.data;

import com.smartgwt.client.data.DSRequest;
import com.smartgwt.client.data.DataSource;
import com.smartgwt.client.data.fields.*;
import com.smartgwt.client.widgets.form.validator.FloatPrecisionValidator;
import com.smartgwt.client.widgets.form.validator.FloatRangeValidator;

public class ItemSupplyLocalDS extends DataSource {

    private static ItemSupplyLocalDS instance = null;

    public static ItemSupplyLocalDS getInstance() {
        if (instance == null) {
            instance = new ItemSupplyLocalDS("supplyItemLocalDS");
        }
        return instance;
    }

    public ItemSupplyLocalDS(String id) {

        setID(id);
        DataSourceIntegerField pkField = new DataSourceIntegerField("itemID");
        pkField.setHidden(true);
        pkField.setPrimaryKey(true);

        DataSourceTextField itemNameField = new DataSourceTextField("itemName", "Item Name", 128, true);
        DataSourceTextField skuField = new DataSourceTextField("SKU", "SKU", 10, true);

        DataSourceTextField descriptionField = new DataSourceTextField("description", "Description", 2000);
        DataSourceTextField categoryField = new DataSourceTextField("category", "Category", 128, true);
        categoryField.setForeignKey("supplyCategory.categoryName");

        DataSourceEnumField unitsField = new DataSourceEnumField("units", "Units", 5);
        unitsField.setValueMap("Roll", "Ea", "Pkt", "Set", "Tube", "Pad", "Ream", "Tin", "Bag", "Ctn", "Box");

        DataSourceFloatField unitCostField = new DataSourceFloatField("unitCost", "Unit Cost", 5);
        FloatRangeValidator rangeValidator = new FloatRangeValidator();
        rangeValidator.setMin(0);
        rangeValidator.setErrorMessage("Please enter a valid (positive) cost");

        FloatPrecisionValidator precisionValidator = new FloatPrecisionValidator();
        precisionValidator.setPrecision(2);
        precisionValidator.setErrorMessage("The maximum allowed precision is 2");

        unitCostField.setValidators(rangeValidator, precisionValidator);

        DataSourceBooleanField inStockField = new DataSourceBooleanField("inStock", "In Stock");

        DataSourceDateField nextShipmentField = new DataSourceDateField("nextShipment", "Next Shipment");

        setFields(pkField, itemNameField, skuField, descriptionField, categoryField, unitsField,
                  unitCostField, inStockField, nextShipmentField);

        setClientOnly(true);
        setTestData(ItemData.getRecords());
    }

    protected Object transformRequest(DSRequest dsRequest) {
        return super.transformRequest(dsRequest);
    }
}